diff options
Diffstat (limited to 'progs/demos/copypix.c')
| -rw-r--r-- | progs/demos/copypix.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/progs/demos/copypix.c b/progs/demos/copypix.c index 15001e851b..a13339ea62 100644 --- a/progs/demos/copypix.c +++ b/progs/demos/copypix.c @@ -6,11 +6,10 @@ */ -#define GL_GLEXT_PROTOTYPES - #include <stdio.h> #include <stdlib.h> #include <string.h> +#include <GL/glew.h> #include <GL/glut.h> #include "readtex.h" @@ -27,6 +26,7 @@ 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 ) @@ -60,6 +60,15 @@ static void Display( void ) 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); @@ -68,6 +77,15 @@ static void Display( void ) 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 @@ -106,6 +124,9 @@ static void Key( unsigned char key, int x, int y ) else glDisable(GL_DITHER); break; + case 'i': + Invert = !Invert; + break; case 's': Scissor = !Scissor; break; @@ -234,6 +255,7 @@ int main( int argc, char *argv[] ) glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE); glutCreateWindow(argv[0]); + glewInit(); Init(ciMode, filename); Usage(); |