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/*
* Copyright © 2014 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 pipeline_stats_frag.c
*
* This test verifies that the fragment shader related tokens of
* ARB_pipeline_statistics_query() work as expected. I believe these values
* are safe to use on all hardware but I am not certain. One again we get the
* beloved, "can't rely on values clause." For the most part this makes senes
* since implementations can very well process too many vertices - but the
* clause also allows too few. The former case is accounted for within this code.
*
* 15.2 (Another chicken clause)
* Implementations are allowed to skip the execution of certain fragment
* shader invocations, and to execute additional fragment shader invocations
* during programmable fragment processing due to implementation dependent
* reasons, including the execution of fragment shader invocations when there
* isn't an active program object present for the fragment shader stage, as
* long as the results of rendering otherwise remain unchanged.
*
* 15.3
* When BeginQuery is called with a target of FRAGMENT_SHADER_INVOCATIONS_ARB,
* the fragment shader invocations count maintained by the GL is set to zero.
* When a fragment shader invocations query is active, the counter is
* incremented every time the fragment shader is invoked (see section 15.2).
* The result of fragment shader queries may be implementation dependent due
* to reasons described in section 15.2.
*/
#include "piglit-util-gl.h"
#include "pipestat_help.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 30;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
config.window_width = TEST_WIDTH;
config.window_height = TEST_HEIGHT;
PIGLIT_GL_TEST_CONFIG_END
static const char *vs_src =
"#version 110 \n"
" \n"
"void main() \n"
"{ \n"
" gl_Position = gl_Vertex; \n"
"} \n";
static const char *fs_src =
"#version 110 \n"
" \n"
"void main() \n"
"{ \n"
" gl_FragColor = vec4(0, 1, 0, 1); \n"
"} \n";
static struct query queries[] = {
{
.query = GL_FRAGMENT_SHADER_INVOCATIONS_ARB,
.min = TEST_WIDTH * TEST_HEIGHT,
.max = TEST_WIDTH * TEST_HEIGHT * 3 / 2},
/* XXX:
* Intel hardware has some very unpredictable results for fragment
* shader invocations. After a day of head scratching, I've given up.
* Generating a real min, or max is not possible. The spec allows this.
* This will also help variance across vendors.
*/
};
enum piglit_result
piglit_display(void)
{
enum piglit_result ret = do_query(queries, ARRAY_SIZE(queries));
#ifdef DISPLAY
piglit_present_results();
#endif
return ret;
}
void
piglit_init(int argc, char *argv[])
{
GLuint prog;
piglit_require_gl_version(11);
piglit_require_GLSL();
do_query_init(queries, ARRAY_SIZE(queries));
prog = piglit_build_simple_program(vs_src, fs_src);
glUseProgram(prog);
}
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