tests/spec/arb_uniform_buffer_object/rendering.c

   1 /*
   2  * Copyright (c) 2014 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.c
  25  *
  26  * Test rendering with UBOs.  We draw four squares with different positions,
  27  * sizes, rotations and colors where those parameters come from UBOs.
  28  */
  29
  30 #include "piglit-util-gl.h"
  31
  32 PIGLIT_GL_TEST_CONFIG_BEGIN
  33
  34         config.supports_gl_compat_version = 20;
  35         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  36         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  37
  38 PIGLIT_GL_TEST_CONFIG_END
  39
  40 static const char vert_shader_text[] =
  41         "#extension GL_ARB_uniform_buffer_object : require\n"
  42         "\n"
  43         "layout(std140) uniform;\n"
  44         "uniform ub_pos_size { vec2 pos; float size; };\n"
  45         "uniform ub_rot {float rotation; };\n"
  46         "\n"
  47         "void main()\n"
  48         "{\n"
  49         "   mat2 m;\n"
  50         "   m[0][0] = m[1][1] = cos(rotation); \n"
  51         "   m[0][1] = sin(rotation); \n"
  52         "   m[1][0] = -m[0][1]; \n"
  53         "   gl_Position.xy = m * gl_Vertex.xy * vec2(size) + pos;\n"
  54         "   gl_Position.zw = vec2(0, 1);\n"
  55         "}\n";
  56
  57 static const char frag_shader_text[] =
  58         "#extension GL_ARB_uniform_buffer_object : require\n"
  59         "\n"
  60         "layout(std140) uniform;\n"
  61         "uniform ub_color { vec4 color; float color_scale; };\n"
  62         "\n"
  63         "void main()\n"
  64         "{\n"
  65         "   gl_FragColor = color * color_scale;\n"
  66         "}\n";
  67
  68 #define NUM_SQUARES 4
  69 #define NUM_UBOS 3
  70
  71 /* Square positions and sizes */
  72 static const float pos_size[NUM_SQUARES][3] = {
  73         { -0.5, -0.5, 0.1 },
  74         {  0.5, -0.5, 0.2 },
  75         { -0.5, 0.5, 0.3 },
  76         {  0.5, 0.5, 0.4 }
  77 };
  78
  79 /* Square color and color_scales */
  80 static const float color[NUM_SQUARES][8] = {
  81         { 2.0, 0.0, 0.0, 1.0,   0.50, 0.0, 0.0, 0.0 },
  82         { 0.0, 4.0, 0.0, 1.0,   0.25, 0.0, 0.0, 0.0 },
  83         { 0.0, 0.0, 5.0, 1.0,   0.20, 0.0, 0.0, 0.0 },
  84         { 0.2, 0.2, 0.2, 0.2,   5.00, 0.0, 0.0, 0.0 }
  85 };
  86
  87 /* Square rotations */
  88 static const float rotation[NUM_SQUARES] = {
  89         0.0,
  90         0.1,
  91         0.2,
  92         0.3
  93 };
  94
  95 static GLuint prog;
  96 static GLuint buffers[NUM_UBOS];
  97 static GLint alignment;
  98 static bool test_buffer_offset = false;
  99
 100
 101 static void
 102 setup_ubos(void)
 103 {
 104         static const char *names[NUM_UBOS] = {
 105                 "ub_pos_size",
 106                 "ub_color",
 107                 "ub_rot"
 108         };
 109         static GLubyte zeros[1000] = {0};
 110         int i;
 111
 112         glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &alignment);
 113         printf("GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT = %d\n", alignment);
 114
 115         if (test_buffer_offset) {
 116                 printf("Testing buffer offset %d\n", alignment);
 117         }
 118         else {
 119                 /* we use alignment as the offset */
 120                 alignment = 0;
 121         }
 122
 123         glGenBuffers(NUM_UBOS, buffers);
 124
 125         for (i = 0; i < NUM_UBOS; i++) {
 126                 GLint index, size;
 127
 128                 /* query UBO index */
 129                 index = glGetUniformBlockIndex(prog, names[i]);
 130
 131                 /* query UBO size */
 132                 glGetActiveUniformBlockiv(prog, index,
 133                                           GL_UNIFORM_BLOCK_DATA_SIZE, &size);
 134
 135                 printf("UBO %s: index = %d, size = %d\n",
 136                        names[i], index, size);
 137
 138                 /* Allocate UBO */
 139                 /* XXX for some reason, this test doesn't work at all with
 140                  * nvidia if we pass NULL instead of zeros here.  The UBO data
 141                  * is set/overwritten in the piglit_display() function so this
 142                  * really shouldn't matter.
 143                  */
 144                 glBindBuffer(GL_UNIFORM_BUFFER, buffers[i]);
 145                 glBufferData(GL_UNIFORM_BUFFER, size + alignment,
 146                              zeros, GL_DYNAMIC_DRAW);
 147
 148                 /* Attach UBO */
 149                 glBindBufferRange(GL_UNIFORM_BUFFER, i, buffers[i],
 150                                   alignment,  /* offset */
 151                                   size);
 152                 glUniformBlockBinding(prog, index, i);
 153
 154                 if (!piglit_check_gl_error(GL_NO_ERROR))
 155                         piglit_report_result(PIGLIT_FAIL);
 156         }
 157 }
 158
 159
 160 void
 161 piglit_init(int argc, char **argv)
 162 {
 163         piglit_require_extension("GL_ARB_uniform_buffer_object");
 164
 165         if (argc > 1 && strcmp(argv[1], "offset") == 0) {
 166                 test_buffer_offset = true;
 167         }
 168
 169         prog = piglit_build_simple_program(vert_shader_text, frag_shader_text);
 170         assert(prog);
 171         glUseProgram(prog);
 172
 173         setup_ubos();
 174
 175         glClearColor(0.2, 0.2, 0.2, 0.2);
 176 }
 177
 178
 179 static bool
 180 probe(int x, int y, int color_index)
 181 {
 182         float expected[4];
 183
 184         /* mul color by color_scale */
 185         expected[0] = color[color_index][0] * color[color_index][4];
 186         expected[1] = color[color_index][1] * color[color_index][4];
 187         expected[2] = color[color_index][2] * color[color_index][4];
 188         expected[3] = color[color_index][3] * color[color_index][4];
 189
 190         return piglit_probe_pixel_rgba(x, y, expected);
 191 }
 192
 193
 194 enum piglit_result
 195 piglit_display(void)
 196 {
 197         bool pass = true;
 198         int x0 = piglit_width / 4;
 199         int x1 = piglit_width * 3 / 4;
 200         int y0 = piglit_height / 4;
 201         int y1 = piglit_height * 3 / 4;
 202         int i;
 203
 204         glViewport(0, 0, piglit_width, piglit_height);
 205
 206         glClear(GL_COLOR_BUFFER_BIT);
 207
 208         for (i = 0; i < NUM_SQUARES; i++) {
 209                 /* Load UBO data, at offset=alignment */
 210                 glBindBuffer(GL_UNIFORM_BUFFER, buffers[0]);
 211                 glBufferSubData(GL_UNIFORM_BUFFER, alignment, sizeof(pos_size[0]),
 212                                 pos_size[i]);
 213                 glBindBuffer(GL_UNIFORM_BUFFER, buffers[1]);
 214                 glBufferSubData(GL_UNIFORM_BUFFER, alignment, sizeof(color[0]),
 215                                 color[i]);
 216                 glBindBuffer(GL_UNIFORM_BUFFER, buffers[2]);
 217                 glBufferSubData(GL_UNIFORM_BUFFER, alignment, sizeof(rotation[0]),
 218                                 &rotation[i]);
 219
 220                 if (!piglit_check_gl_error(GL_NO_ERROR))
 221                         return PIGLIT_FAIL;
 222
 223                 piglit_draw_rect(-1, -1, 2, 2);
 224         }
 225
 226         pass = probe(x0, y0, 0) && pass;
 227         pass = probe(x1, y0, 1) && pass;
 228         pass = probe(x0, y1, 2) && pass;
 229         pass = probe(x1, y1, 3) && pass;
 230
 231         piglit_present_results();
 232
 233         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 234 }