/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 2009 VMware, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file viewport.c
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* glViewport and glDepthRange functions.
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*/
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#include "context.h"
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#include "enums.h"
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#include "macros.h"
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#include "mtypes.h"
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#include "viewport.h"
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static void
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clamp_viewport(struct gl_context *ctx, GLfloat *x, GLfloat *y,
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GLfloat *width, GLfloat *height)
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{
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/* clamp width and height to the implementation dependent range */
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*width = MIN2(*width, (GLfloat) ctx->Const.MaxViewportWidth);
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*height = MIN2(*height, (GLfloat) ctx->Const.MaxViewportHeight);
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/* The GL_ARB_viewport_array spec says:
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*
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* "The location of the viewport's bottom-left corner, given by (x,y),
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* are clamped to be within the implementation-dependent viewport
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* bounds range. The viewport bounds range [min, max] tuple may be
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* determined by calling GetFloatv with the symbolic constant
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* VIEWPORT_BOUNDS_RANGE (see section 6.1)."
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*/
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if (_mesa_has_ARB_viewport_array(ctx) ||
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_mesa_has_OES_viewport_array(ctx)) {
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*x = CLAMP(*x,
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ctx->Const.ViewportBounds.Min, ctx->Const.ViewportBounds.Max);
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*y = CLAMP(*y,
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ctx->Const.ViewportBounds.Min, ctx->Const.ViewportBounds.Max);
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}
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}
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static void
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set_viewport_no_notify(struct gl_context *ctx, unsigned idx,
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GLfloat x, GLfloat y,
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GLfloat width, GLfloat height)
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{
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if (ctx->ViewportArray[idx].X == x &&
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ctx->ViewportArray[idx].Width == width &&
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ctx->ViewportArray[idx].Y == y &&
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ctx->ViewportArray[idx].Height == height)
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return;
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FLUSH_VERTICES(ctx, ctx->DriverFlags.NewViewport ? 0 : _NEW_VIEWPORT);
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ctx->NewDriverState |= ctx->DriverFlags.NewViewport;
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ctx->ViewportArray[idx].X = x;
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ctx->ViewportArray[idx].Width = width;
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ctx->ViewportArray[idx].Y = y;
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ctx->ViewportArray[idx].Height = height;
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}
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struct gl_viewport_inputs {
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GLfloat X, Y; /**< position */
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GLfloat Width, Height; /**< size */
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};
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struct gl_depthrange_inputs {
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GLdouble Near, Far; /**< Depth buffer range */
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};
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static void
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viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei width,
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GLsizei height)
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{
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struct gl_viewport_inputs input = { x, y, width, height };
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/* Clamp the viewport to the implementation dependent values. */
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clamp_viewport(ctx, &input.X, &input.Y, &input.Width, &input.Height);
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/* The GL_ARB_viewport_array spec says:
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*
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* "Viewport sets the parameters for all viewports to the same values
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* and is equivalent (assuming no errors are generated) to:
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*
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* for (uint i = 0; i < MAX_VIEWPORTS; i++)
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* ViewportIndexedf(i, 1, (float)x, (float)y, (float)w, (float)h);"
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*
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* Set all of the viewports supported by the implementation, but only
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* signal the driver once at the end.
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*/
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for (unsigned i = 0; i < ctx->Const.MaxViewports; i++)
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set_viewport_no_notify(ctx, i, input.X, input.Y, input.Width, input.Height);
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if (ctx->Driver.Viewport)
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ctx->Driver.Viewport(ctx);
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}
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/**
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* Set the viewport.
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* \sa Called via glViewport() or display list execution.
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*
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* Flushes the vertices and calls _mesa_set_viewport() with the given
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* parameters.
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*/
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void GLAPIENTRY
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_mesa_Viewport_no_error(GLint x, GLint y, GLsizei width, GLsizei height)
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{
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GET_CURRENT_CONTEXT(ctx);
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viewport(ctx, x, y, width, height);
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}
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void GLAPIENTRY
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_mesa_Viewport(GLint x, GLint y, GLsizei width, GLsizei height)
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{
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GET_CURRENT_CONTEXT(ctx);
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glViewport %d %d %d %d\n", x, y, width, height);
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if (width < 0 || height < 0) {
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_mesa_error(ctx, GL_INVALID_VALUE,
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"glViewport(%d, %d, %d, %d)", x, y, width, height);
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return;
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}
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viewport(ctx, x, y, width, height);
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}
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/**
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* Set new viewport parameters and update derived state.
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* Usually called from _mesa_Viewport().
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*
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* \param ctx GL context.
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* \param idx Index of the viewport to be updated.
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* \param x, y coordinates of the lower left corner of the viewport rectangle.
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* \param width width of the viewport rectangle.
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* \param height height of the viewport rectangle.
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*/
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void
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_mesa_set_viewport(struct gl_context *ctx, unsigned idx, GLfloat x, GLfloat y,
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GLfloat width, GLfloat height)
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{
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clamp_viewport(ctx, &x, &y, &width, &height);
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set_viewport_no_notify(ctx, idx, x, y, width, height);
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if (ctx->Driver.Viewport)
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ctx->Driver.Viewport(ctx);
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}
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static void
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viewport_array(struct gl_context *ctx, GLuint first, GLsizei count,
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struct gl_viewport_inputs *inputs)
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{
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for (GLsizei i = 0; i < count; i++) {
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clamp_viewport(ctx, &inputs[i].X, &inputs[i].Y,
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&inputs[i].Width, &inputs[i].Height);
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set_viewport_no_notify(ctx, i + first, inputs[i].X, inputs[i].Y,
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inputs[i].Width, inputs[i].Height);
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}
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if (ctx->Driver.Viewport)
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ctx->Driver.Viewport(ctx);
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}
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void GLAPIENTRY
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_mesa_ViewportArrayv_no_error(GLuint first, GLsizei count, const GLfloat *v)
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{
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GET_CURRENT_CONTEXT(ctx);
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struct gl_viewport_inputs *p = (struct gl_viewport_inputs *)v;
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viewport_array(ctx, first, count, p);
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}
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void GLAPIENTRY
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_mesa_ViewportArrayv(GLuint first, GLsizei count, const GLfloat *v)
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{
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int i;
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struct gl_viewport_inputs *p = (struct gl_viewport_inputs *)v;
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GET_CURRENT_CONTEXT(ctx);
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glViewportArrayv %d %d\n", first, count);
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if ((first + count) > ctx->Const.MaxViewports) {
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_mesa_error(ctx, GL_INVALID_VALUE,
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"glViewportArrayv: first (%d) + count (%d) > MaxViewports "
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"(%d)",
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first, count, ctx->Const.MaxViewports);
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return;
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}
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/* Verify width & height */
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for (i = 0; i < count; i++) {
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if (p[i].Width < 0 || p[i].Height < 0) {
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_mesa_error(ctx, GL_INVALID_VALUE,
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"glViewportArrayv: index (%d) width or height < 0 "
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"(%f, %f)",
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i + first, p[i].Width, p[i].Height);
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return;
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}
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}
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viewport_array(ctx, first, count, p);
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}
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static void
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viewport_indexed_err(struct gl_context *ctx, GLuint index, GLfloat x, GLfloat y,
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GLfloat w, GLfloat h, const char *function)
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{
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "%s(%d, %f, %f, %f, %f)\n",
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function, index, x, y, w, h);
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if (index >= ctx->Const.MaxViewports) {
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_mesa_error(ctx, GL_INVALID_VALUE,
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"%s: index (%d) >= MaxViewports (%d)",
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function, index, ctx->Const.MaxViewports);
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return;
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}
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/* Verify width & height */
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if (w < 0 || h < 0) {
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_mesa_error(ctx, GL_INVALID_VALUE,
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"%s: index (%d) width or height < 0 (%f, %f)",
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function, index, w, h);
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return;
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}
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_mesa_set_viewport(ctx, index, x, y, w, h);
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}
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void GLAPIENTRY
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_mesa_ViewportIndexedf_no_error(GLuint index, GLfloat x, GLfloat y,
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GLfloat w, GLfloat h)
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{
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GET_CURRENT_CONTEXT(ctx);
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_mesa_set_viewport(ctx, index, x, y, w, h);
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}
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void GLAPIENTRY
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_mesa_ViewportIndexedf(GLuint index, GLfloat x, GLfloat y,
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GLfloat w, GLfloat h)
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{
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GET_CURRENT_CONTEXT(ctx);
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viewport_indexed_err(ctx, index, x, y, w, h, "glViewportIndexedf");
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}
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void GLAPIENTRY
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_mesa_ViewportIndexedfv_no_error(GLuint index, const GLfloat *v)
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{
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GET_CURRENT_CONTEXT(ctx);
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_mesa_set_viewport(ctx, index, v[0], v[1], v[2], v[3]);
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}
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void GLAPIENTRY
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_mesa_ViewportIndexedfv(GLuint index, const GLfloat *v)
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{
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GET_CURRENT_CONTEXT(ctx);
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viewport_indexed_err(ctx, index, v[0], v[1], v[2], v[3],
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"glViewportIndexedfv");
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}
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static void
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set_depth_range_no_notify(struct gl_context *ctx, unsigned idx,
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GLclampd nearval, GLclampd farval)
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{
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if (ctx->ViewportArray[idx].Near == nearval &&
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ctx->ViewportArray[idx].Far == farval)
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return;
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/* The depth range is needed by program state constants. */
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FLUSH_VERTICES(ctx, _NEW_VIEWPORT);
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ctx->NewDriverState |= ctx->DriverFlags.NewViewport;
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ctx->ViewportArray[idx].Near = CLAMP(nearval, 0.0, 1.0);
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ctx->ViewportArray[idx].Far = CLAMP(farval, 0.0, 1.0);
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}
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void
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_mesa_set_depth_range(struct gl_context *ctx, unsigned idx,
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GLclampd nearval, GLclampd farval)
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{
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set_depth_range_no_notify(ctx, idx, nearval, farval);
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if (ctx->Driver.DepthRange)
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ctx->Driver.DepthRange(ctx);
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}
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/**
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* Called by glDepthRange
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*
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* \param nearval specifies the Z buffer value which should correspond to
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* the near clip plane
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* \param farval specifies the Z buffer value which should correspond to
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* the far clip plane
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*/
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void GLAPIENTRY
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_mesa_DepthRange(GLclampd nearval, GLclampd farval)
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{
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unsigned i;
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GET_CURRENT_CONTEXT(ctx);
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if (MESA_VERBOSE&VERBOSE_API)
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_mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval);
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/* The GL_ARB_viewport_array spec says:
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*
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* "DepthRange sets the depth range for all viewports to the same
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* values and is equivalent (assuming no errors are generated) to:
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*
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* for (uint i = 0; i < MAX_VIEWPORTS; i++)
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* DepthRangeIndexed(i, n, f);"
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*
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* Set the depth range for all of the viewports supported by the
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* implementation, but only signal the driver once at the end.
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*/
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for (i = 0; i < ctx->Const.MaxViewports; i++)
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set_depth_range_no_notify(ctx, i, nearval, farval);
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if (ctx->Driver.DepthRange) {
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ctx->Driver.DepthRange(ctx);
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}
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}
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void GLAPIENTRY
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_mesa_DepthRangef(GLclampf nearval, GLclampf farval)
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{
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_mesa_DepthRange(nearval, farval);
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}
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/**
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* Update a range DepthRange values
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*
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* \param first starting array index
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* \param count count of DepthRange items to update
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* \param v pointer to memory containing
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* GLclampd near and far clip-plane values
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*/
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static ALWAYS_INLINE void
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depth_range_arrayv(struct gl_context *ctx, GLuint first, GLsizei count,
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const struct gl_depthrange_inputs *const inputs)
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{
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for (GLsizei i = 0; i < count; i++)
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set_depth_range_no_notify(ctx, i + first, inputs[i].Near, inputs[i].Far);
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if (ctx->Driver.DepthRange)
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ctx->Driver.DepthRange(ctx);
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}
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void GLAPIENTRY
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_mesa_DepthRangeArrayv_no_error(GLuint first, GLsizei count, const GLclampd *v)
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{
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GET_CURRENT_CONTEXT(ctx);
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const struct gl_depthrange_inputs *const p =
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(struct gl_depthrange_inputs *)v;
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depth_range_arrayv(ctx, first, count, p);
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}
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void GLAPIENTRY
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_mesa_DepthRangeArrayv(GLuint first, GLsizei count, const GLclampd *v)
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{
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const struct gl_depthrange_inputs *const p =
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(struct gl_depthrange_inputs *) v;
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GET_CURRENT_CONTEXT(ctx);
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glDepthRangeArrayv %d %d\n", first, count);
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if ((first + count) > ctx->Const.MaxViewports) {
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_mesa_error(ctx, GL_INVALID_VALUE,
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"glDepthRangev: first (%d) + count (%d) >= MaxViewports (%d)",
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first, count, ctx->Const.MaxViewports);
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return;
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}
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depth_range_arrayv(ctx, first, count, p);
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}
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void GLAPIENTRY
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_mesa_DepthRangeArrayfvOES(GLuint first, GLsizei count, const GLfloat *v)
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{
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int i;
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GET_CURRENT_CONTEXT(ctx);
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|
if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glDepthRangeArrayfv %d %d\n", first, count);
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if ((first + count) > ctx->Const.MaxViewports) {
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_mesa_error(ctx, GL_INVALID_VALUE,
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"glDepthRangeArrayfv: first (%d) + count (%d) >= MaxViewports (%d)",
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first, count, ctx->Const.MaxViewports);
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return;
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}
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for (i = 0; i < count; i++)
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set_depth_range_no_notify(ctx, i + first, v[i * 2], v[i * 2 + 1]);
|
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if (ctx->Driver.DepthRange)
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ctx->Driver.DepthRange(ctx);
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}
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/**
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* Update a single DepthRange
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*
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* \param index array index to update
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* \param nearval specifies the Z buffer value which should correspond to
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* the near clip plane
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* \param farval specifies the Z buffer value which should correspond to
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* the far clip plane
|
*/
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void GLAPIENTRY
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_mesa_DepthRangeIndexed_no_error(GLuint index, GLclampd nearval,
|
GLclampd farval)
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{
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GET_CURRENT_CONTEXT(ctx);
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_mesa_set_depth_range(ctx, index, nearval, farval);
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}
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|
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void GLAPIENTRY
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_mesa_DepthRangeIndexed(GLuint index, GLclampd nearval, GLclampd farval)
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{
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GET_CURRENT_CONTEXT(ctx);
|
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glDepthRangeIndexed(%d, %f, %f)\n",
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index, nearval, farval);
|
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if (index >= ctx->Const.MaxViewports) {
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_mesa_error(ctx, GL_INVALID_VALUE,
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"glDepthRangeIndexed: index (%d) >= MaxViewports (%d)",
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index, ctx->Const.MaxViewports);
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return;
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}
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_mesa_set_depth_range(ctx, index, nearval, farval);
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}
|
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void GLAPIENTRY
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_mesa_DepthRangeIndexedfOES(GLuint index, GLfloat nearval, GLfloat farval)
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{
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_mesa_DepthRangeIndexed(index, nearval, farval);
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}
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/**
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* Initialize the context viewport attribute group.
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* \param ctx the GL context.
|
*/
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void _mesa_init_viewport(struct gl_context *ctx)
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{
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unsigned i;
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ctx->Transform.ClipOrigin = GL_LOWER_LEFT;
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ctx->Transform.ClipDepthMode = GL_NEGATIVE_ONE_TO_ONE;
|
|
/* Note: ctx->Const.MaxViewports may not have been set by the driver yet,
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* so just initialize all of them.
|
*/
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for (i = 0; i < MAX_VIEWPORTS; i++) {
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/* Viewport group */
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ctx->ViewportArray[i].X = 0;
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ctx->ViewportArray[i].Y = 0;
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ctx->ViewportArray[i].Width = 0;
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ctx->ViewportArray[i].Height = 0;
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ctx->ViewportArray[i].Near = 0.0;
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ctx->ViewportArray[i].Far = 1.0;
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}
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}
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|
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static ALWAYS_INLINE void
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clip_control(struct gl_context *ctx, GLenum origin, GLenum depth, bool no_error)
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{
|
if (ctx->Transform.ClipOrigin == origin &&
|
ctx->Transform.ClipDepthMode == depth)
|
return;
|
|
if (!no_error &&
|
origin != GL_LOWER_LEFT && origin != GL_UPPER_LEFT) {
|
_mesa_error(ctx, GL_INVALID_ENUM, "glClipControl");
|
return;
|
}
|
|
if (!no_error &&
|
depth != GL_NEGATIVE_ONE_TO_ONE && depth != GL_ZERO_TO_ONE) {
|
_mesa_error(ctx, GL_INVALID_ENUM, "glClipControl");
|
return;
|
}
|
|
/* Affects transform state and the viewport transform */
|
FLUSH_VERTICES(ctx, ctx->DriverFlags.NewClipControl ? 0 :
|
_NEW_TRANSFORM | _NEW_VIEWPORT);
|
ctx->NewDriverState |= ctx->DriverFlags.NewClipControl;
|
|
if (ctx->Transform.ClipOrigin != origin) {
|
ctx->Transform.ClipOrigin = origin;
|
|
/* Affects the winding order of the front face. */
|
if (ctx->DriverFlags.NewPolygonState)
|
ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
|
else
|
ctx->NewState |= _NEW_POLYGON;
|
|
if (ctx->Driver.FrontFace)
|
ctx->Driver.FrontFace(ctx, ctx->Polygon.FrontFace);
|
}
|
|
if (ctx->Transform.ClipDepthMode != depth) {
|
ctx->Transform.ClipDepthMode = depth;
|
|
if (ctx->Driver.DepthRange)
|
ctx->Driver.DepthRange(ctx);
|
}
|
}
|
|
|
void GLAPIENTRY
|
_mesa_ClipControl_no_error(GLenum origin, GLenum depth)
|
{
|
GET_CURRENT_CONTEXT(ctx);
|
clip_control(ctx, origin, depth, true);
|
}
|
|
|
void GLAPIENTRY
|
_mesa_ClipControl(GLenum origin, GLenum depth)
|
{
|
GET_CURRENT_CONTEXT(ctx);
|
|
if (MESA_VERBOSE & VERBOSE_API)
|
_mesa_debug(ctx, "glClipControl(%s, %s)\n",
|
_mesa_enum_to_string(origin),
|
_mesa_enum_to_string(depth));
|
|
ASSERT_OUTSIDE_BEGIN_END(ctx);
|
|
if (!ctx->Extensions.ARB_clip_control) {
|
_mesa_error(ctx, GL_INVALID_OPERATION, "glClipControl");
|
return;
|
}
|
|
clip_control(ctx, origin, depth, false);
|
}
|
|
/**
|
* Computes the scaling and the translation part of the
|
* viewport transform matrix of the \param i-th viewport
|
* and writes that into \param scale and \param translate.
|
*/
|
void
|
_mesa_get_viewport_xform(struct gl_context *ctx, unsigned i,
|
float scale[3], float translate[3])
|
{
|
float x = ctx->ViewportArray[i].X;
|
float y = ctx->ViewportArray[i].Y;
|
float half_width = 0.5f * ctx->ViewportArray[i].Width;
|
float half_height = 0.5f * ctx->ViewportArray[i].Height;
|
double n = ctx->ViewportArray[i].Near;
|
double f = ctx->ViewportArray[i].Far;
|
|
scale[0] = half_width;
|
translate[0] = half_width + x;
|
if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT) {
|
scale[1] = -half_height;
|
} else {
|
scale[1] = half_height;
|
}
|
translate[1] = half_height + y;
|
|
if (ctx->Transform.ClipDepthMode == GL_NEGATIVE_ONE_TO_ONE) {
|
scale[2] = 0.5 * (f - n);
|
translate[2] = 0.5 * (n + f);
|
} else {
|
scale[2] = f - n;
|
translate[2] = n;
|
}
|
}
|
