tests/fbo/fbo-flushing.c

   1 /*
   2  * Copyright © 2009 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  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 /** @file fbo-flushing.c
  29  *
  30  * Tests that rendering to a texture then texturing from it gets correct
  31  * results.
  32  *
  33  * This caught a bug where the texture cache wasn't flushed appropriately
  34  * on the Intel drivers once additional batchbuffer flushing had been
  35  * removed.
  36  */
  37
  38 #include "piglit-util.h"
  39 #include "piglit-framework.h"
  40
  41 #define TEX_WIDTH 128
  42 #define TEX_HEIGHT 128
  43
  44 int piglit_width = 300;
  45 int piglit_height = 300;
  46 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  47
  48 enum piglit_result
  49 piglit_display(void)
  50 {
  51         GLboolean pass = GL_TRUE;
  52         int y, probe_x, probe_y, size;
  53         GLuint tex, fb;
  54         const float red[] =   {1, 0, 0, 0};
  55         const float green[] = {0, 1, 0, 0};
  56
  57         glClearColor(0.5, 0.5, 0.5, 0.5);
  58         glClear(GL_COLOR_BUFFER_BIT);
  59
  60         glGenTextures(1, &tex);
  61         glBindTexture(GL_TEXTURE_2D, tex);
  62         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
  63                      TEX_WIDTH, TEX_HEIGHT, 0,
  64                      GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  65
  66         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  67         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  68
  69         glGenFramebuffersEXT(1, &fb);
  70         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  71         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  72                                   GL_COLOR_ATTACHMENT0_EXT,
  73                                   GL_TEXTURE_2D,
  74                                   tex,
  75                                   0);
  76         assert(glGetError() == 0);
  77
  78         assert(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) ==
  79                GL_FRAMEBUFFER_COMPLETE_EXT);
  80
  81         /* For each power of two size we test, draw red to it, draw it to
  82          * the framebuffer, then draw green to it and draw it to the
  83          * framebuffer.
  84          *
  85          * Hopefully between these we'll catch any flushing fail.
  86          */
  87         y = 0;
  88         for (size = TEX_WIDTH; size > 0; size /= 2) {
  89                 glDisable(GL_TEXTURE_2D);
  90                 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  91                 glColor4fv(red);
  92                 piglit_ortho_projection(TEX_WIDTH, TEX_HEIGHT, GL_FALSE);
  93                 piglit_draw_rect(0, y, size, size);
  94
  95                 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
  96                 glEnable(GL_TEXTURE_2D);
  97                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
  98                 piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  99                 piglit_draw_rect_tex(0, y, size, size, 0, 0, 1, 1);
 100
 101                 glDisable(GL_TEXTURE_2D);
 102                 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
 103                 glColor4fv(green);
 104                 piglit_ortho_projection(TEX_WIDTH, TEX_HEIGHT, GL_FALSE);
 105                 piglit_draw_rect(0, y, size, size);
 106
 107                 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
 108                 glEnable(GL_TEXTURE_2D);
 109                 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 110                 piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 111                 piglit_draw_rect_tex(0, y, size, size, 0, 0, 1, 1);
 112                 y += size + 5;
 113         }
 114
 115         glDeleteFramebuffersEXT(1, &fb);
 116         glDeleteTextures(1, &tex);
 117
 118         y = 0;
 119         for (size = TEX_WIDTH; size > 0; size /= 2) {
 120                 for (probe_y = 0; probe_y < size; probe_y++) {
 121                         for (probe_x = 0; probe_x < size; probe_x++) {
 122                                 pass = pass && piglit_probe_pixel_rgb(probe_x,
 123                                                                       probe_y,
 124                                                                       green);
 125                         }
 126                 }
 127                 y += size + 5;
 128         }
 129
 130         glutSwapBuffers();
 131
 132         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 133 }
 134
 135 void
 136 piglit_init(int argc, char **argv)
 137 {
 138         piglit_require_extension("GL_EXT_framebuffer_object");
 139 }