TDEPTH.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> 
 
 
#define CI_OFFSET_1 32 
#define CI_OFFSET_2 48 
 
static void Init(void ); 
static void CALLBACK Reshape(int width,int height); 
static void CALLBACK Key_1(void ); 
static void CALLBACK Key_2(void ); 
static void CALLBACK Draw(void ); 
static GLenum Args(int argc,char **argv ); 
 
GLenum rgb, doubleBuffer, directRender; 
 
GLenum antiAlias, stipple; 
GLubyte stippleBits[32*4] = { 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 
}; 
 
 
static void Init(void) 
{ 
    GLint i; 
 
    glClearColor(0.0, 0.0, 0.0, 0.0); 
    glClearIndex(0.0); 
 
    if (!rgb) { 
    for (i = 0; i < 16; i++) { 
        auxSetOneColor(i+CI_OFFSET_1, 0.0, 0.0, i/15.0); 
        auxSetOneColor(i+CI_OFFSET_2, 0.0, i/15.0, 0.0); 
    } 
    } 
 
    antiAlias = GL_FALSE; 
    stipple = GL_FALSE; 
} 
 
static void CALLBACK Reshape(int width, int height) 
{ 
 
    glViewport(0, 0, (GLint)width, (GLint)height); 
 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); 
    glMatrixMode(GL_MODELVIEW); 
} 
 
static void CALLBACK Key_1(void) 
{ 
    antiAlias = !antiAlias; 
} 
 
static void CALLBACK Key_2(void) 
{ 
    stipple = !stipple; 
} 
 
static void CALLBACK Draw(void) 
{ 
    GLint ci1, ci2; 
    float blue[3] = { 0.0, 0.0, 1.0 }; 
    float green[3] = { 0.0, 1.0, 0.0 }; 
 
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); 
 
    if (antiAlias) { 
    ci1 = CI_OFFSET_1; 
    ci2 = CI_OFFSET_2; 
    glBlendFunc(GL_SRC_ALPHA, GL_ONE); 
    glEnable(GL_BLEND); 
    glEnable(GL_POLYGON_SMOOTH); 
    glDisable(GL_DEPTH_TEST); 
    } else { 
    ci1 = AUX_BLUE; 
    ci2 = AUX_GREEN; 
    glDisable(GL_BLEND); 
    glDisable(GL_POLYGON_SMOOTH); 
    glEnable(GL_DEPTH_TEST); 
    } 
 
    if (stipple) { 
    glPolygonStipple(stippleBits); 
    glEnable(GL_POLYGON_STIPPLE); 
    } else { 
    glDisable(GL_POLYGON_STIPPLE); 
    } 
 
    glBegin(GL_TRIANGLES); 
    (rgb) ? glColor3fv(blue) : glIndexi(ci1); 
    glVertex3f( 0.9, -0.9, -30.0); 
    glVertex3f( 0.9,  0.9, -30.0); 
    glVertex3f(-0.9,  0.0, -30.0); 
    (rgb) ? glColor3fv(green) : glIndexi(ci2); 
    glVertex3f(-0.9, -0.9, -40.0); 
    glVertex3f(-0.9,  0.9, -40.0); 
    glVertex3f( 0.9,  0.0, -25.0); 
    glEnd(); 
 
    glFlush(); 
 
    if (doubleBuffer) { 
    auxSwapBuffers(); 
    } 
} 
 
static GLenum Args(int argc, char **argv) 
{ 
    GLint i; 
 
    rgb = GL_TRUE; 
    doubleBuffer = GL_FALSE; 
    directRender = 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 if (strcmp(argv[i], "-dr") == 0) { 
        directRender = GL_TRUE; 
    } else if (strcmp(argv[i], "-ir") == 0) { 
        directRender = GL_FALSE; 
    } 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("Depth Test") == GL_FALSE) { 
    auxQuit(); 
    } 
 
    Init(); 
 
    auxExposeFunc((AUXEXPOSEPROC)Reshape); 
    auxReshapeFunc((AUXRESHAPEPROC)Reshape); 
    auxKeyFunc(AUX_1, Key_1); 
    auxKeyFunc(AUX_2, Key_2); 
    auxMainLoop(Draw); 
}