#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <GL/glut.h>
GLenum doubleBuffer;
double plane[4] = {
1.0, 0.0, -1.0, 0.0
};
float rotX = 5.0, rotY = -5.0, zTranslate = -65.0;
float fogDensity = 0.02;
GLint fogMode = GL_EXP;
#define DEFAULT_FOG_START -100.0
#define DEFAULT_FOG_END 100.0
float fogStart = DEFAULT_FOG_START;
float fogEnd = DEFAULT_FOG_END;
GLint cubeList = 1;
float scp[18][3] = {
{
1.000000, 0.000000, 0.000000
},
{
1.000000, 0.000000, 5.000000
},
{
0.707107, 0.707107, 0.000000
},
{
0.707107, 0.707107, 5.000000
},
{
0.000000, 1.000000, 0.000000
},
{
0.000000, 1.000000, 5.000000
},
{
-0.707107, 0.707107, 0.000000
},
{
-0.707107, 0.707107, 5.000000
},
{
-1.000000, 0.000000, 0.000000
},
{
-1.000000, 0.000000, 5.000000
},
{
-0.707107, -0.707107, 0.000000
},
{
-0.707107, -0.707107, 5.000000
},
{
0.000000, -1.000000, 0.000000
},
{
0.000000, -1.000000, 5.000000
},
{
0.707107, -0.707107, 0.000000
},
{
0.707107, -0.707107, 5.000000
},
{
1.000000, 0.000000, 0.000000
},
{
1.000000, 0.000000, 5.000000
},
};
static void Init(void)
{
static float ambient[] = {0.1, 0.1, 0.1, 1.0};
static float diffuse[] = {1.0, 1.0, 1.0, 1.0};
static float position[] = {90.0, 90.0, 0.0, 0.0};
static float front_mat_shininess[] = {30.0};
static float front_mat_specular[] = {0.0, 0.0, 0.0, 1.0};
static float front_mat_diffuse[] = {0.0, 1.0, 0.0, 1.0};
static float back_mat_shininess[] = {50.0};
static float back_mat_specular[] = {0.0, 0.0, 1.0, 1.0};
static float back_mat_diffuse[] = {1.0, 0.0, 0.0, 1.0};
static float lmodel_ambient[] = {0.0, 0.0, 0.0, 1.0};
static float fog_color[] = {0.8, 0.8, 0.8, 1.0};
glFrontFace(GL_CW);
glEnable(GL_DEPTH_TEST);
glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
glLightfv(GL_LIGHT0, GL_POSITION, position);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glMaterialfv(GL_FRONT, GL_SHININESS, front_mat_shininess);
glMaterialfv(GL_FRONT, GL_SPECULAR, front_mat_specular);
glMaterialfv(GL_FRONT, GL_DIFFUSE, front_mat_diffuse);
glMaterialfv(GL_BACK, GL_SHININESS, back_mat_shininess);
glMaterialfv(GL_BACK, GL_SPECULAR, back_mat_specular);
glMaterialfv(GL_BACK, GL_DIFFUSE, back_mat_diffuse);
glEnable(GL_FOG);
printf("Fog Color\t%f,%f,%f,%f\n\n",
fog_color[0],fog_color[1],fog_color[2],fog_color[3]);
printf("Initial Fog Mode\tGL_EXP\n");
printf("Initial Fog Density\t%f\n",fogDensity);
printf("Type h for help.\n");
glFogi(GL_FOG_MODE, fogMode);
glFogf(GL_FOG_DENSITY, fogDensity);
glFogfv(GL_FOG_COLOR, fog_color);
assert(glGetError() == GL_NO_ERROR);
glClearColor(fog_color[0], fog_color[1], fog_color[2], fog_color[3]);
glNewList(cubeList, GL_COMPILE);
glBegin(GL_TRIANGLE_STRIP);
glNormal3fv(scp[0]); glVertex3fv(scp[0]);
glNormal3fv(scp[0]); glVertex3fv(scp[1]);
glNormal3fv(scp[2]); glVertex3fv(scp[2]);
glNormal3fv(scp[2]); glVertex3fv(scp[3]);
glNormal3fv(scp[4]); glVertex3fv(scp[4]);
glNormal3fv(scp[4]); glVertex3fv(scp[5]);
glNormal3fv(scp[6]); glVertex3fv(scp[6]);
glNormal3fv(scp[6]); glVertex3fv(scp[7]);
glNormal3fv(scp[8]); glVertex3fv(scp[8]);
glNormal3fv(scp[8]); glVertex3fv(scp[9]);
glNormal3fv(scp[10]); glVertex3fv(scp[10]);
glNormal3fv(scp[10]); glVertex3fv(scp[11]);
glNormal3fv(scp[12]); glVertex3fv(scp[12]);
glNormal3fv(scp[12]); glVertex3fv(scp[13]);
glNormal3fv(scp[14]); glVertex3fv(scp[14]);
glNormal3fv(scp[14]); glVertex3fv(scp[15]);
glNormal3fv(scp[16]); glVertex3fv(scp[16]);
glNormal3fv(scp[16]); glVertex3fv(scp[17]);
glEnd();
glEndList();
}
static void Reshape(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, 1.0, 1.0, 200.0);
glMatrixMode(GL_MODELVIEW);
}
static void Key(unsigned char key, int x, int y)
{
GLfloat getFloat[1];
switch (key) {
case 'd':
if (fogMode != GL_EXP) { /* switch fog mode iff different */
fogMode = GL_EXP;
glFogi(GL_FOG_MODE, fogMode);
printf("Switching fog modes...\n");
}
fogDensity *= 1.10;
glFogf(GL_FOG_DENSITY, fogDensity);
printf("Fog Mode/Density\tGL_EXP/%f\n",fogDensity);
assert(glGetError() == GL_NO_ERROR);
glGetFloatv(GL_FOG_DENSITY,getFloat);assert(getFloat[0] == fogDensity);
glutPostRedisplay();
break;
case 'D':
if (fogMode != GL_EXP) { /* switch fog mode iff different */
fogMode = GL_EXP;
glFogi(GL_FOG_MODE, fogMode);
printf("Switching fog modes...\n");
}
fogDensity /= 1.10;
glFogf(GL_FOG_DENSITY, fogDensity);
printf("Fog Mode/Density\tGL_EXP/%f\n",fogDensity);
assert(glGetError() == GL_NO_ERROR);
glGetFloatv(GL_FOG_DENSITY,getFloat);assert(getFloat[0] == fogDensity);
glutPostRedisplay();
break;
case 's':
if (fogMode != GL_LINEAR) { /* switch fog mode iff different */
fogMode = GL_LINEAR;
glFogi(GL_FOG_MODE,fogMode);
glFogf(GL_FOG_END,fogEnd);
printf("Switching fog modes...\n");
}
fogStart += 1.0;
glFogf(GL_FOG_START,fogStart);
printf("Fog Mode[Start,End]\tGL_LINEAR[%f,%f]\n",fogStart,fogEnd);
assert(glGetError() == GL_NO_ERROR);
glGetFloatv(GL_FOG_START,getFloat); assert(fogStart == getFloat[0]);
glGetFloatv(GL_FOG_END,getFloat); assert(fogEnd == getFloat[0]);
glutPostRedisplay();
break;
case 'S':
if (fogMode != GL_LINEAR) { /* switch fog mode iff different */
fogMode = GL_LINEAR;
glFogi(GL_FOG_MODE,fogMode);
glFogf(GL_FOG_END,fogEnd);
printf("Switching fog modes...\n");
}
fogStart -= 1.0;
glFogf(GL_FOG_START,fogStart);
printf("Fog Mode[Start,End]\tGL_LINEAR[%f,%f]\n",fogStart,fogEnd);
assert(glGetError() == GL_NO_ERROR);
glGetFloatv(GL_FOG_START,getFloat); assert(fogStart == getFloat[0]);
glGetFloatv(GL_FOG_END,getFloat); assert(fogEnd == getFloat[0]);
glutPostRedisplay();
break;
case 'e':
if (fogMode != GL_LINEAR) { /* switch fog mode iff different */
fogMode = GL_LINEAR;
glFogi(GL_FOG_MODE,fogMode);
glFogf(GL_FOG_START,fogStart);
printf("Switching fog modes...\n");
}
fogEnd += 1.0;
glFogf(GL_FOG_END,fogEnd);
printf("Fog Mode[Start,End]\tGL_LINEAR[%f,%f]\n",fogStart,fogEnd);
assert(glGetError() == GL_NO_ERROR);
glGetFloatv(GL_FOG_START,getFloat); assert(fogStart == getFloat[0]);
glGetFloatv(GL_FOG_END,getFloat); assert(fogEnd == getFloat[0]);
glutPostRedisplay();
break;
case 'E':
if (fogMode != GL_LINEAR) { /* switch fog mode iff different */
fogMode = GL_LINEAR;
glFogi(GL_FOG_MODE,fogMode);
glFogf(GL_FOG_START,fogStart);
printf("Switching fog modes...\n");
}
fogEnd -= 1.0;
glFogf(GL_FOG_END,fogEnd);
printf("Fog Mode[Start,End]\tGL_LINEAR[%f,%f]\n",fogStart,fogEnd);
assert(glGetError() == GL_NO_ERROR);
glGetFloatv(GL_FOG_START,getFloat); assert(fogStart == getFloat[0]);
glGetFloatv(GL_FOG_END,getFloat); assert(fogEnd == getFloat[0]);
glutPostRedisplay();
break;
case 'h': case 'H': case '?':
printf("d\tset fog mode to GL_EXP and increase fog density by 10%%\n");
printf("D\tset fog mode to GL_EXP and decrease fog density by 10%%\n");
printf("s\tset fog mode to GL_LINEAR and increase fog start by 1.0\n");
printf("S\tset fog mode to GL_LINEAR and decrease fog start by 1.0\n");
printf("e\tset fog mode to GL_LINEAR and increase fog end by 1.0\n");
printf("E\tset fog mode to GL_LINEAR and decrease fog end by 1.0\n");
printf("r, R\trefresh\n");
printf("\nh, H, ?\tthis help message\n");
printf("ESC\texit\n");
break;
case 27:
exit(0);
}
}
static void SpecialKey(int key, int x, int y)
{
switch (key) {
case GLUT_KEY_UP:
rotX -= 5;
glutPostRedisplay();
break;
case GLUT_KEY_DOWN:
rotX += 5;
glutPostRedisplay();
break;
case GLUT_KEY_LEFT:
rotY -= 5;
glutPostRedisplay();
break;
case GLUT_KEY_RIGHT:
rotY += 5;
glutPostRedisplay();
break;
}
}
static void Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(0, 0, zTranslate);
glRotatef(rotY, 0,1,0);
glRotatef(rotX, 1,0,0);
glScalef(1.0, 1.0, 10.0);
glCallList(cubeList);
glPopMatrix();
if (doubleBuffer) {
glutSwapBuffers();
} else {
glFlush();
}
}
static void Args(int argc, char **argv)
{
GLint i;
doubleBuffer = GL_FALSE;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-sb") == 0) {
doubleBuffer = GL_FALSE;
} else if (strcmp(argv[i], "-db") == 0) {
doubleBuffer = GL_TRUE;
}
}
}
int main(int argc, char **argv)
{
GLenum type;
glutInit(&argc, argv);
Args(argc, argv);
type = GLUT_RGB | GLUT_DEPTH;
type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
glutInitDisplayMode(type);
glutInitWindowSize(300, 300);
glutCreateWindow("Fog Test");
Init();
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutSpecialFunc(SpecialKey);
glutDisplayFunc(Draw);
glutMainLoop();
}
![[BACK]](/icons/back.gif){kind=icon}
Return to fog.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [Development] / projects / ogl-sample / main / gfx / samples / samples