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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 "common.h"
/**
* \file upsample.cpp
*
* Verify the accuracy of upsampling from a non-MSAA buffer to an MSAA
* buffer.
*
* This test operates by drawing a test image in the window system
* framebuffer (which is non-MSAA), and then blitting it to an MSAA
* framebuffer, forcing the implementation to upsample it.
*
* To verify that upsampling has properly replicated each pixel value
* in each of its samples, we blit from the MSAA buffer back to the
* window system framebuffer. This causes all of the samples for each
* pixel to be blended, so if any of the pixels were not upsampled
* correctly, we would expect the downsampled image to be different
* from the original image.
*
* When testing depth and stencil buffers, we need to modify this
* procedure slightly, since downsampling depth and stencil buffers
* doesn't cause the pixels to be blended. So, after the first blit,
* we execute a "manifest pass" to translate the depth or stencil
* image into a color image. This is done independently in both the
* MSAA and non-MSAA buffers. Then we downsample the resulting color
* image as before.
*
* Note: this test relies on proper functioning of the MSAA buffer and
* the downsample blit. These are already adequately tested by
* accuracy.cpp.
*/
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_VISUAL_DEPTH | PIGLIT_GL_VISUAL_STENCIL;
PIGLIT_GL_TEST_CONFIG_END
const int pattern_width = 256; const int pattern_height = 256;
Fbo multisample_fbo;
TestPattern *test_pattern = NULL;
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"
" stencil\n"
" depth\n",
prog_name);
piglit_report_result(PIGLIT_FAIL);
}
void
piglit_init(int argc, char **argv)
{
int num_samples;
if (argc < 3)
print_usage_and_exit(argv[0]);
{
char *endptr = NULL;
num_samples = strtol(argv[1], &endptr, 0);
if (endptr != argv[1] + strlen(argv[1]))
print_usage_and_exit(argv[0]);
}
piglit_require_gl_version(30);
piglit_require_GLSL_version(130);
/* 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);
if (strcmp(argv[2], "color") == 0) {
test_pattern = new Triangles();
buffer_to_test = GL_COLOR_BUFFER_BIT;
} else if (strcmp(argv[2], "depth") == 0) {
test_pattern = new DepthSunburst();
manifest_program = new ManifestDepth();
buffer_to_test = GL_DEPTH_BUFFER_BIT;
} else if (strcmp(argv[2], "stencil") == 0) {
test_pattern = new StencilSunburst();
manifest_program = new ManifestStencil();
buffer_to_test = GL_STENCIL_BUFFER_BIT;
} else {
print_usage_and_exit(argv[0]);
}
test_pattern->compile();
if (manifest_program)
manifest_program->compile();
multisample_fbo.setup(FboConfig(num_samples, pattern_width,
pattern_height));
}
enum piglit_result
piglit_display()
{
bool pass = true;
/* Draw the full test pattern on the right half of the piglit
* window, as a reference image.
*
* To map the full test pattern to the right half of the
* windows, we need a projection matrix that multiplies the X
* coordinate by 0.5 and adds 0.5.
*/
float proj[4][4] = {
{ 0.5, 0, 0, 0.5 },
{ 0, 1, 0, 0 },
{ 0, 0, 1, 0 },
{ 0, 0, 0, 1 }
};
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glViewport(0, 0, piglit_width, piglit_height);
test_pattern->draw(proj);
/* Blit the test pattern to multisample_fbo, forcing the
* implementation to upsample it.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisample_fbo.handle);
glBlitFramebuffer(pattern_width, 0, pattern_width*2, pattern_height,
0, 0, pattern_width, pattern_height,
buffer_to_test, GL_NEAREST);
if (manifest_program) {
/* Manifest the test pattern in the main framebuffer. */
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
manifest_program->run();
/* Manifest the test pattern in the multisample
* framebuffer.
*/
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisample_fbo.handle);
multisample_fbo.set_viewport();
manifest_program->run();
}
/* Blit the manifested test pattern to the left half of the
* main framebuffer, forcing the implementation to downsample
* it.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, multisample_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);
/* Check that the left and right halves of the screen match.
* If they don't, then there is either a problem with
* upsampling or downsampling. Since downsampling is already
* tested by accuracy.cpp, we'll assume that any problem we
* see here is due to upsampling.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
pass = piglit_probe_rect_halves_equal_rgba(0, 0, piglit_width,
piglit_height) && pass;
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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