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/*
* Copyright © 2010 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 fog-modes.c
*
* Tests that the three fog modes work with fog enabled using the depth value.
*/
#include "piglit-util.h"
#include "piglit-framework.h"
#if defined(_MSC_VER)
#undef near
#undef far
#endif
int piglit_width = 100;
int piglit_height = 100;
int piglit_window_mode = GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE;
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
int i, mode;
float near = 0.0, far = 1.0;
GLfloat fogcolor[4] = {1, 1, 1, 1};
glEnable(GL_FOG);
glFogfv(GL_FOG_COLOR, fogcolor);
glColor4f(0, 0, 0, 0.5);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 1, 0, 1, -near, -far);
for (mode = 0; mode < 3; mode++) {
float y = mode / 3.0;
float h = 1.0 / 3.0;
switch (mode) {
case 0:
glFogi(GL_FOG_MODE, GL_LINEAR);
glFogf(GL_FOG_START, near);
glFogf(GL_FOG_END, far);
break;
case 1:
glFogi(GL_FOG_MODE, GL_EXP);
glFogf(GL_FOG_DENSITY, 2);
break;
case 2:
glFogi(GL_FOG_MODE, GL_EXP2);
glFogf(GL_FOG_DENSITY, 2);
break;
}
for (i = 0; i < 5; i++) {
float x = i / 5.0;
float w = 1.0 / 5.0;
float z = near + (far - near) * i / 5.0;
piglit_draw_rect_z(z, x, y, w, h);
}
}
for (mode = 0; mode < 3; mode++) {
float y = (mode + 0.5) / 3.0 * piglit_height;
for (i = 0; i < 5; i++) {
float x = (i + 0.5) / 5.0 * piglit_width;
float z = near + (far - near) * i / 5.0;
float f;
float color[4];
switch (mode) {
case 0:
f = (far - z) / (far - near);
break;
case 1:
f = expf(-(2.0 * z));
break;
case 2:
f = expf(-(2.0 * z) * (2.0 * z));
break;
}
if (f > 1.0)
f = 1.0;
if (f < 0.0)
f = 0.0;
color[0] = 1.0 - f;
color[1] = 1.0 - f;
color[2] = 1.0 - f;
color[3] = 0.5;
pass = pass & piglit_probe_pixel_rgba(x, y, color);
}
}
glutSwapBuffers();
return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
}
void piglit_init(int argc, char**argv)
{
}
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