tests/spec/arb_shader_storage_buffer_object/layout-std140-write-shader.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"),
   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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /** @file layout-std140-write-shader.c
  25  *
  26  * Tests that shader storage block writes in GLSL works correctly (offsets and
  27  * values) when interface packing qualifier is std140 and row_major.
  28  */
  29
  30 #include "piglit-util-gl.h"
  31
  32 PIGLIT_GL_TEST_CONFIG_BEGIN
  33         config.window_width = 100;
  34         config.window_height = 100;
  35         config.supports_gl_compat_version = 32;
  36         config.supports_gl_core_version = 32;
  37         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  38         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  39
  40 PIGLIT_GL_TEST_CONFIG_END
  41
  42 #define SSBO_SIZE 44
  43
  44 static const char vs_pass_thru_text[] =
  45         "#version 130\n"
  46         "#extension GL_ARB_shader_storage_buffer_object : require\n"
  47         "#extension GL_ARB_uniform_buffer_object : require\n"
  48         "\n"
  49         "struct A {\n"
  50         "       float a1;\n"
  51         "       vec2 a2[2];\n"
  52         "       mat2 a4;\n"
  53         "};\n"
  54         "layout(std140, row_major, binding=2) buffer ssbo {\n"
  55         "       vec4 v;\n"
  56         "       float f;\n"
  57         "       A s;\n"
  58         "       float unsized_array[];\n"
  59         "};\n"
  60         "in vec4 piglit_vertex;\n"
  61         "void main() {\n"
  62         "       gl_Position = piglit_vertex;\n"
  63         "       f = 4.0;\n"
  64         "       s.a2[0] = vec2(6.0, 7.0); \n"
  65         "       int index = int(v.x); // index should be zero\n"
  66         "       if ((index + gl_VertexID) < 4)\n"
  67         "              unsized_array[index + gl_VertexID] = unsized_array.length();\n"
  68         "}\n";
  69
  70 static const char fs_source[] =
  71         "#version 130\n"
  72         "#extension GL_ARB_shader_storage_buffer_object : require\n"
  73         "#extension GL_ARB_uniform_buffer_object : require\n"
  74         "\n"
  75         "struct A {\n"
  76         "       float a1;\n"
  77         "       vec2 a2[2];\n"
  78         "       mat2 a4;\n"
  79         "};\n"
  80         "layout(std140, row_major, binding=2) buffer ssbo {\n"
  81         "       vec4 v;\n"
  82         "       float f;\n"
  83         "       A s;\n"
  84         "       float unsized_array[];\n"
  85         "};\n"
  86         "out vec4 color;\n"
  87         "\n"
  88         "void main() {\n"
  89         "       color = vec4(0,1,0,1);\n"
  90         "       v = vec4(0.0, 1.0, 2.0, 3.0);\n"
  91         "       s.a1 = 5.0;\n"
  92         "       s.a2[1] = vec2(8.0, 9.0);\n"
  93         "       s.a4 = mat2(10.0, 11.0, 12.0, 13.0);\n"
  94         "       int index = int(v.z + gl_FragCoord.x);\n"
  95         "       if (index >= 0 && index < 4)\n"
  96         "              unsized_array[index] = unsized_array.length() * 2.0;\n"
  97         "}\n";
  98
  99 GLuint prog;
 100
 101 float expected[SSBO_SIZE] = { 0.0,  1.0,  2.0,  3.0, // vec4 v
 102                               4.0,  0.0,  0.0,  0.0, // float f
 103                               5.0,  0.0,  0.0,  0.0, // float s.a1
 104                               6.0,  7.0,  0.0,  0.0, // vec2 s.a2[0]
 105                               8.0,  9.0,  0.0,  0.0, // vec2 s.a2[1]
 106                              10.0, 12.0,  0.0,  0.0, // mat2 a4
 107                              11.0, 13.0,  0.0,  0.0, // mat2 a4
 108                               4.0,  0.0,  0.0,  0.0, // float unsized_array[0]
 109                               4.0,  0.0,  0.0,  0.0, // float unsized_array[1]
 110                               8.0,  0.0,  0.0,  0.0, // float unsized_array[2]
 111                               8.0,  0.0,  0.0,  0.0, // float unsized_array[3]
 112 };
 113
 114 void
 115 piglit_init(int argc, char **argv)
 116 {
 117         bool pass = true;
 118         GLuint buffer;
 119         unsigned int i;
 120         float ssbo_values[SSBO_SIZE] = {0};
 121         float *map;
 122         GLint num_vertex_ssbo;
 123
 124         piglit_require_extension("GL_ARB_shader_storage_buffer_object");
 125
 126         glGetIntegerv(GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS, &num_vertex_ssbo);
 127         if (num_vertex_ssbo < 1)
 128                 piglit_report_result(PIGLIT_SKIP);
 129         prog = piglit_build_simple_program(vs_pass_thru_text, fs_source);
 130
 131         glUseProgram(prog);
 132
 133         glClearColor(0, 0, 0, 0);
 134
 135         glGenBuffers(1, &buffer);
 136         glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, buffer);
 137         glBufferData(GL_SHADER_STORAGE_BUFFER, SSBO_SIZE*sizeof(GLfloat),
 138                                 &ssbo_values[0], GL_DYNAMIC_DRAW);
 139
 140         glViewport(0, 0, piglit_width, piglit_height);
 141
 142         piglit_draw_rect(-1, -1, 2, 2);
 143
 144         glBindBuffer(GL_SHADER_STORAGE_BUFFER, buffer);
 145         map = (float *) glMapBuffer(GL_SHADER_STORAGE_BUFFER,  GL_READ_ONLY);
 146
 147         for (i = 0; i < SSBO_SIZE; i++) {
 148                 if (map[i] != expected[i]) {
 149                         printf("expected[%d] = %.2f. Read value: %.2f\n",
 150                                i, expected[i], map[i]);
 151                         pass = false;
 152                 }
 153         }
 154
 155         glUnmapBuffer(GL_SHADER_STORAGE_BUFFER);
 156
 157         if (!piglit_check_gl_error(GL_NO_ERROR))
 158            pass = false;
 159
 160         piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
 161 }
 162
 163 enum piglit_result piglit_display(void)
 164 {
 165         /* UNREACHED */
 166         return PIGLIT_FAIL;
 167 }