tests/texturing/mipmap-setup.c

   1 /*
   2  * Copyright 2010 VMware, Inc.
   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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /*
  25  * Test building a mipmap in various orders:
  26  *   From largest to smallest
  27  *   From smallest to largest
  28  *   Random order.
  29  *
  30  * Author: Brian Paul
  31  */
  32
  33
  34 #include "piglit-util-gl.h"
  35
  36 PIGLIT_GL_TEST_CONFIG_BEGIN
  37
  38         config.supports_gl_compat_version = 10;
  39
  40         config.window_width = 200;
  41         config.window_height = 200;
  42         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  43         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  44
  45 PIGLIT_GL_TEST_CONFIG_END
  46
  47 #define MAX_LEVEL 7
  48
  49 enum order {
  50    NORMAL,
  51    REVERSE,
  52    RANDOM
  53 };
  54
  55
  56 static GLubyte
  57 level_intensity(GLint level)
  58 {
  59    return 100 + level * 20;
  60 }
  61
  62
  63 static void
  64 setup_tex_image(GLint level)
  65 {
  66    GLint size = 1 << (MAX_LEVEL - level);
  67    GLubyte *img = malloc(size * size * 4);
  68    GLubyte val = level_intensity(level);
  69    memset(img, val, size * size * 4);
  70    glTexImage2D(GL_TEXTURE_2D, level, GL_RGB, size, size, 0,
  71                 GL_RGBA, GL_UNSIGNED_BYTE, img);
  72    free(img);
  73 }
  74
  75
  76 /*
  77  * Generate a mipmapped texture.
  78  * Define the mipmap levels/images in the order specified by 'ord'.
  79  */
  80 static void
  81 generate_mipmap(enum order ord)
  82 {
  83    GLuint tex;
  84    GLint level;
  85
  86    glGenTextures(1, &tex);
  87    glBindTexture(GL_TEXTURE_2D, tex);
  88
  89    /* hint to the driver that there won't be a mipmap (but that's a lie) */
  90    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  91    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  92
  93    /* Set each mipmap level to a different intensity, starting with the
  94     * smallest mipmap level and ending with the largest at level=0.
  95     */
  96    if (ord == NORMAL) {
  97       for (level = 0; level <= MAX_LEVEL; level++) {
  98          setup_tex_image(level);
  99       }
 100    }
 101    else if (ord == REVERSE) {
 102       for (level = MAX_LEVEL; level >= 0; level--) {
 103          setup_tex_image(level);
 104       }
 105    }
 106    else {
 107       static const GLuint rand[MAX_LEVEL + 1] = {3, 1, 2, 4, 7, 0, 6, 5};
 108       assert(ord == RANDOM);
 109
 110       for (level = 0; level <= MAX_LEVEL; level++) {
 111          setup_tex_image(rand[level]);
 112       }
 113    }
 114
 115    /* use mipmap filtering */
 116    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
 117    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 118 }
 119
 120
 121 static GLboolean
 122 test(enum order ord, const char *order)
 123 {
 124    const int px = piglit_width / 2, py = piglit_height / 2;
 125    GLboolean pass = GL_TRUE;
 126    GLuint level;
 127
 128    generate_mipmap(ord);
 129
 130    glEnable(GL_TEXTURE_2D);
 131
 132    /* render a test polygon for each mipmap level */
 133    for (level = 0; level <= MAX_LEVEL; level++) {
 134       float expected[4];
 135       int p;
 136
 137       expected[0] = expected[1] = expected[2] = level_intensity(level) / 255.0;
 138
 139       /* force sampling from a specific mipmap level */
 140       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, level);
 141       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, level);
 142
 143       glClear(GL_COLOR_BUFFER_BIT);
 144
 145       glBegin(GL_POLYGON);
 146       glTexCoord2f(0, 0);
 147       glVertex2f(-1, -1);
 148       glTexCoord2f(1, 0);
 149       glVertex2f(1, -1);
 150       glTexCoord2f(1, 1);
 151       glVertex2f(1, 1);
 152       glTexCoord2f(0, 1);
 153       glVertex2f(-1, 1);
 154       glEnd();
 155
 156       p = piglit_probe_pixel_rgb(px, py, expected);
 157       if (!p) {
 158          printf("  At mipmap level %d, order = %s\n", level, order);
 159       }
 160
 161       pass &= p;
 162
 163       piglit_present_results();
 164    }
 165
 166    return pass;
 167 }
 168
 169
 170 void
 171 piglit_init(int argc, char **argv)
 172 {
 173    /* nothing */
 174 }
 175
 176
 177 enum piglit_result
 178 piglit_display(void)
 179 {
 180    if (!test(NORMAL, "Normal"))
 181       return PIGLIT_FAIL;
 182
 183    if (!test(REVERSE, "Reverse"))
 184       return PIGLIT_FAIL;
 185
 186    if (!test(RANDOM, "Random"))
 187       return PIGLIT_FAIL;
 188
 189    return PIGLIT_PASS;
 190 }