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/*
* Copyright © 2011 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "piglit-util-gl.h"
/**
* @file discard-copypixels.c
*
* Tests that GL_RASTERIZER_DISCARD appropriately affects glCopyPixels().
*
* From the EXT_transform_feedback spec:
*
* "Primitives can be optionally discarded before rasterization by
* calling Enable and Disable with RASTERIZER_DISCARD_EXT. When
* enabled, primitives are discared right before the
* rasterization stage, but after the optional transform feedback
* stage. When disabled, primitives are passed through to the
* rasterization stage to be processed
* normally. RASTERIZER_DISCARD_EXT applies to the DrawPixels,
* CopyPixels, Bitmap, Clear and Accum commands as well."
*/
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
config.khr_no_error_support = PIGLIT_NO_ERRORS;
PIGLIT_GL_TEST_CONFIG_END
enum piglit_result
piglit_display(void)
{
bool pass = true;
float green[4] = {0.0, 1.0, 0.0, 0.0};
/* Clear red. */
glClearColor(1.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
/* Draw top half of screen green. */
glColor4f(0.0, 1.0, 0.0, 0.0);
piglit_draw_rect(-1, 0, 2, 1);
/* Discard a copy over the bottom red over the top green. */
glEnable(GL_RASTERIZER_DISCARD);
glRasterPos2i(-1, 0);
glCopyPixels(0, 0, piglit_width, piglit_height / 2, GL_COLOR);
/* Don't discard a copy of the green over the remaining red. */
glDisable(GL_RASTERIZER_DISCARD);
glRasterPos2i(-1, -1);
glCopyPixels(0, piglit_height / 2, piglit_width, piglit_height / 2,
GL_COLOR);
pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
piglit_require_transform_feedback();
}
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