tests/fbo/fbo-cubemap.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-cubemap.c
  29  *
  30  * Tests that drawing to each face of a cube map FBO and then drawing views
  31  * of those faces to the window system framebuffer succeeds.
  32  */
  33
  34 #include "piglit-util-gl.h"
  35
  36 #define BUF_WIDTH 32
  37 #define BUF_HEIGHT 32
  38
  39 PIGLIT_GL_TEST_CONFIG_BEGIN
  40
  41         config.supports_gl_compat_version = 10;
  42
  43         config.window_width = 200;
  44         config.window_height = 100;
  45         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  46         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  47
  48 PIGLIT_GL_TEST_CONFIG_END
  49
  50 float face_color[7][4] = {
  51         {1.0, 0.0, 0.0, 0.0},
  52         {0.0, 1.0, 0.0, 0.0},
  53         {0.0, 0.0, 1.0, 0.0},
  54         {1.0, 0.0, 1.0, 0.0},
  55         {1.0, 1.0, 0.0, 0.0},
  56         {0.0, 1.0, 1.0, 0.0},
  57         {1.0, 1.0, 1.0, 0.0},
  58 };
  59
  60 static float *get_face_color(int face, int level)
  61 {
  62         return face_color[(face + 2 * level) % 7];
  63 }
  64
  65 static int
  66 create_cube_fbo(void)
  67 {
  68         GLuint tex, fb;
  69         GLenum status;
  70         int face, dim;
  71
  72         glGenTextures(1, &tex);
  73         glBindTexture(GL_TEXTURE_CUBE_MAP, tex);
  74
  75         for (face = 0; face < 6; face++) {
  76                 int level = 0;
  77
  78                 for (dim = BUF_WIDTH; dim > 0; dim /= 2) {
  79                         glTexImage2D(cube_face_targets[face], level, GL_RGBA,
  80                                      dim, dim,
  81                                      0,
  82                                      GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  83                         level++;
  84                 }
  85         }
  86         if (!piglit_check_gl_error(GL_NO_ERROR))
  87                 piglit_report_result(PIGLIT_FAIL);
  88
  89         glGenFramebuffersEXT(1, &fb);
  90         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  91
  92         for (face = 0; face < 6; face++) {
  93                 int level = 0;
  94
  95                 for (dim = BUF_WIDTH; dim > 0; dim /= 2) {
  96                         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  97                                                   GL_COLOR_ATTACHMENT0_EXT,
  98                                                   cube_face_targets[face],
  99                                                   tex,
 100                                                   level);
 101
 102                         if (!piglit_check_gl_error(GL_NO_ERROR))
 103                                 piglit_report_result(PIGLIT_FAIL);
 104
 105                         status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
 106                         if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 107                                 fprintf(stderr, "FBO incomplete\n");
 108                                 goto done;
 109                         }
 110
 111                         glViewport(0, 0, dim, dim);
 112                         piglit_ortho_projection(dim, dim, GL_FALSE);
 113
 114                         glColor4fv(get_face_color(face, level));
 115                         /* Draw a little outside the bounds to make
 116                          * sure clipping's working.
 117                          */
 118                         piglit_draw_rect(-2, -2, dim + 2, dim + 2);
 119
 120                         level++;
 121                 }
 122         }
 123
 124
 125 done:
 126         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
 127         glDeleteFramebuffersEXT(1, &fb);
 128
 129         return tex;
 130 }
 131
 132 static void
 133 draw_face(int x, int y, int dim, int face)
 134 {
 135         glViewport(0, 0, piglit_width, piglit_height);
 136         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 137
 138         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
 139
 140         glEnable(GL_TEXTURE_CUBE_MAP);
 141         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 142         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
 143         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 144
 145         glBegin(GL_QUADS);
 146
 147         glTexCoord3fv(cube_face_texcoords[face][0]);
 148         glVertex2f(x, y);
 149
 150         glTexCoord3fv(cube_face_texcoords[face][1]);
 151         glVertex2f(x + dim, y);
 152
 153         glTexCoord3fv(cube_face_texcoords[face][2]);
 154         glVertex2f(x + dim, y + dim);
 155
 156         glTexCoord3fv(cube_face_texcoords[face][3]);
 157         glVertex2f(x, y + dim);
 158
 159         glEnd();
 160
 161         glDisable(GL_TEXTURE_CUBE_MAP);
 162 }
 163
 164 static GLboolean test_face_drawing(int start_x, int start_y, int dim,
 165                                    float *expected)
 166 {
 167         return piglit_probe_rect_rgb(start_x, start_y, dim, dim, expected);
 168 }
 169
 170 enum piglit_result
 171 piglit_display(void)
 172 {
 173         GLboolean pass = GL_TRUE;
 174         int face, dim;
 175         GLuint tex;
 176
 177         glClearColor(0.5, 0.5, 0.5, 0.5);
 178         glClear(GL_COLOR_BUFFER_BIT);
 179
 180         tex = create_cube_fbo();
 181
 182         for (face = 0; face < 6; face++) {
 183                 int x = 1 + face * (BUF_WIDTH + 1);
 184                 int y = 1;
 185
 186                 for (dim = BUF_WIDTH; dim > 0; dim /= 2) {
 187                         draw_face(x, y, dim, face);
 188                         y += dim + 1;
 189                 }
 190         }
 191
 192         for (face = 0; face < 6; face++) {
 193                 int x = 1 + face * (BUF_WIDTH + 1);
 194                 int y = 1;
 195                 int level = 0;
 196
 197                 for (dim = BUF_WIDTH; dim > 2; dim >>= 1) {
 198                         pass &= test_face_drawing(x, y, dim,
 199                                                   get_face_color(face, level));
 200                         y += dim + 1;
 201                         level++;
 202                 }
 203         }
 204
 205         glDeleteTextures(1, &tex);
 206
 207         piglit_present_results();
 208
 209         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 210 }
 211
 212 void piglit_init(int argc, char **argv)
 213 {
 214         piglit_require_extension("GL_EXT_framebuffer_object");
 215         piglit_require_extension("GL_ARB_texture_cube_map");
 216 }