TFOG.C

/* 
 * (c) Copyright 1993, Silicon Graphics, Inc. 
 *               1993-1995 Microsoft Corporation 
 * 
 * ALL RIGHTS RESERVED 
 * 
 * Please refer to OpenGL/readme.txt for additional information 
 * 
 */ 
 
#include "glos.h" 
 
#include <stdio.h> 
#include <string.h> 
#include <stdlib.h> 
#include <gl\glaux.h> 
 
static void Build_lists(void ); 
static void Init(void ); 
static void CALLBACK Reshape(int width,int height); 
static void CALLBACK Key_UP(void ); 
static void CALLBACK Key_DOWN(void ); 
static void CALLBACK Key_LEFT(void ); 
static void CALLBACK Key_RIGHT(void ); 
static void CALLBACK Key_D(void ); 
static void CALLBACK Key_d(void ); 
static void CALLBACK Draw(void ); 
static GLenum Args(int argc,char **argv ); 
 
GLenum rgb, 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 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 Build_lists(void) 
{ 
 
    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 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); 
 
    glDepthFunc(GL_LEQUAL); 
    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); 
    glFogi(GL_FOG_MODE, GL_EXP); 
    glFogf(GL_FOG_DENSITY, fogDensity); 
    if (rgb) { 
    glFogfv(GL_FOG_COLOR, fog_color); 
    glClearColor(0.8, 0.8, 0.8, 1.0); 
    } else { 
    glFogi(GL_FOG_INDEX, 1<<5); 
    auxSetFogRamp(5, 3); 
    glClearIndex(128); 
    } 
 
    Build_lists(); 
} 
 
static void CALLBACK Reshape(int width, int height) 
{ 
 
    glViewport(0, 0, (GLint)width, (GLint)height); 
 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    gluPerspective(45.0, 1.0, 1.0, 200.0); 
    glMatrixMode(GL_MODELVIEW); 
} 
 
static void CALLBACK Key_UP(void) 
{ 
    rotX -= 5; 
} 
 
static void CALLBACK Key_DOWN(void) 
{ 
    rotX += 5; 
} 
 
static void CALLBACK Key_LEFT(void) 
{ 
    rotY -= 5; 
} 
 
static void CALLBACK Key_RIGHT(void) 
{ 
    rotY += 5; 
} 
 
static void CALLBACK Key_D(void) 
{ 
    if (rgb) { 
        fogDensity *= 1.10; 
        glFogf(GL_FOG_DENSITY, fogDensity); 
    } 
} 
 
static void CALLBACK Key_d(void) 
{ 
    if (rgb) { 
        fogDensity /= 1.10; 
        glFogf(GL_FOG_DENSITY, fogDensity); 
    } 
} 
 
static void CALLBACK 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(); 
 
    glFlush(); 
 
    if (doubleBuffer) { 
    auxSwapBuffers(); 
    } 
} 
 
static GLenum Args(int argc, char **argv) 
{ 
    GLint i; 
 
    rgb = GL_TRUE; 
    doubleBuffer = GL_FALSE; 
 
 
    for (i = 1; i < argc; i++) { 
    if (strcmp(argv[i], "-ci") == 0) { 
        rgb = GL_FALSE; 
    } else if (strcmp(argv[i], "-rgb") == 0) { 
        rgb = GL_TRUE; 
    } else if (strcmp(argv[i], "-sb") == 0) { 
        doubleBuffer = GL_FALSE; 
    } else if (strcmp(argv[i], "-db") == 0) { 
        doubleBuffer = GL_TRUE; 
    } else { 
        //printf("%s (Bad option).\n", argv[i]); 
        return GL_FALSE; 
    } 
    } 
    return GL_TRUE; 
} 
 
void main(int argc, char **argv) 
{ 
    GLenum type; 
 
    if (Args(argc, argv) == GL_FALSE) { 
    auxQuit(); 
    } 
 
    auxInitPosition(0, 0, 300, 300); 
 
    type = AUX_DEPTH16; 
    type |= (rgb) ? AUX_RGB : AUX_INDEX; 
    type |= (doubleBuffer) ? AUX_DOUBLE : AUX_SINGLE; 
 
    auxInitDisplayMode(type); 
 
    if (auxInitWindow("Fog Test") == GL_FALSE) { 
    auxQuit(); 
    } 
 
    Init(); 
 
    auxExposeFunc((AUXEXPOSEPROC)Reshape); 
    auxReshapeFunc((AUXRESHAPEPROC)Reshape); 
    auxKeyFunc(AUX_UP, Key_UP); 
    auxKeyFunc(AUX_DOWN, Key_DOWN); 
    auxKeyFunc(AUX_LEFT, Key_LEFT); 
    auxKeyFunc(AUX_RIGHT, Key_RIGHT); 
    auxKeyFunc(AUX_D, Key_D); 
    auxKeyFunc(AUX_d, Key_d); 
    auxMainLoop(Draw); 
}