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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.
*/
#include "draw-buffers-common.h"
/**
* \file alpha-to-coverage-no-draw-buffer-zero.cpp
*
* Verify sample alpha to coverage with multiple draw buffers when nothing
* is bound to draw buffer zero.
*
* When nothing is bound to draw buffer zero, GL_SAMPLE_ALPHA_TO_COVERAGE
* still needs to work properly for rest of the draw buffers. The alpha value
* used to determine coverage should come from draw buffer zero.
*
* This test operates by drawing a pattern in multisample FBO to generate
* reference and test images for all the draw buffers. Reference images are
* drawn to right half of window system draw buffer and test images to left
* half.
*
* Compute the expected color values for all the draw buffers.
*
* Probe all the draw buffers blitted to downsampled FBO (resolve_fbo) and
* compare against expected color values.
*
* Author: Anuj Phogat <anuj.phogat@gmail.com>
*/
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 512;
config.window_height = 768;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
PIGLIT_GL_TEST_CONFIG_END
void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <num_samples>\n", prog_name);
piglit_report_result(PIGLIT_FAIL);
}
void
piglit_init(int argc, char **argv)
{
int samples;
/* At present fragment shader supports only fixed number of
* attachments (3)
*/
int num_attachments = 3;
if (argc < 2)
print_usage_and_exit(argv[0]);
{
char *endptr = NULL;
samples = strtol(argv[1], &endptr, 0);
if (endptr != argv[1] + strlen(argv[1]))
print_usage_and_exit(argv[0]);
}
piglit_require_gl_version(21);
piglit_require_extension("GL_ARB_framebuffer_object");
piglit_require_extension("GL_ARB_vertex_array_object");
int pattern_width = piglit_width / 2;
int pattern_height = piglit_height / num_attachments;
piglit_ortho_projection(pattern_width,
pattern_height,
GL_TRUE);
/* Skip the test if samples > GL_MAX_SAMPLES */
GLint max_samples;
glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
if (samples > max_samples)
piglit_report_result(PIGLIT_SKIP);
ms_fbo_and_draw_buffers_setup(samples,
pattern_width,
pattern_height,
num_attachments,
GL_COLOR_BUFFER_BIT,
GL_NONE /* color_buffer_zero_format */);
shader_compile(true /* sample_alpha_to_coverage */,
false /* dual_src_blend */);
}
enum piglit_result
piglit_display()
{
bool pass = true;
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
allocate_data_arrays();
/* Reference image drawn when sample_alpha_to_coverage is enabled,
* doesn't represent an expected image. Reference image is drawn only
* to visualize the image difference caused by enabling
* sample_alpha_to_coverage
*/
draw_reference_image(true /* sample_alpha_to_coverage */,
false /* sample_alpha_to_one */);
draw_test_image(true /* sample_alpha_to_coverage */,
false /* sample_alpha_to_one */);
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
/* Probe test images of all the draw_buffers blitted to resolve fbo
* and compare with expected color values. This method of verification
* is appropriate for tests with sample-alpha-to-coverage enabled.
* Possibility of dithering effect when the coverage value is not a
* strict multiple of 1 / num_samples makes image compare (test /
* reference image) unsuitable for this test.
*/
pass = probe_framebuffer_color() && pass;
/* Free the memory allocated for data arrays */
free_data_arrays();
if (!piglit_automatic)
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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