tests/fbo/fbo-generatemipmap-filtering.c

   1 /*
   2  * Copyright © 2009,2011 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
  24 /** @file fbo-generatemipmap.c
  25  *
  26  * Tests that glGenerateMipmapEXT uses appropriate filtering for a 2D texture.
  27  */
  28
  29 #include "piglit-util-gl.h"
  30
  31 #define TEX_WIDTH 256
  32 #define TEX_HEIGHT 256
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35
  36         config.supports_gl_compat_version = 10;
  37
  38         config.window_width = 700;
  39         config.window_height = 300;
  40         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  41         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  42
  43 PIGLIT_GL_TEST_CONFIG_END
  44
  45 static int
  46 create_tex(void)
  47 {
  48         GLuint tex;
  49         uint8_t data[TEX_WIDTH * TEX_HEIGHT * 4];
  50         int x, y;
  51
  52         glGenTextures(1, &tex);
  53         glBindTexture(GL_TEXTURE_2D, tex);
  54
  55         for (y = 0; y < TEX_HEIGHT; y++) {
  56                 for (x = 0; x < TEX_WIDTH; x++) {
  57                         uint8_t *p = data + (y * TEX_WIDTH + x) * 4;
  58
  59                         if ((x + 1) % 8 < 4) {
  60                                 p[0] = 255;
  61                                 p[1] = 0;
  62                         } else {
  63                                 p[0] = 0;
  64                                 p[1] = 255;
  65                         }
  66                         p[2] = 0;
  67                         p[3] = 255;
  68                 }
  69         }
  70
  71         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
  72                      TEX_WIDTH, TEX_HEIGHT,
  73                      0,
  74                      GL_RGBA, GL_UNSIGNED_BYTE, data);
  75
  76         /* Leave the worst possible filtering setup in place for calling
  77          * glGenerateMipmap.
  78          */
  79         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  80         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  81
  82         glGenerateMipmapEXT(GL_TEXTURE_2D);
  83
  84         return tex;
  85 }
  86
  87 static void
  88 draw_mipmap(int x, int y, int dim)
  89 {
  90         glViewport(0, 0, piglit_width, piglit_height);
  91         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  92
  93         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
  94
  95         glEnable(GL_TEXTURE_2D);
  96         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
  97         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
  98         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  99
 100         piglit_draw_rect_tex(x, y, dim, dim,
 101                              0, 0, 1, 1);
 102         glDisable(GL_TEXTURE_2D);
 103 }
 104
 105 enum piglit_result
 106 piglit_display(void)
 107 {
 108         GLboolean pass = GL_TRUE;
 109         int dim;
 110         GLuint tex;
 111         int x;
 112         float blend[] = {0.5, 0.5, 0.0, 1.0};
 113
 114         glClearColor(0.5, 0.5, 0.5, 0.5);
 115         glClear(GL_COLOR_BUFFER_BIT);
 116
 117         tex = create_tex();
 118
 119         x = 1;
 120         for (dim = TEX_WIDTH; dim > 1; dim /= 2) {
 121                 draw_mipmap(x, 1, dim);
 122                 x += dim + 1;
 123         }
 124
 125         x = 1;
 126         for (dim = TEX_WIDTH; dim > 1; dim /= 2) {
 127                 if (dim < TEX_WIDTH / 4) {
 128                         pass &= piglit_probe_rect_rgba(x, 1, dim, dim,
 129                                                        blend);
 130                 }
 131
 132                 x += dim + 1;
 133         }
 134
 135         glDeleteTextures(1, &tex);
 136
 137         piglit_present_results();
 138
 139         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 140 }
 141
 142 void piglit_init(int argc, char **argv)
 143 {
 144         piglit_require_extension("GL_EXT_framebuffer_object");
 145 }