When rendering to multiple draw buffers, the alpha value used by GL_SAMPLE_ALPHA_TO_COVERAGE should come from draw buffer zero, but it should have an effect on all the draw buffers.
Signed-off-by: Anuj Phogat <[email protected]> --- tests/all.tests | 6 + .../ext_framebuffer_multisample/CMakeLists.gl.txt | 2 + .../draw-buffers-alpha-to-coverage.cpp | 133 ++++++++++++++++++++ 3 files changed, 141 insertions(+), 0 deletions(-) create mode 100644 tests/spec/ext_framebuffer_multisample/draw-buffers-alpha-to-coverage.cpp diff --git a/tests/all.tests b/tests/all.tests index e93ea5f..b45181d 100644 --- a/tests/all.tests +++ b/tests/all.tests @@ -1437,6 +1437,12 @@ for num_samples in MSAA_SAMPLE_COUNTS: ext_framebuffer_multisample[test_name] = PlainExecTest(executable) for num_samples in MSAA_SAMPLE_COUNTS: + test_name = ' '.join(['draw-buffers-alpha-to-coverage', str(num_samples)]) + executable = 'ext_framebuffer_multisample-{0} -auto'.format( + test_name) + ext_framebuffer_multisample[test_name] = PlainExecTest(executable) + +for num_samples in MSAA_SAMPLE_COUNTS: test_name = ' '.join(['bitmap', str(num_samples)]) executable = 'ext_framebuffer_multisample-{0} -auto'.format( test_name) diff --git a/tests/spec/ext_framebuffer_multisample/CMakeLists.gl.txt b/tests/spec/ext_framebuffer_multisample/CMakeLists.gl.txt index 716e4f3..257c095 100644 --- a/tests/spec/ext_framebuffer_multisample/CMakeLists.gl.txt +++ b/tests/spec/ext_framebuffer_multisample/CMakeLists.gl.txt @@ -18,6 +18,8 @@ piglit_add_executable (ext_framebuffer_multisample-clear common.cpp clear.cpp) piglit_add_executable (ext_framebuffer_multisample-clip-and-scissor-blit common.cpp clip-and-scissor-blit.cpp) piglit_add_executable (ext_framebuffer_multisample-draw-buffers-alpha-to-one common.cpp draw-buffers-common.cpp draw-buffers-alpha-to-one.cpp) +piglit_add_executable (ext_framebuffer_multisample-draw-buffers-alpha-to-coverage common.cpp + draw-buffers-common.cpp draw-buffers-alpha-to-coverage.cpp) piglit_add_executable (ext_framebuffer_multisample-dlist dlist.c) piglit_add_executable (ext_framebuffer_multisample-enable-flag enable-flag.cpp common.cpp) piglit_add_executable (ext_framebuffer_multisample-formats common.cpp formats.cpp) diff --git a/tests/spec/ext_framebuffer_multisample/draw-buffers-alpha-to-coverage.cpp b/tests/spec/ext_framebuffer_multisample/draw-buffers-alpha-to-coverage.cpp new file mode 100644 index 0000000..7c10c36 --- /dev/null +++ b/tests/spec/ext_framebuffer_multisample/draw-buffers-alpha-to-coverage.cpp @@ -0,0 +1,133 @@ +/* + * 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 draw-buffers-alpha-to-coverage.cpp + * + * Verify sample alpha to coverage with multiple draw buffers + * + * When rendering to multiple draw buffers, the alpha value used by + * GL_SAMPLE_TO_COVERAGE should come from draw buffer zero, but it should + * have an effect on all the draw buffers. + * + * This test operates by drawing a pattern in multisample FBO to generate + * reference and test images for all the draw buffers. Reference images are drawn + * to right half of window system draw buffer and test images to left half. + * + * Compute the expected color values for all the draw buffers. + * + * Probe all the draw buffers blitted to downsampled FBO (resolve_fbo) and + * compare against expected color values. + * + * Author: Anuj Phogat <[email protected]> + */ + +PIGLIT_GL_TEST_MAIN(512 /*window_width*/, + 768 /*window_height*/, + GLUT_DOUBLE | GLUT_RGBA | GLUT_ALPHA) + +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_gl_version(30); + + 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, + GL_RGBA); + shader_compile(); +} + +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(); + + 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 draw_buffers 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. + */ + pass = probe_framebuffer_color() && pass; + + /* Free the memory allocated for data arrays */ + free_data_arrays(); + + if (!piglit_automatic) + piglit_present_results(); + + return pass ? PIGLIT_PASS : PIGLIT_FAIL; +} -- 1.7.7.6 _______________________________________________ Piglit mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/piglit
