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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_clip.c
*
* This test verifies that the clipper 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.
*
* As with the vertex information, there seems to be a clause which allows
* implementations to make non-deterministic values (13.5 quoted below).
*
* 13.5 (the chicken clause)
*
* Implementations are allowed to pass incoming primitives unchanged and to
* output multiple primitives for an incoming primitive due to implementation
* dependent reasons as long as the results of rendering otherwise remain
* unchanged.
*
* 13.5.2
* When BeginQuery is called with a target of CLIPPING_INPUT_PRIMITIVES_ARB,
* the clipping input primitives count maintained by the GL is set to zero.
* When a clipping input primitives query is active, the counter is
* incremented every time a primitive reaches the primitive clipping stage
* (see section 13.5).
*
* When BeginQuery is called with a target of CLIPPING_OUTPUT_PRIMITIVES_ARB,
* the clipping output primitives count maintained by the GL is set to zero.
* When a clipping output primitives query is active, the counter is
* incremented every time a primitive passes the primitive clipping stage.
* The actual number of primitives output by the primitive clipping stage for
* a particular input primitive is implementation dependent (see section 13.5)
* but must satisfy the following conditions.
*
* (Chicken clause 2)
* If RASTERIZER_DISCARD is enabled, implementations are allowed to
* discard primitives right after the optional transform feedback state
* (see Section 14.1). As a result, if RASTERIZER_DISCARD is enabled,
* the clipping input and output primitives count may not be
* incremented.
*
* To me, this makes it sound like this is impossible to test RASTERIZER_DISCARD
* reliably, so I won't bother.
*/
#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;
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 struct query queries[] = {
{
.query = GL_CLIPPING_INPUT_PRIMITIVES_ARB,
.min = NUM_PRIMS},
{
.query = GL_CLIPPING_OUTPUT_PRIMITIVES_ARB,
.min = NUM_PRIMS}
};
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 vs, prog;
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
piglit_require_gl_version(11);
piglit_require_GLSL();
do_query_init(queries, ARRAY_SIZE(queries));
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_src);
prog = glCreateProgram();
glAttachShader(prog, vs);
glLinkProgram(prog);
if (!piglit_link_check_status(prog)) {
glDeleteProgram(prog);
piglit_report_result(PIGLIT_FAIL);
}
glUseProgram(prog);
}
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