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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 sample-alpha-to-coverage.cpp
*
* Verify sample alpha to coverage with multisample FBO
*
* When rendering to multisample FBO, fragment's alpha value should be
* used to determine the coverage value.
*
* This test operates by drawing a pattern in multisample FBO to generate
* reference and test image. Reference image is drawn to right half of window
* system frame buffer and test image to left half.
*
* Compute the expected color / depth values.
*
* Probe color / depth buffer 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 = 256;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_ALPHA;
PIGLIT_GL_TEST_CONFIG_END
static GLenum buffer_to_test;
void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <num_samples> <test_type>\n"
" where <test_type> is one of:\n"
" color\n"
" depth\n",
prog_name);
piglit_report_result(PIGLIT_FAIL);
}
void
piglit_init(int argc, char **argv)
{
const int num_attachments = 1;
int samples;
piglit_require_gl_version(30);
if (argc < 3)
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]);
}
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;
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_ALWAYS);
} else
print_usage_and_exit(argv[0]);
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,
buffer_to_test,
GL_RGBA);
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 here doesn't represent an expected image.
* Reference image is drawn only to visualize the image difference
* caused by enabling sample_alpha_to_coverage in test image.
*/
if(buffer_to_test == GL_COLOR_BUFFER_BIT)
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 all the test image 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.
*/
if(buffer_to_test == GL_COLOR_BUFFER_BIT)
pass = probe_framebuffer_color() && pass;
else if (buffer_to_test == GL_DEPTH_BUFFER_BIT)
pass = probe_framebuffer_depth() && pass;
/* Free the memory allocated for data arrays */
free_data_arrays();
if (!piglit_automatic && buffer_to_test == GL_COLOR_BUFFER_BIT)
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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