tests/spec/arb_shader_storage_buffer_object/array-ssbo-binding.c

   1 /*
   2  * Copyright © 2015 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"),
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   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
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  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /** @file array-ssbo-binding.c
  25  *
  26  * Tests that modifying the binding point of an array of shader
  27  * storage block works correctly, i.e., former attached buffer is not
  28  * modified and the other is.
  29  */
  30
  31 #include "piglit-util-gl.h"
  32
  33 PIGLIT_GL_TEST_CONFIG_BEGIN
  34         config.window_width = 100;
  35         config.window_height = 100;
  36         config.supports_gl_compat_version = 32;
  37         config.supports_gl_core_version = 32;
  38         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  39         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  40
  41 PIGLIT_GL_TEST_CONFIG_END
  42
  43 #define SSBO_SIZE 4
  44
  45 static const char vs_pass_thru_text[] =
  46         "#version 330\n"
  47         "#extension GL_ARB_shader_storage_buffer_object : require\n"
  48         "\n"
  49         "layout(std140, binding=2) buffer ssbo {\n"
  50         "       vec4 v;\n"
  51         "} a[2];\n"
  52         "\n"
  53         "in vec4 piglit_vertex;\n"
  54         "\n"
  55         "void main() {\n"
  56         "       gl_Position = piglit_vertex;\n"
  57         "       a[0].v = a[0].v + 1.0;\n"
  58         "       a[1].v = a[1].v + 10.0;\n"
  59         "}\n";
  60
  61 static const char fs_source[] =
  62         "#version 330\n"
  63         "#extension GL_ARB_shader_storage_buffer_object : require\n"
  64         "\n"
  65         "out vec4 color;\n"
  66         "\n"
  67         "layout(std140, binding=2) buffer ssbo {\n"
  68         "       vec4 v;\n"
  69         "} a[2];\n"
  70         "\n"
  71         "void main() {\n"
  72         "       color = a[0].v;\n"
  73         "}\n";
  74
  75 GLuint prog;
  76
  77 void
  78 piglit_init(int argc, char **argv)
  79 {
  80         bool pass = true;
  81         GLuint buffer[2];
  82         unsigned int i;
  83         float ssbo_values[SSBO_SIZE] = {0};
  84         float *map;
  85         int index;
  86         GLint num_vertex_ssbo;
  87
  88         piglit_require_extension("GL_ARB_shader_storage_buffer_object");
  89         piglit_require_extension("GL_ARB_program_interface_query");
  90
  91         glGetIntegerv(GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS, &num_vertex_ssbo);
  92         if (num_vertex_ssbo < 1)
  93                 piglit_report_result(PIGLIT_SKIP);
  94
  95         prog = piglit_build_simple_program(vs_pass_thru_text, fs_source);
  96
  97         glUseProgram(prog);
  98
  99         glClearColor(0, 0, 0, 0);
 100
 101         glGenBuffers(2, buffer);
 102         glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, buffer[0]);
 103         glBufferData(GL_SHADER_STORAGE_BUFFER, SSBO_SIZE*sizeof(GLfloat),
 104                                 &ssbo_values[0], GL_DYNAMIC_DRAW);
 105         /* Change binding point */
 106         index = glGetProgramResourceIndex(prog,
 107                                           GL_SHADER_STORAGE_BLOCK, "ssbo[0]");
 108         glShaderStorageBlockBinding(prog, index, 4);
 109
 110         glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 4, buffer[1]);
 111         glBufferData(GL_SHADER_STORAGE_BUFFER, SSBO_SIZE*sizeof(GLfloat),
 112                                 &ssbo_values[0], GL_DYNAMIC_DRAW);
 113
 114         glViewport(0, 0, piglit_width, piglit_height);
 115
 116         piglit_draw_rect(-1, -1, 2, 2);
 117
 118         glBindBuffer(GL_SHADER_STORAGE_BUFFER, buffer[0]);
 119         map = (float *) glMapBuffer(GL_SHADER_STORAGE_BUFFER,  GL_READ_ONLY);
 120
 121         /* Former bound buffer should not be modified */
 122         for (i = 0; i < SSBO_SIZE; i++) {
 123                 if (map[i] != 0) {
 124                         printf("Wrong %d value in buffer[0]: %.2f\n",
 125                                i, map[i]);
 126                         pass = false;
 127                 }
 128         }
 129         glUnmapBuffer(GL_SHADER_STORAGE_BUFFER);
 130
 131         glBindBuffer(GL_SHADER_STORAGE_BUFFER, buffer[1]);
 132         map = (float *) glMapBuffer(GL_SHADER_STORAGE_BUFFER,  GL_READ_ONLY);
 133
 134         for (i = 0; i < SSBO_SIZE; i++) {
 135                 /* Values should be below ten but different than zero */
 136                 if (map[i] == 0 || map[i] > 10) {
 137                         printf("Wrong %d value in buffer[1]: %.2f\n",
 138                                i, map[i]);
 139                         pass = false;
 140                 }
 141         }
 142
 143         glUnmapBuffer(GL_SHADER_STORAGE_BUFFER);
 144
 145         if (!piglit_check_gl_error(GL_NO_ERROR))
 146            pass = false;
 147
 148         piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
 149 }
 150
 151 enum piglit_result piglit_display(void)
 152 {
 153         /* UNREACHED */
 154         return PIGLIT_FAIL;
 155 }