-/* $Id: paltex.c,v 1.4 2000/06/27 17:12:10 brianp Exp $ */
/*
* Paletted texture demo. Written by Brian Paul.
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
-#define GL_GLEXT_LEGACY
+#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, -0.5);
glTexCoord2f(1, 1); glVertex2f( 1, -0.5);
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, -7.0 );
}
case 27:
exit(0);
break;
+ case 's':
+ Rot += 0.5;
+ break;
+ case ' ':
+ Anim = !Anim;
+ if (Anim)
+ glutIdleFunc( Idle );
+ else
+ glutIdleFunc( NULL );
+ break;
}
glutPostRedisplay();
}
{
#define HEIGHT 8
#define WIDTH 32
- static char texture[HEIGHT][WIDTH] = {
- " ",
- " 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 ",
- " "
+ /* 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];
}
/* load the color table for each texel-index */
- table[' '][0] = 50;
- table[' '][1] = 50;
- table[' '][2] = 50;
- table[' '][3] = 50;
+ 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] = 0;
+ table['M'][3] = 255;
table['E'][0] = 0;
table['E'][1] = 255;
table['E'][2] = 0;
- table['E'][3] = 0;
- table['S'][0] = 40;
- table['S'][1] = 40;
+ table['E'][3] = 255;
+ table['S'][0] = 0;
+ table['S'][1] = 0;
table['S'][2] = 255;
- table['S'][3] = 0;
+ table['S'][3] = 255;
table['A'][0] = 255;
table['A'][1] = 255;
table['A'][2] = 0;
- table['A'][3] = 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
+}
+
+
+
+/*
+ * Color ramp test
+ */
+static void Init2( void )
+{
+#define HEIGHT 32
+#define WIDTH 256
+ static char texture[HEIGHT][WIDTH];
+ GLubyte table[256][4];
+ int i, j;
+
+ if (!glutExtensionSupported("GL_EXT_paletted_texture")) {
+ printf("Sorry, GL_EXT_paletted_texture not supported\n");
+ exit(0);
+ }
+
+ 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] = 0;
+ table[i][3] = 255;
+ }
#ifdef GL_EXT_paletted_texture
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 );
glutDisplayFunc( Display );
- glutIdleFunc( Idle );
+ if (Anim)
+ glutIdleFunc( Idle );
glutMainLoop();
return 0;
projects / mesa.git / blobdiff