tests/texturing/gen-compressed-teximage.c

   1 /*
   2  * Copyright © 2008 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  *    Chris Lord <chris@openedhand.com>
  25  *    Eric Anholt <eric@anholt.net>
  26  *
  27  */
  28
  29 /** @file gen-compressed-teximage.c
  30  *
  31  * Tests that:
  32  * - The full mipmap tree is generated when level 0 is set in a new
  33  *   S3TC texture object.
  34  * - Changing GL_GENERATE_MIPMAP state flushes previous vertices.
  35  * - The full mipmap tree is regenerated when level 0 is updated in an
  36  *   existing texture.
  37  */
  38
  39 #include "piglit-util-gl.h"
  40
  41 PIGLIT_GL_TEST_CONFIG_BEGIN
  42
  43         config.supports_gl_compat_version = 10;
  44
  45         config.window_width = 512;
  46         config.window_height = 512;
  47         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  48         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  49
  50 PIGLIT_GL_TEST_CONFIG_END
  51
  52 #define SIZE 128
  53
  54 static void display_mipmaps(int start_x, int start_y)
  55 {
  56         int i;
  57
  58         /* Disply all the mipmap levels */
  59         for (i = SIZE; i > 0; i /= 2) {
  60                 glBegin(GL_QUADS);
  61                 glTexCoord2f(0.0, 0.0); glVertex2f(start_x + 0, start_y + 0);
  62                 glTexCoord2f(1.0, 0.0); glVertex2f(start_x + i, start_y + 0);
  63                 glTexCoord2f(1.0, 1.0); glVertex2f(start_x + i, start_y + i);
  64                 glTexCoord2f(0.0, 1.0); glVertex2f(start_x + 0, start_y + i);
  65                 glEnd();
  66
  67                 start_x += i;
  68         }
  69 }
  70
  71 static void fill_level(int level, const GLfloat *color)
  72 {
  73         GLfloat *data;
  74         int size = SIZE / (1 << level);
  75         int i;
  76
  77         /* Update a square inside the texture to red */
  78         data = malloc(size * size * 4 * sizeof(GLfloat));
  79         for (i = 0; i < 4 * size * size; i += 4) {
  80                 data[i + 0] = color[0];
  81                 data[i + 1] = color[1];
  82                 data[i + 2] = color[2];
  83                 data[i + 3] = color[3];
  84         }
  85         glTexImage2D(GL_TEXTURE_2D, level, GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
  86                      size, size, 0,
  87                      GL_RGBA, GL_FLOAT, data);
  88         free(data);
  89 }
  90
  91 static GLboolean check_resulting_mipmaps(int x, int y, const GLfloat *color)
  92 {
  93         GLboolean pass = GL_TRUE;
  94         int i;
  95
  96         for (i = SIZE; i > 0; i /= 2) {
  97                 pass = pass && piglit_probe_pixel_rgb(x + i / 2, y + i / 2,
  98                                                       color);
  99                 x += i;
 100         }
 101
 102         return pass;
 103 }
 104
 105 enum piglit_result
 106 piglit_display(void)
 107 {
 108         const GLfloat red[4] = {1.0, 0.0, 0.0, 0.0};
 109         const GLfloat blue[4] = {0.0, 0.0, 1.0, 0.0};
 110         GLuint texture;
 111         int i;
 112         GLboolean pass = GL_TRUE;
 113
 114         glClearColor(0, 0, 0, 0);
 115         glClear(GL_COLOR_BUFFER_BIT);
 116
 117         /* Set up a texture object with mipmap generation */
 118         glGenTextures(1, &texture);
 119         glBindTexture(GL_TEXTURE_2D, texture);
 120
 121         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 122         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 123         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 124         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 125                         GL_LINEAR_MIPMAP_NEAREST);
 126         glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
 127
 128         /* Set the first level of the new texture to red and display. */
 129         fill_level(0, red);
 130         display_mipmaps(0, 0);
 131
 132         glDeleteTextures(1, &texture);
 133
 134         /* Set up texture object without mipmap generation */
 135         glGenTextures(1, &texture);
 136         glBindTexture(GL_TEXTURE_2D, texture);
 137
 138         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 139         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 140         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 141         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 142                         GL_LINEAR_MIPMAP_NEAREST);
 143
 144         /* Paint normal blue mipmap set */
 145         for (i = 0; SIZE / (1 << i) > 0; i++)
 146                 fill_level(i, blue);
 147
 148         display_mipmaps(0, SIZE);
 149
 150         /* Enable GENERATE_MIPMAP and set the first (and thus all) levels to
 151          * red.
 152          */
 153         glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
 154         fill_level(0, red);
 155         display_mipmaps(0, SIZE * 2);
 156
 157         glDeleteTextures(1, &texture);
 158
 159         pass = pass && check_resulting_mipmaps(0, 0, red);
 160         pass = pass && check_resulting_mipmaps(0, SIZE, blue);
 161         pass = pass && check_resulting_mipmaps(0, SIZE * 2, red);
 162
 163         piglit_present_results();
 164         glFlush();
 165
 166         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 167 }
 168
 169 void
 170 piglit_init(int argc, char **argv)
 171 {
 172         piglit_require_extension("GL_SGIS_generate_mipmap");
 173         piglit_require_extension("GL_EXT_texture_compression_s3tc");
 174
 175         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 176
 177         glEnable(GL_TEXTURE_2D);
 178 }