This test varifies that alpha value is not changed with GL_SAMPLE_ALPHA_TO_ONE enabled if GL_MULTISAMPLE is disabled or buffer is not a multisample buffer.
Signed-off-by: Anuj Phogat <[email protected]> --- tests/all.tests | 6 + .../ext_framebuffer_multisample/CMakeLists.gl.txt | 1 + .../negative-sample-alpha-to-one.cpp | 296 ++++++++++++++++++++ 3 files changed, 303 insertions(+), 0 deletions(-) create mode 100644 tests/spec/ext_framebuffer_multisample/negative-sample-alpha-to-one.cpp diff --git a/tests/all.tests b/tests/all.tests index 215ac9c..f6a9a9e 100644 --- a/tests/all.tests +++ b/tests/all.tests @@ -1423,6 +1423,12 @@ for num_samples in MSAA_SAMPLE_COUNTS: ext_framebuffer_multisample[test_name] = PlainExecTest(executable) for num_samples in MSAA_SAMPLE_COUNTS: + test_name = ' '.join(['negative-sample-alpha-to-one', 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 338a5e8..74db2a5 100644 --- a/tests/spec/ext_framebuffer_multisample/CMakeLists.gl.txt +++ b/tests/spec/ext_framebuffer_multisample/CMakeLists.gl.txt @@ -26,6 +26,7 @@ piglit_add_executable (ext_framebuffer_multisample-negative-copyteximage negativ piglit_add_executable (ext_framebuffer_multisample-negative-max-samples negative-max-samples.c) piglit_add_executable (ext_framebuffer_multisample-negative-mismatched-samples negative-mismatched-samples.c) piglit_add_executable (ext_framebuffer_multisample-negative-readpixels negative-readpixels.c) +piglit_add_executable (ext_framebuffer_multisample-negative-sample-alpha-to-one common.cpp negative-sample-alpha-to-one.cpp) piglit_add_executable (ext_framebuffer_multisample-point-smooth common.cpp point-smooth.cpp) piglit_add_executable (ext_framebuffer_multisample-polygon-smooth common.cpp polygon-smooth.cpp) piglit_add_executable (ext_framebuffer_multisample-polygon-stipple common.cpp polygon-stipple.cpp) diff --git a/tests/spec/ext_framebuffer_multisample/negative-sample-alpha-to-one.cpp b/tests/spec/ext_framebuffer_multisample/negative-sample-alpha-to-one.cpp new file mode 100644 index 0000000..7429223 --- /dev/null +++ b/tests/spec/ext_framebuffer_multisample/negative-sample-alpha-to-one.cpp @@ -0,0 +1,296 @@ +/* + * 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 negative-sample-alpha-to-one.cpp + * + * Verify that alpha values are not modified if GL_SAMPLE_ALPHA_TO_ONE is + * enabled and GL_MULTISAMPLE is disabled in a multisample buffer. + * + * Also, verify that alpha values are not modified if GL_SAMPLE_ALPHA_TO_ONE + * is enabled and the buffer is single-sampled. + * + * Author: Anuj Phogat <[email protected]> + */ + +PIGLIT_GL_TEST_MAIN(512 /*window_width*/, + 256 /*window_height*/, + GLUT_DOUBLE | GLUT_RGBA | GLUT_ALPHA) + +const int pattern_width = 256; const int pattern_height = 256; +static Fbo ms_fbo, resolve_fbo; +static GLbitfield buffer_to_test; + +static GLfloat *color = NULL; +static GLint num_samples; +static GLint num_rects; +static GLint prog; +static GLint color_loc; +static GLint depth_loc; + +static const float bg_color[4] = + {0.4, 0.2, 0.6, 0.8}; + + +static const char *vert = + "#version 130\n" + "in vec2 pos;\n" + "uniform float depth;\n" + "void main()\n" + "{\n" + " vec4 eye_pos = gl_ModelViewProjectionMatrix * vec4(pos, 0.0, 1.0);\n" + " gl_Position = vec4(eye_pos.xy, depth, 1.0);\n" + "}\n"; + +static const char *frag = + "#version 130\n" + "uniform vec4 color;\n" + "void main()\n" + "{\n" + " gl_FragColor = color;\n" + "}\n"; + +void +shader_compile() +{ + /* Compile program */ + GLint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert); + GLint fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag); + prog = piglit_link_simple_program(vs, fs); + + if (!piglit_link_check_status(prog)) { + piglit_report_result(PIGLIT_FAIL); + } + + glBindAttribLocation(prog, 0, "pos"); + glEnableVertexAttribArray(0); + + /* Set up uniforms */ + glUseProgram(prog); + color_loc = glGetUniformLocation(prog, "color"); + depth_loc = glGetUniformLocation(prog, "depth"); +} + +void +draw_pattern(bool sample_alpha_to_one) +{ + glUseProgram(prog); + glClearColor(bg_color[0], bg_color[1], + bg_color[2], bg_color[3]); + + glClear(buffer_to_test); + if (sample_alpha_to_one) + glEnable (GL_SAMPLE_ALPHA_TO_ONE); + + unsigned int indices[6] = {0, 1, 2, 0, 2, 3}; + + for (int i = 0; i < num_rects; i++) { + + float vertex_data[4][2] = { + { 0.0f + i * (pattern_width / num_rects), 0.0f }, + { 0.0f + i * (pattern_width / num_rects), pattern_height }, + { (i + 1.0f) * (pattern_width / num_rects), pattern_height }, + { (i + 1.0f) * (pattern_width / num_rects), 0.0f } }; + + glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, + sizeof(vertex_data[0]), + (void *) vertex_data); + + glUniform4fv(color_loc, 1, (color + i * 4)); + glUniform1f(depth_loc, 0.0f); + glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, + (void *) indices); + } + if(sample_alpha_to_one) + glDisable (GL_SAMPLE_ALPHA_TO_ONE); +} + +void +print_usage_and_exit(char *prog_name) +{ + printf("Usage: %s <num_samples>\n", prog_name); + piglit_report_result(PIGLIT_FAIL); +} + + +bool +test_sample_alpha_to_one(Fbo *test_fbo) +{ + bool result = true; + /* Draw test pattern in multisample ms_fbo with GL_SAMPLE_COVERAGE + * enabled + */ + glBindFramebuffer(GL_DRAW_FRAMEBUFFER, test_fbo->handle); + draw_pattern(true); + + if (test_fbo->handle == ms_fbo.handle) { + /* Blit test_fbo to resolve_fbo */ + glBindFramebuffer(GL_READ_FRAMEBUFFER, test_fbo->handle); + glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolve_fbo.handle); + glBlitFramebuffer(0, 0, pattern_width, pattern_height, + 0, 0, pattern_width, pattern_height, + buffer_to_test, GL_NEAREST); + } + + /* Blit resolve_fbo to the left half of window system framebuffer. + * This is the test image. + */ + glBindFramebuffer(GL_READ_FRAMEBUFFER, resolve_fbo.handle); + glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0); + glBlitFramebuffer(0, 0, pattern_width, pattern_height, + 0, 0, pattern_width, pattern_height, + buffer_to_test, GL_NEAREST); + + glBindFramebuffer(GL_READ_FRAMEBUFFER, 0); + result = piglit_probe_rect_halves_equal_rgba(0, 0, piglit_width, + piglit_height) && result; + + result = piglit_check_gl_error(GL_NO_ERROR) && result; + return result; +} + +void +draw_reference_image(void) +{ + /* Draw test pattern in multisample ms_fbo with GL_SAMPLE_ALPHA_TO_ONE + * disabled. + */ + glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle); + ms_fbo.set_viewport(); + draw_pattern(false); + + /* Blit ms_fbo to resolve_fbo */ + glBindFramebuffer(GL_READ_FRAMEBUFFER, ms_fbo.handle); + glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolve_fbo.handle); + glBlitFramebuffer(0, 0, pattern_width, pattern_height, + 0, 0, pattern_width, pattern_height, + buffer_to_test, GL_NEAREST); + + /* Blit ms_fbo to the right half of window system framebuffer. This + * is a reference image to see the visual difference when compared + * to the test image. + */ + glBindFramebuffer(GL_READ_FRAMEBUFFER, resolve_fbo.handle); + glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0); + glBlitFramebuffer(0, 0, pattern_width, pattern_height, + pattern_width, 0, 2 * pattern_width, pattern_height, + buffer_to_test, GL_NEAREST); +} + +void +allocate_data_arrays(void) +{ + /* Draw 2N + 1 rectangles for N samples, each with a unique color */ + num_rects = 2 * num_samples + 1; + + /* Allocate data arrays based on number of samples used */ + color = (float *) malloc(num_rects * 4 * sizeof(float)); + + for(int i = 0; i < num_rects; i++) { + color[i * 4 + 0] = (sin(i * 4 + 0) + 1) / 2; + color[i * 4 + 1] = (sin(i * 4 + 1) + 1) / 2; + color[i * 4 + 2] = (sin(i * 4 + 2) + 1) / 2; + color[i * 4 + 3] = (sin(i * 4 + 3) + 1) / 2; + } +} + +void +free_data_arrays(void) +{ + if(color != NULL) { + free(color); + color = NULL; + } +} + +void +piglit_init(int argc, char **argv) +{ + if (argc < 2) + 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_ortho_projection(pattern_width, pattern_height, GL_TRUE); + + /* 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); + + ms_fbo.setup(FboConfig(num_samples, pattern_width, pattern_height)); + resolve_fbo.setup(FboConfig(0, pattern_width, pattern_height)); + + if (!piglit_check_gl_error(GL_NO_ERROR)) { + printf("Error setting up frame buffer objects\n"); + piglit_report_result(PIGLIT_FAIL); + } + + buffer_to_test = GL_COLOR_BUFFER_BIT; + + /* Enable blending to easily detect any change in alpha values + * caused by GL_SAMPLE_ALPHA_TO_ONE + */ + glEnable(GL_BLEND); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + + shader_compile(); +} + +enum piglit_result +piglit_display() +{ + bool pass = true; + glClearColor(0.0, 0.0, 0.0, 1.0); + glClear(GL_COLOR_BUFFER_BIT); + + allocate_data_arrays(); + draw_reference_image(); + + /* Test multisample fbo with GL_SAMPLE_ALPHA_TO_ONE enabled but + * GL_MULTISAMPLE disabled */ + glDisable(GL_MULTISAMPLE); + + pass = test_sample_alpha_to_one(&ms_fbo) && pass; + + glEnable(GL_MULTISAMPLE); + + /* Test singlesample fbo with GL_SAMPLE_ALPHA_TO_ONE enabled */ + pass = test_sample_alpha_to_one(&resolve_fbo) && pass; + + 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
