tests/spec/arb_texture_view/sampling-2d-array-as-cubemap.c

   1 /*
   2  * Copyright © 2014 Ilia Mirkin
   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  * Author: Ilia Mirkin <imirkin@alum.mit.edu>
  24  */
  25
  26 /**
  27  * \file sampling-2d-array-as-cubemap.c
  28  * This tests that you can cast from a 2D Array texture to a Cubemap
  29  * texture and sample from the Cubemap view.
  30  */
  31
  32 #include "piglit-util-gl.h"
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35
  36         config.supports_gl_compat_version = 30;
  37         config.supports_gl_es_version = 31;
  38         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  39         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  40
  41 PIGLIT_GL_TEST_CONFIG_END
  42
  43 static const GLubyte green[] = {0, 255, 0, 255};
  44 static const float greenf[] = {0, 1.0f, 0, 1.0f};
  45 static const GLubyte red[] = {255, 0, 0, 255};
  46
  47 enum piglit_result
  48 piglit_display(void)
  49 {
  50         GLboolean pass;
  51
  52         glViewport(0, 0, piglit_width, piglit_height);
  53         glClearColor(0.5, 0.5, 0.5, 0.5);
  54         glClear(GL_COLOR_BUFFER_BIT);
  55
  56         piglit_draw_rect(-1, -1, 2, 2);
  57
  58         pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, greenf);
  59
  60         piglit_present_results();
  61
  62         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  63 }
  64
  65 #ifdef PIGLIT_USE_OPENGL
  66 #define GLSL_VERSION "130"
  67 #else
  68 #define GLSL_VERSION "310 es"
  69 #endif
  70
  71 static const char *vs =
  72         "#version " GLSL_VERSION "\n"
  73         "in vec4 piglit_vertex;\n"
  74         "void main() { \n"
  75         "       gl_Position = piglit_vertex;\n"
  76         "}\n";
  77
  78 static const char *fs =
  79         "#version " GLSL_VERSION "\n"
  80         "#ifdef GL_ES\n"
  81         "precision highp float;\n"
  82         "precision highp samplerCube;\n"
  83         "#endif\n"
  84         "uniform samplerCube tex;\n"
  85         "out vec4 color;\n"
  86         "void main() { \n"
  87         "       color = vec4(texture(tex, vec3(-1, 0, 0)).xyz, 1.0);\n"
  88         "}\n";
  89
  90 void
  91 piglit_init(int argc, char **argv)
  92 {
  93         int tex_loc_cube, prog_cube, l;
  94         GLuint tex_2DArray, tex_Cube;
  95
  96 #ifdef PIGLIT_USE_OPENGL
  97         piglit_require_extension("GL_ARB_texture_view");
  98 #else
  99         piglit_require_extension("GL_OES_texture_view");
 100 #endif
 101
 102         /* setup shaders and program object for Cube rendering */
 103         prog_cube = piglit_build_simple_program(vs, fs);
 104         tex_loc_cube = glGetUniformLocation(prog_cube, "tex");
 105
 106         glGenTextures(1, &tex_2DArray);
 107         glBindTexture(GL_TEXTURE_2D_ARRAY, tex_2DArray);
 108
 109         glTexStorage3D(GL_TEXTURE_2D_ARRAY, 1, GL_RGBA8, 1, 1, 8);
 110
 111         /* load each array layer with red */
 112         for (l = 0; l < 8; l++) {
 113                 glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, l,
 114                                 1, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, red);
 115         }
 116         /* make array layer 3 have green */
 117         glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, 3,
 118                         1, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, green);
 119
 120         glGenTextures(1, &tex_Cube);
 121         /* the texture view starts at layer 2, so face 1 (-X) will have green */
 122         glTextureView(tex_Cube, GL_TEXTURE_CUBE_MAP, tex_2DArray, GL_RGBA8,
 123                       0, 1, 2, 6);
 124         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 125         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 126
 127         glBindTexture(GL_TEXTURE_CUBE_MAP, tex_Cube);
 128
 129         glUseProgram(prog_cube);
 130         glUniform1i(tex_loc_cube, 0);
 131 }