tests/texturing/gen-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-teximage.c
  30  *
  31  * Tests that:
  32  * - The full mipmap tree is generated when level 0 is set in a new
  33  *   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.h"
  40
  41 int piglit_width = 512, piglit_height = 512;
  42 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  43
  44 #define SIZE 128
  45
  46 static void display_mipmaps(int start_x, int start_y)
  47 {
  48         int i;
  49
  50         /* Disply all the mipmap levels */
  51         for (i = SIZE; i > 0; i /= 2) {
  52                 glBegin(GL_QUADS);
  53                 glTexCoord2f(0.0, 0.0); glVertex2f(start_x + 0, start_y + 0);
  54                 glTexCoord2f(1.0, 0.0); glVertex2f(start_x + i, start_y + 0);
  55                 glTexCoord2f(1.0, 1.0); glVertex2f(start_x + i, start_y + i);
  56                 glTexCoord2f(0.0, 1.0); glVertex2f(start_x + 0, start_y + i);
  57                 glEnd();
  58
  59                 start_x += i;
  60         }
  61 }
  62
  63 static void fill_level(int level, const GLfloat *color)
  64 {
  65         GLfloat *data;
  66         int size = SIZE / (1 << level);
  67         int i;
  68
  69         /* Update a square inside the texture to red */
  70         data = malloc(size * size * 4 * sizeof(GLfloat));
  71         for (i = 0; i < 4 * size * size; i += 4) {
  72                 data[i + 0] = color[0];
  73                 data[i + 1] = color[1];
  74                 data[i + 2] = color[2];
  75                 data[i + 3] = color[3];
  76         }
  77         glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, size, size, 0,
  78                      GL_RGBA, GL_FLOAT, data);
  79         free(data);
  80 }
  81
  82 static GLboolean check_resulting_mipmaps(int x, int y, const GLfloat *color)
  83 {
  84         GLboolean pass = GL_TRUE;
  85         int i;
  86
  87         for (i = SIZE; i > 4; i /= 2) {
  88                 pass = pass && piglit_probe_pixel_rgb(x + i / 2, y + i / 2,
  89                                                       color);
  90                 x += i;
  91         }
  92
  93         return pass;
  94 }
  95
  96 enum piglit_result
  97 piglit_display(void)
  98 {
  99         GLboolean pass = GL_TRUE;
 100         const GLfloat red[4] = {1.0, 0.0, 0.0, 0.0};
 101         const GLfloat blue[4] = {0.0, 0.0, 1.0, 0.0};
 102         GLuint texture;
 103         int i;
 104
 105         glClearColor(0, 0, 0, 0);
 106         glClear(GL_COLOR_BUFFER_BIT);
 107
 108         /* Set up a texture object with mipmap generation */
 109         glGenTextures(1, &texture);
 110         glBindTexture(GL_TEXTURE_2D, texture);
 111
 112         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 113         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 114         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 115         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 116                         GL_LINEAR_MIPMAP_NEAREST);
 117         glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
 118
 119         /* Set the first level of the new texture to red and display. */
 120         fill_level(0, red);
 121         display_mipmaps(0, 0);
 122
 123         glDeleteTextures(1, &texture);
 124
 125         /* Set up texture object without mipmap generation */
 126         glGenTextures(1, &texture);
 127         glBindTexture(GL_TEXTURE_2D, texture);
 128
 129         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 130         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 131         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 132         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 133                         GL_LINEAR_MIPMAP_NEAREST);
 134
 135         /* Paint normal blue mipmap set */
 136         for (i = 0; SIZE / (1 << i) > 0; i++)
 137                 fill_level(i, blue);
 138
 139         display_mipmaps(0, SIZE);
 140
 141         /* Enable GENERATE_MIPMAP and set the first (and thus all) levels to
 142          * red.
 143          */
 144         glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
 145         fill_level(0, red);
 146         display_mipmaps(0, SIZE * 2);
 147
 148         glDeleteTextures(1, &texture);
 149
 150         glutSwapBuffers();
 151         glFlush();
 152
 153         pass = pass && check_resulting_mipmaps(0, 0, red);
 154         pass = pass && check_resulting_mipmaps(0, SIZE, blue);
 155         pass = pass && check_resulting_mipmaps(0, SIZE * 2, red);
 156
 157         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 158 }
 159
 160 void
 161 piglit_init(int argc, char **argv)
 162 {
 163         piglit_require_extension("GL_SGIS_generate_mipmap");
 164
 165         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 166
 167         glEnable(GL_TEXTURE_2D);
 168 }