tests/spec/ext_packed_depth_stencil/readdrawpixels.c

   1 /*
   2  * Copyright © 2014 VMware, Inc.
   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  * Test GL_EXT_packed_depth_stencil with glRead/DrawPixels
  26  * Based on an original Glean test written by Brian Paul.
  27  */
  28
  29 #include "piglit-util-gl.h"
  30
  31 PIGLIT_GL_TEST_CONFIG_BEGIN
  32         config.supports_gl_compat_version = 12;
  33         config.window_visual = (PIGLIT_GL_VISUAL_RGBA |
  34                                 PIGLIT_GL_VISUAL_DEPTH |
  35                                 PIGLIT_GL_VISUAL_STENCIL);
  36         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  37 PIGLIT_GL_TEST_CONFIG_END
  38
  39
  40 static bool
  41 test_readdrawpixels(void)
  42 {
  43         /*reference image data */
  44         static const GLuint image[4] = {
  45                 0x00000000,
  46                 0x000000ff,
  47                 0xffffff00,
  48                 0xffffffff
  49         };
  50         GLuint readback[4];
  51         GLuint stencilMap[2] = { 2, 2 };  /* map all stencil values to 2 */
  52         int i;
  53
  54         glWindowPos2i(0, 0);
  55         glDrawPixels(2, 2, GL_DEPTH_STENCIL_EXT,
  56                      GL_UNSIGNED_INT_24_8_EXT, image);
  57         if (!piglit_check_gl_error(GL_NO_ERROR))
  58                 return false;
  59
  60         glReadPixels(0, 0, 2, 2, GL_DEPTH_STENCIL_EXT,
  61                      GL_UNSIGNED_INT_24_8_EXT, readback);
  62         if (!piglit_check_gl_error(GL_NO_ERROR))
  63                 return false;
  64
  65         for (i = 0; i < 4; i++) {
  66                 if (image[i] != readback[i]) {
  67                         printf("Image returned by glReadPixels didn't match"
  68                                " the expected result (0x%x != 0x%x)\n",
  69                                readback[i], image[i]);
  70                         return false;
  71                 }
  72         }
  73
  74         /* test depth scale/bias and stencil mapping (in a trivial way) */
  75         glPixelTransferf(GL_DEPTH_SCALE, 0.0);  /* map all depths to 1.0 */
  76         glPixelTransferf(GL_DEPTH_BIAS, 1.0);
  77         glPixelMapuiv(GL_PIXEL_MAP_S_TO_S, 2, stencilMap);
  78         glPixelTransferi(GL_MAP_STENCIL, 1);
  79         glReadPixels(0, 0, 2, 2, GL_DEPTH_STENCIL_EXT,
  80                      GL_UNSIGNED_INT_24_8_EXT, readback);
  81         if (!piglit_check_gl_error(GL_NO_ERROR))
  82                 return false;
  83
  84         for (i = 0; i < 4; i++) {
  85                 if (readback[i] != 0xffffff02) {
  86                         printf("Image returned by glReadPixels didn't match"
  87                                " the expected result (0x%x != 0xffffff02)\n",
  88                                readback[i]);
  89                         return false;
  90                 }
  91         }
  92         glPixelTransferf(GL_DEPTH_SCALE, 1.0);
  93         glPixelTransferf(GL_DEPTH_BIAS, 0.0);
  94         glPixelTransferi(GL_MAP_STENCIL, 0);
  95
  96         return true;
  97 }
  98
  99
 100 void
 101 piglit_init(int argc, char **argv)
 102 {
 103         bool pass = true;
 104
 105         piglit_require_extension("GL_EXT_packed_depth_stencil");
 106
 107         pass = test_readdrawpixels() && pass;
 108
 109         piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
 110 }
 111
 112
 113 enum piglit_result
 114 piglit_display(void)
 115 {
 116         /* unused */
 117         return PIGLIT_FAIL;
 118 }