tests/spec/arb_seamless_cube_map/three-faces-average.c

   1 /*
   2  * Copyright © 2013 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 shall be included
  12  * in all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  */
  21
  22 /*
  23  * Test verifies that when sampling from three adjoining faces in a cube map,
  24  * samples will be averaged. If they share the same value, that value must be
  25  * guaranteed to be the result of the average. Resulting color should not
  26  * include border color contamination.
  27  */
  28
  29 /*
  30  * ARB_seamless_cube_map Section 3.8.7 says:
  31  *     "If LINEAR filtering is done within a miplevel, always apply wrap mode
  32  *     CLAMP_TO_BORDER. Then, ...
  33  *
  34  *     If a texture sample location would lie in the texture border in
  35  *     both u and v (in one of the corners of the cube), there is no
  36  *     unique neighboring face from which to extract one texel. The
  37  *     recommended method is to average the values of the three
  38  *     available samples. However, implementations are free to
  39  *     construct this fourth texel in another way, so long as, when the
  40  *     three available samples have the same value, this texel also has
  41  *     that value."
  42  */
  43
  44 #include "piglit-util-gl.h"
  45
  46 PIGLIT_GL_TEST_CONFIG_BEGIN
  47
  48         config.supports_gl_compat_version = 10;
  49         config.supports_gl_core_version = 31;
  50
  51         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  52
  53 PIGLIT_GL_TEST_CONFIG_END
  54
  55 const char *vs_text =
  56 {
  57         "#version 130\n"
  58         "\n"
  59         "in vec2 vertex;\n"
  60         "\n"
  61         "void main() {\n"
  62         "       gl_Position = vec4(vertex.xy, 0, 1);\n"
  63         "}\n"
  64 };
  65
  66 const char *fs_text =
  67 {
  68         "#version 130\n"
  69         "\n"
  70         "uniform samplerCube cubeTex;\n"
  71         "uniform vec3 cubeVec;\n"
  72         "\n"
  73         "void main() {\n"
  74         "       gl_FragColor = texture(cubeTex, cubeVec);\n"
  75         "}\n"
  76 };
  77
  78 static const float red[3] = { 1., 0., 0. };
  79 static const float blue[3] = { 0., 0., 1. };
  80 static const float green[3] = { 0., 1.0, 0. };
  81
  82 static GLuint prog;
  83 static GLuint vao;
  84 static GLuint vbo;
  85 static GLuint cubeMap;
  86
  87 static GLint cubeVec_loc;
  88 static GLfloat cubeVecPositive[3] = { 0.5, 0.5, 0.5 };
  89 static GLfloat cubeVecNegative[3] = { -0.5, -0.5, -0.5 };
  90
  91 static const GLenum targets[6] = {
  92    GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB,
  93    GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB,
  94    GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB,
  95    GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB,
  96    GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB,
  97    GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB
  98 };
  99
 100 static GLfloat quad_01[4][2] =
 101 {
 102         { -1., -1. },
 103         { -1.,  0. },
 104         {  0.,  0. },
 105         {  0., -1. }
 106 };
 107
 108 static GLfloat quad_02[4][2] =
 109 {
 110         { 0., 0. },
 111         { 0., 1. },
 112         { 1., 1. },
 113         { 1., 0. }
 114 };
 115
 116 void piglit_init( int argc, char **argv)
 117 {
 118         GLint i;
 119         GLuint vertex_index;
 120
 121         if(piglit_get_gl_version() < 32) {
 122                 piglit_require_extension("GL_ARB_seamless_cube_map");
 123                 piglit_require_GLSL_version(130);
 124         }
 125
 126         /* create program */
 127         prog = piglit_build_simple_program(vs_text, fs_text);
 128         glUseProgram(prog);
 129
 130         /* create buffers */
 131         glGenBuffers(1, &vbo);
 132         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 133         glBufferData(GL_ARRAY_BUFFER, sizeof(quad_01) + sizeof(quad_02),
 134                       NULL, GL_STATIC_DRAW);
 135         glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(quad_01),
 136                          &quad_01);
 137         glBufferSubData(GL_ARRAY_BUFFER, sizeof(quad_01), sizeof(quad_02),
 138                          &quad_02);
 139
 140         glGenVertexArrays(1, &vao);
 141         glBindVertexArray(vao);
 142
 143         vertex_index = glGetAttribLocation(prog, "vertex");
 144
 145         /* vertex attribs */
 146         glEnableVertexAttribArray(vertex_index);
 147
 148         glVertexAttribPointer(vertex_index, 2, GL_FLOAT, GL_FALSE, 0, 0);
 149
 150         glGenTextures(1, &cubeMap);
 151         glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, cubeMap);
 152
 153         /* set filter to linear, hardware should behave as if wrap modes are
 154          * set to CLAMP_TO_BORDER
 155          */
 156         glTexParameterfv(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_BORDER_COLOR,
 157                           green);
 158         glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MIN_FILTER,
 159                          GL_LINEAR);
 160         glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER,
 161                          GL_LINEAR);
 162
 163         /* texture positive axes/faces red */
 164         for(i = 0; i < 3; i++) {
 165                 glTexImage2D(targets[i], 0, GL_RGBA8, 1, 1, 0, GL_RGB,
 166                              GL_FLOAT, red);
 167         }
 168
 169         /* texuture negative axes/faces blue */
 170         for(i = 3; i < 6; i++) {
 171                 glTexImage2D(targets[i], 0, GL_RGBA8, 1, 1, 0, GL_RGB,
 172                              GL_FLOAT, blue);
 173         }
 174
 175         /* uniform texcoord input */
 176         cubeVec_loc = glGetUniformLocation(prog, "cubeVec");
 177
 178         if(!piglit_check_gl_error(GL_NO_ERROR))
 179                piglit_report_result(PIGLIT_FAIL);
 180
 181 }
 182
 183 enum piglit_result piglit_display(void)
 184 {
 185         bool pass = true;
 186         int w = piglit_width / 2;
 187         int h = piglit_height / 2;
 188
 189         glViewport(0, 0, piglit_width, piglit_height);
 190
 191         glClear(GL_COLOR_BUFFER_BIT);
 192
 193         glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
 194
 195         /* texcoords should target vector to upper corner */
 196         glUniform3fv(cubeVec_loc, 1, cubeVecPositive);
 197         glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 198
 199         /* expect red */
 200         pass = piglit_probe_rect_rgb(0, 0, w, h, red) && pass;
 201
 202         /* texcoords should target vector to bottom corner */
 203         glUniform3fv(cubeVec_loc, 1, cubeVecNegative);
 204         glDrawArrays(GL_TRIANGLE_FAN, 4, 4);
 205
 206         /* expect blue */
 207         pass = piglit_probe_rect_rgb(w, h, w, h, blue) && pass;
 208
 209         piglit_present_results();
 210
 211         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 212 }