tests/general/pbo-teximage.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-teximage.c
  29  *
  30  * Tests that using a PBO as the unpack buffer for glTexImage works correctly.
  31  */
  32
  33 #include "piglit-util.h"
  34
  35 int piglit_width = 100, piglit_height = 100;
  36 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  37
  38 enum piglit_result
  39 piglit_display(void)
  40 {
  41         GLboolean pass = GL_TRUE;
  42         static float red[] = {1.0, 0.0, 0.0, 0.0};
  43         static float green[] = {0.0, 1.0, 0.0, 0.0};
  44         static float blue[]  = {0.0, 0.0, 1.0, 0.0};
  45         float *pixels;
  46         GLuint pbo, tex;
  47
  48         glClearColor(0.5, 0.5, 0.5, 0.0);
  49         glClear(GL_COLOR_BUFFER_BIT);
  50
  51         glGenBuffersARB(1, &pbo);
  52         glBindBufferARB(GL_PIXEL_UNPACK_BUFFER, pbo);
  53         glBufferDataARB(GL_PIXEL_UNPACK_BUFFER, 4 * 4 * sizeof(float),
  54                         NULL, GL_STREAM_DRAW_ARB);
  55         pixels = glMapBufferARB(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY_ARB);
  56
  57         memcpy(pixels + 0,  red, sizeof(red));
  58         memcpy(pixels + 4,  green, sizeof(green));
  59         memcpy(pixels + 8,  blue, sizeof(blue));
  60         memcpy(pixels + 12, red, sizeof(red));
  61
  62         glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER);
  63         glGenTextures(1, &tex);
  64         glBindTexture(GL_TEXTURE_2D, tex);
  65         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  66         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  67         glTexImage2D(GL_TEXTURE_2D, 0,
  68                      GL_RGBA,
  69                      2, 2, 0,
  70                      GL_RGBA, GL_FLOAT, 0);
  71         glBindBufferARB(GL_PIXEL_UNPACK_BUFFER, 0);
  72         glDeleteBuffersARB(1, &pbo);
  73
  74         glEnable(GL_TEXTURE_2D);
  75         glBegin(GL_TRIANGLE_FAN);
  76         glTexCoord2f(0.0, 0.0); glVertex2f(10, 10);
  77         glTexCoord2f(1.0, 0.0); glVertex2f(20, 10);
  78         glTexCoord2f(1.0, 1.0); glVertex2f(20, 20);
  79         glTexCoord2f(0.0, 1.0); glVertex2f(10, 20);
  80         glEnd();
  81
  82         glDeleteTextures(1, &tex);
  83
  84         pass &= piglit_probe_pixel_rgb(12, 12, red);
  85         pass &= piglit_probe_pixel_rgb(18, 12, green);
  86         pass &= piglit_probe_pixel_rgb(12, 18, blue);
  87         pass &= piglit_probe_pixel_rgb(18, 18, red);
  88
  89         glutSwapBuffers();
  90
  91         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
  92 }
  93
  94
  95 static void reshape(int width, int height)
  96 {
  97         piglit_width = width;
  98         piglit_height = height;
  99
 100         piglit_ortho_projection(width, height, GL_FALSE);
 101 }
 102
 103 void
 104 piglit_init(int argc, char **argv)
 105 {
 106         reshape(piglit_width, piglit_height);
 107         piglit_require_extension("GL_ARB_pixel_buffer_object");
 108         glewInit();
 109 }