<div dir="ltr">On 25 October 2013 16:49, Anuj Phogat <<a href="mailto:anuj.phogat@gmail.com" target="_blank">anuj.phogat@gmail.com</a>> wrote: <div class="gmail_extra"><div class="gmail_quote"> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">V2: Get rid of redundant projection matrix. Signed-off-by: Anuj Phogat <<a href="mailto:anuj.phogat@gmail.com" target="_blank">anuj.phogat@gmail.com</a>> --- tests/all.tests | 5 + .../arb_sample_shading/execution/CMakeLists.gl.txt | 1 + .../execution/builtin-gl-sample-id.cpp | 230 +++++++++++++++++++++ 3 files changed, 236 insertions(+) create mode 100644 tests/spec/arb_sample_shading/execution/builtin-gl-sample-id.cpp </blockquote><div> </div><div>I'm not comfortable with this test. It doesn't verify that gl_SampleID is correct for each sample. It just averages together float(gl_SampleID)/float(gl_NumSamples) for all samples and verifies that is equals the expected value (which will always be near 0.5). In particular, if there's a bug causing gl_SampleID to identify the samples in an incorrect order, that won't be caught by this test. </div><div>I'd recommend keeping your vertex and fragment shader, but instead of drawing to a renderbuffer, draw to a multisampled texture (using ARB_texture_multisample). Then you can have a second shader which reads from the multisampled texture and verifies that every sample is correct at every pixel location. </div><div>Also, Chris's suggestion from patch 2 (about reinventing piglit_draw_rect) applies here as well. </div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> diff --git a/tests/all.tests b/tests/all.tests index 1fcd08a..d861a91 100644 --- a/tests/all.tests +++ b/tests/all.tests @@ -1342,6 +1342,11 @@ for num_samples in TEST_SAMPLE_COUNTS: executable = 'arb_sample_shading-{0} -auto'.format(test_name) arb_sample_shading[test_name] = PlainExecTest(executable) +for num_samples in TEST_SAMPLE_COUNTS: + test_name = 'builtin-gl-sample-id {0}'.format(num_samples) + executable = 'arb_sample_shading-{0} -auto'.format(test_name) + arb_sample_shading[test_name] = PlainExecTest(executable) + # Group ARB_debug_output arb_debug_output = Group() spec['ARB_debug_output'] = arb_debug_output diff --git a/tests/spec/arb_sample_shading/execution/CMakeLists.gl.txt b/tests/spec/arb_sample_shading/execution/CMakeLists.gl.txt index 56fa0da..35f2905 100644 --- a/tests/spec/arb_sample_shading/execution/CMakeLists.gl.txt +++ b/tests/spec/arb_sample_shading/execution/CMakeLists.gl.txt @@ -12,4 +12,5 @@ link_libraries ( piglit_add_executable (arb_sample_shading-api api.c) piglit_add_executable (arb_sample_shading-builtin-gl-num-samples builtin-gl-num-samples.cpp) +piglit_add_executable (arb_sample_shading-builtin-gl-sample-id builtin-gl-sample-id.cpp) # vim: ft=cmake: diff --git a/tests/spec/arb_sample_shading/execution/builtin-gl-sample-id.cpp b/tests/spec/arb_sample_shading/execution/builtin-gl-sample-id.cpp new file mode 100644 index 0000000..143dc95 --- /dev/null +++ b/tests/spec/arb_sample_shading/execution/builtin-gl-sample-id.cpp @@ -0,0 +1,230 @@ +/* + * Copyright © 2013 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 builtin-gl-sample-id.cpp + * This test verifies that using gl_SampleID in fragment shader program + * works as per ARB_sample_shading specification. + * + **/ + +#include "piglit-fbo.h" +using namespace piglit_util_fbo; + +const int pattern_width = 128; const int pattern_height = 128; + +PIGLIT_GL_TEST_CONFIG_BEGIN + + config.supports_gl_compat_version = 10; + + config.window_width = pattern_width; + config.window_height = pattern_height; + config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA; + +PIGLIT_GL_TEST_CONFIG_END + +static int num_samples; +static unsigned prog, vao, vertex_buf; +static Fbo multisampled_fbo, singlesampled_fbo; + +static void +print_usage_and_exit(char *prog_name) +{ + printf("Usage: %s <num_samples>\n", prog_name); + piglit_report_result(PIGLIT_FAIL); +} + +void +compile_shader(void) +{ + static const char *vert = + "#version 130\n" + "in vec2 pos;\n" + "void main()\n" + "{\n" + " gl_Position = vec4(pos, 0.0, 1.0);\n" + "}\n"; + static const char *frag = + "#version 130\n" + "#extension GL_ARB_sample_shading : enable\n" + "uniform int samples;\n" + "out vec4 out_color;\n" + "void main()\n" + "{\n" + " if(samples == 0)\n" + " out_color = vec4(0.0, 1.0, 0.0, 1.0);\n" + " else\n" + " out_color = vec4(0.0, float(gl_SampleID) / samples, 0.0, 1.0);\n" + "}\n"; + /* Compile program */ + prog = glCreateProgram(); + GLint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert); + glAttachShader(prog, vs); + piglit_check_gl_error(GL_NO_ERROR); + GLint fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag); + glAttachShader(prog, fs); + glBindAttribLocation(prog, 0, "pos"); + glLinkProgram(prog); + if (!piglit_link_check_status(prog)) { + piglit_report_result(PIGLIT_FAIL); + } + + /* Set up vertex array object */ + glGenVertexArrays(1, &vao); + glBindVertexArray(vao); + + /* Set up vertex input buffer */ + glGenBuffers(1, &vertex_buf); + glBindBuffer(GL_ARRAY_BUFFER, vertex_buf); + glEnableVertexAttribArray(0); + glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), + (void *) 0); + + /* Set up element input buffer to tesselate a quad into + * triangles + */ + unsigned int indices[6] = { 0, 1, 2, 0, 2, 3 }; + GLuint element_buf; + glGenBuffers(1, &element_buf); + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, element_buf); + glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, + GL_STATIC_DRAW); +} + +void +draw_pattern(GLint samples) +{ + float vertex_data[4][4] = { + { -1, -1 }, + { -1, 1 }, + { 1, 1 }, + { 1, -1 }}; + + glUseProgram(prog); + glBindVertexArray(vao); + + /* Set up uniforms */ + glUseProgram(prog); + glUniform1i(glGetUniformLocation(prog, "samples"), samples); + + glBindBuffer(GL_ARRAY_BUFFER, vertex_buf); + glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_data), vertex_data, + GL_STREAM_DRAW); + glDrawElements(GL_TRIANGLES, 6 , GL_UNSIGNED_INT, (void *) 0); +} + +void +piglit_init(int argc, char **argv) +{ + if (argc != 2) + print_usage_and_exit(argv[0]); + + /* 1st arg: num_samples */ + 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(21); + piglit_require_extension("GL_ARB_vertex_array_object"); + piglit_require_extension("GL_ARB_sample_shading"); + + /* 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)); + + FboConfig msConfig(num_samples, pattern_width, pattern_height); + multisampled_fbo.setup(msConfig); + + compile_shader(); + if (!piglit_check_gl_error(GL_NO_ERROR)) { + piglit_report_result(PIGLIT_FAIL); + } +} + +bool test_builtin_sample_id(Fbo ms_fbo) +{ + bool pass = true; + int i, samples; + float expected[4] = {0.0, 0.0, 0.0, 1.0}; + + glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle); + glGetIntegerv(GL_SAMPLES, &samples); + + /* Expected color is computed after taking in to account the + * multisample color resolve: + * ((sample_id0 + sample_id_1 + sample_id_2 + sample_id_3) + * / (samples * samples)) + */ + if (samples == 0) + expected[1] = 1.0; + else { + for (i = 0; i < samples; i++) + expected[1] += (((float) i) / samples); + expected[1] /= samples; + } + + glClear(GL_COLOR_BUFFER_BIT); + draw_pattern(samples); + + glBindFramebuffer(GL_READ_FRAMEBUFFER, ms_fbo.handle); + glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle); + glClear(GL_COLOR_BUFFER_BIT); + glBlitFramebuffer(0, 0, + pattern_width, pattern_height, + 0, 0, + pattern_width, pattern_height, + GL_COLOR_BUFFER_BIT, + GL_NEAREST); + + glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle); + glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo); + + pass = piglit_probe_rect_rgba(0, 0, pattern_width, + pattern_width, expected) + && pass; + glClear(GL_COLOR_BUFFER_BIT); + glBlitFramebuffer(0, 0, + pattern_width, pattern_height, + 0, 0, + pattern_width, pattern_height, + GL_COLOR_BUFFER_BIT, + GL_NEAREST); + + piglit_present_results(); + return pass; +} + +enum piglit_result +piglit_display() +{ + bool pass = true; + pass = test_builtin_sample_id(multisampled_fbo) + && pass; + return pass ? PIGLIT_PASS : PIGLIT_FAIL; +} -- 1.8.1.4 _______________________________________________ Piglit mailing list <a href="mailto:Piglit@lists.freedesktop.org" target="_blank">Piglit@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/piglit" target="_blank">http://lists.freedesktop.org/mailman/listinfo/piglit</a> </blockquote></div> </div></div>