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.h"
  40
  41 int piglit_width = 2, piglit_height = 2;
  42 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  43
  44 static GLboolean
  45 probe(int x, int y, uint32_t expected, uint32_t observed)
  46 {
  47         if ((expected & 0xffffff) != (observed & 0xffffff)) {
  48                 printf("Probe at (%i,%i)\n", x, y);
  49                 printf("  Expected: 0x%08x\n", expected);
  50                 printf("  Observed: 0x%08x\n", observed);
  51
  52                 return GL_FALSE;
  53         } else {
  54                 return GL_TRUE;
  55         }
  56 }
  57
  58 enum piglit_result
  59 piglit_display(void)
  60 {
  61         GLboolean pass = GL_TRUE;
  62         uint32_t *addr;
  63         GLuint pbo;
  64
  65         glClearColor(0.0, 0.0, 0.0, 0.0);
  66         glClear(GL_COLOR_BUFFER_BIT);
  67
  68         glGenBuffersARB(1, &pbo);
  69         glBindBufferARB(GL_PIXEL_PACK_BUFFER, pbo);
  70         glBufferDataARB(GL_PIXEL_PACK_BUFFER, 4 * 4, NULL, GL_STREAM_DRAW_ARB);
  71         glPixelStorei(GL_PACK_ALIGNMENT, 1);
  72
  73         glViewport(0, 0, 2, 2);
  74         piglit_ortho_projection(2, 2, GL_FALSE);
  75
  76         /* bottom: green.  top: blue. */
  77         glColor4f(0.0, 1.0, 0.0, 0.0);
  78         piglit_draw_rect(0, 0, 2, 1);
  79         glColor4f(0.0, 0.0, 1.0, 0.0);
  80         piglit_draw_rect(0, 1, 2, 1);
  81
  82         /* Read the whole buffer. */
  83         glReadPixels(0, 0, 2, 2,
  84                      GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)0);
  85         addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
  86         pass &= probe(0, 0, 0x0000ff00, addr[0]);
  87         pass &= probe(1, 0, 0x0000ff00, addr[1]);
  88         pass &= probe(0, 1, 0x000000ff, addr[2]);
  89         pass &= probe(1, 1, 0x000000ff, addr[3]);
  90         glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
  91
  92         /* Read with an offset. */
  93         glReadPixels(1, 0, 1, 1,
  94                      GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)4);
  95         addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
  96         pass &= probe(1, 0, 0x0000ff00, addr[1]);
  97         glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
  98
  99         /* Read with an offset. */
 100         glReadPixels(1, 1, 1, 1,
 101                      GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)4);
 102         addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
 103         pass &= probe(1, 1, 0x000000ff, addr[1]);
 104         glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
 105
 106         glutSwapBuffers();
 107
 108         glDeleteBuffersARB(1, &pbo);
 109
 110         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 111 }
 112
 113
 114 static void reshape(int width, int height)
 115 {
 116         piglit_width = width;
 117         piglit_height = height;
 118
 119         piglit_ortho_projection(width, height, GL_FALSE);
 120 }
 121
 122 void
 123 piglit_init(int argc, char **argv)
 124 {
 125         reshape(piglit_width, piglit_height);
 126         piglit_require_extension("GL_ARB_pixel_buffer_object");
 127 }