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added copypix.c test (test glCopyPixels w/ pixel zoom)
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Brian
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032707eeca
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2 changed files with 253 additions and 0 deletions
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@ -19,6 +19,7 @@ PROGS = \
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arbocclude \
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bounce \
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clearspd \
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copypix \
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cubemap \
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drawpix \
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engine \
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@ -153,6 +154,10 @@ fslight.o: fslight.c extfuncs.h
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viewdds: viewdds.c
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$(CC) -I$(INCDIR) $(CFLAGS) $< readtex.o $(APP_LIB_DEPS) -L. -lgltc -o $@
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clean:
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-rm -f $(PROGS)
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-rm -f *.o *~
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248
progs/demos/copypix.c
Normal file
248
progs/demos/copypix.c
Normal file
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@ -0,0 +1,248 @@
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/**
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* glCopyPixels test
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*
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* Brian Paul
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* 14 Sep 2007
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*/
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#define GL_GLEXT_PROTOTYPES
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <GL/glut.h>
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#include "readtex.h"
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#define IMAGE_FILE "../images/arch.rgb"
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static int ImgWidth, ImgHeight;
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static GLenum ImgFormat;
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static GLubyte *Image = NULL;
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static int WinWidth = 800, WinHeight = 800;
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static int Xpos, Ypos;
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static int Scissor = 0;
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static float Xzoom, Yzoom;
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static GLboolean DrawFront = GL_FALSE;
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static GLboolean Dither = GL_TRUE;
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static void Reset( void )
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{
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Xpos = Ypos = 20;
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Scissor = 0;
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Xzoom = Yzoom = 1.0;
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}
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static void Display( void )
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{
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const int dx = (WinWidth - ImgWidth) / 2;
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const int dy = (WinHeight - ImgHeight) / 2;
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if (DrawFront) {
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glDrawBuffer(GL_FRONT);
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glReadBuffer(GL_FRONT);
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}
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else {
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glDrawBuffer(GL_BACK);
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glReadBuffer(GL_BACK);
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}
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glClear( GL_COLOR_BUFFER_BIT );
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/* draw original image */
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glWindowPos2iARB(dx, dy);
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glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
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if (Scissor)
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glEnable(GL_SCISSOR_TEST);
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/* draw copy */
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glPixelZoom(Xzoom, Yzoom);
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glWindowPos2iARB(Xpos, Ypos);
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glCopyPixels(dx, dy, ImgWidth, ImgHeight, GL_COLOR);
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glPixelZoom(1, 1);
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glDisable(GL_SCISSOR_TEST);
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if (DrawFront)
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glFinish();
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else
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glutSwapBuffers();
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}
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static void Reshape( int width, int height )
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{
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WinWidth = width;
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WinHeight = height;
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glOrtho( 0.0, width, 0.0, height, 0.0, 2.0 );
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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glScissor(width/4, height/4, width/2, height/2);
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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 ' ':
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Reset();
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break;
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case 'd':
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Dither = !Dither;
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if (Dither)
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glEnable(GL_DITHER);
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else
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glDisable(GL_DITHER);
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break;
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case 's':
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Scissor = !Scissor;
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break;
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case 'x':
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Xzoom -= 0.1;
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break;
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case 'X':
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Xzoom += 0.1;
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break;
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case 'y':
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Yzoom -= 0.1;
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break;
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case 'Y':
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Yzoom += 0.1;
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break;
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case 'f':
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DrawFront = !DrawFront;
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printf("glDrawBuffer(%s)\n", DrawFront ? "GL_FRONT" : "GL_BACK");
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break;
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case 27:
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exit(0);
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break;
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}
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glutPostRedisplay();
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}
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static void SpecialKey( int key, int x, int y )
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{
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const int step = (glutGetModifiers() & GLUT_ACTIVE_SHIFT) ? 10 : 1;
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(void) x;
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(void) y;
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switch (key) {
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case GLUT_KEY_UP:
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Ypos += step;
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break;
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case GLUT_KEY_DOWN:
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Ypos -= step;
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break;
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case GLUT_KEY_LEFT:
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Xpos -= step;
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break;
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case GLUT_KEY_RIGHT:
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Xpos += step;
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break;
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}
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glutPostRedisplay();
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}
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static void Init( GLboolean ciMode, const char *filename )
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{
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printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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Image = LoadRGBImage( filename, &ImgWidth, &ImgHeight, &ImgFormat );
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if (!Image) {
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printf("Couldn't read %s\n", filename);
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exit(0);
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}
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if (ciMode) {
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/* Convert RGB image to grayscale */
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GLubyte *indexImage = (GLubyte *) malloc( ImgWidth * ImgHeight );
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GLint i;
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for (i=0; i<ImgWidth*ImgHeight; i++) {
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int gray = Image[i*3] + Image[i*3+1] + Image[i*3+2];
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indexImage[i] = gray / 3;
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}
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free(Image);
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Image = indexImage;
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ImgFormat = GL_COLOR_INDEX;
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for (i=0;i<255;i++) {
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float g = i / 255.0;
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glutSetColor(i, g, g, g);
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}
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}
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printf("Loaded %d by %d image\n", ImgWidth, ImgHeight );
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glPixelStorei(GL_UNPACK_ROW_LENGTH, ImgWidth);
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Reset();
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}
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static void Usage(void)
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{
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printf("Keys:\n");
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printf(" SPACE Reset Parameters\n");
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printf(" Up/Down Move image up/down (SHIFT for large step)\n");
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printf(" Left/Right Move image left/right (SHIFT for large step)\n");
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printf(" x Decrease X-axis PixelZoom\n");
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printf(" X Increase X-axis PixelZoom\n");
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printf(" y Decrease Y-axis PixelZoom\n");
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printf(" Y Increase Y-axis PixelZoom\n");
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printf(" s Toggle GL_SCISSOR_TEST\n");
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printf(" f Toggle front/back buffer drawing\n");
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printf(" ESC Exit\n");
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}
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int main( int argc, char *argv[] )
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{
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GLboolean ciMode = GL_FALSE;
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const char *filename = IMAGE_FILE;
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int i = 1;
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if (argc > i && strcmp(argv[i], "-ci")==0) {
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ciMode = GL_TRUE;
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i++;
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}
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if (argc > i) {
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filename = argv[i];
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}
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glutInit( &argc, argv );
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glutInitWindowPosition( 0, 0 );
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glutInitWindowSize( WinWidth, WinHeight );
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if (ciMode)
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glutInitDisplayMode( GLUT_INDEX | GLUT_DOUBLE );
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else
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE);
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glutCreateWindow(argv[0]);
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Init(ciMode, filename);
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Usage();
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glutReshapeFunc( Reshape );
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glutKeyboardFunc( Key );
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glutSpecialFunc( SpecialKey );
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glutDisplayFunc( Display );
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glutMainLoop();
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return 0;
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}
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