119 lines
2.3 KiB
C
119 lines
2.3 KiB
C
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/*
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* Example of how to use the GL_MESA_window_pos extension.
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* Brian Paul This file is in the public domain.
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*/
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#include <math.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#define GL_GLEXT_PROTOTYPES
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#include "GL/glut.h"
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#include "readtex.c" /* a hack, I know */
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#define IMAGE_FILE "../images/girl.rgb"
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#ifndef M_PI
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# define M_PI 3.14159265
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#endif
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static GLubyte *Image;
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static int ImgWidth, ImgHeight;
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static GLenum ImgFormat;
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typedef void (APIENTRY * PFNWINDOWPOSFUNC)(GLfloat x, GLfloat y);
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static PFNWINDOWPOSFUNC WindowPosFunc;
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static void draw( void )
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{
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GLfloat angle;
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glClear( GL_COLOR_BUFFER_BIT );
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for (angle = -45.0; angle <= 135.0; angle += 10.0) {
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GLfloat x = 50.0 + 200.0 * cos( angle * M_PI / 180.0 );
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GLfloat y = 50.0 + 200.0 * sin( angle * M_PI / 180.0 );
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/* Don't need to worry about the modelview or projection matrices!!! */
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(*WindowPosFunc)( x, y );
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glDrawPixels( ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image );
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}
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glFinish();
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}
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static void key( unsigned char key, int x, int y )
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{
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(void) x;
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(void) y;
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switch (key) {
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case 27:
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exit(0);
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}
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}
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/* new window size or exposure */
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static void reshape( int width, int height )
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{
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glViewport(0, 0, (GLint)width, (GLint)height);
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}
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static void init( void )
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{
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#ifdef GL_ARB_window_pos
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if (glutExtensionSupported("GL_ARB_window_pos")) {
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printf("Using GL_ARB_window_pos\n");
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WindowPosFunc = &glWindowPos2fARB;
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}
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else
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#elif defined(GL_ARB_window_pos)
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if (glutExtensionSupported("GL_MESA_window_pos")) {
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printf("Using GL_MESA_window_pos\n");
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WindowPosFunc = &glWindowPos2fMESA;
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}
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else
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#endif
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{
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printf("Sorry, GL_ARB/MESA_window_pos extension not available.\n");
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exit(1);
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}
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Image = LoadRGBImage( IMAGE_FILE, &ImgWidth, &ImgHeight, &ImgFormat );
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if (!Image) {
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printf("Couldn't read %s\n", IMAGE_FILE);
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exit(0);
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}
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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}
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int main( int argc, char *argv[] )
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{
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glutInitWindowPosition(0, 0);
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glutInitWindowSize(500, 500);
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glutInitDisplayMode( GLUT_RGB );
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if (glutCreateWindow("winpos") <= 0) {
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exit(0);
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}
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init();
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glutReshapeFunc( reshape );
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glutKeyboardFunc( key );
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glutDisplayFunc( draw );
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glutMainLoop();
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return 0;
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}
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