initial commit!

libs/libgccvb/bgmap.h

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+#ifndef _LIBGCCVB_BGMAP_H
+#define _LIBGCCVB_BGMAP_H
+
+
+#include "types.h"
+#include "video.h"
+
+
+/***** BGMap Macros (For the lazy ;) *****/
+/*
+	These calculate the address of a BGMap cell from a segment #
+	and X, Y coordinates.  (Which range from 0 to 63)  Not very
+	efficient for games, but useful for pre-calculation, debugging,
+	or easier-to-read example code, I suppose...
+*/
+
+// Procedural
+/***************************/
+
+// Set a cell's char #.
+#define BGM_CSET(n,x,y,c)		BGMM[((n) << 12) + ((y) << 6) + (x)] = (BGMM[((n) << 12) + ((y) << 6) + (x)] & 0xF000) | (u16)(c)
+// Turns on horizontal flipping for a cell.
+#define BGM_HSET(n,x,y)			BGMM[((n) << 12) + ((y) << 6) + (x)] |= BGM_HFLIP
+// Turns off horizontal flipping for a cell.
+#define BGM_HCLEAR(n,x,y)		BGMM[((n) << 12) + ((y) << 6) + (x)] &= 0xDFFF
+// Turns on vertical flipping for a cell.
+#define BGM_VSET(n,x,y)			BGMM[((n) << 12) + ((y) << 6) + (x)] |= BGM_VFLIP
+// Turns off vertical flipping for a cell.
+#define BGM_VCLEAR(n,x,y)		BGMM[((n) << 12) + ((y) << 6) + (x)] &= 0xEFFF
+// Set the palette used by a cell.  Example: BGM_PALSET(0,1,2,BGM_PAL3);
+#define BGM_PALSET(n,x,y,p)		BGMM[((n) << 12) + ((y) << 6) + (x)] = (BGMM[((n) << 12) + ((y) << 6) + (x)] & 0x3FFF) | (u16)(p)
+
+
+// Expressional
+/***************************/
+
+// Return a cell's char #.
+#define	BGM_CGET(n,x,y)			(BGMM[((n) << 12) + ((y) << 6) + (x)] & (u16)0x7FF)
+// Return -1 if a cell is flipped horizontally; 0 if not.
+#define BGM_HGET(n,x,y)			((BGMM[((n) << 12) + ((y) << 6) + (x)] & (u16)BGM_HFLIP) == BGM_HFLIP ? -1 : 0)
+// Return -1 if a cell is flipped vertically; 0 if not.
+#define BGM_VGET(n,x,y)			((BGMM[((n) << 12) + ((y) << 6) + (x)] & (u16)BGM_VFLIP) == BGM_VFLIP ? -1 : 0)
+// Return a cell's palette.  Example: BGM_PALGET(BGM_PAL2);
+#define BGM_PALGET(n,x,y)		(BGMM[((n) << 12) + ((y) << 6) + (x)] & (u16)0xC000)
+
+/* BGMap Flags */
+/* OR these together with a Char # to build a BGMap Cell
+		-OR-
+   Compare the output of the BGM_?GET macros above.
+*/
+
+#define	BGM_PAL0	0x0000
+#define	BGM_PAL1	0x4000
+#define	BGM_PAL2	0x8000
+#define	BGM_PAL3	0xC000
+
+#define	BGM_HFLIP	0x2000
+#define	BGM_VFLIP	0x1000
+
+
+#endif