tests/spec/arb_uniform_buffer_object/rendering-array.c

   1 /*
   2  * Copyright (c) 2016 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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /** @file rendering-array.c
  25  *
  26  * Test rendering with a UBO containing an array of structs.
  27  * We draw four squares with different positions, sizes, rotations and colors
  28  * where those parameters come from an array in a UBO.  Each draw command
  29  * indexes into a different element of that array.
  30  */
  31
  32 #include "piglit-util-gl.h"
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35         config.supports_gl_compat_version = 20;
  36         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  37         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  38 PIGLIT_GL_TEST_CONFIG_END
  39
  40
  41 static const char vert_shader_text[] =
  42         "#extension GL_ARB_uniform_buffer_object : require\n"
  43         "\n"
  44         "layout(std140) uniform;\n"
  45         "uniform ub_info { \n"
  46         "   struct { \n"
  47         "      vec2 pos; \n"
  48         "      float size; \n"
  49         "      float rotation; \n"
  50         "      vec4 color; \n"
  51         "   } info [4];\n"
  52         "};\n"
  53         "\n"
  54         "uniform int j; \n"
  55         "varying vec4 color; \n"
  56         "\n"
  57         "void main()\n"
  58         "{\n"
  59         "   int i; \n"
  60         "   mat2 m;\n"
  61         "   for (i = 0; i < 4; i++) { \n"
  62         "      if (i == j) { \n"
  63         "         m[0][0] = m[1][1] = cos(info[i].rotation); \n"
  64         "         m[0][1] = sin(info[i].rotation); \n"
  65         "         m[1][0] = -m[0][1]; \n"
  66         "         gl_Position.xy = m * gl_Vertex.xy * vec2(info[i].size) + info[i].pos;\n"
  67         "         gl_Position.zw = vec2(0, 1);\n"
  68         "         color = info[i].color; \n"
  69         "      } \n"
  70         "   } \n"
  71         "}\n";
  72
  73 static const char frag_shader_text[] =
  74         "#extension GL_ARB_uniform_buffer_object : require\n"
  75         "\n"
  76         "varying vec4 color; \n"
  77         "\n"
  78         "layout(std140) uniform;\n"
  79         "\n"
  80         "void main()\n"
  81         "{\n"
  82         "   gl_FragColor = color;\n"
  83         "}\n";
  84
  85 #define NUM_SQUARES 4
  86
  87 static GLuint prog;
  88 static GLuint ubo_buffer;
  89 static GLint alignment;
  90 static bool test_buffer_offset = false;
  91 static int uniform_j;
  92
  93 struct object_info {
  94         float pos[2];
  95         float size, rotation;
  96         float color[4];
  97 };
  98
  99 /* This data are copied into the UBO */
 100 static const struct object_info obj_info[NUM_SQUARES] = {
 101         { {-0.5, -0.5}, 0.1, 0.0, {1.0, 0.0, 0.0, 1.0} },
 102         { { 0.5, -0.5}, 0.2, 0.1, {0.0, 1.0, 0.0, 1.0} },
 103         { {-0.5,  0.5}, 0.3, 0.2, {0.0, 0.0, 1.0, 1.0} },
 104         { { 0.5,  0.5}, 0.4, 0.3, {1.0, 1.0, 1.0, 1.0} }
 105 };
 106
 107
 108 static void
 109 setup_ubos(void)
 110 {
 111         static const char *ubo_name = "ub_info";
 112         GLint ubo_index, ubo_size;
 113
 114         glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &alignment);
 115         printf("GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT = %d\n", alignment);
 116
 117         if (test_buffer_offset) {
 118                 printf("Testing buffer offset %d\n", alignment);
 119         }
 120         else {
 121                 /* we use alignment as the offset */
 122                 alignment = 0;
 123         }
 124
 125         glGenBuffers(1, &ubo_buffer);
 126
 127         /* query UBO index */
 128         ubo_index = glGetUniformBlockIndex(prog, ubo_name);
 129
 130         /* query UBO size */
 131         glGetActiveUniformBlockiv(prog, ubo_index,
 132                                   GL_UNIFORM_BLOCK_DATA_SIZE, &ubo_size);
 133
 134         printf("UBO %s: index = %d, size = %d\n",
 135                ubo_name, ubo_index, ubo_size);
 136
 137         assert(ubo_size == sizeof(obj_info));
 138
 139         /* Allocate UBO and put object info into it */
 140         glBindBuffer(GL_UNIFORM_BUFFER, ubo_buffer);
 141         glBufferData(GL_UNIFORM_BUFFER, alignment + sizeof(obj_info),
 142                      NULL, GL_STATIC_DRAW);
 143         glBufferSubData(GL_UNIFORM_BUFFER, alignment,
 144                         sizeof(obj_info), obj_info);
 145
 146         /* Attach UBO */
 147         glBindBufferRange(GL_UNIFORM_BUFFER, 0, ubo_buffer,
 148                           alignment,  /* offset */
 149                           ubo_size);
 150         glUniformBlockBinding(prog, ubo_index, 0);
 151
 152         if (!piglit_check_gl_error(GL_NO_ERROR))
 153                 piglit_report_result(PIGLIT_FAIL);
 154 }
 155
 156
 157 void
 158 piglit_init(int argc, char **argv)
 159 {
 160         piglit_require_extension("GL_ARB_uniform_buffer_object");
 161
 162         if (argc > 1 && strcmp(argv[1], "offset") == 0) {
 163                 test_buffer_offset = true;
 164         }
 165
 166         prog = piglit_build_simple_program(vert_shader_text, frag_shader_text);
 167         assert(prog);
 168         glUseProgram(prog);
 169
 170         uniform_j = glGetUniformLocation(prog, "j");
 171
 172         setup_ubos();
 173
 174         glClearColor(0.2, 0.2, 0.2, 0.2);
 175 }
 176
 177
 178 enum piglit_result
 179 piglit_display(void)
 180 {
 181         bool pass = true;
 182         int x0 = piglit_width / 4;
 183         int x1 = piglit_width * 3 / 4;
 184         int y0 = piglit_height / 4;
 185         int y1 = piglit_height * 3 / 4;
 186         int i;
 187
 188         glViewport(0, 0, piglit_width, piglit_height);
 189
 190         glClear(GL_COLOR_BUFFER_BIT);
 191
 192         for (i = 0; i < NUM_SQUARES; i++) {
 193                 /* Take object parameters from array position [i] */
 194                 glUniform1i(uniform_j, i);
 195
 196                 if (!piglit_check_gl_error(GL_NO_ERROR))
 197                         return PIGLIT_FAIL;
 198
 199                 piglit_draw_rect(-1, -1, 2, 2);
 200         }
 201
 202         pass = piglit_probe_pixel_rgba(x0, y0, obj_info[0].color) && pass;
 203         pass = piglit_probe_pixel_rgba(x1, y0, obj_info[1].color) && pass;
 204         pass = piglit_probe_pixel_rgba(x0, y1, obj_info[2].color) && pass;
 205         pass = piglit_probe_pixel_rgba(x1, y1, obj_info[3].color) && pass;
 206
 207         piglit_present_results();
 208
 209         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 210 }