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/*
* Copyright © 2016 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-write.cpp
*
* Verify sample alpha to coverage with multiple draw buffers when nothing
* is written to draw buffer zero.
*
* When nothing is written to draw buffer zero, GL_SAMPLE_ALPHA_TO_COVERAGE
* usage shouldn't hang the system. The alpha value used to determine
* coverage will be undefined which will result in to pixels with undefined
* colors. So, pixels can't be probed for color in this test.
*
* From OpenGL 2.1 specification:
* "If a fragment shader writes to neither gl FragColor nor gl FragData,
* the values of the fragment colors following shader execution are
* undefined, and may differ for each fragment color."
*
* It is a significant edge case for i965 driver.
*/
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 21;
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_extension("GL_ARB_framebuffer_object");
piglit_require_extension("GL_ARB_vertex_array_object");
piglit_require_extension("GL_EXT_framebuffer_multisample");
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 < 1 || 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_RGBA /* color_buffer_zero_format */);
shader_compile(true /* sample_alpha_to_coverage */,
false /* dual_src_blend */,
false /* frag_out_zero_write */);
}
enum piglit_result
piglit_display()
{
bool pass;
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
allocate_data_arrays();
draw_test_image(true /* sample_alpha_to_coverage */,
false /* sample_alpha_to_one */);
pass = piglit_check_gl_error(GL_NO_ERROR);
/* Free the memory allocated for data arrays */
free_data_arrays();
if (!piglit_automatic)
piglit_present_results();
/* The fragment colors are undefined in this test. So, we can't probe
* the pixels. If test executes to completion without error, return
* PIGLIT_PASS.
*/
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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