tests/spec/arb_texture_buffer_object/indexed.c

   1 /* Copyright © 2015 Ilia Mirkin
   2  * Copyright © 2017 VMware, Inc.
   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
  24 /** @file indexed.c
  25  *
  26  * Tests that we can sample texture buffers with sampler indexing.
  27  */
  28
  29 #include "piglit-util-gl.h"
  30
  31 PIGLIT_GL_TEST_CONFIG_BEGIN
  32         config.supports_gl_core_version = 32;
  33         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  34         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  35 PIGLIT_GL_TEST_CONFIG_END
  36
  37 enum piglit_result
  38 piglit_display(void)
  39 {
  40         static const float green[4] = {0, 1, 0, 0};
  41         bool pass;
  42
  43         glViewport(0, 0, piglit_width, piglit_height);
  44         glClearColor(0.2, 0.2, 0.2, 0.2);
  45         glClear(GL_COLOR_BUFFER_BIT);
  46
  47         piglit_draw_rect(-1, -1, 2, 2);
  48
  49         pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
  50
  51         piglit_present_results();
  52
  53         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  54 }
  55
  56 void
  57 piglit_init(int argc, char **argv)
  58 {
  59         static const char *vs_source =
  60                 "#version 150\n"
  61                 "in vec4 piglit_vertex;\n"
  62                 "void main()\n"
  63                 "{\n"
  64                 "       gl_Position = piglit_vertex;\n"
  65                 "}\n";
  66
  67         static const char *fs_source =
  68                 "#version 150\n"
  69                 "#extension GL_ARB_gpu_shader5: require\n"
  70                 "uniform samplerBuffer s[2];\n"
  71                 "uniform int offset;\n"
  72                 "uniform int index = 1;\n"
  73                 "void main()\n"
  74                 "{\n"
  75                 "       gl_FragColor = texelFetch(s[index], offset);\n"
  76                 "}\n";
  77
  78         GLuint tex[2], tbo[2];
  79         GLint indices[2] = { 0, 1 };
  80         static const uint8_t datag[4] = {0x00, 0xff, 0x00, 0x00};
  81         static const uint8_t datar[4] = {0xff, 0x00, 0x00, 0x00};
  82         GLuint prog;
  83         GLint size = 4;
  84         piglit_require_extension("GL_ARB_gpu_shader5");
  85
  86         prog = piglit_build_simple_program(vs_source, fs_source);
  87         glUseProgram(prog);
  88
  89         glGenBuffers(2, tbo);
  90         glGenTextures(2, tex);
  91         glBindBuffer(GL_TEXTURE_BUFFER, tbo[0]);
  92         glBindTexture(GL_TEXTURE_BUFFER, tex[0]);
  93         glTexBuffer(GL_TEXTURE_BUFFER, GL_RGBA8, tbo[0]);
  94         glBufferData(GL_TEXTURE_BUFFER,
  95                      size * sizeof(datar), NULL, GL_STATIC_READ);
  96         glBufferSubData(GL_TEXTURE_BUFFER,
  97                         (size - 1) * sizeof(datar), sizeof(datar), datar);
  98
  99         glActiveTexture(GL_TEXTURE1);
 100         glBindBuffer(GL_TEXTURE_BUFFER, tbo[1]);
 101         glBindTexture(GL_TEXTURE_BUFFER, tex[1]);
 102         glTexBuffer(GL_TEXTURE_BUFFER, GL_RGBA8, tbo[1]);
 103         glBufferData(GL_TEXTURE_BUFFER,
 104                      size * sizeof(datag), NULL, GL_STATIC_READ);
 105         glBufferSubData(GL_TEXTURE_BUFFER,
 106                         (size - 1) * sizeof(datag), sizeof(datag), datag);
 107
 108         glUniform1i(glGetUniformLocation(prog, "offset"), size - 1);
 109         glUniform1iv(glGetUniformLocation(prog, "s"), 2, indices);
 110 }