tests/spec/ext_framebuffer_object/mipmap.c

   1 /*
   2  * Copyright (C) 2007  Intel Corporation
   3  * Copyright (C) 1999  Allen Akin   All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 /** @file mipmap.c
  26  *
  27  * Authors:  Shuang He <shuang.he@intel.com>
  28  *
  29  * Draw solid colors to all levels of a 2D texture. Then draw rectangles to
  30  * the framebuffer sampling from the texture.
  31  */
  32
  33 #include "piglit-util-gl.h"
  34
  35 #define TEXSIZE 64
  36
  37 enum { BLACK, RED, GREEN, BLUE, WHITE };
  38
  39 static const GLfloat colors[][4] = {{0.0, 0.0, 0.0, 0.0},
  40                                     {1.0, 0.0, 0.0, 1.0},
  41                                     {0.0, 1.0, 0.0, 1.0},
  42                                     {0.0, 0.0, 1.0, 1.0},
  43                                     {1.0, 1.0, 1.0, 1.0}};
  44
  45 PIGLIT_GL_TEST_CONFIG_BEGIN
  46
  47         config.supports_gl_compat_version = 11;
  48
  49         config.window_visual = PIGLIT_GL_VISUAL_RGB;
  50         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  51
  52 PIGLIT_GL_TEST_CONFIG_END
  53
  54 enum piglit_result
  55 piglit_display(void)
  56 {
  57         GLuint fbo;
  58         GLuint texture;
  59
  60         glGenFramebuffersEXT(1, &fbo);
  61         glGenTextures(1, &texture);
  62
  63         glBindTexture(GL_TEXTURE_2D, texture);
  64         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
  65         glDisable(GL_TEXTURE_2D);
  66
  67         for (int i = TEXSIZE, level = 0; i > 0; i /= 2, level++) {
  68
  69                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, level);
  70                 glTexImage2D(GL_TEXTURE_2D, level, GL_RGB, i, i, 0, GL_RGB,
  71                              GL_INT, NULL);
  72
  73                 glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  74                                           GL_COLOR_ATTACHMENT0_EXT,
  75                                           GL_TEXTURE_2D, texture, level);
  76
  77                 const GLenum e =
  78                         glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
  79                 if (e != GL_FRAMEBUFFER_COMPLETE_EXT) {
  80                         printf("FBO incomplete (%x): %s\n",
  81                                e, piglit_get_gl_enum_name(e));
  82                         return PIGLIT_FAIL;
  83                 }
  84
  85                 glColor4fv(colors[RED + (level % (WHITE - RED))]);
  86                 glClear(GL_COLOR_BUFFER_BIT);
  87
  88                 piglit_draw_rect(0, 0, TEXSIZE, TEXSIZE);
  89         }
  90
  91         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
  92         glEnable(GL_TEXTURE_2D);
  93
  94         /* Render to the window */
  95         glClear(GL_COLOR_BUFFER_BIT);
  96         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  97         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
  98                         GL_NEAREST_MIPMAP_NEAREST);
  99         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 100
 101         for (int i = TEXSIZE, x = 0; i > 0; i /= 2) {
 102                 piglit_draw_rect_tex(x, 0, i, i, 0, 0, 1, 1);
 103                 x += i;
 104                 assert(x < piglit_width);
 105         }
 106
 107         /* Check result */
 108         bool pass = true;
 109         for (int i = TEXSIZE, x = 0, level = 0;
 110              i > 1;
 111              x += i, i /= 2, level++) {
 112
 113                 if (!piglit_probe_pixel_rgb(
 114                             x, 0, colors[RED + (level % (WHITE - RED))])) {
 115                         printf("level = %d\n", level);
 116                         pass = false;
 117                 }
 118         }
 119
 120         piglit_present_results();
 121
 122         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 123 }
 124
 125 void
 126 piglit_init(int argc, char **argv)
 127 {
 128         piglit_require_extension("GL_EXT_framebuffer_object");
 129         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 130 }