tests/shaders/glsl-fs-texturecube.c

   1 /*
   2  * Copyright © 2010 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 glsl-fs-texturecube.c
  29  *
  30  * Tests that we can access cubemaps in the fragment shader.
  31  */
  32
  33 #include "piglit-util-gl.h"
  34
  35 PIGLIT_GL_TEST_CONFIG_BEGIN
  36
  37         config.supports_gl_compat_version = 10;
  38
  39         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  40
  41 PIGLIT_GL_TEST_CONFIG_END
  42
  43 static GLint prog;
  44
  45 static GLfloat colors[][3] = {
  46         {1.0, 1.0, 1.0},
  47         {1.0, 1.0, 0.0},
  48         {1.0, 0.0, 0.0},
  49         {1.0, 0.0, 1.0},
  50         {0.0, 0.0, 1.0},
  51         {0.0, 1.0, 1.0},
  52         {0.0, 1.0, 0.0},
  53 };
  54
  55
  56 static void
  57 set_face_image(GLenum face, int size, int color)
  58 {
  59         GLfloat *color1 = colors[color];
  60         GLfloat *color2 = colors[(color + 1) % ARRAY_SIZE(colors)];
  61         GLfloat *tex;
  62         int x, y;
  63
  64         tex = malloc(size * size * 3 * sizeof(GLfloat));
  65
  66         /* Set the texture for this face to one corner being color2 and the
  67          * rest color1.  If the texture is 1x1, then it's all color1.
  68          */
  69         for (y = 0; y < size; y++) {
  70                 for (x = 0; x < size; x++) {
  71                         GLfloat *chosen_color;
  72
  73                         if (y >= (size / 2) || x >= (size / 2))
  74                                 chosen_color = color1;
  75                         else
  76                                 chosen_color = color2;
  77
  78                         tex[(y * size + x) * 3 + 0] = chosen_color[0];
  79                         tex[(y * size + x) * 3 + 1] = chosen_color[1];
  80                         tex[(y * size + x) * 3 + 2] = chosen_color[2];
  81                 }
  82         }
  83
  84         glTexImage2D(face, 0, GL_RGB, size, size, 0, GL_RGB, GL_FLOAT, tex);
  85
  86         free(tex);
  87 }
  88
  89
  90 enum piglit_result
  91 piglit_display(void)
  92 {
  93         GLboolean pass = GL_TRUE;
  94         GLuint tex;
  95         int face;
  96
  97         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  98
  99         /* Create the texture. */
 100         glGenTextures(1, &tex);
 101         glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, tex);
 102
 103         glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB,
 104                         GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 105         glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB,
 106                         GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 107         glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB,
 108                         GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 109         glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB,
 110                         GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 111
 112         /* Fill in faces on each level */
 113         for (face = 0; face < 6; face++) {
 114                 set_face_image(cube_face_targets[face], 32, face);
 115         }
 116
 117         glEnable(GL_TEXTURE_CUBE_MAP_ARB);
 118
 119         for (face = 0; face < 6; face++) {
 120                 int x1 = piglit_width * face / 6;
 121                 int x2 = piglit_width * (face + 1) / 6;
 122                 int y1 = 0;
 123                 int y2 = piglit_height;
 124                 int tx1 = x1 + 1;
 125                 int tx2 = x2 - 1;
 126                 int ty1 = y1 + 1;
 127                 int ty2 = y2 - 1;
 128                 GLfloat *color1 = colors[face];
 129                 GLfloat *color2 = colors[face + 1];
 130
 131                 glBegin(GL_QUADS);
 132
 133                 glTexCoord3fv(cube_face_texcoords[face][0]);
 134                 glVertex2f(x1, y1);
 135
 136                 glTexCoord3fv(cube_face_texcoords[face][1]);
 137                 glVertex2f(x2, y1);
 138
 139                 glTexCoord3fv(cube_face_texcoords[face][2]);
 140                 glVertex2f(x2, y2);
 141
 142                 glTexCoord3fv(cube_face_texcoords[face][3]);
 143                 glVertex2f(x1, y2);
 144
 145                 glEnd();
 146
 147                 pass = pass && piglit_probe_pixel_rgb(tx1, ty1, color2);
 148                 pass = pass && piglit_probe_pixel_rgb(tx2, ty1, color1);
 149                 pass = pass && piglit_probe_pixel_rgb(tx1, ty2, color1);
 150                 pass = pass && piglit_probe_pixel_rgb(tx2, ty2, color1);
 151         }
 152
 153         glDeleteTextures(1, &tex);
 154
 155         piglit_present_results();
 156
 157         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 158 }
 159
 160 void piglit_init(int argc, char **argv)
 161 {
 162         GLint vs, fs;
 163         int loc;
 164         GLboolean bias = GL_FALSE;
 165         char *fs_name;
 166         int i = 0;
 167
 168         for (i = 0; i < argc; i++) {
 169                 if (!strcmp(argv[i], "-bias"))
 170                         bias = GL_TRUE;
 171         }
 172
 173         piglit_require_gl_version(20);
 174         piglit_require_extension("GL_ARB_texture_cube_map");
 175
 176         vs = piglit_compile_shader(GL_VERTEX_SHADER,
 177                                    "shaders/glsl-tex-mvp.vert");
 178         if (bias) {
 179                 fs_name = "shaders/glsl-fs-texturecube-bias.frag";
 180         } else {
 181                 fs_name = "shaders/glsl-fs-texturecube.frag";
 182         }
 183         fs = piglit_compile_shader(GL_FRAGMENT_SHADER, fs_name);
 184
 185         prog = piglit_link_simple_program(vs, fs);
 186         if (!piglit_link_check_status(prog))
 187                 piglit_report_result(PIGLIT_FAIL);
 188
 189         glUseProgram(prog);
 190
 191         loc = glGetUniformLocation(prog, "sampler");
 192         glUniform1i(loc, 0);
 193 }