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-gl.h"
  34
  35 #define TEX_WIDTH 256
  36 #define TEX_HEIGHT 256
  37
  38 PIGLIT_GL_TEST_CONFIG_BEGIN
  39
  40         config.supports_gl_compat_version = 10;
  41
  42         config.window_width = 700;
  43         config.window_height = 300;
  44         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  45         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  46
  47 PIGLIT_GL_TEST_CONFIG_END
  48
  49 static const float red[] =   {1, 0, 0, 0};
  50 static const float green[] = {0, 1, 0, 0};
  51 static const float blue[] =  {0, 0, 1, 0};
  52 static const float white[] = {1, 1, 1, 1};
  53
  54 static int
  55 create_fbo(void)
  56 {
  57         GLuint tex, fb;
  58         GLenum status;
  59         int i, dim;
  60
  61         glGenTextures(1, &tex);
  62         glBindTexture(GL_TEXTURE_2D, tex);
  63
  64         for (i = 0, dim = TEX_WIDTH; dim >0; i++, dim /= 2) {
  65                 glTexImage2D(GL_TEXTURE_2D, i, GL_RGBA,
  66                              dim, dim,
  67                              0,
  68                              GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  69         }
  70         if (!piglit_check_gl_error(GL_NO_ERROR))
  71                 piglit_report_result(PIGLIT_FAIL);
  72
  73         glGenFramebuffersEXT(1, &fb);
  74         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  75         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  76                                   GL_COLOR_ATTACHMENT0_EXT,
  77                                   GL_TEXTURE_2D,
  78                                   tex,
  79                                   0);
  80         if (!piglit_check_gl_error(GL_NO_ERROR))
  81                 piglit_report_result(PIGLIT_FAIL);
  82
  83         status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
  84         if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  85                 fprintf(stderr, "FBO incomplete\n");
  86                 goto done;
  87         }
  88
  89         glViewport(0, 0, TEX_WIDTH, TEX_HEIGHT);
  90         piglit_ortho_projection(TEX_WIDTH, TEX_HEIGHT, GL_FALSE);
  91
  92         glColor4fv(red);
  93         piglit_draw_rect(0, 0, TEX_WIDTH / 2, TEX_HEIGHT / 2);
  94         glColor4fv(green);
  95         piglit_draw_rect(TEX_WIDTH / 2, 0, TEX_WIDTH, TEX_HEIGHT / 2);
  96         glColor4fv(blue);
  97         piglit_draw_rect(0, TEX_HEIGHT / 2, TEX_WIDTH/2, TEX_HEIGHT);
  98         glColor4fv(white);
  99         piglit_draw_rect(TEX_WIDTH / 2, TEX_HEIGHT / 2, TEX_WIDTH, TEX_HEIGHT);
 100
 101         glGenerateMipmapEXT(GL_TEXTURE_2D);
 102 done:
 103         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
 104         glDeleteFramebuffersEXT(1, &fb);
 105
 106         return tex;
 107 }
 108
 109 static void
 110 draw_mipmap(int x, int y, int dim)
 111 {
 112         glViewport(0, 0, piglit_width, piglit_height);
 113         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 114
 115         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
 116
 117         glEnable(GL_TEXTURE_2D);
 118         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 119         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
 120         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 121
 122         piglit_draw_rect_tex(x, y, dim, dim,
 123                              0, 0, 1, 1);
 124         glDisable(GL_TEXTURE_2D);
 125 }
 126
 127 static GLboolean
 128 test_mipmap_drawing(int start_x, int start_y, int dim)
 129 {
 130         GLboolean pass = GL_TRUE;
 131         pass = pass && piglit_probe_rect_rgb(
 132                         start_x, start_y, dim/2, dim/2, red);
 133         pass = pass && piglit_probe_rect_rgb(
 134                         start_x + dim/2, start_y, dim/2, dim/2, green);
 135         pass = pass && piglit_probe_rect_rgb(
 136                         start_x, start_y + dim/2, dim/2, dim/2, blue);
 137         pass = pass && piglit_probe_rect_rgb(
 138                         start_x + dim/2, start_y + dim/2, dim/2, dim/2, white);
 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         piglit_present_results();
 171
 172         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 173 }
 174
 175 void piglit_init(int argc, char **argv)
 176 {
 177         piglit_require_extension("GL_EXT_framebuffer_object");
 178 }