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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.
*/
/** \file blit-flipped.cpp
*
* From the GL 4.3 spec, section 18.3.1 "Blitting Pixel Rectangles":
*
* If SAMPLE_BUFFERS for either the read framebuffer or draw
* framebuffer is greater than zero, no copy is performed and an
* INVALID_OPERATION error is generated if the dimensions of the
* source and destination rectangles provided to BlitFramebuffer
* are not identical, or if the formats of the read and draw
* framebuffers are not identical.
*
* It is not clear from the spec whether "dimensions" should mean both
* sign and magnitude, or just magnitude. However, Y flips are likely
* to be commonplace in OpenGL applications that have been ported from
* DirectX applications, as a result of the fact that DirectX and
* OpenGL differ in their orientation of the Y axis. Furthermore, at
* least one commercial driver (nVidia) permits Y flips, and L4D2
* relies on them being permitted. So it seems prudent to assume that
* "dimensions" means just magnitude, not sign.
*
* This test verifies that a blit from a multisampled buffer to a
* single-sampled buffer is permitted to flip either in the X or Y
* direction, and that the resulting image is the same as what would
* be obtained by doing a non-flipped blit to a single-sampled buffer,
* and then a second blit that performs a flip.
*/
#include "common.h"
const int pattern_width = 256; const int pattern_height = 256;
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = pattern_width*2;
config.window_height = pattern_height;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_ALPHA;
PIGLIT_GL_TEST_CONFIG_END
static Fbo multisampled_fbo, singlesampled_fbo;
static TestPattern *test_pattern;
static GLint srcX0, srcY0, srcX1, srcY1;
static void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <num_samples> <flip_direction>\n"
" where <flip_direction> is either x or y\n",
prog_name);
piglit_report_result(PIGLIT_FAIL);
}
void
piglit_init(int argc, char **argv)
{
if (argc != 3)
print_usage_and_exit(argv[0]);
/* 1st arg: num_samples */
char *endptr = NULL;
int num_samples = strtol(argv[1], &endptr, 0);
if (endptr != argv[1] + strlen(argv[1]))
print_usage_and_exit(argv[0]);
/* 2nd arg: flip_direction */
if (strcmp(argv[2], "x") == 0) {
srcX0 = pattern_width;
srcX1 = 0;
srcY0 = 0;
srcY1 = pattern_height;
} else if (strcmp(argv[2], "y") == 0) {
srcX0 = 0;
srcX1 = pattern_width;
srcY0 = pattern_height;
srcY1 = 0;
} else {
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");
/* 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);
singlesampled_fbo.setup(FboConfig(0,
pattern_width,
pattern_height));
multisampled_fbo.setup(FboConfig(num_samples,
pattern_width,
pattern_height));
test_pattern = new Triangles();
test_pattern->compile();
if (!piglit_check_gl_error(GL_NO_ERROR)) {
piglit_report_result(PIGLIT_FAIL);
}
}
enum piglit_result
piglit_display()
{
bool pass = true;
/* Draw the test pattern into the multisampled buffer. */
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
multisampled_fbo.set_viewport();
test_pattern->draw(TestPattern::no_projection);
/* Blit it to a single-sampled buffer, flipping the
* appropriate coordinate. This will only work if the
* implementation allows multisampled blits to be flipped.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle);
glBlitFramebuffer(srcX0, srcY0, srcX1, srcY1,
0, 0, pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
/* Blit the resulting image to the screen, performing no
* additional flip. This is the test image.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glBlitFramebuffer(0, 0, pattern_width, pattern_height,
0, 0, pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Blit the test pattern into the single-sampled buffer with
* no flip. This should always work.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle);
glBlitFramebuffer(0, 0, pattern_width, pattern_height,
0, 0, pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Blit the resulting image to the screen, flipping the
* appropriate coordinate, to produce the reference image.
* This should always work (since it is blitting from
* single-sampled to single-sampled).
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glBlitFramebuffer(srcX0, srcY0, srcX1, srcY1,
pattern_width, 0, 2*pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
/* Compare the test and reference images. */
glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
pass = piglit_probe_rect_halves_equal_rgba(0, 0, 2*pattern_width,
pattern_height) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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