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/*
* Copyright © 2013 Henri Verbeet <hverbeet@gmail.com>
*
* 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 glsl-fs-fogscale.c
*
* Tests that gl_Fog.scale is equivalent to
* "1.0 / (gl_Fog.end - gl_Fog.start)" when fog start and end are equal. The
* expectation is that 1.0 / 0.0 will produce a value similar to +INF. This
* takes into account that some GPUs may not have a representation for INF.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 20;
config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
enum piglit_result
piglit_display(void)
{
static const float green[] = {0.0f, 1.0f, 0.0f, 1.0f};
static const float red[] = {1.0f, 0.0f, 0.0f, 1.0f};
bool pass = true;
glClearColor(0.0, 0.0, 1.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
piglit_draw_rect(-1, -1, 2, 2);
pass = piglit_probe_rect_rgba(0, 0,
piglit_width / 2, piglit_height,
green) && pass;
pass = piglit_probe_rect_rgba(piglit_width / 2, 0,
piglit_width / 2, piglit_height,
red) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
static const char vs_source[] =
"void main()\n"
"{\n"
" gl_Position = gl_Vertex;\n"
" gl_FogFragCoord = gl_Position.x;\n"
"}\n";
static const char fs_source[] =
"void main()\n"
"{\n"
" gl_FragColor = vec4(gl_FogFragCoord * gl_Fog.scale * vec2(1.0, -1.0), 0.0, 1.0);\n"
"}\n";
GLuint prog;
prog = piglit_build_simple_program(vs_source, fs_source);
glFogf(GL_FOG_START, 0.0f);
glFogf(GL_FOG_END, 0.0f);
glUseProgram(prog);
}
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