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/*
* Copyright © 2011 Intel Corporation
* Copyright © 2011 Vincent Lejeune
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/** @file layout-std140.c
*
* This test checks the conformance of offset and size returned by
* glGetActiveUniformsiv for uniform in a UBO whose layout is mandated
* by the std140 layout qualifier
*
* The example shader and expected values for offset and size are
* taken from the spec:
*
* http://www.opengl.org/registry/specs/ARB/uniform_buffer_object.txt
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
PIGLIT_GL_TEST_CONFIG_END
static GLuint prog;
static const struct result {
const char *name;
GLint offset;
GLint size;
} expected_result[] = {
{ "a", 0, 1 },
{ "b", 8, 1 },
{ "c", 16, 1 },
{ "f.d", 32, 1},
{ "f.e", 40, 1},
{ "g", 48, 1},
{ "h", 64, 2},
{ "i", 96, 1},
{ "o[0].j", 128, 1 },
{ "o[0].k", 144, 1 },
{ "o[0].l", 160, 2 },
{ "o[0].m", 192, 1 },
{ "o[0].n", 208, 2 },
{ "o[1].j", 304, 1 },
{ "o[1].k", 320, 1 },
{ "o[1].l", 336, 2 },
{ "o[1].m", 368, 1 },
{ "o[1].n", 384, 2 },
/* Section 2.11.4 (Uniform Variables), subsection Standard Uniform
* Block Layout, of the OpenGL 3.1 spec says (emphasis mine):
*
* "(9) If the member is a structure, the base alignment of the
* structure is <N>, where <N> is the largest base alignment value
* of any of its members, and *rounded up to the base alignment of
* a vec4*. The individual members of this sub-structure are then
* assigned offsets by applying this set of rules recursively,
* where the base offset of the first member of the sub-structure
* is equal to the aligned offset of the structure. The structure
* may have padding at the end; the base offset of the member
* following the sub-structure is rounded up to the next multiple
* of the base alignment of the structure."
*/
{ "s.s1.r", 0, 1 },
{ "s.s2.g", 16, 1 },
{ "s.s2.b", 20, 1 },
{ "s.s2.a", 24, 1 },
};
static const char frag_shader_text[] =
"#version 130\n"
"#extension GL_ARB_uniform_buffer_object : enable \n"
"\n"
"struct f_struct {\n"
" int d;\n"
" bvec2 e;\n"
"};\n"
"\n"
"struct o_struct {\n"
" uvec3 j;\n"
" vec2 k;\n"
" float l[2];\n"
" vec2 m;\n"
" mat3 n[2];\n"
"};\n"
"\n"
"layout(std140) uniform test_ubo { \n"
" float a;\n"
" vec2 b;\n"
" vec3 c;\n"
" f_struct f;\n"
" float g;\n"
" float h[2];\n"
" mat2x3 i;\n"
" o_struct o[2];\n"
"};\n"
"\n"
"struct S1 {\n"
" float r;\n"
"};\n"
"\n"
"struct S2 {\n"
" float g;\n"
" float b;\n"
" float a;\n"
"};\n"
"\n"
"struct S {\n"
" S1 s1;\n"
" S2 s2;\n"
"};\n"
"\n"
"layout(std140) uniform ubo1 {\n"
" S s;\n"
"};\n"
"\n"
"void main()\n"
"{\n"
" gl_FragColor = vec4(a + b.x + c.x + float(f.d) + g + h[0] + i[0].x + o[1].k.x + s.s1.r + s.s2.g + s.s2.b + s.s2.a);\n"
"}\n";
static void
init(void)
{
piglit_require_GLSL_version(130);
piglit_require_extension("GL_ARB_uniform_buffer_object");
prog = piglit_build_simple_program(NULL, frag_shader_text);
glUseProgram(prog);
}
static void
validate_offset_and_size()
{
unsigned i, index;
GLint offset, size;
bool pass = true;
printf("%8s%17s%10s%15s%8s\n",
"uniform",
"expected offset",
"offset",
"expected size",
"size");
for(i = 0; i < ARRAY_SIZE(expected_result); i++) {
glGetUniformIndices(prog, 1,
(const GLchar **)&expected_result[i].name,
&index);
if (index == GL_INVALID_INDEX) {
pass = false;
printf("%8s%17d%10s%15d%8s INACTIVE\n",
expected_result[i].name,
expected_result[i].offset,
"",
expected_result[i].size,
"");
continue;
}
glGetActiveUniformsiv(prog, 1, &index, GL_UNIFORM_OFFSET, &offset);
glGetActiveUniformsiv(prog, 1, &index, GL_UNIFORM_SIZE, &size);
if (offset != expected_result[i].offset ||
size != expected_result[i].size) {
pass = false;
printf("%8s%17d%10d%15d%8d FAIL\n",
expected_result[i].name,
expected_result[i].offset,
offset,
expected_result[i].size,
size);
} else {
printf("%8s%17d%10d%15d%8d PASS\n",
expected_result[i].name,
expected_result[i].offset,
offset,
expected_result[i].size,
size);
}
}
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
void
piglit_init(int argc, char **argv)
{
init();
validate_offset_and_size();
}
enum piglit_result piglit_display(void)
{
return PIGLIT_FAIL;
}
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