-/* $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.
+ * Paletted texture demo. Written by Brian Paul.
+ * This program is in the 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 <string.h>
+#ifdef _WIN32
+#include <windows.h>
+#endif
+#include <GL/glew.h>
#include <GL/glut.h>
static float Rot = 0.0;
+static GLboolean Anim = 1;
static void Idle( void )
{
- Rot += 5.0;
+ float t = glutGet(GLUT_ELAPSED_TIME) * 0.001; /* in seconds */
+ Rot = t * 360 / 4; /* 1 rotation per 4 seconds */
glutPostRedisplay();
}
static void Display( void )
{
- glClear( GL_COLOR_BUFFER_BIT );
+ /* draw background gradient */
+ glDisable(GL_TEXTURE_2D);
+ glBegin(GL_POLYGON);
+ glColor3f(1.0, 0.0, 0.2); glVertex2f(-1.5, -1.0);
+ glColor3f(1.0, 0.0, 0.2); glVertex2f( 1.5, -1.0);
+ glColor3f(0.0, 0.0, 1.0); glVertex2f( 1.5, 1.0);
+ glColor3f(0.0, 0.0, 1.0); glVertex2f(-1.5, 1.0);
+ glEnd();
glPushMatrix();
glRotatef(Rot, 0, 0, 1);
+ glEnable(GL_TEXTURE_2D);
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);
+ glTexCoord2f(0, 1); glVertex2f(-1, -0.5);
+ glTexCoord2f(1, 1); glVertex2f( 1, -0.5);
+ glTexCoord2f(1, 0); glVertex2f( 1, 0.5);
+ glTexCoord2f(0, 0); glVertex2f(-1, 0.5);
glEnd();
glPopMatrix();
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
- glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
+ glOrtho( -1.5, 1.5, -1.0, 1.0, -1.0, 1.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
- glTranslatef( 0.0, 0.0, -15.0 );
}
case 27:
exit(0);
break;
+ case 's':
+ Rot += 0.5;
+ break;
+ case ' ':
+ Anim = !Anim;
+ if (Anim)
+ glutIdleFunc( Idle );
+ else
+ glutIdleFunc( NULL );
+ break;
}
glutPostRedisplay();
}
-static void SpecialKey( int key, int x, int y )
+static void Init( void )
{
- (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;
+#define HEIGHT 8
+#define WIDTH 32
+ /* 257 = HEIGHT * WIDTH + 1 (for trailing '\0') */
+ static char texture[257] = {"\
+ \
+ MMM EEEE SSS AAA \
+ M M M E S S A A \
+ M M M EEEE SS A A \
+ M M M E SS AAAAA \
+ M M E S S A A \
+ M M EEEE SSS A A \
+ "
+ };
+ GLubyte table[256][4];
+
+ if (!glutExtensionSupported("GL_EXT_paletted_texture")) {
+ printf("Sorry, GL_EXT_paletted_texture not supported\n");
+ exit(0);
}
- glutPostRedisplay();
+
+ /* load the color table for each texel-index */
+ memset(table, 0, 256*4);
+ table[' '][0] = 255;
+ table[' '][1] = 255;
+ table[' '][2] = 255;
+ table[' '][3] = 64;
+ table['M'][0] = 255;
+ table['M'][1] = 0;
+ table['M'][2] = 0;
+ table['M'][3] = 255;
+ table['E'][0] = 0;
+ table['E'][1] = 255;
+ table['E'][2] = 0;
+ table['E'][3] = 255;
+ table['S'][0] = 0;
+ table['S'][1] = 0;
+ table['S'][2] = 255;
+ table['S'][3] = 255;
+ table['A'][0] = 255;
+ table['A'][1] = 255;
+ table['A'][2] = 0;
+ table['A'][3] = 255;
+
+#ifdef GL_EXT_paletted_texture
+
+#if defined(GL_EXT_shared_texture_palette) && defined(USE_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 */
+ WIDTH, HEIGHT, /* width, height */
+ 0, /* border */
+ GL_COLOR_INDEX, /* texture format */
+ GL_UNSIGNED_BYTE, /* texture type */
+ texture); /* the 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);
+
+ glEnable(GL_BLEND);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+#undef HEIGHT
+#undef WIDTH
}
-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},
- };
+/*
+ * Color ramp test
+ */
+static void Init2( void )
+{
+#define HEIGHT 32
+#define WIDTH 256
+ static char texture[HEIGHT][WIDTH];
GLubyte table[256][4];
- int i;
+ int i, j;
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++) {
+ for (j = 0; j < HEIGHT; j++) {
+ for (i = 0; i < WIDTH; i++) {
+ texture[j][i] = i;
+ }
+ }
+
+ for (i = 0; i < 255; i++) {
table[i][0] = i;
table[i][1] = 0;
- table[i][2] = 127 + i / 2;
+ table[i][2] = 0;
table[i][3] = 255;
}
#ifdef GL_EXT_paletted_texture
-#if defined(GL_EXT_shared_texture_palette) && defined(SHARED_PALETTE)
+#if defined(GL_EXT_shared_texture_palette) && defined(USE_SHARED_PALETTE)
printf("Using shared palette\n");
glColorTableEXT(GL_SHARED_TEXTURE_PALETTE_EXT, /* target */
GL_RGBA, /* internal format */
glTexImage2D(GL_TEXTURE_2D, /* target */
0, /* level */
GL_COLOR_INDEX8_EXT, /* internal format */
- 8, 8, /* width, height */
+ WIDTH, HEIGHT, /* width, height */
0, /* border */
GL_COLOR_INDEX, /* texture format */
GL_UNSIGNED_BYTE, /* texture type */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glEnable(GL_TEXTURE_2D);
+
+ glEnable(GL_BLEND);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
int main( int argc, char *argv[] )
{
+ glutInitWindowSize( 400, 300 );
glutInit( &argc, argv );
- glutInitWindowPosition( 0, 0 );
- glutInitWindowSize( 400, 400 );
-
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
-
glutCreateWindow(argv[0]);
+ glewInit();
Init();
+ (void) Init2; /* silence warning */
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
- glutSpecialFunc( SpecialKey );
glutDisplayFunc( Display );
- glutIdleFunc( Idle );
+ if (Anim)
+ glutIdleFunc( Idle );
glutMainLoop();
return 0;