/* * 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. * * Authors: * Chris Forbes * */ /* * fbo-mrt-alphatest asserts correct behavior for alpha-testing of fragments * when multiple color buffers are being rendered to. In particular, the alpha * component of the first color output is used for the alpha test. * * This is important for deferred renderers which use alpha-test, and is a * significant edge case for the i965 driver. */ #include "piglit-util-gl.h" PIGLIT_GL_TEST_CONFIG_BEGIN config.supports_gl_compat_version = 21; config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE; config.khr_no_error_support = PIGLIT_NO_ERRORS; PIGLIT_GL_TEST_CONFIG_END GLenum buffers[] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1 }; GLuint fbo; GLint prog; GLuint color0, color1; void piglit_init(int argc, char **argv) { piglit_require_GLSL_version(130); glGenFramebuffers(1, &fbo); glBindFramebuffer(GL_FRAMEBUFFER, fbo); glGenTextures(1, &color0); glBindTexture(GL_TEXTURE_2D, color0); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, color0, 0); glGenTextures(1, &color1); glBindTexture(GL_TEXTURE_2D, color1); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, color1, 0); glDrawBuffers(2, buffers); prog = piglit_build_simple_program( "#version 130\n" "in vec4 pos;\n" "void main() {\n" " gl_Position = pos;\n" "}\n", "#version 130\n" "void main() {\n" " float alpha = float(int(gl_FragCoord.x / 16 + gl_FragCoord.y / 16) % 2);\n" " gl_FragData[0] = vec4(1.0, 0.0, 0.0, alpha);\n" " gl_FragData[1] = vec4(0.0, 1.0, 0.0, 1.0);\n" "}\n" ); if (!piglit_check_gl_error(GL_NO_ERROR)) { printf("Setup for test failed.\n"); piglit_report_result(PIGLIT_SKIP); } if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) { printf("Framebuffer not complete.\n"); piglit_report_result(PIGLIT_SKIP); } } enum piglit_result piglit_display(void) { glBindFramebuffer(GL_FRAMEBUFFER, fbo); glClearColor(0,0,1,0); glClear(GL_COLOR_BUFFER_BIT); glAlphaFunc(GL_GEQUAL, 0.5f); glEnable(GL_ALPHA_TEST); glUseProgram(prog); glViewport(0, 0, 64, 64); piglit_draw_rect(-1, -1, 2, 2); glDisable(GL_ALPHA_TEST); /* visualize it */ glUseProgram(0); glBindFramebuffer(GL_FRAMEBUFFER, piglit_winsys_fbo); glViewport(0, 0, 128, 64); glClearColor(0,0,0.5,0); glClear(GL_COLOR_BUFFER_BIT); glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, color0); piglit_draw_rect_tex(-1, -1, 1, 2, 0, 0, 1, 1); glBindTexture(GL_TEXTURE_2D, color1); piglit_draw_rect_tex(0, -1, 1, 2, 0, 0, 1, 1); glDisable(GL_TEXTURE_2D); { bool pass = true; float red[] = {1,0,0}; float green[] = {0,1,0}; float blue[] = {0,0,1}; pass = piglit_probe_pixel_rgb(4, 4, blue) && pass; pass = piglit_probe_pixel_rgb(12, 4, red) && pass; pass = piglit_probe_pixel_rgb(64 + 4, 4, blue) && pass; pass = piglit_probe_pixel_rgb(64 + 12, 4, green) && pass; piglit_present_results(); return pass ? PIGLIT_PASS : PIGLIT_FAIL; } }