#ifndef _RRSHADINGCONTEXT_HPP
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#define _RRSHADINGCONTEXT_HPP
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/*-------------------------------------------------------------------------
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* drawElements Quality Program Reference Renderer
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* -----------------------------------------------
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*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*//*!
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* \file
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* \brief Shading context
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*//*--------------------------------------------------------------------*/
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#include "rrDefs.hpp"
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#include "rrGenericVector.hpp"
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#include "rrFragmentPacket.hpp"
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namespace rr
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{
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/*--------------------------------------------------------------------*//*!
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* \brief Fragment shading context
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*
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* Contains per-primitive information used in fragment shading
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*//*--------------------------------------------------------------------*/
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struct FragmentShadingContext
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{
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FragmentShadingContext (const GenericVec4* varying0, const GenericVec4* varying1, const GenericVec4* varying2, GenericVec4* outputArray, float* fragmentDepths, int primitiveID, int numFragmentOutputs, int numSamples, FaceType visibleFace_);
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const GenericVec4* varyings[3]; //!< Vertex shader outputs. Pointer will be NULL if there is no such vertex.
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GenericVec4* const outputArray; //!< Fragment output array
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const int primitiveID; //!< Geometry shader output
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const int numFragmentOutputs; //!< Fragment output count
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const int numSamples; //!< Number of samples
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float* fragmentDepths; //!< Fragment packet depths. Pointer will be NULL if there is no depth buffer. Each sample has per-sample depth values
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FaceType visibleFace; //!< Which face (front or back) is visible
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};
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// Write output
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template <typename T>
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void writeFragmentOutput (const FragmentShadingContext& context, int packetNdx, int fragNdx, int outputNdx, const T& value)
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{
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DE_ASSERT(packetNdx >= 0);
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DE_ASSERT(fragNdx >= 0 && fragNdx < 4);
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DE_ASSERT(outputNdx >= 0 && outputNdx < context.numFragmentOutputs);
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context.outputArray[outputNdx + context.numFragmentOutputs*(fragNdx + packetNdx*4)] = value;
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}
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// Read Varying
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template <typename T>
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tcu::Vector<T, 4> readPointVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx)
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{
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DE_UNREF(fragNdx);
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DE_UNREF(packet);
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return context.varyings[0][varyingLoc].get<T>();
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}
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template <typename T>
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tcu::Vector<T, 4> readLineVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx)
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{
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return packet.barycentric[0][fragNdx] * context.varyings[0][varyingLoc].get<T>()
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+ packet.barycentric[1][fragNdx] * context.varyings[1][varyingLoc].get<T>();
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}
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template <typename T>
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tcu::Vector<T, 4> readTriangleVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx)
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{
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return packet.barycentric[0][fragNdx] * context.varyings[0][varyingLoc].get<T>()
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+ packet.barycentric[1][fragNdx] * context.varyings[1][varyingLoc].get<T>()
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+ packet.barycentric[2][fragNdx] * context.varyings[2][varyingLoc].get<T>();
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}
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template <typename T>
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tcu::Vector<T, 4> readVarying (const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc, int fragNdx)
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{
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if (context.varyings[1] == DE_NULL) return readPointVarying<T> (packet, context, varyingLoc, fragNdx);
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if (context.varyings[2] == DE_NULL) return readLineVarying<T> (packet, context, varyingLoc, fragNdx);
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return readTriangleVarying<T> (packet, context, varyingLoc, fragNdx);
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}
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// Derivative
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template <typename T, int Size>
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void dFdxLocal (tcu::Vector<T, Size> outFragmentdFdx[4], const tcu::Vector<T, Size> func[4])
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{
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const tcu::Vector<T, Size> dFdx[2] =
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{
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func[1] - func[0],
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func[3] - func[2]
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};
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outFragmentdFdx[0] = dFdx[0];
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outFragmentdFdx[1] = dFdx[0];
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outFragmentdFdx[2] = dFdx[1];
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outFragmentdFdx[3] = dFdx[1];
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}
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template <typename T, int Size>
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void dFdyLocal (tcu::Vector<T, Size> outFragmentdFdy[4], const tcu::Vector<T, Size> func[4])
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{
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const tcu::Vector<T, Size> dFdy[2] =
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{
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func[2] - func[0],
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func[3] - func[1]
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};
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outFragmentdFdy[0] = dFdy[0];
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outFragmentdFdy[1] = dFdy[1];
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outFragmentdFdy[2] = dFdy[0];
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outFragmentdFdy[3] = dFdy[1];
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}
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template <typename T>
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inline void dFdxVarying (tcu::Vector<T, 4> outFragmentdFdx[4], const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc)
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{
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const tcu::Vector<T, 4> func[4] =
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{
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readVarying<T>(packet, context, varyingLoc, 0),
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readVarying<T>(packet, context, varyingLoc, 1),
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readVarying<T>(packet, context, varyingLoc, 2),
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readVarying<T>(packet, context, varyingLoc, 3),
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};
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dFdxLocal(outFragmentdFdx, func);
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}
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template <typename T>
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inline void dFdyVarying (tcu::Vector<T, 4> outFragmentdFdy[4], const FragmentPacket& packet, const FragmentShadingContext& context, int varyingLoc)
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{
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const tcu::Vector<T, 4> func[4] =
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{
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readVarying<T>(packet, context, varyingLoc, 0),
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readVarying<T>(packet, context, varyingLoc, 1),
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readVarying<T>(packet, context, varyingLoc, 2),
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readVarying<T>(packet, context, varyingLoc, 3),
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};
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dFdyLocal(outFragmentdFdy, func);
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}
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// Fragent depth
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inline float readFragmentDepth (const FragmentShadingContext& context, int packetNdx, int fragNdx, int sampleNdx)
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{
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// Reading or writing to fragment depth values while there is no depth buffer is legal but not supported by rr
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DE_ASSERT(context.fragmentDepths);
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return context.fragmentDepths[(packetNdx * 4 + fragNdx) * context.numSamples + sampleNdx];
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}
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inline void writeFragmentDepth (const FragmentShadingContext& context, int packetNdx, int fragNdx, int sampleNdx, float depthValue)
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{
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// Reading or writing to fragment depth values while there is no depth buffer is legal but not supported by rr
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DE_ASSERT(context.fragmentDepths);
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context.fragmentDepths[(packetNdx * 4 + fragNdx) * context.numSamples + sampleNdx] = depthValue;
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}
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} // rr
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#endif // _RRSHADINGCONTEXT_HPP
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