tests/general/pbo-readpixels-small.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 pbo-readpixels-small.c
  29  *
  30  * Tests that reading 2x2 BGRA UNSIGNED_BYTE buffers work correctly.
  31  *
  32  * This is the corresponding test to fbo-pbo-readpixels-small test to
  33  * make sure I didn't break any of the coordinate flipping (sure
  34  * enough, I did).
  35  *
  36  * https://bugs.freedesktop.org/show_bug.cgi?id=25921
  37  */
  38
  39 #include "piglit-util-gl.h"
  40
  41 PIGLIT_GL_TEST_CONFIG_BEGIN
  42
  43         config.supports_gl_compat_version = 10;
  44         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  45
  46 PIGLIT_GL_TEST_CONFIG_END
  47
  48 static GLboolean
  49 probe(int x, int y, uint8_t *expected, uint8_t *observed)
  50 {
  51         if (expected[0] != observed[0] ||
  52             expected[1] != observed[1] ||
  53             expected[2] != observed[2]) {
  54                 printf("Probe color at (%i,%i)\n", x, y);
  55                 printf("  Expected: b = 0x%02x  g = 0x%02x  r = 0x%02x  a = 0x%02x\n",
  56                                 expected[0], expected[1], expected[2], expected[3]);
  57                 printf("  Observed: b = 0x%02x  g = 0x%02x  r = 0x%02x  a = 0x%02x\n",
  58                                 observed[0], observed[1], observed[2], observed[3]);
  59
  60                 return GL_FALSE;
  61         } else {
  62                 return GL_TRUE;
  63         }
  64 }
  65
  66 enum piglit_result
  67 piglit_display(void)
  68 {
  69         GLboolean pass = GL_TRUE;
  70         uint8_t *addr;
  71         GLuint pbo;
  72         static uint8_t green[] = {0x00, 0xFF, 0x00, 0x00};
  73         static uint8_t blue[]  = {0xFF, 0x00, 0x00, 0x00};
  74
  75         glClearColor(0.0, 0.0, 0.0, 0.0);
  76         glClear(GL_COLOR_BUFFER_BIT);
  77
  78         glGenBuffersARB(1, &pbo);
  79         glBindBufferARB(GL_PIXEL_PACK_BUFFER, pbo);
  80         glBufferDataARB(GL_PIXEL_PACK_BUFFER, 4 * 4, NULL, GL_STREAM_DRAW_ARB);
  81         glPixelStorei(GL_PACK_ALIGNMENT, 1);
  82
  83         glViewport(0, 0, 2, 2);
  84         piglit_ortho_projection(2, 2, GL_FALSE);
  85
  86         /* bottom: green.  top: blue. */
  87         glColor4f(0.0, 1.0, 0.0, 0.0);
  88         piglit_draw_rect(0, 0, 2, 1);
  89         glColor4f(0.0, 0.0, 1.0, 0.0);
  90         piglit_draw_rect(0, 1, 2, 1);
  91
  92         /* Read the whole buffer. */
  93         glReadPixels(0, 0, 2, 2,
  94                      GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)0);
  95         addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
  96
  97         pass &= probe(0, 0, green, addr);
  98         pass &= probe(1, 0, green, addr + 4);
  99         pass &= probe(0, 1, blue,  addr + 8);
 100         pass &= probe(1, 1, blue,  addr + 12);
 101         glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
 102
 103         /* Read with an offset. */
 104         glReadPixels(1, 0, 1, 1,
 105                      GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)4);
 106         addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
 107         pass &= probe(1, 0, green, addr + 4);
 108         glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
 109
 110         /* Read with an offset. */
 111         glReadPixels(1, 1, 1, 1,
 112                      GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)4);
 113         addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
 114         pass &= probe(1, 1, blue, addr + 4);
 115         glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
 116
 117         piglit_present_results();
 118
 119         glDeleteBuffersARB(1, &pbo);
 120
 121         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 122 }
 123
 124
 125 static void reshape(int width, int height)
 126 {
 127         piglit_width = width;
 128         piglit_height = height;
 129
 130         piglit_ortho_projection(width, height, GL_FALSE);
 131 }
 132
 133 void
 134 piglit_init(int argc, char **argv)
 135 {
 136         reshape(piglit_width, piglit_height);
 137         piglit_require_extension("GL_ARB_pixel_buffer_object");
 138 }