/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkSLGLSLCodeGenerator.h"
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#include "SkSLCompiler.h"
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#include "ir/SkSLExpressionStatement.h"
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#include "ir/SkSLExtension.h"
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#include "ir/SkSLIndexExpression.h"
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#include "ir/SkSLModifiersDeclaration.h"
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#include "ir/SkSLNop.h"
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#include "ir/SkSLVariableReference.h"
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#ifndef SKSL_STANDALONE
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#include "SkOnce.h"
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#endif
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namespace SkSL {
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void GLSLCodeGenerator::write(const char* s) {
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if (s[0] == 0) {
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return;
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}
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if (fAtLineStart) {
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for (int i = 0; i < fIndentation; i++) {
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fOut->writeText(" ");
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}
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}
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fOut->writeText(s);
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fAtLineStart = false;
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}
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void GLSLCodeGenerator::writeLine(const char* s) {
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this->write(s);
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fOut->writeText(fLineEnding);
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fAtLineStart = true;
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}
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void GLSLCodeGenerator::write(const String& s) {
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this->write(s.c_str());
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}
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void GLSLCodeGenerator::write(StringFragment s) {
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if (!s.fLength) {
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return;
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}
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if (fAtLineStart) {
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for (int i = 0; i < fIndentation; i++) {
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fOut->writeText(" ");
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}
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}
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fOut->write(s.fChars, s.fLength);
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fAtLineStart = false;
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}
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void GLSLCodeGenerator::writeLine(const String& s) {
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this->writeLine(s.c_str());
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}
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void GLSLCodeGenerator::writeLine() {
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this->writeLine("");
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}
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void GLSLCodeGenerator::writeExtension(const String& name) {
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this->writeExtension(name, true);
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}
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void GLSLCodeGenerator::writeExtension(const String& name, bool require) {
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fExtensions.writeText("#extension ");
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fExtensions.write(name.c_str(), name.length());
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fExtensions.writeText(require ? " : require\n" : " : enable\n");
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}
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bool GLSLCodeGenerator::usesPrecisionModifiers() const {
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return fProgram.fSettings.fCaps->usesPrecisionModifiers();
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}
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String GLSLCodeGenerator::getTypeName(const Type& type) {
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switch (type.kind()) {
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case Type::kVector_Kind: {
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Type component = type.componentType();
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String result;
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if (component == *fContext.fFloat_Type || component == *fContext.fHalf_Type) {
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result = "vec";
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}
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else if (component == *fContext.fDouble_Type) {
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result = "dvec";
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}
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else if (component.isSigned()) {
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result = "ivec";
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}
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else if (component.isUnsigned()) {
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result = "uvec";
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}
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else if (component == *fContext.fBool_Type) {
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result = "bvec";
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}
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else {
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ABORT("unsupported vector type");
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}
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result += to_string(type.columns());
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return result;
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}
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case Type::kMatrix_Kind: {
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String result;
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Type component = type.componentType();
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if (component == *fContext.fFloat_Type || component == *fContext.fHalf_Type) {
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result = "mat";
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}
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else if (component == *fContext.fDouble_Type) {
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result = "dmat";
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}
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else {
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ABORT("unsupported matrix type");
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}
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result += to_string(type.columns());
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if (type.columns() != type.rows()) {
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result += "x";
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result += to_string(type.rows());
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}
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return result;
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}
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case Type::kArray_Kind: {
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String result = this->getTypeName(type.componentType()) + "[";
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if (type.columns() != -1) {
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result += to_string(type.columns());
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}
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result += "]";
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return result;
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}
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case Type::kScalar_Kind: {
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if (type == *fContext.fHalf_Type) {
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return "float";
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}
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else if (type == *fContext.fShort_Type) {
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return "int";
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}
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else if (type == *fContext.fUShort_Type) {
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return "uint";
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}
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else if (type == *fContext.fByte_Type) {
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return "int";
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}
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else if (type == *fContext.fUByte_Type) {
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return "uint";
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}
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else {
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return type.name();
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}
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break;
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}
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default:
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return type.name();
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}
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}
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void GLSLCodeGenerator::writeType(const Type& type) {
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if (type.kind() == Type::kStruct_Kind) {
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for (const Type* search : fWrittenStructs) {
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if (*search == type) {
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// already written
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this->write(type.fName);
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return;
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}
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}
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fWrittenStructs.push_back(&type);
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this->write("struct ");
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this->write(type.fName);
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this->writeLine(" {");
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fIndentation++;
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for (const auto& f : type.fields()) {
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this->writeModifiers(f.fModifiers, false);
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this->writeTypePrecision(*f.fType);
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// sizes (which must be static in structs) are part of the type name here
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this->writeType(*f.fType);
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this->write(" ");
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this->write(f.fName);
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this->writeLine(";");
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}
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fIndentation--;
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this->write("}");
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} else {
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this->write(this->getTypeName(type));
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}
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}
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void GLSLCodeGenerator::writeExpression(const Expression& expr, Precedence parentPrecedence) {
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switch (expr.fKind) {
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case Expression::kBinary_Kind:
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this->writeBinaryExpression((BinaryExpression&) expr, parentPrecedence);
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break;
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case Expression::kBoolLiteral_Kind:
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this->writeBoolLiteral((BoolLiteral&) expr);
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break;
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case Expression::kConstructor_Kind:
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this->writeConstructor((Constructor&) expr, parentPrecedence);
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break;
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case Expression::kIntLiteral_Kind:
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this->writeIntLiteral((IntLiteral&) expr);
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break;
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case Expression::kFieldAccess_Kind:
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this->writeFieldAccess(((FieldAccess&) expr));
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break;
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case Expression::kFloatLiteral_Kind:
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this->writeFloatLiteral(((FloatLiteral&) expr));
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break;
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case Expression::kFunctionCall_Kind:
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this->writeFunctionCall((FunctionCall&) expr);
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break;
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case Expression::kPrefix_Kind:
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this->writePrefixExpression((PrefixExpression&) expr, parentPrecedence);
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break;
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case Expression::kPostfix_Kind:
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this->writePostfixExpression((PostfixExpression&) expr, parentPrecedence);
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break;
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case Expression::kSetting_Kind:
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this->writeSetting((Setting&) expr);
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break;
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case Expression::kSwizzle_Kind:
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this->writeSwizzle((Swizzle&) expr);
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break;
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case Expression::kVariableReference_Kind:
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this->writeVariableReference((VariableReference&) expr);
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break;
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case Expression::kTernary_Kind:
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this->writeTernaryExpression((TernaryExpression&) expr, parentPrecedence);
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break;
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case Expression::kIndex_Kind:
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this->writeIndexExpression((IndexExpression&) expr);
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break;
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default:
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ABORT("unsupported expression: %s", expr.description().c_str());
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}
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}
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static bool is_abs(Expression& expr) {
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if (expr.fKind != Expression::kFunctionCall_Kind) {
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return false;
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}
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return ((FunctionCall&) expr).fFunction.fName == "abs";
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}
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// turns min(abs(x), y) into ((tmpVar1 = abs(x)) < (tmpVar2 = y) ? tmpVar1 : tmpVar2) to avoid a
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// Tegra3 compiler bug.
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void GLSLCodeGenerator::writeMinAbsHack(Expression& absExpr, Expression& otherExpr) {
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SkASSERT(!fProgram.fSettings.fCaps->canUseMinAndAbsTogether());
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String tmpVar1 = "minAbsHackVar" + to_string(fVarCount++);
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String tmpVar2 = "minAbsHackVar" + to_string(fVarCount++);
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this->fFunctionHeader += String(" ") + this->getTypePrecision(absExpr.fType) +
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this->getTypeName(absExpr.fType) + " " + tmpVar1 + ";\n";
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this->fFunctionHeader += String(" ") + this->getTypePrecision(otherExpr.fType) +
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this->getTypeName(otherExpr.fType) + " " + tmpVar2 + ";\n";
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this->write("((" + tmpVar1 + " = ");
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this->writeExpression(absExpr, kTopLevel_Precedence);
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this->write(") < (" + tmpVar2 + " = ");
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this->writeExpression(otherExpr, kAssignment_Precedence);
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this->write(") ? " + tmpVar1 + " : " + tmpVar2 + ")");
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}
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void GLSLCodeGenerator::writeInverseSqrtHack(const Expression& x) {
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this->write("(1.0 / sqrt(");
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this->writeExpression(x, kTopLevel_Precedence);
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this->write("))");
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}
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void GLSLCodeGenerator::writeDeterminantHack(const Expression& mat) {
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String name;
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if (mat.fType == *fContext.fFloat2x2_Type || mat.fType == *fContext.fHalf2x2_Type) {
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name = "_determinant2";
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if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) {
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fWrittenIntrinsics.insert(name);
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fExtraFunctions.writeText((
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"float " + name + "(mat2 m) {"
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" return m[0][0] * m[1][1] - m[0][1] * m[1][0];"
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"}"
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).c_str());
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}
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}
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else if (mat.fType == *fContext.fFloat3x3_Type || mat.fType == *fContext.fHalf3x3_Type) {
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name = "_determinant3";
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if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) {
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fWrittenIntrinsics.insert(name);
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fExtraFunctions.writeText((
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"float " + name + "(mat3 m) {"
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" float a00 = m[0][0], a01 = m[0][1], a02 = m[0][2];"
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" float a10 = m[1][0], a11 = m[1][1], a12 = m[1][2];"
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" float a20 = m[2][0], a21 = m[2][1], a22 = m[2][2];"
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" float b01 = a22 * a11 - a12 * a21;"
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" float b11 = -a22 * a10 + a12 * a20;"
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" float b21 = a21 * a10 - a11 * a20;"
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" return a00 * b01 + a01 * b11 + a02 * b21;"
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"}"
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).c_str());
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}
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}
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else if (mat.fType == *fContext.fFloat4x4_Type || mat.fType == *fContext.fHalf4x4_Type) {
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name = "_determinant3";
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if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) {
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fWrittenIntrinsics.insert(name);
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fExtraFunctions.writeText((
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"mat4 " + name + "(mat4 m) {"
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" float a00 = m[0][0], a01 = m[0][1], a02 = m[0][2], a03 = m[0][3];"
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" float a10 = m[1][0], a11 = m[1][1], a12 = m[1][2], a13 = m[1][3];"
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" float a20 = m[2][0], a21 = m[2][1], a22 = m[2][2], a23 = m[2][3];"
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" float a30 = m[3][0], a31 = m[3][1], a32 = m[3][2], a33 = m[3][3];"
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" float b00 = a00 * a11 - a01 * a10;"
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" float b01 = a00 * a12 - a02 * a10;"
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" float b02 = a00 * a13 - a03 * a10;"
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" float b03 = a01 * a12 - a02 * a11;"
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" float b04 = a01 * a13 - a03 * a11;"
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" float b05 = a02 * a13 - a03 * a12;"
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" float b06 = a20 * a31 - a21 * a30;"
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" float b07 = a20 * a32 - a22 * a30;"
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" float b08 = a20 * a33 - a23 * a30;"
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" float b09 = a21 * a32 - a22 * a31;"
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" float b10 = a21 * a33 - a23 * a31;"
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" float b11 = a22 * a33 - a23 * a32;"
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" return b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06;"
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"}"
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).c_str());
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}
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}
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else {
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SkASSERT(false);
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}
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this->write(name + "(");
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this->writeExpression(mat, kTopLevel_Precedence);
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this->write(")");
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}
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void GLSLCodeGenerator::writeInverseHack(const Expression& mat) {
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String name;
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if (mat.fType == *fContext.fFloat2x2_Type || mat.fType == *fContext.fHalf2x2_Type) {
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name = "_inverse2";
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if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) {
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fWrittenIntrinsics.insert(name);
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fExtraFunctions.writeText((
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"mat2 " + name + "(mat2 m) {"
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" return mat2(m[1][1], -m[0][1], -m[1][0], m[0][0]) / "
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"(m[0][0] * m[1][1] - m[0][1] * m[1][0]);"
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"}"
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).c_str());
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}
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}
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else if (mat.fType == *fContext.fFloat3x3_Type || mat.fType == *fContext.fHalf3x3_Type) {
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name = "_inverse3";
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if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) {
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fWrittenIntrinsics.insert(name);
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fExtraFunctions.writeText((
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"mat3 " + name + "(mat3 m) {"
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" float a00 = m[0][0], a01 = m[0][1], a02 = m[0][2];"
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" float a10 = m[1][0], a11 = m[1][1], a12 = m[1][2];"
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" float a20 = m[2][0], a21 = m[2][1], a22 = m[2][2];"
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" float b01 = a22 * a11 - a12 * a21;"
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" float b11 = -a22 * a10 + a12 * a20;"
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" float b21 = a21 * a10 - a11 * a20;"
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" float det = a00 * b01 + a01 * b11 + a02 * b21;"
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" return mat3(b01, (-a22 * a01 + a02 * a21), (a12 * a01 - a02 * a11),"
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" b11, (a22 * a00 - a02 * a20), (-a12 * a00 + a02 * a10),"
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" b21, (-a21 * a00 + a01 * a20), (a11 * a00 - a01 * a10)) / det;"
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"}"
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).c_str());
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}
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}
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else if (mat.fType == *fContext.fFloat4x4_Type || mat.fType == *fContext.fHalf4x4_Type) {
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name = "_inverse4";
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if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) {
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fWrittenIntrinsics.insert(name);
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fExtraFunctions.writeText((
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"mat4 " + name + "(mat4 m) {"
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" float a00 = m[0][0], a01 = m[0][1], a02 = m[0][2], a03 = m[0][3];"
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" float a10 = m[1][0], a11 = m[1][1], a12 = m[1][2], a13 = m[1][3];"
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" float a20 = m[2][0], a21 = m[2][1], a22 = m[2][2], a23 = m[2][3];"
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" float a30 = m[3][0], a31 = m[3][1], a32 = m[3][2], a33 = m[3][3];"
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" float b00 = a00 * a11 - a01 * a10;"
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" float b01 = a00 * a12 - a02 * a10;"
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" float b02 = a00 * a13 - a03 * a10;"
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" float b03 = a01 * a12 - a02 * a11;"
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" float b04 = a01 * a13 - a03 * a11;"
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" float b05 = a02 * a13 - a03 * a12;"
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" float b06 = a20 * a31 - a21 * a30;"
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" float b07 = a20 * a32 - a22 * a30;"
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" float b08 = a20 * a33 - a23 * a30;"
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" float b09 = a21 * a32 - a22 * a31;"
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" float b10 = a21 * a33 - a23 * a31;"
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" float b11 = a22 * a33 - a23 * a32;"
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" float det = b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - "
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" b04 * b07 + b05 * b06;"
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" return mat4("
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" a11 * b11 - a12 * b10 + a13 * b09,"
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" a02 * b10 - a01 * b11 - a03 * b09,"
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" a31 * b05 - a32 * b04 + a33 * b03,"
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" a22 * b04 - a21 * b05 - a23 * b03,"
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" a12 * b08 - a10 * b11 - a13 * b07,"
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" a00 * b11 - a02 * b08 + a03 * b07,"
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" a32 * b02 - a30 * b05 - a33 * b01,"
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" a20 * b05 - a22 * b02 + a23 * b01,"
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" a10 * b10 - a11 * b08 + a13 * b06,"
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" a01 * b08 - a00 * b10 - a03 * b06,"
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" a30 * b04 - a31 * b02 + a33 * b00,"
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" a21 * b02 - a20 * b04 - a23 * b00,"
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" a11 * b07 - a10 * b09 - a12 * b06,"
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" a00 * b09 - a01 * b07 + a02 * b06,"
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" a31 * b01 - a30 * b03 - a32 * b00,"
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" a20 * b03 - a21 * b01 + a22 * b00) / det;"
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"}"
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).c_str());
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}
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}
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else {
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SkASSERT(false);
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}
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this->write(name + "(");
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this->writeExpression(mat, kTopLevel_Precedence);
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this->write(")");
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}
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void GLSLCodeGenerator::writeTransposeHack(const Expression& mat) {
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String name = "transpose" + to_string(mat.fType.columns()) + to_string(mat.fType.rows());
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if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) {
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fWrittenIntrinsics.insert(name);
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String type = this->getTypeName(mat.fType);
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const Type& base = mat.fType.componentType();
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String transposed = this->getTypeName(base.toCompound(fContext,
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mat.fType.rows(),
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mat.fType.columns()));
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fExtraFunctions.writeText((transposed + " " + name + "(" + type + " m) {\nreturn " +
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transposed + "(").c_str());
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const char* separator = "";
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for (int row = 0; row < mat.fType.rows(); ++row) {
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for (int column = 0; column < mat.fType.columns(); ++column) {
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fExtraFunctions.writeText(separator);
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fExtraFunctions.writeText(("m[" + to_string(column) + "][" + to_string(row) +
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"]").c_str());
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separator = ", ";
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}
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}
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fExtraFunctions.writeText("); }");
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}
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this->write(name + "(");
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this->writeExpression(mat, kTopLevel_Precedence);
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this->write(")");
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}
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std::unordered_map<StringFragment, GLSLCodeGenerator::FunctionClass>*
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GLSLCodeGenerator::fFunctionClasses = nullptr;
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void GLSLCodeGenerator::writeFunctionCall(const FunctionCall& c) {
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#ifdef SKSL_STANDALONE
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if (!fFunctionClasses) {
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#else
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static SkOnce once;
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once([] {
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#endif
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fFunctionClasses = new std::unordered_map<StringFragment, FunctionClass>();
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(*fFunctionClasses)["abs"] = FunctionClass::kAbs;
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(*fFunctionClasses)["atan"] = FunctionClass::kAtan;
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(*fFunctionClasses)["determinant"] = FunctionClass::kDeterminant;
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(*fFunctionClasses)["dFdx"] = FunctionClass::kDFdx;
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(*fFunctionClasses)["dFdy"] = FunctionClass::kDFdy;
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(*fFunctionClasses)["fwidth"] = FunctionClass::kFwidth;
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(*fFunctionClasses)["fma"] = FunctionClass::kFMA;
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(*fFunctionClasses)["fract"] = FunctionClass::kFract;
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(*fFunctionClasses)["inverse"] = FunctionClass::kInverse;
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(*fFunctionClasses)["inverseSqrt"] = FunctionClass::kInverseSqrt;
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(*fFunctionClasses)["min"] = FunctionClass::kMin;
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(*fFunctionClasses)["pow"] = FunctionClass::kPow;
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(*fFunctionClasses)["saturate"] = FunctionClass::kSaturate;
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(*fFunctionClasses)["texture"] = FunctionClass::kTexture;
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(*fFunctionClasses)["transpose"] = FunctionClass::kTranspose;
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}
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#ifndef SKSL_STANDALONE
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);
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#endif
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const auto found = c.fFunction.fBuiltin ? fFunctionClasses->find(c.fFunction.fName) :
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fFunctionClasses->end();
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bool isTextureFunctionWithBias = false;
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bool nameWritten = false;
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if (found != fFunctionClasses->end()) {
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switch (found->second) {
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case FunctionClass::kAbs: {
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if (!fProgram.fSettings.fCaps->emulateAbsIntFunction())
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break;
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SkASSERT(c.fArguments.size() == 1);
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if (c.fArguments[0]->fType != *fContext.fInt_Type)
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break;
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// abs(int) on Intel OSX is incorrect, so emulate it:
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String name = "_absemulation";
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this->write(name);
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nameWritten = true;
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if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) {
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fWrittenIntrinsics.insert(name);
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fExtraFunctions.writeText((
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"int " + name + "(int x) {\n"
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" return x * sign(x);\n"
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"}\n"
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).c_str());
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}
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break;
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}
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case FunctionClass::kAtan:
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if (fProgram.fSettings.fCaps->mustForceNegatedAtanParamToFloat() &&
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c.fArguments.size() == 2 &&
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c.fArguments[1]->fKind == Expression::kPrefix_Kind) {
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const PrefixExpression& p = (PrefixExpression&) *c.fArguments[1];
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if (p.fOperator == Token::MINUS) {
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this->write("atan(");
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this->writeExpression(*c.fArguments[0], kSequence_Precedence);
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this->write(", -1.0 * ");
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this->writeExpression(*p.fOperand, kMultiplicative_Precedence);
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this->write(")");
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return;
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}
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}
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break;
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case FunctionClass::kDFdy:
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if (fProgram.fSettings.fFlipY) {
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// Flipping Y also negates the Y derivatives.
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this->write("-dFdy");
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nameWritten = true;
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}
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// fallthru
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case FunctionClass::kDFdx:
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case FunctionClass::kFwidth:
|
if (!fFoundDerivatives &&
|
fProgram.fSettings.fCaps->shaderDerivativeExtensionString()) {
|
SkASSERT(fProgram.fSettings.fCaps->shaderDerivativeSupport());
|
this->writeExtension(fProgram.fSettings.fCaps->shaderDerivativeExtensionString());
|
fFoundDerivatives = true;
|
}
|
break;
|
case FunctionClass::kDeterminant:
|
if (fProgram.fSettings.fCaps->generation() < k150_GrGLSLGeneration) {
|
SkASSERT(c.fArguments.size() == 1);
|
this->writeDeterminantHack(*c.fArguments[0]);
|
return;
|
}
|
break;
|
case FunctionClass::kFMA:
|
if (!fProgram.fSettings.fCaps->builtinFMASupport()) {
|
SkASSERT(c.fArguments.size() == 3);
|
this->write("((");
|
this->writeExpression(*c.fArguments[0], kSequence_Precedence);
|
this->write(") * (");
|
this->writeExpression(*c.fArguments[1], kSequence_Precedence);
|
this->write(") + (");
|
this->writeExpression(*c.fArguments[2], kSequence_Precedence);
|
this->write("))");
|
return;
|
}
|
break;
|
case FunctionClass::kFract:
|
if (!fProgram.fSettings.fCaps->canUseFractForNegativeValues()) {
|
SkASSERT(c.fArguments.size() == 1);
|
this->write("(0.5 - sign(");
|
this->writeExpression(*c.fArguments[0], kSequence_Precedence);
|
this->write(") * (0.5 - fract(abs(");
|
this->writeExpression(*c.fArguments[0], kSequence_Precedence);
|
this->write("))))");
|
return;
|
}
|
break;
|
case FunctionClass::kInverse:
|
if (fProgram.fSettings.fCaps->generation() < k140_GrGLSLGeneration) {
|
SkASSERT(c.fArguments.size() == 1);
|
this->writeInverseHack(*c.fArguments[0]);
|
return;
|
}
|
break;
|
case FunctionClass::kInverseSqrt:
|
if (fProgram.fSettings.fCaps->generation() < k130_GrGLSLGeneration) {
|
SkASSERT(c.fArguments.size() == 1);
|
this->writeInverseSqrtHack(*c.fArguments[0]);
|
return;
|
}
|
break;
|
case FunctionClass::kMin:
|
if (!fProgram.fSettings.fCaps->canUseMinAndAbsTogether()) {
|
SkASSERT(c.fArguments.size() == 2);
|
if (is_abs(*c.fArguments[0])) {
|
this->writeMinAbsHack(*c.fArguments[0], *c.fArguments[1]);
|
return;
|
}
|
if (is_abs(*c.fArguments[1])) {
|
// note that this violates the GLSL left-to-right evaluation semantics.
|
// I doubt it will ever end up mattering, but it's worth calling out.
|
this->writeMinAbsHack(*c.fArguments[1], *c.fArguments[0]);
|
return;
|
}
|
}
|
break;
|
case FunctionClass::kPow:
|
if (!fProgram.fSettings.fCaps->removePowWithConstantExponent()) {
|
break;
|
}
|
// pow(x, y) on some NVIDIA drivers causes crashes if y is a
|
// constant. It's hard to tell what constitutes "constant" here
|
// so just replace in all cases.
|
|
// Change pow(x, y) into exp2(y * log2(x))
|
this->write("exp2(");
|
this->writeExpression(*c.fArguments[1], kMultiplicative_Precedence);
|
this->write(" * log2(");
|
this->writeExpression(*c.fArguments[0], kSequence_Precedence);
|
this->write("))");
|
return;
|
case FunctionClass::kSaturate:
|
SkASSERT(c.fArguments.size() == 1);
|
this->write("clamp(");
|
this->writeExpression(*c.fArguments[0], kSequence_Precedence);
|
this->write(", 0.0, 1.0)");
|
return;
|
case FunctionClass::kTexture: {
|
const char* dim = "";
|
bool proj = false;
|
switch (c.fArguments[0]->fType.dimensions()) {
|
case SpvDim1D:
|
dim = "1D";
|
isTextureFunctionWithBias = true;
|
if (c.fArguments[1]->fType == *fContext.fFloat_Type) {
|
proj = false;
|
} else {
|
SkASSERT(c.fArguments[1]->fType == *fContext.fFloat2_Type);
|
proj = true;
|
}
|
break;
|
case SpvDim2D:
|
dim = "2D";
|
if (c.fArguments[0]->fType != *fContext.fSamplerExternalOES_Type) {
|
isTextureFunctionWithBias = true;
|
}
|
if (c.fArguments[1]->fType == *fContext.fFloat2_Type) {
|
proj = false;
|
} else {
|
SkASSERT(c.fArguments[1]->fType == *fContext.fFloat3_Type);
|
proj = true;
|
}
|
break;
|
case SpvDim3D:
|
dim = "3D";
|
isTextureFunctionWithBias = true;
|
if (c.fArguments[1]->fType == *fContext.fFloat3_Type) {
|
proj = false;
|
} else {
|
SkASSERT(c.fArguments[1]->fType == *fContext.fFloat4_Type);
|
proj = true;
|
}
|
break;
|
case SpvDimCube:
|
dim = "Cube";
|
isTextureFunctionWithBias = true;
|
proj = false;
|
break;
|
case SpvDimRect:
|
dim = "Rect";
|
proj = false;
|
break;
|
case SpvDimBuffer:
|
SkASSERT(false); // doesn't exist
|
dim = "Buffer";
|
proj = false;
|
break;
|
case SpvDimSubpassData:
|
SkASSERT(false); // doesn't exist
|
dim = "SubpassData";
|
proj = false;
|
break;
|
}
|
this->write("texture");
|
if (fProgram.fSettings.fCaps->generation() < k130_GrGLSLGeneration) {
|
this->write(dim);
|
}
|
if (proj) {
|
this->write("Proj");
|
}
|
nameWritten = true;
|
break;
|
}
|
case FunctionClass::kTranspose:
|
if (fProgram.fSettings.fCaps->generation() < k130_GrGLSLGeneration) {
|
SkASSERT(c.fArguments.size() == 1);
|
this->writeTransposeHack(*c.fArguments[0]);
|
return;
|
}
|
break;
|
}
|
}
|
if (!nameWritten) {
|
this->write(c.fFunction.fName);
|
}
|
this->write("(");
|
const char* separator = "";
|
for (const auto& arg : c.fArguments) {
|
this->write(separator);
|
separator = ", ";
|
this->writeExpression(*arg, kSequence_Precedence);
|
}
|
if (fProgram.fSettings.fSharpenTextures && isTextureFunctionWithBias) {
|
this->write(", -0.5");
|
}
|
this->write(")");
|
}
|
|
void GLSLCodeGenerator::writeConstructor(const Constructor& c, Precedence parentPrecedence) {
|
if (c.fArguments.size() == 1 &&
|
(this->getTypeName(c.fType) == this->getTypeName(c.fArguments[0]->fType) ||
|
(c.fType.kind() == Type::kScalar_Kind &&
|
c.fArguments[0]->fType == *fContext.fFloatLiteral_Type))) {
|
// in cases like half(float), they're different types as far as SkSL is concerned but the
|
// same type as far as GLSL is concerned. We avoid a redundant float(float) by just writing
|
// out the inner expression here.
|
this->writeExpression(*c.fArguments[0], parentPrecedence);
|
return;
|
}
|
this->writeType(c.fType);
|
this->write("(");
|
const char* separator = "";
|
for (const auto& arg : c.fArguments) {
|
this->write(separator);
|
separator = ", ";
|
this->writeExpression(*arg, kSequence_Precedence);
|
}
|
this->write(")");
|
}
|
|
void GLSLCodeGenerator::writeFragCoord() {
|
if (!fProgram.fSettings.fCaps->canUseFragCoord()) {
|
if (!fSetupFragCoordWorkaround) {
|
const char* precision = usesPrecisionModifiers() ? "highp " : "";
|
fFunctionHeader += precision;
|
fFunctionHeader += " float sk_FragCoord_InvW = 1. / sk_FragCoord_Workaround.w;\n";
|
fFunctionHeader += precision;
|
fFunctionHeader += " vec4 sk_FragCoord_Resolved = "
|
"vec4(sk_FragCoord_Workaround.xyz * sk_FragCoord_InvW, sk_FragCoord_InvW);\n";
|
// Ensure that we get exact .5 values for x and y.
|
fFunctionHeader += " sk_FragCoord_Resolved.xy = floor(sk_FragCoord_Resolved.xy) + "
|
"vec2(.5);\n";
|
fSetupFragCoordWorkaround = true;
|
}
|
this->write("sk_FragCoord_Resolved");
|
return;
|
}
|
|
// We only declare "gl_FragCoord" when we're in the case where we want to use layout qualifiers
|
// to reverse y. Otherwise it isn't necessary and whether the "in" qualifier appears in the
|
// declaration varies in earlier GLSL specs. So it is simpler to omit it.
|
if (!fProgram.fSettings.fFlipY) {
|
this->write("gl_FragCoord");
|
} else if (const char* extension =
|
fProgram.fSettings.fCaps->fragCoordConventionsExtensionString()) {
|
if (!fSetupFragPositionGlobal) {
|
if (fProgram.fSettings.fCaps->generation() < k150_GrGLSLGeneration) {
|
this->writeExtension(extension);
|
}
|
fGlobals.writeText("layout(origin_upper_left) in vec4 gl_FragCoord;\n");
|
fSetupFragPositionGlobal = true;
|
}
|
this->write("gl_FragCoord");
|
} else {
|
if (!fSetupFragPositionLocal) {
|
fFunctionHeader += usesPrecisionModifiers() ? "highp " : "";
|
fFunctionHeader += " vec4 sk_FragCoord = vec4(gl_FragCoord.x, " SKSL_RTHEIGHT_NAME
|
" - gl_FragCoord.y, gl_FragCoord.z, gl_FragCoord.w);\n";
|
fSetupFragPositionLocal = true;
|
}
|
this->write("sk_FragCoord");
|
}
|
}
|
|
void GLSLCodeGenerator::writeVariableReference(const VariableReference& ref) {
|
switch (ref.fVariable.fModifiers.fLayout.fBuiltin) {
|
case SK_FRAGCOLOR_BUILTIN:
|
if (fProgram.fSettings.fCaps->mustDeclareFragmentShaderOutput()) {
|
this->write("sk_FragColor");
|
} else {
|
this->write("gl_FragColor");
|
}
|
break;
|
case SK_FRAGCOORD_BUILTIN:
|
this->writeFragCoord();
|
break;
|
case SK_WIDTH_BUILTIN:
|
this->write("u_skRTWidth");
|
break;
|
case SK_HEIGHT_BUILTIN:
|
this->write("u_skRTHeight");
|
break;
|
case SK_CLOCKWISE_BUILTIN:
|
this->write(fProgram.fSettings.fFlipY ? "(!gl_FrontFacing)" : "gl_FrontFacing");
|
break;
|
case SK_VERTEXID_BUILTIN:
|
this->write("gl_VertexID");
|
break;
|
case SK_INSTANCEID_BUILTIN:
|
this->write("gl_InstanceID");
|
break;
|
case SK_CLIPDISTANCE_BUILTIN:
|
this->write("gl_ClipDistance");
|
break;
|
case SK_IN_BUILTIN:
|
this->write("gl_in");
|
break;
|
case SK_INVOCATIONID_BUILTIN:
|
this->write("gl_InvocationID");
|
break;
|
case SK_LASTFRAGCOLOR_BUILTIN:
|
this->write(fProgram.fSettings.fCaps->fbFetchColorName());
|
break;
|
default:
|
this->write(ref.fVariable.fName);
|
}
|
}
|
|
void GLSLCodeGenerator::writeIndexExpression(const IndexExpression& expr) {
|
this->writeExpression(*expr.fBase, kPostfix_Precedence);
|
this->write("[");
|
this->writeExpression(*expr.fIndex, kTopLevel_Precedence);
|
this->write("]");
|
}
|
|
bool is_sk_position(const FieldAccess& f) {
|
return "sk_Position" == f.fBase->fType.fields()[f.fFieldIndex].fName;
|
}
|
|
void GLSLCodeGenerator::writeFieldAccess(const FieldAccess& f) {
|
if (f.fOwnerKind == FieldAccess::kDefault_OwnerKind) {
|
this->writeExpression(*f.fBase, kPostfix_Precedence);
|
this->write(".");
|
}
|
switch (f.fBase->fType.fields()[f.fFieldIndex].fModifiers.fLayout.fBuiltin) {
|
case SK_CLIPDISTANCE_BUILTIN:
|
this->write("gl_ClipDistance");
|
break;
|
default:
|
StringFragment name = f.fBase->fType.fields()[f.fFieldIndex].fName;
|
if (name == "sk_Position") {
|
this->write("gl_Position");
|
} else if (name == "sk_PointSize") {
|
this->write("gl_PointSize");
|
} else {
|
this->write(f.fBase->fType.fields()[f.fFieldIndex].fName);
|
}
|
}
|
}
|
|
void GLSLCodeGenerator::writeSwizzle(const Swizzle& swizzle) {
|
int last = swizzle.fComponents.back();
|
if (last == SKSL_SWIZZLE_0 || last == SKSL_SWIZZLE_1) {
|
this->writeType(swizzle.fType);
|
this->write("(");
|
}
|
this->writeExpression(*swizzle.fBase, kPostfix_Precedence);
|
this->write(".");
|
for (int c : swizzle.fComponents) {
|
if (c >= 0) {
|
this->write(&("x\0y\0z\0w\0"[c * 2]));
|
}
|
}
|
if (last == SKSL_SWIZZLE_0) {
|
this->write(", 0)");
|
}
|
else if (last == SKSL_SWIZZLE_1) {
|
this->write(", 1)");
|
}
|
}
|
|
GLSLCodeGenerator::Precedence GLSLCodeGenerator::GetBinaryPrecedence(Token::Kind op) {
|
switch (op) {
|
case Token::STAR: // fall through
|
case Token::SLASH: // fall through
|
case Token::PERCENT: return GLSLCodeGenerator::kMultiplicative_Precedence;
|
case Token::PLUS: // fall through
|
case Token::MINUS: return GLSLCodeGenerator::kAdditive_Precedence;
|
case Token::SHL: // fall through
|
case Token::SHR: return GLSLCodeGenerator::kShift_Precedence;
|
case Token::LT: // fall through
|
case Token::GT: // fall through
|
case Token::LTEQ: // fall through
|
case Token::GTEQ: return GLSLCodeGenerator::kRelational_Precedence;
|
case Token::EQEQ: // fall through
|
case Token::NEQ: return GLSLCodeGenerator::kEquality_Precedence;
|
case Token::BITWISEAND: return GLSLCodeGenerator::kBitwiseAnd_Precedence;
|
case Token::BITWISEXOR: return GLSLCodeGenerator::kBitwiseXor_Precedence;
|
case Token::BITWISEOR: return GLSLCodeGenerator::kBitwiseOr_Precedence;
|
case Token::LOGICALAND: return GLSLCodeGenerator::kLogicalAnd_Precedence;
|
case Token::LOGICALXOR: return GLSLCodeGenerator::kLogicalXor_Precedence;
|
case Token::LOGICALOR: return GLSLCodeGenerator::kLogicalOr_Precedence;
|
case Token::EQ: // fall through
|
case Token::PLUSEQ: // fall through
|
case Token::MINUSEQ: // fall through
|
case Token::STAREQ: // fall through
|
case Token::SLASHEQ: // fall through
|
case Token::PERCENTEQ: // fall through
|
case Token::SHLEQ: // fall through
|
case Token::SHREQ: // fall through
|
case Token::LOGICALANDEQ: // fall through
|
case Token::LOGICALXOREQ: // fall through
|
case Token::LOGICALOREQ: // fall through
|
case Token::BITWISEANDEQ: // fall through
|
case Token::BITWISEXOREQ: // fall through
|
case Token::BITWISEOREQ: return GLSLCodeGenerator::kAssignment_Precedence;
|
case Token::COMMA: return GLSLCodeGenerator::kSequence_Precedence;
|
default: ABORT("unsupported binary operator");
|
}
|
}
|
|
void GLSLCodeGenerator::writeBinaryExpression(const BinaryExpression& b,
|
Precedence parentPrecedence) {
|
if (fProgram.fSettings.fCaps->unfoldShortCircuitAsTernary() &&
|
(b.fOperator == Token::LOGICALAND || b.fOperator == Token::LOGICALOR)) {
|
this->writeShortCircuitWorkaroundExpression(b, parentPrecedence);
|
return;
|
}
|
|
Precedence precedence = GetBinaryPrecedence(b.fOperator);
|
if (precedence >= parentPrecedence) {
|
this->write("(");
|
}
|
bool positionWorkaround = fProgramKind == Program::Kind::kVertex_Kind &&
|
Compiler::IsAssignment(b.fOperator) &&
|
Expression::kFieldAccess_Kind == b.fLeft->fKind &&
|
is_sk_position((FieldAccess&) *b.fLeft) &&
|
!strstr(b.fRight->description().c_str(), "sk_RTAdjust") &&
|
!fProgram.fSettings.fCaps->canUseFragCoord();
|
if (positionWorkaround) {
|
this->write("sk_FragCoord_Workaround = (");
|
}
|
this->writeExpression(*b.fLeft, precedence);
|
this->write(" ");
|
this->write(Compiler::OperatorName(b.fOperator));
|
this->write(" ");
|
this->writeExpression(*b.fRight, precedence);
|
if (positionWorkaround) {
|
this->write(")");
|
}
|
if (precedence >= parentPrecedence) {
|
this->write(")");
|
}
|
}
|
|
void GLSLCodeGenerator::writeShortCircuitWorkaroundExpression(const BinaryExpression& b,
|
Precedence parentPrecedence) {
|
if (kTernary_Precedence >= parentPrecedence) {
|
this->write("(");
|
}
|
|
// Transform:
|
// a && b => a ? b : false
|
// a || b => a ? true : b
|
this->writeExpression(*b.fLeft, kTernary_Precedence);
|
this->write(" ? ");
|
if (b.fOperator == Token::LOGICALAND) {
|
this->writeExpression(*b.fRight, kTernary_Precedence);
|
} else {
|
BoolLiteral boolTrue(fContext, -1, true);
|
this->writeBoolLiteral(boolTrue);
|
}
|
this->write(" : ");
|
if (b.fOperator == Token::LOGICALAND) {
|
BoolLiteral boolFalse(fContext, -1, false);
|
this->writeBoolLiteral(boolFalse);
|
} else {
|
this->writeExpression(*b.fRight, kTernary_Precedence);
|
}
|
if (kTernary_Precedence >= parentPrecedence) {
|
this->write(")");
|
}
|
}
|
|
void GLSLCodeGenerator::writeTernaryExpression(const TernaryExpression& t,
|
Precedence parentPrecedence) {
|
if (kTernary_Precedence >= parentPrecedence) {
|
this->write("(");
|
}
|
this->writeExpression(*t.fTest, kTernary_Precedence);
|
this->write(" ? ");
|
this->writeExpression(*t.fIfTrue, kTernary_Precedence);
|
this->write(" : ");
|
this->writeExpression(*t.fIfFalse, kTernary_Precedence);
|
if (kTernary_Precedence >= parentPrecedence) {
|
this->write(")");
|
}
|
}
|
|
void GLSLCodeGenerator::writePrefixExpression(const PrefixExpression& p,
|
Precedence parentPrecedence) {
|
if (kPrefix_Precedence >= parentPrecedence) {
|
this->write("(");
|
}
|
this->write(Compiler::OperatorName(p.fOperator));
|
this->writeExpression(*p.fOperand, kPrefix_Precedence);
|
if (kPrefix_Precedence >= parentPrecedence) {
|
this->write(")");
|
}
|
}
|
|
void GLSLCodeGenerator::writePostfixExpression(const PostfixExpression& p,
|
Precedence parentPrecedence) {
|
if (kPostfix_Precedence >= parentPrecedence) {
|
this->write("(");
|
}
|
this->writeExpression(*p.fOperand, kPostfix_Precedence);
|
this->write(Compiler::OperatorName(p.fOperator));
|
if (kPostfix_Precedence >= parentPrecedence) {
|
this->write(")");
|
}
|
}
|
|
void GLSLCodeGenerator::writeBoolLiteral(const BoolLiteral& b) {
|
this->write(b.fValue ? "true" : "false");
|
}
|
|
void GLSLCodeGenerator::writeIntLiteral(const IntLiteral& i) {
|
if (i.fType == *fContext.fUInt_Type) {
|
this->write(to_string(i.fValue & 0xffffffff) + "u");
|
} else if (i.fType == *fContext.fUShort_Type) {
|
this->write(to_string(i.fValue & 0xffff) + "u");
|
} else if (i.fType == *fContext.fUByte_Type) {
|
this->write(to_string(i.fValue & 0xff) + "u");
|
} else {
|
this->write(to_string((int32_t) i.fValue));
|
}
|
}
|
|
void GLSLCodeGenerator::writeFloatLiteral(const FloatLiteral& f) {
|
this->write(to_string(f.fValue));
|
}
|
|
void GLSLCodeGenerator::writeSetting(const Setting& s) {
|
ABORT("internal error; setting was not folded to a constant during compilation\n");
|
}
|
|
void GLSLCodeGenerator::writeFunction(const FunctionDefinition& f) {
|
if (fProgramKind != Program::kPipelineStage_Kind) {
|
this->writeTypePrecision(f.fDeclaration.fReturnType);
|
this->writeType(f.fDeclaration.fReturnType);
|
this->write(" " + f.fDeclaration.fName + "(");
|
const char* separator = "";
|
for (const auto& param : f.fDeclaration.fParameters) {
|
this->write(separator);
|
separator = ", ";
|
this->writeModifiers(param->fModifiers, false);
|
std::vector<int> sizes;
|
const Type* type = ¶m->fType;
|
while (type->kind() == Type::kArray_Kind) {
|
sizes.push_back(type->columns());
|
type = &type->componentType();
|
}
|
this->writeTypePrecision(*type);
|
this->writeType(*type);
|
this->write(" " + param->fName);
|
for (int s : sizes) {
|
if (s <= 0) {
|
this->write("[]");
|
} else {
|
this->write("[" + to_string(s) + "]");
|
}
|
}
|
}
|
this->writeLine(") {");
|
fIndentation++;
|
}
|
fFunctionHeader = "";
|
OutputStream* oldOut = fOut;
|
StringStream buffer;
|
fOut = &buffer;
|
this->writeStatements(((Block&) *f.fBody).fStatements);
|
if (fProgramKind != Program::kPipelineStage_Kind) {
|
fIndentation--;
|
this->writeLine("}");
|
}
|
|
fOut = oldOut;
|
this->write(fFunctionHeader);
|
this->write(buffer.str());
|
}
|
|
void GLSLCodeGenerator::writeModifiers(const Modifiers& modifiers,
|
bool globalContext) {
|
if (modifiers.fFlags & Modifiers::kFlat_Flag) {
|
this->write("flat ");
|
}
|
if (modifiers.fFlags & Modifiers::kNoPerspective_Flag) {
|
this->write("noperspective ");
|
}
|
String layout = modifiers.fLayout.description();
|
if (layout.size()) {
|
this->write(layout + " ");
|
}
|
if (modifiers.fFlags & Modifiers::kReadOnly_Flag) {
|
this->write("readonly ");
|
}
|
if (modifiers.fFlags & Modifiers::kWriteOnly_Flag) {
|
this->write("writeonly ");
|
}
|
if (modifiers.fFlags & Modifiers::kCoherent_Flag) {
|
this->write("coherent ");
|
}
|
if (modifiers.fFlags & Modifiers::kVolatile_Flag) {
|
this->write("volatile ");
|
}
|
if (modifiers.fFlags & Modifiers::kRestrict_Flag) {
|
this->write("restrict ");
|
}
|
if ((modifiers.fFlags & Modifiers::kIn_Flag) &&
|
(modifiers.fFlags & Modifiers::kOut_Flag)) {
|
this->write("inout ");
|
} else if (modifiers.fFlags & Modifiers::kIn_Flag) {
|
if (globalContext &&
|
fProgram.fSettings.fCaps->generation() < GrGLSLGeneration::k130_GrGLSLGeneration) {
|
this->write(fProgramKind == Program::kVertex_Kind ? "attribute "
|
: "varying ");
|
} else {
|
this->write("in ");
|
}
|
} else if (modifiers.fFlags & Modifiers::kOut_Flag) {
|
if (globalContext &&
|
fProgram.fSettings.fCaps->generation() < GrGLSLGeneration::k130_GrGLSLGeneration) {
|
this->write("varying ");
|
} else {
|
this->write("out ");
|
}
|
}
|
if (modifiers.fFlags & Modifiers::kUniform_Flag) {
|
this->write("uniform ");
|
}
|
if (modifiers.fFlags & Modifiers::kConst_Flag) {
|
this->write("const ");
|
}
|
if (modifiers.fFlags & Modifiers::kPLS_Flag) {
|
this->write("__pixel_localEXT ");
|
}
|
if (modifiers.fFlags & Modifiers::kPLSIn_Flag) {
|
this->write("__pixel_local_inEXT ");
|
}
|
if (modifiers.fFlags & Modifiers::kPLSOut_Flag) {
|
this->write("__pixel_local_outEXT ");
|
}
|
switch (modifiers.fLayout.fFormat) {
|
case Layout::Format::kUnspecified:
|
break;
|
case Layout::Format::kRGBA32F: // fall through
|
case Layout::Format::kR32F:
|
this->write("highp ");
|
break;
|
case Layout::Format::kRGBA16F: // fall through
|
case Layout::Format::kR16F: // fall through
|
case Layout::Format::kRG16F:
|
this->write("mediump ");
|
break;
|
case Layout::Format::kRGBA8: // fall through
|
case Layout::Format::kR8: // fall through
|
case Layout::Format::kRGBA8I: // fall through
|
case Layout::Format::kR8I:
|
this->write("lowp ");
|
break;
|
}
|
}
|
|
void GLSLCodeGenerator::writeInterfaceBlock(const InterfaceBlock& intf) {
|
if (intf.fTypeName == "sk_PerVertex") {
|
return;
|
}
|
this->writeModifiers(intf.fVariable.fModifiers, true);
|
this->writeLine(intf.fTypeName + " {");
|
fIndentation++;
|
const Type* structType = &intf.fVariable.fType;
|
while (structType->kind() == Type::kArray_Kind) {
|
structType = &structType->componentType();
|
}
|
for (const auto& f : structType->fields()) {
|
this->writeModifiers(f.fModifiers, false);
|
this->writeTypePrecision(*f.fType);
|
this->writeType(*f.fType);
|
this->writeLine(" " + f.fName + ";");
|
}
|
fIndentation--;
|
this->write("}");
|
if (intf.fInstanceName.size()) {
|
this->write(" ");
|
this->write(intf.fInstanceName);
|
for (const auto& size : intf.fSizes) {
|
this->write("[");
|
if (size) {
|
this->writeExpression(*size, kTopLevel_Precedence);
|
}
|
this->write("]");
|
}
|
}
|
this->writeLine(";");
|
}
|
|
void GLSLCodeGenerator::writeVarInitializer(const Variable& var, const Expression& value) {
|
this->writeExpression(value, kTopLevel_Precedence);
|
}
|
|
const char* GLSLCodeGenerator::getTypePrecision(const Type& type) {
|
if (usesPrecisionModifiers()) {
|
switch (type.kind()) {
|
case Type::kScalar_Kind:
|
if (type == *fContext.fShort_Type || type == *fContext.fUShort_Type ||
|
type == *fContext.fByte_Type || type == *fContext.fUByte_Type) {
|
if (fProgram.fSettings.fForceHighPrecision ||
|
fProgram.fSettings.fCaps->incompleteShortIntPrecision()) {
|
return "highp ";
|
}
|
return "mediump ";
|
}
|
if (type == *fContext.fHalf_Type) {
|
return fProgram.fSettings.fForceHighPrecision ? "highp " : "mediump ";
|
}
|
if (type == *fContext.fFloat_Type || type == *fContext.fInt_Type ||
|
type == *fContext.fUInt_Type) {
|
return "highp ";
|
}
|
return "";
|
case Type::kVector_Kind: // fall through
|
case Type::kMatrix_Kind:
|
return this->getTypePrecision(type.componentType());
|
default:
|
break;
|
}
|
}
|
return "";
|
}
|
|
void GLSLCodeGenerator::writeTypePrecision(const Type& type) {
|
this->write(this->getTypePrecision(type));
|
}
|
|
void GLSLCodeGenerator::writeVarDeclarations(const VarDeclarations& decl, bool global) {
|
if (!decl.fVars.size()) {
|
return;
|
}
|
bool wroteType = false;
|
for (const auto& stmt : decl.fVars) {
|
VarDeclaration& var = (VarDeclaration&) *stmt;
|
if (wroteType) {
|
this->write(", ");
|
} else {
|
this->writeModifiers(var.fVar->fModifiers, global);
|
this->writeTypePrecision(decl.fBaseType);
|
this->writeType(decl.fBaseType);
|
this->write(" ");
|
wroteType = true;
|
}
|
this->write(var.fVar->fName);
|
for (const auto& size : var.fSizes) {
|
this->write("[");
|
if (size) {
|
this->writeExpression(*size, kTopLevel_Precedence);
|
}
|
this->write("]");
|
}
|
if (var.fValue) {
|
this->write(" = ");
|
this->writeVarInitializer(*var.fVar, *var.fValue);
|
}
|
if (!fFoundImageDecl && var.fVar->fType == *fContext.fImage2D_Type) {
|
if (fProgram.fSettings.fCaps->imageLoadStoreExtensionString()) {
|
this->writeExtension(fProgram.fSettings.fCaps->imageLoadStoreExtensionString());
|
}
|
fFoundImageDecl = true;
|
}
|
if (!fFoundExternalSamplerDecl && var.fVar->fType == *fContext.fSamplerExternalOES_Type) {
|
if (fProgram.fSettings.fCaps->externalTextureExtensionString()) {
|
this->writeExtension(fProgram.fSettings.fCaps->externalTextureExtensionString());
|
}
|
if (fProgram.fSettings.fCaps->secondExternalTextureExtensionString()) {
|
this->writeExtension(
|
fProgram.fSettings.fCaps->secondExternalTextureExtensionString());
|
}
|
fFoundExternalSamplerDecl = true;
|
}
|
}
|
if (wroteType) {
|
this->write(";");
|
}
|
}
|
|
void GLSLCodeGenerator::writeStatement(const Statement& s) {
|
switch (s.fKind) {
|
case Statement::kBlock_Kind:
|
this->writeBlock((Block&) s);
|
break;
|
case Statement::kExpression_Kind:
|
this->writeExpression(*((ExpressionStatement&) s).fExpression, kTopLevel_Precedence);
|
this->write(";");
|
break;
|
case Statement::kReturn_Kind:
|
this->writeReturnStatement((ReturnStatement&) s);
|
break;
|
case Statement::kVarDeclarations_Kind:
|
this->writeVarDeclarations(*((VarDeclarationsStatement&) s).fDeclaration, false);
|
break;
|
case Statement::kIf_Kind:
|
this->writeIfStatement((IfStatement&) s);
|
break;
|
case Statement::kFor_Kind:
|
this->writeForStatement((ForStatement&) s);
|
break;
|
case Statement::kWhile_Kind:
|
this->writeWhileStatement((WhileStatement&) s);
|
break;
|
case Statement::kDo_Kind:
|
this->writeDoStatement((DoStatement&) s);
|
break;
|
case Statement::kSwitch_Kind:
|
this->writeSwitchStatement((SwitchStatement&) s);
|
break;
|
case Statement::kBreak_Kind:
|
this->write("break;");
|
break;
|
case Statement::kContinue_Kind:
|
this->write("continue;");
|
break;
|
case Statement::kDiscard_Kind:
|
this->write("discard;");
|
break;
|
case Statement::kNop_Kind:
|
this->write(";");
|
break;
|
default:
|
ABORT("unsupported statement: %s", s.description().c_str());
|
}
|
}
|
|
void GLSLCodeGenerator::writeStatements(const std::vector<std::unique_ptr<Statement>>& statements) {
|
for (const auto& s : statements) {
|
if (!s->isEmpty()) {
|
this->writeStatement(*s);
|
this->writeLine();
|
}
|
}
|
}
|
|
void GLSLCodeGenerator::writeBlock(const Block& b) {
|
this->writeLine("{");
|
fIndentation++;
|
this->writeStatements(b.fStatements);
|
fIndentation--;
|
this->write("}");
|
}
|
|
void GLSLCodeGenerator::writeIfStatement(const IfStatement& stmt) {
|
this->write("if (");
|
this->writeExpression(*stmt.fTest, kTopLevel_Precedence);
|
this->write(") ");
|
this->writeStatement(*stmt.fIfTrue);
|
if (stmt.fIfFalse) {
|
this->write(" else ");
|
this->writeStatement(*stmt.fIfFalse);
|
}
|
}
|
|
void GLSLCodeGenerator::writeForStatement(const ForStatement& f) {
|
this->write("for (");
|
if (f.fInitializer && !f.fInitializer->isEmpty()) {
|
this->writeStatement(*f.fInitializer);
|
} else {
|
this->write("; ");
|
}
|
if (f.fTest) {
|
if (fProgram.fSettings.fCaps->addAndTrueToLoopCondition()) {
|
std::unique_ptr<Expression> and_true(new BinaryExpression(
|
-1, f.fTest->clone(), Token::LOGICALAND,
|
std::unique_ptr<BoolLiteral>(new BoolLiteral(fContext, -1,
|
true)),
|
*fContext.fBool_Type));
|
this->writeExpression(*and_true, kTopLevel_Precedence);
|
} else {
|
this->writeExpression(*f.fTest, kTopLevel_Precedence);
|
}
|
}
|
this->write("; ");
|
if (f.fNext) {
|
this->writeExpression(*f.fNext, kTopLevel_Precedence);
|
}
|
this->write(") ");
|
this->writeStatement(*f.fStatement);
|
}
|
|
void GLSLCodeGenerator::writeWhileStatement(const WhileStatement& w) {
|
this->write("while (");
|
this->writeExpression(*w.fTest, kTopLevel_Precedence);
|
this->write(") ");
|
this->writeStatement(*w.fStatement);
|
}
|
|
void GLSLCodeGenerator::writeDoStatement(const DoStatement& d) {
|
if (!fProgram.fSettings.fCaps->rewriteDoWhileLoops()) {
|
this->write("do ");
|
this->writeStatement(*d.fStatement);
|
this->write(" while (");
|
this->writeExpression(*d.fTest, kTopLevel_Precedence);
|
this->write(");");
|
return;
|
}
|
|
// Otherwise, do the do while loop workaround, to rewrite loops of the form:
|
// do {
|
// CODE;
|
// } while (CONDITION)
|
//
|
// to loops of the form
|
// bool temp = false;
|
// while (true) {
|
// if (temp) {
|
// if (!CONDITION) {
|
// break;
|
// }
|
// }
|
// temp = true;
|
// CODE;
|
// }
|
String tmpVar = "_tmpLoopSeenOnce" + to_string(fVarCount++);
|
this->write("bool ");
|
this->write(tmpVar);
|
this->writeLine(" = false;");
|
this->writeLine("while (true) {");
|
fIndentation++;
|
this->write("if (");
|
this->write(tmpVar);
|
this->writeLine(") {");
|
fIndentation++;
|
this->write("if (!");
|
this->writeExpression(*d.fTest, kPrefix_Precedence);
|
this->writeLine(") {");
|
fIndentation++;
|
this->writeLine("break;");
|
fIndentation--;
|
this->writeLine("}");
|
fIndentation--;
|
this->writeLine("}");
|
this->write(tmpVar);
|
this->writeLine(" = true;");
|
this->writeStatement(*d.fStatement);
|
this->writeLine();
|
fIndentation--;
|
this->write("}");
|
}
|
|
void GLSLCodeGenerator::writeSwitchStatement(const SwitchStatement& s) {
|
this->write("switch (");
|
this->writeExpression(*s.fValue, kTopLevel_Precedence);
|
this->writeLine(") {");
|
fIndentation++;
|
for (const auto& c : s.fCases) {
|
if (c->fValue) {
|
this->write("case ");
|
this->writeExpression(*c->fValue, kTopLevel_Precedence);
|
this->writeLine(":");
|
} else {
|
this->writeLine("default:");
|
}
|
fIndentation++;
|
for (const auto& stmt : c->fStatements) {
|
this->writeStatement(*stmt);
|
this->writeLine();
|
}
|
fIndentation--;
|
}
|
fIndentation--;
|
this->write("}");
|
}
|
|
void GLSLCodeGenerator::writeReturnStatement(const ReturnStatement& r) {
|
this->write("return");
|
if (r.fExpression) {
|
this->write(" ");
|
this->writeExpression(*r.fExpression, kTopLevel_Precedence);
|
}
|
this->write(";");
|
}
|
|
void GLSLCodeGenerator::writeHeader() {
|
this->write(fProgram.fSettings.fCaps->versionDeclString());
|
this->writeLine();
|
}
|
|
void GLSLCodeGenerator::writeProgramElement(const ProgramElement& e) {
|
switch (e.fKind) {
|
case ProgramElement::kExtension_Kind:
|
this->writeExtension(((Extension&) e).fName);
|
break;
|
case ProgramElement::kVar_Kind: {
|
VarDeclarations& decl = (VarDeclarations&) e;
|
if (decl.fVars.size() > 0) {
|
int builtin = ((VarDeclaration&) *decl.fVars[0]).fVar->fModifiers.fLayout.fBuiltin;
|
if (builtin == -1) {
|
// normal var
|
this->writeVarDeclarations(decl, true);
|
this->writeLine();
|
} else if (builtin == SK_FRAGCOLOR_BUILTIN &&
|
fProgram.fSettings.fCaps->mustDeclareFragmentShaderOutput() &&
|
((VarDeclaration&) *decl.fVars[0]).fVar->fWriteCount) {
|
if (fProgram.fSettings.fFragColorIsInOut) {
|
this->write("inout ");
|
} else {
|
this->write("out ");
|
}
|
if (usesPrecisionModifiers()) {
|
this->write("mediump ");
|
}
|
this->writeLine("vec4 sk_FragColor;");
|
}
|
}
|
break;
|
}
|
case ProgramElement::kInterfaceBlock_Kind:
|
this->writeInterfaceBlock((InterfaceBlock&) e);
|
break;
|
case ProgramElement::kFunction_Kind:
|
this->writeFunction((FunctionDefinition&) e);
|
break;
|
case ProgramElement::kModifiers_Kind: {
|
const Modifiers& modifiers = ((ModifiersDeclaration&) e).fModifiers;
|
if (!fFoundGSInvocations && modifiers.fLayout.fInvocations >= 0) {
|
if (fProgram.fSettings.fCaps->gsInvocationsExtensionString()) {
|
this->writeExtension(fProgram.fSettings.fCaps->gsInvocationsExtensionString());
|
}
|
fFoundGSInvocations = true;
|
}
|
this->writeModifiers(modifiers, true);
|
this->writeLine(";");
|
break;
|
}
|
case ProgramElement::kEnum_Kind:
|
break;
|
default:
|
printf("%s\n", e.description().c_str());
|
ABORT("unsupported program element");
|
}
|
}
|
|
void GLSLCodeGenerator::writeInputVars() {
|
if (fProgram.fInputs.fRTWidth) {
|
const char* precision = usesPrecisionModifiers() ? "highp " : "";
|
fGlobals.writeText("uniform ");
|
fGlobals.writeText(precision);
|
fGlobals.writeText("float " SKSL_RTWIDTH_NAME ";\n");
|
}
|
if (fProgram.fInputs.fRTHeight) {
|
const char* precision = usesPrecisionModifiers() ? "highp " : "";
|
fGlobals.writeText("uniform ");
|
fGlobals.writeText(precision);
|
fGlobals.writeText("float " SKSL_RTHEIGHT_NAME ";\n");
|
}
|
}
|
|
bool GLSLCodeGenerator::generateCode() {
|
if (fProgramKind != Program::kPipelineStage_Kind) {
|
this->writeHeader();
|
}
|
if (Program::kGeometry_Kind == fProgramKind &&
|
fProgram.fSettings.fCaps->geometryShaderExtensionString()) {
|
this->writeExtension(fProgram.fSettings.fCaps->geometryShaderExtensionString());
|
}
|
OutputStream* rawOut = fOut;
|
StringStream body;
|
fOut = &body;
|
for (const auto& e : fProgram) {
|
this->writeProgramElement(e);
|
}
|
fOut = rawOut;
|
|
write_stringstream(fExtensions, *rawOut);
|
this->writeInputVars();
|
write_stringstream(fGlobals, *rawOut);
|
|
if (!fProgram.fSettings.fCaps->canUseFragCoord()) {
|
Layout layout;
|
switch (fProgram.fKind) {
|
case Program::kVertex_Kind: {
|
Modifiers modifiers(layout, Modifiers::kOut_Flag);
|
this->writeModifiers(modifiers, true);
|
if (this->usesPrecisionModifiers()) {
|
this->write("highp ");
|
}
|
this->write("vec4 sk_FragCoord_Workaround;\n");
|
break;
|
}
|
case Program::kFragment_Kind: {
|
Modifiers modifiers(layout, Modifiers::kIn_Flag);
|
this->writeModifiers(modifiers, true);
|
if (this->usesPrecisionModifiers()) {
|
this->write("highp ");
|
}
|
this->write("vec4 sk_FragCoord_Workaround;\n");
|
break;
|
}
|
default:
|
break;
|
}
|
}
|
|
if (this->usesPrecisionModifiers()) {
|
this->writeLine("precision mediump float;");
|
}
|
write_stringstream(fExtraFunctions, *rawOut);
|
write_stringstream(body, *rawOut);
|
return true;
|
}
|
|
}
|
