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/*
* Copyright © 2017 Fabian Bieler
*
* 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 linear-fog.c: Draw using linear fog in GLSL.
*
* Simple fog test with constant fog coordinates.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 20;
config.window_visual = PIGLIT_GL_VISUAL_RGBA;
config.khr_no_error_support = PIGLIT_NO_ERRORS;
PIGLIT_GL_TEST_CONFIG_END
static const char *vs_text =
"void main() {\n"
" gl_Position = gl_Vertex; \n"
" gl_FogFragCoord = gl_MultiTexCoord0.x; \n"
" gl_FrontColor = gl_Color; \n"
"}\n";
static const char *fs_text =
"void main() {\n"
" float bf = (gl_FogFragCoord - gl_Fog.start) * gl_Fog.scale; \n"
" gl_FragColor = mix(gl_Color, gl_Fog.color, bf); \n"
"}\n";
static const float vertex_color[] = {.25, .5, .75, .25};
static const float fog_color[] = {1, .5, 1, 0};
static const float fog_start = 100;
static const float fog_end = 200;
enum piglit_result
piglit_display(void)
{
bool pass = true;
for (int j = 0; j < 5; ++j) {
const float fog_coord = 100 + j * 25;
const float bf =
(fog_coord - fog_start) / (fog_end - fog_start);
float expected_color[4];
for (int i = 0; i < 4; ++i)
expected_color[i] = bf * fog_color[i] +
(1 - bf) * vertex_color[i];
glClear(GL_COLOR_BUFFER_BIT);
glTexCoord1f(fog_coord);
piglit_draw_rect(-1, -1, 2, 2);
pass = piglit_probe_pixel_rgba(piglit_width / 2,
piglit_height / 2,
expected_color) &&
pass;
}
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
const int program = piglit_build_simple_program(vs_text, fs_text);
glUseProgram(program);
glColor4fv(vertex_color);
glFogf(GL_FOG_START, fog_start);
glFogf(GL_FOG_END, fog_end);
glFogfv(GL_FOG_COLOR, fog_color);
}
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