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/*
* Copyright © 2012 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.
*/
/**
* \file clear.cpp
*
* Verify that the implementation ignores multisample fragment
* operations when performing clears.
*
* This test checks that the following state variables (from GL 3.0
* section 4.1.3 "Multisample Fragment Operations") do not apply when
* performing clears:
*
* - GL_SAMPLE_ALPHA_TO_COVERAGE
*
* - GL_SAMPLE_ALPHA_TO_ONE
*
* - GL_SAMPLE_COVERAGE
*
* - GL_SAMPLE_COVERAGE_VALUE
*
* - GL_SAMPLE_COVERAGE_INVERT
*
* The test operates by setting the above state variables in a way
* that would reduce the sample coverage (for normal GL draw
* operations). Then it performs a glClear() and verifies that all
* samples of all pixels were cleared.
*
* The test can be run in 3 modes: color, depth, and stencil.
*
* In depth and stencil modes, extra work is required to verify that
* all samples are properly cleared. Since a typical MSAA resolve
* retains only one sample from each pixel for the depth and stencil
* buffers, we need to convert depth/stencil values into colors, then
* blit to the screen and check that the resulting color is correct.
* The extra work of converting depth/stencil values into colors is
* done using the ManifestDepth and ManifestStencil programs from
* common.h.
*/
#include "common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = 256;
config.window_height = 256;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_ALPHA;
PIGLIT_GL_TEST_CONFIG_END
namespace {
const int pattern_width = 256; const int pattern_height = 256;
Fbo multisampled_fbo;
ManifestProgram *manifest_program = NULL;
GLbitfield buffer_to_test;
void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <num_samples> <buffer_type>\n"
" where <buffer_type> is one of:\n"
" color\n"
" depth\n"
" stencil\n",
prog_name);
piglit_report_result(PIGLIT_FAIL);
}
extern "C" void
piglit_init(int argc, char **argv)
{
if (argc != 3)
print_usage_and_exit(argv[0]);
/* 1st arg: num_samples */
char *endptr = NULL;
int num_samples = strtol(argv[1], &endptr, 0);
if (endptr != argv[1] + strlen(argv[1]))
print_usage_and_exit(argv[0]);
/* 2nd arg: buffer_type */
if (strcmp(argv[2], "color") == 0) {
buffer_to_test = GL_COLOR_BUFFER_BIT;
} else if (strcmp(argv[2], "depth") == 0) {
buffer_to_test = GL_DEPTH_BUFFER_BIT;
manifest_program = new ManifestDepth();
} else if (strcmp(argv[2], "stencil") == 0) {
buffer_to_test = GL_STENCIL_BUFFER_BIT;
manifest_program = new ManifestStencil();
} else {
print_usage_and_exit(argv[0]);
}
piglit_require_gl_version(30);
/* Skip the test if num_samples > GL_MAX_SAMPLES */
GLint max_samples;
glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
if (num_samples > max_samples)
piglit_report_result(PIGLIT_SKIP);
multisampled_fbo.setup(FboConfig(num_samples, pattern_width,
pattern_height));
if (manifest_program)
manifest_program->compile();
if (!piglit_check_gl_error(GL_NO_ERROR))
piglit_report_result(PIGLIT_FAIL);
}
extern "C" enum piglit_result
piglit_display()
{
bool pass = true;
/* Clear all buffers of the multisampled fbo to default values
* (color={0,0,0,0}, depth=1, stencil=0), with no special
* coverage settings set.
*/
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
multisampled_fbo.set_viewport();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT |
GL_STENCIL_BUFFER_BIT);
/* Set all the clear values to non-default settings. We use
* an alpha value other than 1.0 so verify that
* GL_SAMPLE_ALPHA_TO_COVERAGE and GL_SAMPLE_ALPHA_TO_ONE
* don't take effect.
*/
glClearColor(1.0, 1.0, 1.0, 0.5);
glClearDepth(0.5);
glClearStencil(1);
/* Enable the mulitsample fragment operations that glClear()
* is supposed to ignore.
*/
glEnable(GL_SAMPLE_COVERAGE);
glSampleCoverage(0.5, GL_TRUE);
glEnable(GL_SAMPLE_ALPHA_TO_COVERAGE);
glEnable(GL_SAMPLE_ALPHA_TO_ONE);
/* Clear the buffer under test. */
glClear(buffer_to_test);
/* Reset the multisample fragment operations and clear values
* to their default settings.
*/
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearDepth(1.0);
glClearStencil(0);
glDisable(GL_SAMPLE_COVERAGE);
glDisable(GL_SAMPLE_ALPHA_TO_COVERAGE);
glDisable(GL_SAMPLE_ALPHA_TO_ONE);
/* If we are testing the depth or stencil buffer, use
* manifest_program to convert depth/stencil values to
* colors.
*/
if (manifest_program)
manifest_program->run();
/* Blit the color values from the multisampled FBO to the
* screen, forcing a resolve.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlitFramebuffer(0, 0, pattern_width, pattern_height,
0, 0, pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Figure out what color we expect to be drawn, depending on
* which buffer was tested:
*
* - If we tested the color buffer, we should have gotten the
* clear color back verbatim.
*
* - If we tested the depth buffer, we should have gotten red,
* since the ManifestDepth program converts a depth value of
* 0.5 to red.
*
* - If we tested the stencil buffer, we should have gotten
* blue, since the ManifestStencil program converts a
* stencil value of 1 to blue.
*/
static const float expected_color[4] = { 1.0, 1.0, 1.0, 0.5 };
static const float expected_depth[4] = { 1.0, 0.0, 0.0, 1.0 };
static const float expected_stencil[4] = { 0.0, 0.0, 1.0, 1.0 };
const float *expected = NULL;
switch (buffer_to_test) {
case GL_COLOR_BUFFER_BIT:
expected = expected_color;
break;
case GL_DEPTH_BUFFER_BIT:
expected = expected_depth;
break;
case GL_STENCIL_BUFFER_BIT:
expected = expected_stencil;
break;
default:
printf("Unexpected value in buffer_to_test\n");
piglit_report_result(PIGLIT_FAIL);
break;
}
/* Test that the appropriate color was drawn. Since the
* resolve operation averaged together all the color samples
* corresponding to each pixel, this effectively verifies that
* all samples of every pixel were correctly cleared.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height,
expected) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
} /* Anonymous namespace */
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