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/*
* Copyright © 2012 Intel Corporation
*
* 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 getactiveuniformblockiv-uniform-block-data-size.c
*
* From the GL_ARB_uniform_buffer_object spec:
*
* "For uniform blocks laid out according to [std140] rules, the
* minimum buffer object size returned by the
* UNIFORM_BLOCK_DATA_SIZE query is derived by taking the offset
* of the last basic machine unit consumed by the last uniform of
* the uniform block (including any end-of-array or
* end-of-structure padding), adding one, and rounding up to the
* next multiple of the base alignment required for a vec4."
*/
#define _GNU_SOURCE
#include "piglit-util-gl-common.h"
#include "uniform-types.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.supports_gl_core_version = 31;
config.window_width = 10;
config.window_height = 10;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_ALPHA;
PIGLIT_GL_TEST_CONFIG_END
static int
align(int v, int a)
{
return (v + a - 1) & ~(a - 1);
}
static bool
test_format(const struct uniform_type *type, bool row_major)
{
/* Using 140 to get unsigned ints. */
const char *fs_template =
"#version 140\n"
"layout(std140) uniform ubo {\n"
" float align_test;\n"
" %s%s u;\n"
"};\n"
"\n"
"void main() {\n"
" gl_FragColor = vec4(align_test);\n"
"}\n";
char *fs_source;
GLuint fs, prog;
GLint data_size;
int expected;
const struct uniform_type *transposed_type;
if (row_major)
transposed_type = get_transposed_type(type);
else
transposed_type = type;
asprintf(&fs_source, fs_template,
row_major ? "layout(row_major) " : "",
type->type);
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_source);
prog = piglit_link_simple_program(0, fs);
if (!fs || !prog) {
fprintf(stderr, "Failed to compile shader:\n%s", fs_source);
piglit_report_result(PIGLIT_FAIL);
}
free(fs_source);
/* There's only one block, so it's uniform block 0. */
glGetActiveUniformBlockiv(prog, 0,
GL_UNIFORM_BLOCK_DATA_SIZE,
&data_size);
glDeleteShader(fs);
glDeleteProgram(prog);
/* "align_test" at the start of the UBO is a float, so our
* test uniform would start at byte 4 if not for alignment.
*/
expected = 4;
/* The actual space for our object. */
expected = align(expected, transposed_type->alignment);
expected += transposed_type->size;
/* Finally, align to a vec4 like std140 says. */
expected = align(expected, 16);
printf("%-20s %10s %10d %10d%s\n",
type->type,
row_major ? "y" : "n",
data_size,
expected,
data_size == expected ? "" : " FAIL");
return data_size == expected;
}
void
piglit_init(int argc, char **argv)
{
bool pass = true;
unsigned int i;
piglit_require_extension("GL_ARB_uniform_buffer_object");
piglit_require_GLSL_version(140);
printf("%-20s %10s %10s %10s\n",
"type", "row_major", "DATA_SIZE", "expected");
for (i = 0; uniform_types[i].type; i++) {
pass = test_format(&uniform_types[i], false) && pass;
pass = test_format(&uniform_types[i], true) && pass;
}
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
enum piglit_result piglit_display(void)
{
/* UNREACHED */
return PIGLIT_FAIL;
}
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