tests/spec/gl-1.0/read-cache-stress-test.c

   1 /*
   2  * Copyright © 2008 Nicolai Hähnle
   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
  24 /**
  25  * @file read-cache-stress-test.c
  26  *
  27  * Test case for an odd problem in Radeon R300 on-chip readcache.
  28  *
  29  * Basically, on some particular access patterns, the read cache misses the
  30  * fact that the framebuffer has changed, and a glReadPixels returns stale
  31  * data.
  32  *
  33  * The test works by repeatedly rendering a square in different colors,
  34  * and testing after each run that a number of pixel locations return the
  35  * right color.
  36  *
  37  * @note By the nature of the test, it makes no sense to have a demo mode,
  38  * so this test is always automatic.
  39  */
  40
  41 #include "piglit-util-gl.h"
  42
  43 PIGLIT_GL_TEST_CONFIG_BEGIN
  44
  45         config.supports_gl_compat_version = 11;
  46
  47         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  48         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  49
  50 PIGLIT_GL_TEST_CONFIG_END
  51
  52 static GLfloat colors[8][3] = {
  53         { 1.0, 1.0, 1.0 },
  54         { 1.0, 0.0, 0.0 },
  55         { 0.0, 1.0, 0.0 },
  56         { 0.0, 0.0, 1.0 },
  57         { 0.5, 0.0, 0.0 },
  58         { 0.0, 0.5, 0.0 },
  59         { 0.0, 0.0, 0.5 },
  60         { 0.0, 0.0, 0.0 }
  61 };
  62
  63 enum piglit_result piglit_display(void)
  64 {
  65         int x, y, color, i, comp;
  66         /* x and y range chosen to cover a wide range of memory;
  67          * Actually, only the x coordinate should matter, but who knows... */
  68         for(y = 0; y < 8; ++y) {
  69                 for(x = 0; x < 32; ++x) {
  70                         for(color = 0; color < 8; ++color) {
  71                                 glColor3fv(colors[color]);
  72                                 glBegin(GL_QUADS);
  73                                 glVertex2f(-1, -1);
  74                                 glVertex2f( 1, -1);
  75                                 glVertex2f( 1,  1);
  76                                 glVertex2f(-1,  1);
  77                                 glEnd();
  78
  79                                 for(i = 0; i < 2; ++i) {
  80                                         GLfloat result[3];
  81                                         glReadPixels(x + (i ^ ((color/2)&1))*10, y,
  82                                                 1, 1, GL_RGB, GL_FLOAT, result);
  83
  84                                         for(comp = 0; comp < 3; ++comp) {
  85                                                 if (fabs(colors[color][comp] - result[comp]) > 0.01) {
  86                                                         printf("(x,y) = (%i,%i), color=%i, expected: %f %f %f got %f %f %f\n",
  87                                                                 x, y, color,
  88                                                                 colors[color][0], colors[color][1], colors[color][2],
  89                                                                 result[0], result[1], result[2]);
  90                                                         return PIGLIT_FAIL;
  91                                                 }
  92                                         }
  93                                 }
  94                         }
  95                 }
  96         }
  97
  98         return PIGLIT_PASS;
  99 }
 100
 101 void piglit_init(int argc, char **argv)
 102 {
 103         (void) argc;
 104         (void) argv;
 105
 106         piglit_automatic = GL_TRUE;
 107
 108         glViewport(0, 0, piglit_width, piglit_height);
 109 }