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authorBrian Paul <brian.paul@tungstengraphics.com>2000-10-04 18:15:39 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2000-10-04 18:15:39 +0000
commit476609c539103c7981c972f24d4eaea499894050 (patch)
tree794eaa248d6f6accb1f44dba7ad72b7d43383539 /progs/demos
parent16eb23a0cb0edfede3968c0e938f533b9abe885c (diff)
improved to test alpha blending with texture palette
Diffstat (limited to 'progs/demos')
-rw-r--r--progs/demos/paltex.c130
1 files changed, 113 insertions, 17 deletions
diff --git a/progs/demos/paltex.c b/progs/demos/paltex.c
index aaafc6fabf..71c2fedf81 100644
--- a/progs/demos/paltex.c
+++ b/progs/demos/paltex.c
@@ -1,4 +1,4 @@
-/* $Id: paltex.c,v 1.4 2000/06/27 17:12:10 brianp Exp $ */
+/* $Id: paltex.c,v 1.5 2000/10/04 18:15:39 brianp Exp $ */
/*
* Paletted texture demo. Written by Brian Paul.
@@ -13,22 +13,32 @@
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);
@@ -47,10 +57,9 @@ 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 );
+ glOrtho( -1.5, 1.5, -1.0, 1.0, -1.0, 1.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
- glTranslatef( 0.0, 0.0, -7.0 );
}
@@ -62,6 +71,16 @@ static void Key( unsigned char key, int x, int y )
case 27:
exit(0);
break;
+ case 's':
+ Rot += 0.5;
+ break;
+ case ' ':
+ Anim = !Anim;
+ if (Anim)
+ glutIdleFunc( Idle );
+ else
+ glutIdleFunc( NULL );
+ break;
}
glutPostRedisplay();
}
@@ -89,26 +108,27 @@ static void Init( void )
}
/* 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
@@ -144,6 +164,81 @@ static void Init( void )
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 32
+#undef WIDTH 256
+}
+
+
+
+/*
+ * 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
+
+#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); /* 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);
+
+ glEnable(GL_BLEND);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
@@ -151,7 +246,7 @@ int main( int argc, char *argv[] )
{
glutInit( &argc, argv );
glutInitWindowPosition( 0, 0 );
- glutInitWindowSize( 400, 400 );
+ glutInitWindowSize( 400, 300 );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
@@ -162,7 +257,8 @@ int main( int argc, char *argv[] )
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutDisplayFunc( Display );
- glutIdleFunc( Idle );
+ if (Anim)
+ glutIdleFunc( Idle );
glutMainLoop();
return 0;