tests/fbo/fbo-generatemipmap-npot.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 254
  36 #define TEX_HEIGHT 254
  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 x1 = start_x + dim / 4;
 120         int x2 = start_x + dim * 3 / 4;
 121         int y1 = start_y + dim / 4;
 122         int y2 = start_y + dim * 3 / 4;
 123
 124         pass &= piglit_probe_pixel_rgb(x1, y1, red);
 125         pass &= piglit_probe_pixel_rgb(x2, y1, green);
 126         pass &= piglit_probe_pixel_rgb(x1, y2, blue);
 127         pass &= piglit_probe_pixel_rgb(x2, y2, white);
 128
 129         return pass;
 130 }
 131
 132 enum piglit_result
 133 piglit_display(void)
 134 {
 135         GLboolean pass = GL_TRUE;
 136         int dim;
 137         GLuint tex;
 138         int x;
 139
 140         glClearColor(0.5, 0.5, 0.5, 0.5);
 141         glClear(GL_COLOR_BUFFER_BIT);
 142
 143         tex = create_fbo();
 144
 145         x = 1;
 146         for (dim = TEX_WIDTH; dim > 1; dim /= 2) {
 147                 draw_mipmap(x, 1, dim);
 148                 x += dim + 1;
 149         }
 150
 151         x = 1;
 152         for (dim = TEX_WIDTH; dim > 8; dim /= 2) {
 153                 pass &= test_mipmap_drawing(x, 1, dim);
 154                 x += dim + 1;
 155         }
 156
 157         glDeleteTextures(1, &tex);
 158
 159         glutSwapBuffers();
 160
 161         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 162 }
 163
 164 void piglit_init(int argc, char **argv)
 165 {
 166         piglit_require_extension("GL_EXT_framebuffer_object");
 167         piglit_require_extension("GL_ARB_texture_non_power_of_two");
 168 }