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/*
* Copyright © 2011 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 max-clip-distances.c
*
* From the GLSL 1.30 spec, section 7.4 (Built-In Constants):
*
* "The following built-in constants are provided to vertex and
* fragment shaders. The actual values used are implementation
* dependent, but must be at least the value shown.
*
* ...
*
* const int gl_MaxClipDistances = 8;
*
* ...
*
* const int gl_MaxClipPlanes = 8; // deprecated"
*
* And from the GL 3.0 spec, section N.3 (Changed Tokens):
*
* "New token names are introduced to be used in place of old,
* inconsistent names. However, the old token names continue to be
* supported, for backwards compatibility with code written for
* previous versions of OpenGL.
*
* ...
*
* New Token Name Old Token Name
* ...
* MAX_CLIP_DISTANCES MAX_CLIP_PLANES
*
* This test verifies that glGetIntegerv() returns the same result for
* the tokens MAX_CLIP_DISTANCES and MAX_CLIP_PLANES, that this value
* matches the value of gl_MaxClipDistances and gl_MaxClipPlanes
* defined in the vertex and fragment shaders, and that this value is
* at least 8.
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_MAIN(
100 /*window_width*/,
100 /*window_height*/,
PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE)
static const char vert[] =
"#version 130\n"
"uniform int expected_value;\n"
"uniform bool test_distances;\n"
"uniform bool test_in_vs;\n"
"void main()\n"
"{\n"
" gl_Position = gl_Vertex;\n"
" if (test_in_vs) {\n"
" int value = test_distances ? gl_MaxClipDistances\n"
" : gl_MaxClipPlanes;\n"
" gl_FrontColor = (value == expected_value)\n"
" ? vec4(0.0, 1.0, 0.0, 1.0)\n"
" : vec4(1.0, 0.0, 0.0, 1.0);\n"
" }\n"
"}\n";
static const char frag[] =
"#version 130\n"
"uniform int expected_value;\n"
"uniform bool test_distances;\n"
"uniform bool test_in_vs;\n"
"void main()\n"
"{\n"
" if (test_in_vs) {\n"
" gl_FragColor = gl_Color;\n"
" } else {\n"
" int value = test_distances ? gl_MaxClipDistances\n"
" : gl_MaxClipPlanes;\n"
" gl_FragColor = (value == expected_value)\n"
" ? vec4(0.0, 1.0, 0.0, 1.0)\n"
" : vec4(1.0, 0.0, 0.0, 1.0);\n"
" }\n"
"}\n";
GLuint prog;
enum piglit_result
piglit_display(void)
{
GLint max_clip_planes, max_clip_distances, expected_value;
GLint test_distances, test_in_vs;
float green[] = { 0.0, 1.0, 0.0, 1.0 };
GLint loc;
enum piglit_result result = PIGLIT_PASS;
glGetIntegerv(GL_MAX_CLIP_PLANES, &max_clip_planes);
printf("GL_MAX_CLIP_PLANES = %d\n", max_clip_planes);
glGetIntegerv(GL_MAX_CLIP_DISTANCES, &max_clip_distances);
printf("GL_MAX_CLIP_DISTANCES = %d\n", max_clip_distances);
if (max_clip_planes != max_clip_distances) {
printf("GL_MAX_CLIP_PLANES != GL_MAX_CLIP_DISTANCES\n");
piglit_report_result(PIGLIT_FAIL);
}
if (max_clip_distances < 8) {
printf("GL_MAX_CLIP_DISTANCES < 8\n");
piglit_report_result(PIGLIT_FAIL);
}
expected_value = max_clip_distances;
loc = piglit_GetUniformLocation(prog, "expected_value");
piglit_Uniform1i(loc, expected_value);
for (test_distances = 0; test_distances <= 1; ++test_distances) {
loc = piglit_GetUniformLocation(prog, "test_distances");
piglit_Uniform1i(loc, test_distances);
for (test_in_vs = 0; test_in_vs <= 1; ++test_in_vs) {
bool pass;
loc = piglit_GetUniformLocation(prog, "test_in_vs");
piglit_Uniform1i(loc, test_in_vs);
piglit_draw_rect(-1, -1, 2, 2);
pass = piglit_probe_rect_rgba(0, 0, piglit_width,
piglit_height, green);
printf("Checking that gl_MaxClip%s == %d in %s: %s\n",
test_distances ? "Distances" : "Planes",
expected_value,
test_in_vs ? "VS" : "FS",
pass ? "pass" : "fail");
if (!pass) {
result = PIGLIT_FAIL;
}
}
}
return result;
}
void
piglit_init(int argc, char **argv)
{
GLuint vs;
GLuint fs;
piglit_require_GLSL();
piglit_require_GLSL_version(130);
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag);
prog = piglit_CreateProgram();
piglit_AttachShader(prog, vs);
piglit_AttachShader(prog, fs);
piglit_LinkProgram(prog);
piglit_DeleteShader(vs);
piglit_DeleteShader(fs);
piglit_UseProgram(prog);
}
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