tests/fbo/fbo-generatemipmap-nonsquare.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  * Modified by Marek Olšák <maraeo@gmail.com> to reproduce FDO bug #27338.
  33  */
  34
  35 #include "piglit-util.h"
  36
  37 #define TEX_WIDTH 256
  38 #define TEX_HEIGHT 64
  39 #define TEX_DIFF (TEX_WIDTH/TEX_HEIGHT)
  40 int piglit_width = 700;
  41 int piglit_height = 300;
  42 int piglit_window_mode = GLUT_DOUBLE | GLUT_RGB;
  43
  44 static const float red[] =   {1, 0, 0, 0};
  45 static const float green[] = {0, 1, 0, 0};
  46 static const float blue[] =  {0, 0, 1, 0};
  47 static const float white[] = {1, 1, 1, 1};
  48
  49 static int
  50 create_fbo(void)
  51 {
  52         GLuint tex, fb;
  53         GLenum status;
  54         int i, dim, dimy;
  55
  56         glGenTextures(1, &tex);
  57         glBindTexture(GL_TEXTURE_2D, tex);
  58
  59         for (i = 0, dim = TEX_WIDTH; dim >0; i++, dim /= 2) {
  60             dimy = dim/TEX_DIFF;
  61             if (dimy == 0) dimy = 1;
  62
  63                 glTexImage2D(GL_TEXTURE_2D, i, GL_RGBA,
  64                              dim, dimy,
  65                              0,
  66                              GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  67         }
  68         assert(glGetError() == 0);
  69
  70         glGenFramebuffersEXT(1, &fb);
  71         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  72         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  73                                   GL_COLOR_ATTACHMENT0_EXT,
  74                                   GL_TEXTURE_2D,
  75                                   tex,
  76                                   0);
  77         assert(glGetError() == 0);
  78
  79         status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
  80         if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  81                 fprintf(stderr, "FBO incomplete\n");
  82                 goto done;
  83         }
  84
  85         glViewport(0, 0, TEX_WIDTH, TEX_HEIGHT);
  86         piglit_ortho_projection(TEX_WIDTH, TEX_HEIGHT, GL_FALSE);
  87
  88         glColor4fv(red);
  89         piglit_draw_rect(0, 0, TEX_WIDTH / 2, TEX_HEIGHT / 2);
  90         glColor4fv(green);
  91         piglit_draw_rect(TEX_WIDTH / 2, 0, TEX_WIDTH, TEX_HEIGHT / 2);
  92         glColor4fv(blue);
  93         piglit_draw_rect(0, TEX_HEIGHT / 2, TEX_WIDTH/2, TEX_HEIGHT);
  94         glColor4fv(white);
  95         piglit_draw_rect(TEX_WIDTH / 2, TEX_HEIGHT / 2, TEX_WIDTH, TEX_HEIGHT);
  96
  97         glGenerateMipmapEXT(GL_TEXTURE_2D);
  98 done:
  99         glDeleteFramebuffersEXT(1, &fb);
 100
 101         return tex;
 102 }
 103
 104 static void
 105 draw_mipmap(int x, int y, int dim)
 106 {
 107         glViewport(0, 0, piglit_width, piglit_height);
 108         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 109
 110         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
 111
 112         glEnable(GL_TEXTURE_2D);
 113         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 114         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
 115         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 116
 117         piglit_draw_rect_tex(x, y, dim, dim,
 118                              0, 0, 1, 1);
 119 }
 120
 121 static GLboolean
 122 test_mipmap_drawing(int start_x, int start_y, int dim)
 123 {
 124         GLboolean pass = GL_TRUE;
 125         int x, y;
 126
 127         for (y = 0; y < dim; y++) {
 128                 for (x = 0; x < dim; x++) {
 129                         const float *expected;
 130
 131                         if (x < dim / 2 && y < dim / 2)
 132                                 expected = red;
 133                         else if (y < dim / 2)
 134                                 expected = green;
 135                         else if (x < dim / 2)
 136                                 expected = blue;
 137                         else
 138                                 expected = white;
 139
 140                         pass = pass && piglit_probe_pixel_rgb(start_x + x,
 141                                                               start_y + y,
 142                                                               expected);
 143                 }
 144         }
 145
 146         return pass;
 147 }
 148
 149 enum piglit_result
 150 piglit_display(void)
 151 {
 152         GLboolean pass = GL_TRUE;
 153         int dim;
 154         GLuint tex;
 155         int x;
 156
 157         glClearColor(0.5, 0.5, 0.5, 0.5);
 158         glClear(GL_COLOR_BUFFER_BIT);
 159
 160         tex = create_fbo();
 161
 162         x = 1;
 163         for (dim = TEX_WIDTH; dim > TEX_DIFF; dim /= 2) {
 164                 draw_mipmap(x, 1, dim);
 165                 x += dim + 1;
 166         }
 167
 168         x = 1;
 169         for (dim = TEX_WIDTH; dim > TEX_DIFF; dim /= 2) {
 170                 pass &= test_mipmap_drawing(x, 1, dim);
 171                 x += dim + 1;
 172         }
 173
 174         glDeleteTextures(1, &tex);
 175
 176         glutSwapBuffers();
 177
 178         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 179 }
 180
 181 void piglit_init(int argc, char **argv)
 182 {
 183         piglit_require_extension("GL_EXT_framebuffer_object");
 184 }