TPOINT.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_RED AUX_RED 
#define CI_ANTI_ALIAS_GREEN 16 
#define CI_ANTI_ALIAS_YELLOW 32 
#define CI_ANTI_ALIAS_RED 48 
 
static void Init(void ); 
static void CALLBACK Reshape(int width,int height); 
static void CALLBACK Key_1(void ); 
static void CALLBACK Key_W(void ); 
static void CALLBACK Key_w(void ); 
static void CALLBACK Key_LEFT(void ); 
static void CALLBACK Key_RIGHT(void ); 
static void CALLBACK Key_UP(void ); 
static void CALLBACK Key_DOWN(void ); 
static void CALLBACK Draw(void ); 
static GLenum Args(int argc,char **argv ); 
 
GLenum rgb, doubleBuffer, windType; 
GLint windW, windH; 
 
GLenum mode; 
GLint size; 
float point[3] = { 
    1.0, 1.0, 0.0 
}; 
 
 
static void Init(void) 
{ 
    GLint i; 
 
    glClearColor(0.0, 0.0, 0.0, 0.0); 
 
    glBlendFunc(GL_SRC_ALPHA, GL_ZERO); 
 
    if (!rgb) { 
    for (i = 0; i < 16; i++) { 
        auxSetOneColor(i+CI_ANTI_ALIAS_RED, i/15.0, 0.0, 0.0); 
        auxSetOneColor(i+CI_ANTI_ALIAS_YELLOW, i/15.0, i/15.0, 0.0); 
        auxSetOneColor(i+CI_ANTI_ALIAS_GREEN, 0.0, i/15.0, 0.0); 
    } 
    } 
 
    mode = GL_FALSE; 
    size = 1; 
} 
 
static void CALLBACK Reshape(int width, int height) 
{ 
 
    windW = (GLint)width; 
    windH = (GLint)height; 
 
    glViewport(0, 0, width, height); 
 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    gluOrtho2D(-windW/2, windW/2, -windH/2, windH/2); 
    glMatrixMode(GL_MODELVIEW); 
} 
 
static void CALLBACK Key_1(void) 
{ 
    mode = !mode; 
} 
 
static void CALLBACK Key_W(void) 
{ 
    size++; 
} 
 
static void CALLBACK Key_w(void) 
{ 
    size--; 
    if (size < 1) { 
        size = 1; 
    } 
} 
 
static void CALLBACK Key_LEFT(void) 
{ 
    point[0] -= 0.25; 
} 
 
static void CALLBACK Key_RIGHT(void) 
{ 
    point[0] += 0.25; 
} 
 
static void CALLBACK Key_UP(void) 
{ 
    point[1] += 0.25; 
} 
 
static void CALLBACK Key_DOWN(void) 
{ 
    point[1] -= 0.25; 
} 
 
static void CALLBACK Draw(void) 
{ 
 
    glClear(GL_COLOR_BUFFER_BIT); 
 
    AUX_SETCOLOR(windType, AUX_YELLOW); 
    glBegin(GL_LINE_STRIP); 
    glVertex2f(-windW/2, 0); 
    glVertex2f(windW/2, 0); 
    glEnd(); 
    glBegin(GL_LINE_STRIP); 
    glVertex2f(0, -windH/2); 
    glVertex2f(0, windH/2); 
    glEnd(); 
 
    if (mode) { 
    glEnable(GL_BLEND); 
    glEnable(GL_POINT_SMOOTH); 
    } else { 
    glDisable(GL_BLEND); 
    glDisable(GL_POINT_SMOOTH); 
    } 
 
    glPointSize(size); 
    if (mode) { 
    (rgb) ? glColor3f(1.0, 0.0, 0.0) : glIndexf(CI_ANTI_ALIAS_RED); 
    } else { 
    (rgb) ? glColor3f(1.0, 0.0, 0.0) : glIndexf(CI_RED); 
    } 
    glBegin(GL_POINTS); 
    glVertex3fv(point); 
    glEnd(); 
 
    glDisable(GL_POINT_SMOOTH); 
 
    glPointSize(1); 
    AUX_SETCOLOR(windType, AUX_GREEN); 
    glBegin(GL_POINTS); 
    glVertex3fv(point); 
    glEnd(); 
 
    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) 
{ 
 
    if (Args(argc, argv) == GL_FALSE) { 
    auxQuit(); 
    } 
 
    windW = 300; 
    windH = 300; 
    auxInitPosition(0, 0, windW, windH); 
 
    windType |= (rgb) ? AUX_RGB : AUX_INDEX; 
    windType |= (doubleBuffer) ? AUX_DOUBLE : AUX_SINGLE; 
 
    auxInitDisplayMode(windType); 
 
    if (auxInitWindow("Point Test") == GL_FALSE) { 
    auxQuit(); 
    } 
 
    Init(); 
 
    auxExposeFunc((AUXEXPOSEPROC)Reshape); 
    auxReshapeFunc((AUXRESHAPEPROC)Reshape); 
    auxKeyFunc(AUX_1, Key_1); 
    auxKeyFunc(AUX_W, Key_W); 
    auxKeyFunc(AUX_w, Key_w); 
    auxKeyFunc(AUX_LEFT, Key_LEFT); 
    auxKeyFunc(AUX_RIGHT, Key_RIGHT); 
    auxKeyFunc(AUX_UP, Key_UP); 
    auxKeyFunc(AUX_DOWN, Key_DOWN); 
    auxMainLoop(Draw); 
}