diff options
Diffstat (limited to 'progs/demos/paltex.c')
| -rw-r--r-- | progs/demos/paltex.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/progs/demos/paltex.c b/progs/demos/paltex.c new file mode 100644 index 0000000000..e33a8ee075 --- /dev/null +++ b/progs/demos/paltex.c @@ -0,0 +1,186 @@ +/* $Id: paltex.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */ + +/* + * Paletted texture demo. Written by Brian Paul. This file in public domain. + */ + +/* + * $Log: paltex.c,v $ + * Revision 1.1 1999/08/19 00:55:40 jtg + * Initial revision + * + * Revision 3.1 1999/03/28 18:20:49 brianp + * minor clean-up + * + * Revision 3.0 1998/02/14 18:42:29 brianp + * initial rev + * + */ + + +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/glut.h> + + +static float Rot = 0.0; + + +static void Idle( void ) +{ + Rot += 5.0; + glutPostRedisplay(); +} + + +static void Display( void ) +{ + glClear( GL_COLOR_BUFFER_BIT ); + + glPushMatrix(); + glRotatef(Rot, 0, 0, 1); + + glBegin(GL_POLYGON); + glTexCoord2f(0, 1); glVertex2f(-1, -1); + glTexCoord2f(1, 1); glVertex2f( 1, -1); + glTexCoord2f(1, 0); glVertex2f( 1, 1); + glTexCoord2f(0, 0); glVertex2f(-1, 1); + glEnd(); + + glPopMatrix(); + + glutSwapBuffers(); +} + + +static void Reshape( int width, int height ) +{ + glViewport( 0, 0, width, height ); + glMatrixMode( GL_PROJECTION ); + glLoadIdentity(); + glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 ); + glMatrixMode( GL_MODELVIEW ); + glLoadIdentity(); + glTranslatef( 0.0, 0.0, -15.0 ); +} + + +static void Key( unsigned char key, int x, int y ) +{ + (void) x; + (void) y; + switch (key) { + case 27: + exit(0); + break; + } + glutPostRedisplay(); +} + + +static void SpecialKey( int key, int x, int y ) +{ + (void) x; + (void) y; + switch (key) { + case GLUT_KEY_UP: + break; + case GLUT_KEY_DOWN: + break; + case GLUT_KEY_LEFT: + break; + case GLUT_KEY_RIGHT: + break; + } + glutPostRedisplay(); +} + + +static void Init( void ) +{ + GLubyte texture[8][8] = { /* PT = Paletted Texture! */ + { 0, 0, 0, 0, 0, 0, 0, 0}, + { 0, 100, 100, 100, 0, 180, 180, 180}, + { 0, 100, 0, 100, 0, 0, 180, 0}, + { 0, 100, 0, 100, 0, 0, 180, 0}, + { 0, 100, 100, 100, 0, 0, 180, 0}, + { 0, 100, 0, 0, 0, 0, 180, 0}, + { 0, 100, 0, 0, 0, 0, 180, 0}, + { 0, 100, 255, 0, 0, 0, 180, 250}, + }; + + GLubyte table[256][4]; + int i; + + if (!glutExtensionSupported("GL_EXT_paletted_texture")) { + printf("Sorry, GL_EXT_paletted_texture not supported\n"); + exit(0); + } + + /* put some wacky colors into the texture palette */ + for (i=0;i<256;i++) { + table[i][0] = i; + table[i][1] = 0; + table[i][2] = 127 + i / 2; + table[i][3] = 255; + } + +#ifdef GL_EXT_paletted_texture + +#if defined(GL_EXT_shared_texture_palette) && defined(SHARED_PALETTE) + printf("Using shared palette\n"); + glColorTableEXT(GL_SHARED_TEXTURE_PALETTE_EXT, /* target */ + GL_RGBA, /* internal format */ + 256, /* table size */ + GL_RGBA, /* table format */ + GL_UNSIGNED_BYTE, /* table type */ + table); /* the color table */ + glEnable(GL_SHARED_TEXTURE_PALETTE_EXT); +#else + glColorTableEXT(GL_TEXTURE_2D, /* target */ + GL_RGBA, /* internal format */ + 256, /* table size */ + GL_RGBA, /* table format */ + GL_UNSIGNED_BYTE, /* table type */ + table); /* the color table */ +#endif + + glTexImage2D(GL_TEXTURE_2D, /* target */ + 0, /* level */ + GL_COLOR_INDEX8_EXT, /* internal format */ + 8, 8, /* width, height */ + 0, /* border */ + GL_COLOR_INDEX, /* texture format */ + GL_UNSIGNED_BYTE, /* texture type */ + texture); /* teh texture */ +#endif + + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); + glEnable(GL_TEXTURE_2D); +} + + +int main( int argc, char *argv[] ) +{ + glutInit( &argc, argv ); + glutInitWindowPosition( 0, 0 ); + glutInitWindowSize( 400, 400 ); + + glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); + + glutCreateWindow(argv[0]); + + Init(); + + glutReshapeFunc( Reshape ); + glutKeyboardFunc( Key ); + glutSpecialFunc( SpecialKey ); + glutDisplayFunc( Display ); + glutIdleFunc( Idle ); + + glutMainLoop(); + return 0; +} |