+++ /dev/null
-/**
- * glCopyPixels test
- *
- * Brian Paul
- * 14 Sep 2007
- */
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-
-#include "readtex.h"
-
-#define IMAGE_FILE "../images/arch.rgb"
-
-static int ImgWidth, ImgHeight;
-static GLenum ImgFormat;
-static GLubyte *Image = NULL;
-
-static int WinWidth = 800, WinHeight = 800;
-static int Xpos, Ypos;
-static int Scissor = 0;
-static float Xzoom, Yzoom;
-static GLboolean DrawFront = GL_FALSE;
-static GLboolean Dither = GL_TRUE;
-static GLboolean Invert = GL_FALSE;
-
-
-static void Reset( void )
-{
- Xpos = Ypos = 20;
- Scissor = 0;
- Xzoom = Yzoom = 1.0;
-}
-
-
-static void Display( void )
-{
- const int dx = (WinWidth - ImgWidth) / 2;
- const int dy = (WinHeight - ImgHeight) / 2;
-
- if (DrawFront) {
- glDrawBuffer(GL_FRONT);
- glReadBuffer(GL_FRONT);
- }
- else {
- glDrawBuffer(GL_BACK);
- glReadBuffer(GL_BACK);
- }
-
- glClear( GL_COLOR_BUFFER_BIT );
-
- /* draw original image */
- glWindowPos2iARB(dx, dy);
- glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
-
- if (Scissor)
- glEnable(GL_SCISSOR_TEST);
-
- if (Invert) {
- glPixelTransferf(GL_RED_SCALE, -1.0);
- glPixelTransferf(GL_GREEN_SCALE, -1.0);
- glPixelTransferf(GL_BLUE_SCALE, -1.0);
- glPixelTransferf(GL_RED_BIAS, 1.0);
- glPixelTransferf(GL_GREEN_BIAS, 1.0);
- glPixelTransferf(GL_BLUE_BIAS, 1.0);
- }
-
- /* draw copy */
- glPixelZoom(Xzoom, Yzoom);
- glWindowPos2iARB(Xpos, Ypos);
- glCopyPixels(dx, dy, ImgWidth, ImgHeight, GL_COLOR);
- glPixelZoom(1, 1);
-
- glDisable(GL_SCISSOR_TEST);
-
- if (Invert) {
- glPixelTransferf(GL_RED_SCALE, 1.0);
- glPixelTransferf(GL_GREEN_SCALE, 1.0);
- glPixelTransferf(GL_BLUE_SCALE, 1.0);
- glPixelTransferf(GL_RED_BIAS, 0.0);
- glPixelTransferf(GL_GREEN_BIAS, 0.0);
- glPixelTransferf(GL_BLUE_BIAS, 0.0);
- }
-
- if (DrawFront)
- glFinish();
- else
- glutSwapBuffers();
-}
-
-
-static void Reshape( int width, int height )
-{
- WinWidth = width;
- WinHeight = height;
-
- glViewport( 0, 0, width, height );
- glMatrixMode( GL_PROJECTION );
- glLoadIdentity();
- glOrtho( 0.0, width, 0.0, height, 0.0, 2.0 );
- glMatrixMode( GL_MODELVIEW );
- glLoadIdentity();
-
- glScissor(width/4, height/4, width/2, height/2);
-}
-
-
-static void Key( unsigned char key, int x, int y )
-{
- (void) x;
- (void) y;
- switch (key) {
- case ' ':
- Reset();
- break;
- case 'd':
- Dither = !Dither;
- if (Dither)
- glEnable(GL_DITHER);
- else
- glDisable(GL_DITHER);
- break;
- case 'i':
- Invert = !Invert;
- break;
- case 's':
- Scissor = !Scissor;
- break;
- case 'x':
- Xzoom -= 0.1;
- break;
- case 'X':
- Xzoom += 0.1;
- break;
- case 'y':
- Yzoom -= 0.1;
- break;
- case 'Y':
- Yzoom += 0.1;
- break;
- case 'f':
- DrawFront = !DrawFront;
- printf("glDrawBuffer(%s)\n", DrawFront ? "GL_FRONT" : "GL_BACK");
- break;
- case 27:
- exit(0);
- break;
- }
- glutPostRedisplay();
-}
-
-
-static void SpecialKey( int key, int x, int y )
-{
- const int step = (glutGetModifiers() & GLUT_ACTIVE_SHIFT) ? 10 : 1;
- (void) x;
- (void) y;
- switch (key) {
- case GLUT_KEY_UP:
- Ypos += step;
- break;
- case GLUT_KEY_DOWN:
- Ypos -= step;
- break;
- case GLUT_KEY_LEFT:
- Xpos -= step;
- break;
- case GLUT_KEY_RIGHT:
- Xpos += step;
- break;
- }
- glutPostRedisplay();
-}
-
-
-static void Init( GLboolean ciMode, const char *filename )
-{
- printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
- printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
-
- Image = LoadRGBImage( filename, &ImgWidth, &ImgHeight, &ImgFormat );
- if (!Image) {
- printf("Couldn't read %s\n", filename);
- exit(0);
- }
-
- if (ciMode) {
- /* Convert RGB image to grayscale */
- GLubyte *indexImage = (GLubyte *) malloc( ImgWidth * ImgHeight );
- GLint i;
- for (i=0; i<ImgWidth*ImgHeight; i++) {
- int gray = Image[i*3] + Image[i*3+1] + Image[i*3+2];
- indexImage[i] = gray / 3;
- }
- free(Image);
- Image = indexImage;
- ImgFormat = GL_COLOR_INDEX;
-
- for (i=0;i<255;i++) {
- float g = i / 255.0;
- glutSetColor(i, g, g, g);
- }
- }
-
- printf("Loaded %d by %d image\n", ImgWidth, ImgHeight );
-
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- glPixelStorei(GL_UNPACK_ROW_LENGTH, ImgWidth);
-
- Reset();
-}
-
-
-static void Usage(void)
-{
- printf("Keys:\n");
- printf(" SPACE Reset Parameters\n");
- printf(" Up/Down Move image up/down (SHIFT for large step)\n");
- printf(" Left/Right Move image left/right (SHIFT for large step)\n");
- printf(" x Decrease X-axis PixelZoom\n");
- printf(" X Increase X-axis PixelZoom\n");
- printf(" y Decrease Y-axis PixelZoom\n");
- printf(" Y Increase Y-axis PixelZoom\n");
- printf(" s Toggle GL_SCISSOR_TEST\n");
- printf(" f Toggle front/back buffer drawing\n");
- printf(" ESC Exit\n");
-}
-
-
-int main( int argc, char *argv[] )
-{
- GLboolean ciMode = GL_FALSE;
- const char *filename = IMAGE_FILE;
- int i = 1;
-
- glutInitWindowSize( WinWidth, WinHeight );
- glutInit( &argc, argv );
-
- if (argc > i && strcmp(argv[i], "-ci")==0) {
- ciMode = GL_TRUE;
- i++;
- }
- if (argc > i) {
- filename = argv[i];
- }
-
- if (ciMode)
- glutInitDisplayMode( GLUT_INDEX | GLUT_DOUBLE );
- else
- glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE);
-
- glutCreateWindow(argv[0]);
- glewInit();
-
- Init(ciMode, filename);
- Usage();
-
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutSpecialFunc( SpecialKey );
- glutDisplayFunc( Display );
-
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff