tests/general/pbo-drawpixels.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-drawpixels.c
  29  *
  30  * Tests that using a PBO as the unpack buffer for glDrawPixels works correctly.
  31  * Caught a bug with the Intel driver with the metaops drawpixels code.
  32  */
  33
  34 #include "piglit-util.h"
  35
  36 int piglit_width = 100, piglit_height = 100;
  37 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  38
  39 enum piglit_result
  40 piglit_display(void)
  41 {
  42         GLboolean pass = GL_TRUE;
  43         static float red[] = {1.0, 0.0, 0.0, 0.0};
  44         static float green[] = {0.0, 1.0, 0.0, 0.0};
  45         static float blue[]  = {0.0, 0.0, 1.0, 0.0};
  46         float *pixels;
  47         GLuint pbo;
  48
  49         glClearColor(0.5, 0.5, 0.5, 0.0);
  50         glClear(GL_COLOR_BUFFER_BIT);
  51
  52         glGenBuffersARB(1, &pbo);
  53         glBindBufferARB(GL_PIXEL_UNPACK_BUFFER, pbo);
  54         glBufferDataARB(GL_PIXEL_UNPACK_BUFFER, 4 * 4 * sizeof(float),
  55                         NULL, GL_STREAM_DRAW_ARB);
  56         pixels = glMapBufferARB(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY_ARB);
  57
  58         memcpy(pixels + 0,  red, sizeof(red));
  59         memcpy(pixels + 4,  green, sizeof(green));
  60         memcpy(pixels + 8,  blue, sizeof(blue));
  61         memcpy(pixels + 12, red, sizeof(red));
  62
  63         glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER);
  64
  65         glRasterPos2i(10, 10);
  66         glDrawPixels(2, 2, GL_RGBA, GL_FLOAT, 0);
  67
  68         glBindBufferARB(GL_PIXEL_UNPACK_BUFFER, 0);
  69         glDeleteBuffersARB(1, &pbo);
  70
  71         pass &= piglit_probe_pixel_rgb(10, 10, red);
  72         pass &= piglit_probe_pixel_rgb(11, 10, green);
  73         pass &= piglit_probe_pixel_rgb(10, 11, blue);
  74         pass &= piglit_probe_pixel_rgb(11, 11, red);
  75
  76         glutSwapBuffers();
  77
  78         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
  79 }
  80
  81
  82 static void reshape(int width, int height)
  83 {
  84         piglit_width = width;
  85         piglit_height = height;
  86
  87         piglit_ortho_projection(width, height, GL_FALSE);
  88 }
  89
  90 void
  91 piglit_init(int argc, char **argv)
  92 {
  93         reshape(piglit_width, piglit_height);
  94         piglit_require_extension("GL_ARB_pixel_buffer_object");
  95         glewInit();
  96 }