More 3-D texture hooks -- we might have GL_TEXTURE_3D instead of GL_TEXTURE_3D_EXT.

src/textures.c

@@ -84,15 +84,23 @@ int txbind( Texture *tx, int *enabled )
   int mustload;
   int wanted, wantenv;
 
-  if(tx == NULL || txload(tx) == 0) {
+  if(tx == NULL || txload(tx) == 0
+#ifndef GL_TEXTURE_3D
+	|| tx->flags & TXF_3D
+#endif
+		) {
     /* reset state, invalidate cache */
     if(enabled == NULL || *enabled != 0) {
 	glBindTexture( GL_TEXTURE_2D, 0 );
 	glDisable( GL_TEXTURE_2D );
+
+#ifdef GL_TEXTURE_3D
 	if(any3d) {
 	    glDisable( GL_TEXTURE_3D );
 	    glBindTexture( GL_TEXTURE_3D, 0 );
 	}
+#endif
+
 	glDisable( GL_ALPHA_TEST );
     }
     txenv = -1;
@@ -100,9 +108,14 @@ int txbind( Texture *tx, int *enabled )
     return 0;
   }
 
-  txtarget = (tx->flags & TXF_3D) ? GL_TEXTURE_3D : GL_TEXTURE_2D;
+#ifdef GL_TEXTURE_3D
+  txtarget = (tx->flags & TXF_3D) ? GL_TEXTURE_3D_EXT : GL_TEXTURE_2D;
 
-  if(txtarget == GL_TEXTURE_3D)
+#else
+  txtarget = GL_TEXTURE_2D;
+#endif
+
+  if(tx->flags & TXF_3D)
       any3d = 1;
 
   if(ctx < 0)
@@ -193,6 +206,7 @@ int txbind( Texture *tx, int *enabled )
 	    glPixelStorei( GL_PACK_ALIGNMENT, 1 );
 
 	if(tx->flags & TXF_3D) {
+#ifdef GL_TEXTURE_3D
 
 	    tx->qualflags &= ~TXQ_MIPMAP;
 	    glTexImage3D( GL_TEXTURE_3D, 0, channels,
@@ -202,6 +216,7 @@ int txbind( Texture *tx, int *enabled )
 			? GL_ALPHA : format[channels],
 		    GL_UNSIGNED_BYTE,
 		    txdata );
+#endif
 
 	} else {
 
@@ -260,7 +275,9 @@ int txbind( Texture *tx, int *enabled )
 	glEnable(txtarget);
     } else {
 	glDisable(GL_TEXTURE_2D);
+#ifdef GL_TEXTURE_3D
 	if(any3d) glDisable(GL_TEXTURE_3D);
+#endif
     }
     *enabled = wanted = tx->txid[ctx] | wantblend;
   }