tests/general/read-front.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 read-front.c
  29  *
  30  * Tests that reading the front buffer after a draw to back and swap
  31  * works correctly.
  32  *
  33  * This catches a regression in the Intel driver with DRI2, where the
  34  * read buffer didn't have an actual buffer present if it hadn't been
  35  * used as a draw buffer.
  36  */
  37
  38 #include "piglit-util-gl.h"
  39
  40 PIGLIT_GL_TEST_CONFIG_BEGIN
  41
  42         config.supports_gl_compat_version = 10;
  43
  44         config.requires_displayed_window = true;
  45         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_STENCIL;
  46
  47 PIGLIT_GL_TEST_CONFIG_END
  48
  49 static GLboolean clear_front_first;
  50
  51 enum piglit_result
  52 piglit_display(void)
  53 {
  54         GLboolean pass = GL_TRUE;
  55         static float blue[]   = {0.0, 0.0, 1.0, 0.0};
  56         static float green[] = {0.0, 1.0, 0.0, 0.0};
  57
  58         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  59
  60         if (clear_front_first) {
  61                 /* This should allocate the front buffer in the driver
  62                  * if it hasn't been allocated already.
  63                  */
  64                 glDrawBuffer(GL_FRONT);
  65                 glClear(GL_COLOR_BUFFER_BIT);
  66                 glDrawBuffer(GL_BACK);
  67         }
  68
  69         glClear(GL_COLOR_BUFFER_BIT);
  70         glColor4fv(green);
  71         piglit_draw_rect(0, piglit_height / 2, piglit_width, piglit_height);
  72
  73         glReadBuffer(GL_FRONT);
  74
  75         piglit_swap_buffers();
  76
  77         pass &= piglit_probe_rect_rgb(0, 0,
  78                                       piglit_width, piglit_height / 2, blue);
  79         pass &= piglit_probe_rect_rgb(0, piglit_height / 2,
  80                                       piglit_width, piglit_height / 2, green);
  81
  82         glReadBuffer(GL_BACK);
  83
  84         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  85 }
  86
  87
  88 void
  89 piglit_init(int argc, char **argv)
  90 {
  91         int i;
  92
  93         glClearColor(0.0, 0.0, 1.0, 0.0);
  94
  95         for (i = 1; i < argc; i++) {
  96                 if (strcmp(argv[i], "clear-front-first") == 0) {
  97                         clear_front_first = GL_TRUE;
  98                 }
  99         }
 100 }