tests/fbo/fbo-generatemipmap.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 fbo-generatemipmap.c
  29  *
  30  * Tests that glGenerateMipmapEXT works correctly on a 2D texture.
  31  */
  32
  33 #include "piglit-util.h"
  34
  35 #define TEX_WIDTH 256
  36 #define TEX_HEIGHT 256
  37 int piglit_width = 700;
  38 int piglit_height = 300;
  39 int piglit_window_mode = GLUT_DOUBLE | GLUT_RGB;
  40
  41 static const float red[] =   {1, 0, 0, 0};
  42 static const float green[] = {0, 1, 0, 0};
  43 static const float blue[] =  {0, 0, 1, 0};
  44 static const float white[] = {1, 1, 1, 1};
  45
  46 static int
  47 create_fbo(void)
  48 {
  49         GLuint tex, fb;
  50         GLenum status;
  51         int i, dim;
  52
  53         glGenTextures(1, &tex);
  54         glBindTexture(GL_TEXTURE_2D, tex);
  55
  56         for (i = 0, dim = TEX_WIDTH; dim >0; i++, dim /= 2) {
  57                 glTexImage2D(GL_TEXTURE_2D, i, GL_RGBA,
  58                              dim, dim,
  59                              0,
  60                              GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  61         }
  62         assert(glGetError() == 0);
  63
  64         glGenFramebuffersEXT(1, &fb);
  65         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  66         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  67                                   GL_COLOR_ATTACHMENT0_EXT,
  68                                   GL_TEXTURE_2D,
  69                                   tex,
  70                                   0);
  71         assert(glGetError() == 0);
  72
  73         status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
  74         if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  75                 fprintf(stderr, "FBO incomplete\n");
  76                 goto done;
  77         }
  78
  79         glViewport(0, 0, TEX_WIDTH, TEX_HEIGHT);
  80         piglit_ortho_projection(TEX_WIDTH, TEX_HEIGHT, GL_FALSE);
  81
  82         glColor4fv(red);
  83         piglit_draw_rect(0, 0, TEX_WIDTH / 2, TEX_HEIGHT / 2);
  84         glColor4fv(green);
  85         piglit_draw_rect(TEX_WIDTH / 2, 0, TEX_WIDTH, TEX_HEIGHT / 2);
  86         glColor4fv(blue);
  87         piglit_draw_rect(0, TEX_HEIGHT / 2, TEX_WIDTH/2, TEX_HEIGHT);
  88         glColor4fv(white);
  89         piglit_draw_rect(TEX_WIDTH / 2, TEX_HEIGHT / 2, TEX_WIDTH, TEX_HEIGHT);
  90
  91         glGenerateMipmapEXT(GL_TEXTURE_2D);
  92 done:
  93         glDeleteFramebuffersEXT(1, &fb);
  94
  95         return tex;
  96 }
  97
  98 static void
  99 draw_mipmap(int x, int y, int dim)
 100 {
 101         glViewport(0, 0, piglit_width, piglit_height);
 102         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 103
 104         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
 105
 106         glEnable(GL_TEXTURE_2D);
 107         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 108         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
 109         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 110
 111         piglit_draw_rect_tex(x, y, dim, dim,
 112                              0, 0, 1, 1);
 113 }
 114
 115 static GLboolean
 116 test_mipmap_drawing(int start_x, int start_y, int dim)
 117 {
 118         GLboolean pass = GL_TRUE;
 119         int x, y;
 120
 121         for (y = 0; y < dim; y++) {
 122                 for (x = 0; x < dim; x++) {
 123                         const float *expected;
 124
 125                         if (x < dim / 2 && y < dim / 2)
 126                                 expected = red;
 127                         else if (y < dim / 2)
 128                                 expected = green;
 129                         else if (x < dim / 2)
 130                                 expected = blue;
 131                         else
 132                                 expected = white;
 133
 134                         pass = pass && piglit_probe_pixel_rgb(start_x + x,
 135                                                               start_y + y,
 136                                                               expected);
 137                 }
 138         }
 139
 140         return pass;
 141 }
 142
 143 enum piglit_result
 144 piglit_display(void)
 145 {
 146         GLboolean pass = GL_TRUE;
 147         int dim;
 148         GLuint tex;
 149         int x;
 150
 151         glClearColor(0.5, 0.5, 0.5, 0.5);
 152         glClear(GL_COLOR_BUFFER_BIT);
 153
 154         tex = create_fbo();
 155
 156         x = 1;
 157         for (dim = TEX_WIDTH; dim > 1; dim /= 2) {
 158                 draw_mipmap(x, 1, dim);
 159                 x += dim + 1;
 160         }
 161
 162         x = 1;
 163         for (dim = TEX_WIDTH; dim > 1; dim /= 2) {
 164                 pass &= test_mipmap_drawing(x, 1, dim);
 165                 x += dim + 1;
 166         }
 167
 168         glDeleteTextures(1, &tex);
 169
 170         glutSwapBuffers();
 171
 172         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 173 }
 174
 175 void piglit_init(int argc, char **argv)
 176 {
 177         piglit_require_extension("GL_EXT_framebuffer_object");
 178 }