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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 unaligned-blit.cpp
*
* Verify the accuracy of blits involving MSAA buffers when the blit
* coordinates are not aligned to simple powers of two.
*
* This test operates through the use of a sequence of blits that
* might be called a "scrambling blit": a source image (whose size is
* not a power of two) is divided up into tiles (whose size is also
* not a power of two), and these tiles are blitted one at a time from
* the source to the destination buffer, permuting the order of the
* tiles in a deterministic way. The scrambling ensures that we test
* a wide variety of different offsets and coordinate misalignments.
*
* The test performs the following operations: First an unscrambled
* test image is created in a source buffer, which may or may not be
* multisampled. Then a scrambling blit is used to copy it to a
* destination buffer, which also may or may not be multisampled.
* Finally, the destination buffer is blitted to the window system
* framebuffer, using the inverse permutation. This should result in
* an unscrambled test image.
*
* To verify that the test image is correct, we produce a reference
* image by repeating the same operation using ordinary unscrambled
* blits.
*/
const int pattern_size = 245;
const int tile_size = 49;
const int tiles_across = 5;
const int num_tiles = tiles_across * tiles_across;
int piglit_width = pattern_size * 2; int piglit_height = pattern_size;
int piglit_window_mode =
GLUT_DOUBLE | GLUT_RGBA | GLUT_ALPHA | GLUT_DEPTH | GLUT_STENCIL;
const int permutation[num_tiles] = {
10, 5, 6, 17, 3, 11, 16, 21, 14, 24, 23, 8, 15, 18, 0, 12, 9,
4, 22, 19, 20, 2, 7, 13, 1
};
const int inverse_permutation[num_tiles] = {
14, 24, 21, 4, 17, 1, 2, 22, 11, 16, 0, 5, 15, 23, 8, 12, 6,
3, 13, 19, 20, 7, 18, 10, 9
};
Fbo src_fbo;
Fbo dst_fbo;
TestPattern *test_pattern = NULL;
ManifestProgram *manifest_program = NULL;
GLbitfield buffer_to_test;
void
scrambling_blit(const int *permutation)
{
for (int i = 0; i < num_tiles; ++i) {
int src_x = (i % tiles_across) * tile_size;
int src_y = (i / tiles_across) * tile_size;
int dst_x = (permutation[i] % tiles_across) * tile_size;
int dst_y = (permutation[i] / tiles_across) * tile_size;
glBlitFramebuffer(src_x, src_y,
src_x + tile_size, src_y + tile_size,
dst_x, dst_y,
dst_x + tile_size, dst_y + tile_size,
buffer_to_test, GL_NEAREST);
}
}
void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <num_samples> <buffer_type> <blit_type>\n"
" where <buffer_type> is one of:\n"
" color\n"
" stencil\n"
" depth\n"
" and <blit_type> is one of:\n"
" msaa\n"
" upsample\n"
" downsample\n",
prog_name);
piglit_report_result(PIGLIT_FAIL);
}
void
piglit_init(int argc, char **argv)
{
int num_samples;
int src_samples;
int dst_samples;
if (argc < 4)
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);
/* 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]);
}
if (strcmp(argv[3], "msaa") == 0) {
src_samples = dst_samples = num_samples;
} else if (strcmp(argv[3], "upsample") == 0) {
src_samples = 0;
dst_samples = num_samples;
} else if (strcmp(argv[3], "downsample") == 0) {
src_samples = num_samples;
dst_samples = 0;
} else {
print_usage_and_exit(argv[0]);
}
test_pattern->compile();
if (manifest_program)
manifest_program->compile();
src_fbo.init(FboConfig(src_samples, pattern_size, pattern_size));
dst_fbo.init(FboConfig(dst_samples, pattern_size, pattern_size));
}
enum piglit_result
piglit_display()
{
bool pass = true;
/* Draw the test pattern in src_fbo. */
float proj[4][4] = {
{ 1, 0, 0, 0 },
{ 0, 1, 0, 0 },
{ 0, 0, 1, 0 },
{ 0, 0, 0, 1 }
};
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, src_fbo.handle);
src_fbo.set_viewport();
test_pattern->draw(proj);
/* Blit from src_fbo to dst_fbo, scrambling the pattern as we go. */
glBindFramebuffer(GL_READ_FRAMEBUFFER, src_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst_fbo.handle);
scrambling_blit(permutation);
/* Blit from dst_fbo to the left half of the window system
* framebuffer, unscrambling as we go.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, dst_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
scrambling_blit(inverse_permutation);
/* Blit from src_fbo to dst_fbo with no scrambling. */
glBindFramebuffer(GL_READ_FRAMEBUFFER, src_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst_fbo.handle);
glBlitFramebuffer(0, 0, pattern_size, pattern_size,
0, 0, pattern_size, pattern_size,
buffer_to_test, GL_NEAREST);
/* Blit from dst_fbo to the right half of the window system
* framebuffer, with no scrambling.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, dst_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlitFramebuffer(0, 0, pattern_size, pattern_size,
pattern_size, 0, pattern_size*2, pattern_size,
buffer_to_test, GL_NEAREST);
/* If we were testing depth or stencil, manifest the image so
* that we can see it.
*/
glViewport(0, 0, piglit_width, piglit_height);
if (manifest_program)
manifest_program->run();
/* Check that the left and right halves of the screen match. */
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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