TCOPY.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 Init(void ); 
static void CALLBACK Reshape(int width,int height); 
static void CALLBACK Key_Z(void ); 
static void CALLBACK Key_z(void ); 
static GLenum CALLBACK Mouse_left(struct _AUX_EVENTREC *event); 
static void CALLBACK Draw(void ); 
static GLenum Args(int argc,char **argv ); 
 
GLenum doubleBuffer; 
GLint windW, windH; 
 
char *fileName = 0; 
AUX_RGBImageRec *xximage; 
float point[3]; 
float zoom; 
GLint x, y; 
 
 
static void Init(void) 
{ 
 
    glClearColor(0.0, 0.0, 0.0, 0.0); 
 
    x = 0; 
    y = windH; 
    zoom = 1.8; 
} 
 
static void CALLBACK Reshape(int width, int height) 
{ 
 
    windW = (GLint)width; 
    windH = (GLint)height; 
 
    glViewport(0, 0, windW, windH); 
 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    gluOrtho2D(0, windW, 0, windH); 
    glMatrixMode(GL_MODELVIEW); 
} 
 
static void CALLBACK Key_Z(void) 
{ 
    zoom += 0.2; 
} 
 
static void CALLBACK Key_z(void) 
{ 
    zoom -= 0.2; 
    if (zoom < 0.2) { 
        zoom = 0.2; 
    } 
} 
 
static GLenum CALLBACK Mouse_left(AUX_EVENTREC *event) 
{ 
 
    x = event->data[AUX_MOUSEX]; 
    y = event->data[AUX_MOUSEY]; 
    return GL_TRUE; 
} 
 
static void CALLBACK Draw(void) 
{ 
 
    glClear(GL_COLOR_BUFFER_BIT); 
 
    point[0] = (windW / 2) - (xximage->sizeX / 2); 
    point[1] = (windH / 2) - (xximage->sizeY / 2); 
    point[2] = 0; 
    glRasterPos3fv(point); 
 
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 
    glPixelZoom(1.0, 1.0); 
    glDrawPixels(xximage->sizeX, xximage->sizeY, GL_RGB, GL_UNSIGNED_BYTE, 
         xximage->data); 
 
    point[0] = (float)x; 
    point[1] = windH - (float)y; 
    point[2] = 0.0; 
    glRasterPos3fv(point); 
 
    glPixelZoom(zoom, zoom); 
    glCopyPixels((windW/2)-(xximage->sizeX/2), 
         (windH/2)-(xximage->sizeY/2), 
         xximage->sizeX, xximage->sizeY, GL_COLOR); 
 
    glFlush(); 
 
    if (doubleBuffer) { 
    auxSwapBuffers(); 
    } 
} 
 
static GLenum 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; 
    } else if (strcmp(argv[i], "-f") == 0) { 
        if (i+1 >= argc || argv[i+1][0] == '-') { 
        //printf("-f (No file name).\n"); 
        return GL_FALSE; 
        } else { 
        fileName = argv[++i]; 
        } 
    } 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(); 
    } 
 
    if (fileName == 0) { 
    //printf("No image file.\n"); 
    auxQuit(); 
    } 
 
    xximage = auxRGBImageLoad(fileName); 
 
    windW = 300; 
    windH = 300; 
    auxInitPosition(0, 0, windW, windH); 
 
    type = AUX_RGB; 
    type |= (doubleBuffer) ? AUX_DOUBLE : AUX_SINGLE; 
 
    auxInitDisplayMode(type); 
 
    if (auxInitWindow("Copy Test") == GL_FALSE) { 
    auxQuit(); 
    } 
 
    Init(); 
 
    auxExposeFunc((AUXEXPOSEPROC)Reshape); 
    auxReshapeFunc((AUXRESHAPEPROC)Reshape); 
    auxKeyFunc(AUX_Z, Key_Z); 
    auxKeyFunc(AUX_z, Key_z); 
    auxMouseFunc(AUX_LEFTBUTTON, AUX_MOUSEDOWN, Mouse_left); 
    auxMainLoop(Draw); 
}