tests/fbo/fbo-mrt-alphatest.c

   1 /*
   2  * Copyright © 2013 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Chris Forbes <chrisf@ijw.co.nz>
  25  *
  26  */
  27
  28 /*
  29  * fbo-mrt-alphatest asserts correct behavior for alpha-testing of fragments
  30  * when multiple color buffers are being rendered to. In particular, the alpha
  31  * component of the first color output is used for the alpha test.
  32  *
  33  * This is important for deferred renderers which use alpha-test, and is a
  34  * significant edge case for the i965 driver.
  35  */
  36
  37 #include "piglit-util-gl.h"
  38
  39 PIGLIT_GL_TEST_CONFIG_BEGIN
  40
  41         config.supports_gl_compat_version = 21;
  42
  43         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  44         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  45
  46 PIGLIT_GL_TEST_CONFIG_END
  47
  48 GLenum buffers[] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1 };
  49 GLuint fbo;
  50 GLint prog;
  51 GLuint color0, color1;
  52
  53 void
  54 piglit_init(int argc, char **argv)
  55 {
  56         piglit_require_GLSL_version(120);
  57         piglit_require_minimum_getinteger(GL_MAX_DRAW_BUFFERS, 2);
  58
  59         glGenFramebuffers(1, &fbo);
  60         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
  61
  62         glGenTextures(1, &color0);
  63         glBindTexture(GL_TEXTURE_2D, color0);
  64         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  65         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  66         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  67         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, color0, 0);
  68
  69         glGenTextures(1, &color1);
  70         glBindTexture(GL_TEXTURE_2D, color1);
  71         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  72         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  73         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  74         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, color1, 0);
  75
  76         glDrawBuffers(2, buffers);
  77
  78         prog = piglit_build_simple_program(
  79                 "#version 120\n"
  80                 "attribute vec4 pos;\n"
  81                 "void main() {\n"
  82                 "       gl_Position = pos;\n"
  83                 "}\n",
  84
  85                 "#version 120\n"
  86                 "void main() {\n"
  87                 "       float alpha = mod(floor(gl_FragCoord.x / 16 + gl_FragCoord.y / 16), 2);\n"
  88                 "       gl_FragData[0] = vec4(1.0, 0.0, 0.0, alpha);\n"
  89                 "       gl_FragData[1] = vec4(0.0, 1.0, 0.0, 1.0);\n"
  90                 "}\n"
  91                 );
  92
  93         if (!piglit_check_gl_error(GL_NO_ERROR)) {
  94                 printf("Setup for test failed.\n");
  95                 piglit_report_result(PIGLIT_SKIP);
  96         }
  97
  98         if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
  99                 printf("Framebuffer not complete.\n");
 100                 piglit_report_result(PIGLIT_SKIP);
 101         }
 102 }
 103
 104
 105 enum piglit_result
 106 piglit_display(void)
 107 {
 108         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 109         glClearColor(0,0,1,0);
 110         glClear(GL_COLOR_BUFFER_BIT);
 111
 112         glAlphaFunc(GL_GEQUAL, 0.5f);
 113         glEnable(GL_ALPHA_TEST);
 114
 115         glUseProgram(prog);
 116         glViewport(0, 0, 64, 64);
 117         piglit_draw_rect(-1, -1, 2, 2);
 118
 119         glDisable(GL_ALPHA_TEST);
 120
 121         /* visualize it */
 122         glUseProgram(0);
 123         glBindFramebuffer(GL_FRAMEBUFFER, piglit_winsys_fbo);
 124         glViewport(0, 0, 128, 64);
 125         glClearColor(0,0,0.5,0);
 126         glClear(GL_COLOR_BUFFER_BIT);
 127
 128         glEnable(GL_TEXTURE_2D);
 129
 130         glBindTexture(GL_TEXTURE_2D, color0);
 131         piglit_draw_rect_tex(-1, -1, 1, 2,
 132                         0, 0, 1, 1);
 133         glBindTexture(GL_TEXTURE_2D, color1);
 134         piglit_draw_rect_tex(0, -1, 1, 2,
 135                         0, 0, 1, 1);
 136
 137         glDisable(GL_TEXTURE_2D);
 138
 139         {
 140                 bool pass = true;
 141                 float red[] = {1,0,0};
 142                 float green[] = {0,1,0};
 143                 float blue[] = {0,0,1};
 144                 pass = piglit_probe_pixel_rgb(4, 4, blue) && pass;
 145                 pass = piglit_probe_pixel_rgb(12, 4, red) && pass;
 146                 pass = piglit_probe_pixel_rgb(64 + 4, 4, blue) && pass;
 147                 pass = piglit_probe_pixel_rgb(64 + 12, 4, green) && pass;
 148
 149                 piglit_present_results();
 150
 151                 return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 152         }
 153 }