tests/spec/arb_uniform_buffer_object/maxuniformblocksize.c

   1 /*
   2  * Copyright © 2012 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 maxblocks.c
  25  *
  26  * Tests linking and drawing with uniform buffer objects of size
  27  * MAX_UNIFORM_BLOCK_SIZE and MAX_UNIFORM_BLOCK_SIZE + 4.
  28  *
  29  * We test the max size + 4 because implementations are allowed to
  30  * link and draw beyond the exposed limits, but at that point there
  31  * are no guarantees it will link.  Those tests are the "vsexceed" and
  32  * "fsexceed" arguments.
  33  */
  34
  35 #include "piglit-util-gl.h"
  36
  37 PIGLIT_GL_TEST_CONFIG_BEGIN
  38
  39         config.supports_gl_compat_version = 10;
  40
  41         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  42         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  43
  44 PIGLIT_GL_TEST_CONFIG_END
  45
  46 static enum {
  47         VS,
  48         VS_EXCEED,
  49         FS,
  50         FS_EXCEED,
  51 } mode;
  52
  53 static void
  54 usage(const char *name)
  55 {
  56         fprintf(stderr, "usage: %s <vs | vsexceed | fs | fsexceed>\n",
  57                 name);
  58         piglit_report_result(PIGLIT_FAIL);
  59 }
  60
  61 enum piglit_result
  62 piglit_display(void)
  63 {
  64         const char *vs_ubo_template =
  65                 "#extension GL_ARB_uniform_buffer_object : enable\n"
  66                 "\n"
  67                 "varying vec4 vary;"
  68                 "\n"
  69                 "layout(std140) uniform ubo {\n"
  70                 "       vec4 v[%d];\n"
  71                 "};\n"
  72                 "uniform int i;\n"
  73                 "\n"
  74                 "void main() {\n"
  75                 "       gl_Position = gl_Vertex;\n"
  76                 "       vary = v[i];\n"
  77                 "}\n";
  78
  79         const char *fs_template =
  80                 "#extension GL_ARB_uniform_buffer_object : enable\n"
  81                 "\n"
  82                 "varying vec4 vary;"
  83                 "\n"
  84                 "void main() {\n"
  85                 "       gl_FragColor = vary;\n"
  86                 "}\n";
  87
  88         const char *vs_template =
  89                 "#extension GL_ARB_uniform_buffer_object : enable\n"
  90                 "\n"
  91                 "void main() {\n"
  92                 "       gl_Position = gl_Vertex;\n"
  93                 "}\n";
  94
  95         const char *fs_ubo_template =
  96                 "#extension GL_ARB_uniform_buffer_object : enable\n"
  97                 "\n"
  98                 "layout(std140) uniform ubo {\n"
  99                 "       vec4 v[%d];\n"
 100                 "};\n"
 101                 "uniform int i;\n"
 102                 "\n"
 103                 "void main() {\n"
 104                 "       gl_FragColor = v[i];\n"
 105                 "}\n";
 106
 107         GLint max_size, vec4s, i_location;
 108         GLuint vs, fs, prog, bo;
 109         GLenum target;
 110         float *data;
 111         size_t size;
 112         bool pass = true;
 113         bool may_link_fail;
 114         const float green[4] = { 0, 1, 0, 0 };
 115         int test_index;
 116
 117         piglit_require_extension("GL_ARB_uniform_buffer_object");
 118
 119         glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, &max_size);
 120         printf("Max uniform block size: %d\n", max_size);
 121         vec4s = max_size / 4 / 4;
 122
 123         switch (mode) {
 124         case VS:
 125                 target = GL_VERTEX_SHADER;
 126                 may_link_fail = false;
 127                 test_index = vec4s - 1;
 128                 break;
 129         case VS_EXCEED:
 130                 target = GL_VERTEX_SHADER;
 131                 may_link_fail = true;
 132                 vec4s++;
 133                 test_index = vec4s - 2;
 134                 break;
 135         case FS:
 136                 target = GL_FRAGMENT_SHADER;
 137                 may_link_fail = false;
 138                 test_index = vec4s - 1;
 139                 break;
 140         case FS_EXCEED:
 141                 target = GL_FRAGMENT_SHADER;
 142                 may_link_fail = true;
 143                 vec4s++;
 144                 test_index = vec4s - 2;
 145                 break;
 146         default:
 147                 assert(false);
 148                 target = GL_NONE;
 149                 may_link_fail = false;
 150         }
 151
 152         switch (target) {
 153         case GL_VERTEX_SHADER:
 154                 printf("Testing VS with uniform block vec4 v[%d]\n", vec4s);
 155                 vs = piglit_compile_shader_formatted(GL_VERTEX_SHADER,
 156                                                      vs_ubo_template, vec4s);
 157                 fs = piglit_compile_shader_formatted(GL_FRAGMENT_SHADER,
 158                                                      "%s", fs_template);
 159                 break;
 160         case GL_FRAGMENT_SHADER:
 161                 printf("Testing FS with uniform block vec4 v[%d]\n", vec4s);
 162                 vs = piglit_compile_shader_formatted(GL_VERTEX_SHADER,
 163                                                      "%s", vs_template);
 164                 fs = piglit_compile_shader_formatted(GL_FRAGMENT_SHADER,
 165                                                      fs_ubo_template, vec4s);
 166                 break;
 167         default:
 168                 piglit_report_result(PIGLIT_FAIL);
 169         }
 170
 171         prog = glCreateProgram();
 172         glAttachShader(prog, vs);
 173         glAttachShader(prog, fs);
 174         glLinkProgram(prog);
 175
 176         if (may_link_fail) {
 177                 if (!piglit_link_check_status_quiet(prog)) {
 178                         printf("Failed to link with uniform block vec4 "
 179                                "v[%d]\n", vec4s);
 180                         piglit_report_result(PIGLIT_PASS);
 181                 }
 182         } else {
 183                 if (!piglit_link_check_status_quiet(prog)) {
 184                         fprintf(stderr,
 185                                 "Failed to link with uniform block vec4 "
 186                                 "v[%d]\n", vec4s);
 187                         return PIGLIT_FAIL;
 188                 }
 189         }
 190
 191         size = vec4s * 4 * sizeof(float);
 192         glGenBuffers(1, &bo);
 193         glBindBuffer(GL_UNIFORM_BUFFER, bo);
 194         glBufferData(GL_UNIFORM_BUFFER, size, NULL, GL_DYNAMIC_DRAW);
 195         data = glMapBuffer(GL_UNIFORM_BUFFER, GL_READ_WRITE);
 196         memset(data, 0, size);
 197
 198         /* The whole uniform buffer will be zeros, except for the
 199          * entry at v[test_index] which will be green.
 200          */
 201         data[test_index * 4 + 0] = green[0];
 202         data[test_index * 4 + 1] = green[1];
 203         data[test_index * 4 + 2] = green[2];
 204         data[test_index * 4 + 3] = green[3];
 205         glUnmapBuffer(GL_UNIFORM_BUFFER);
 206
 207         glUseProgram(prog);
 208         i_location = glGetUniformLocation(prog, "i");
 209         glUniform1i(i_location, test_index);
 210
 211         glUniformBlockBinding(prog, 0, 0);
 212         glBindBufferBase(GL_UNIFORM_BUFFER, 0, bo);
 213         piglit_draw_rect(-1, -1, 2, 2);
 214
 215         pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
 216
 217         glDeleteProgram(prog);
 218
 219         piglit_present_results();
 220
 221         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 222 }
 223
 224
 225 void
 226 piglit_init(int argc, char **argv)
 227 {
 228         if (argc < 2)
 229                 usage(argv[0]);
 230
 231         if (strcmp(argv[1], "vs") == 0)
 232                 mode = VS;
 233         else if (strcmp(argv[1], "vsexceed") == 0)
 234                 mode = VS_EXCEED;
 235         else if (strcmp(argv[1], "fs") == 0)
 236                 mode = FS;
 237         else if (strcmp(argv[1], "fsexceed") == 0)
 238                 mode = FS_EXCEED;
 239         else
 240                 usage(argv[0]);
 241 }