tests/spec/arb_uniform_buffer_object/layout-std140-base-size-and-alignment.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 layout-std140-base-size-and-alignment.c
  25  *
  26  * Tests that glGetActiveUniformsiv() returns the correct offset for
  27  * any basic type valid in std140, and for a float just following
  28  * that, thus testing the size and base alignment for them.
  29  */
  30
  31 #include "piglit-util-gl.h"
  32 #include "uniform-types.h"
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35
  36         config.supports_gl_compat_version = 10;
  37         config.supports_gl_core_version = 31;
  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 static int
  44 align(int v, int a)
  45 {
  46         return (v + a - 1) & ~(a - 1);
  47 }
  48
  49 static bool
  50 test_format(const struct uniform_type *type, bool row_major)
  51 {
  52         /* Using 140 to get unsigned ints. */
  53         const char *fs_template =
  54                 "#version 140\n"
  55                 "layout(std140) uniform ubo {\n"
  56                 "       float pad;\n"
  57                 "       %s %s u;\n"
  58                 "       float size_test;\n"
  59                 "};\n"
  60                 "\n"
  61                 "void main() {\n"
  62                 "       gl_FragColor = vec4(pad) + vec4(%s) + vec4(size_test);\n"
  63                 "}\n";
  64         char *fs_source;
  65         GLuint prog;
  66         const char *uniform_names[] = { "u", "size_test" };
  67         GLuint uniform_indices[2];
  68         GLint offsets[2];
  69         int offset, size, expected_offset;
  70         const struct uniform_type *transposed_type;
  71         bool pass;
  72         const char *deref;
  73
  74         if (row_major)
  75                 transposed_type = get_transposed_type(type);
  76         else
  77                 transposed_type = type;
  78
  79         if (type->size == 4)
  80                 deref = "u";
  81         else if (type->size <= 16)
  82                 deref = "u.x";
  83         else
  84                 deref = "u[0].x";
  85
  86         (void)!asprintf(&fs_source, fs_template,
  87                  row_major && type->size > 16 ? "layout(row_major) " : "",
  88                  type->type,
  89                  deref);
  90         prog = piglit_build_simple_program(NULL, fs_source);
  91         free(fs_source);
  92
  93         glGetUniformIndices(prog, 2, uniform_names, uniform_indices);
  94         glGetActiveUniformsiv(prog, 2, uniform_indices,
  95                               GL_UNIFORM_OFFSET, offsets);
  96
  97         glDeleteProgram(prog);
  98
  99         offset = offsets[0];
 100         size = offsets[1] - offsets[0];
 101
 102         /* "pad" at the start of the UBO is a float, so our test
 103          * uniform would start at byte 4 if not for alignment.
 104          */
 105         expected_offset = 4;
 106         expected_offset = align(expected_offset, transposed_type->alignment);
 107
 108         pass = (offset == expected_offset &&
 109                 size == transposed_type->size);
 110
 111         printf("%-10s %10s %8d %-16d %8d %-16d%s\n",
 112                type->type,
 113                row_major ? "y" : "n",
 114                offset,
 115                expected_offset,
 116                size,
 117                transposed_type->size,
 118                pass ? "" : " FAIL");
 119
 120         return pass;
 121 }
 122
 123 void
 124 piglit_init(int argc, char **argv)
 125 {
 126         bool pass = true;
 127         unsigned int i;
 128
 129         piglit_require_extension("GL_ARB_uniform_buffer_object");
 130         piglit_require_GLSL_version(140);
 131
 132         printf("%-10s %10s %8s %16s %8s %-16s\n",
 133                "type", "row_major",
 134                "offset", "expected offset", "size", "expected size");
 135
 136         for (i = 0; uniform_types[i].type; i++) {
 137                 pass = test_format(&uniform_types[i], false) && pass;
 138                 pass = test_format(&uniform_types[i], true) && pass;
 139         }
 140
 141         piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
 142 }
 143
 144 enum piglit_result piglit_display(void)
 145 {
 146         /* UNREACHED */
 147         return PIGLIT_FAIL;
 148 }