/* ********************************************************************
 
 GTE is copyright Lucas Scharenbroich and licensed under the Apache-2.0
 License.

 The following GTE function definitions are taken from the GTE Toolbox
 documentation:
 https://lscharen.github.io/iigs-game-engine/toolboxref.html
 
 And from the GTE Macros:
 https://github.com/lscharen/iigs-game-engine/blob/d7be9f1be44748b0180c930b1f90b144cda661ea/macros/GTE.Macs.s
 
 The contents of this file are a derivite work from GTE intended to
 ease the process of calling GTE / Tool 160 from ORCA/C and are believed
 to be permitted under the terms of the Apache-2.0 License.

 ********************************************************************* */

#ifndef _GTE_HEADER_INCLUDE_
#define _GTE_HEADER_INCLUDE_


/* GTE Housekeeping Routines */
extern pascal void GTEBootInit(void) inline(0x01A0, dispatcher);
extern pascal void GTEStartUp(Word dPageAddr, Word capFlags, Word userID) inline(0x02A0, dispatcher);
extern pascal void GTEShutDown(void) inline(0x03A0, dispatcher);
extern pascal Word GTEVersion(void) inline(0x04A0, dispatcher);
extern pascal void GTEReset(void) inline(0x05A0, dispatcher);
extern pascal Word GTEStatus(void) inline(0x06A0, dispatcher);


/* GTE Sprite Routines */
extern pascal void GTECreateSpriteStamp(Word spriteDescriptor, Word vBuffAddr) inline(0x0FA0, dispatcher);
extern pascal void GTEAddSprite(Word spriteSlot, Word spriteFlags, Word vBuffAddr, Word x, Word y) inline(0x10A0, dispatcher);
extern pascal void GTEMoveSprite(Word spriteSlot, Word x, Word y) inline(0x11A0, dispatcher);
extern pascal void GTEUpdateSprite(Word spriteSlot, Word spriteFlags, Word vBuffAddr) inline(0x12A0, dispatcher);
extern pascal void GTERemoveSprite(Word spriteSlot) inline(0x13A0, dispatcher);


/* GTE Tile Routines */
extern pascal void GTELoadTileSet(Pointer tileSetPtr) inline(0x0EA0, dispatcher);
extern pascal void GTEFillTileStore(Word tileID) inline(0x25A0, dispatcher);


/* GTE Primary Background Routines */
extern pascal void GTESetBG0Origin(Word x, Word y) inline(0x0CA0, dispatcher);
extern pascal void GTERender(Word flags) inline(0x0DA0, dispatcher);


/* GTE Global State Functions */
extern pascal void GTESetScreenMode(Word width, Word height) inline(0x0AA0, dispatcher);
extern pascal void GTESetPalette(Word palNum, Pointer palettePtr) inline(0x16A0, dispatcher);


/* GTE Misc. Functions */
extern pascal Word GTEReadControl(void) inline(0x09A0, dispatcher);
extern pascal Word GTEGetSeconds(void) inline(0x14A0, dispatcher);


/* GTE Sprite Constants */
#define GTE_SPRITE_HIDE            0x2000
#define GTE_SPRITE_16X16           0x1800
#define GTE_SPRITE_16X8            0x1000
#define GTE_SPRITE_8X16            0x0800
#define GTE_SPRITE_8X8             0x0000
#define GTE_SPRITE_VFLIP           0x0400
#define GTE_SPRITE_HFLIP           0x0200


/* GTE Sprint Stamp Storage Parameters */
#define GTE_VBUFF_STRIDE_BYTES     (12 * 4)                            /* Each line has 4 slots of 16 pixels + 8 buffer pixels */
#define GTE_VBUFF_TILE_ROW_BYTES   (8 * GTE_VBUFF_STRIDE_BYTES)        /* Each row is comprised of 8 lines */
#define GTE_VBUFF_TILE_COL_BYTES   (4)
#define GTE_VBUFF_SPRITE_STEP      (GTE_VBUFF_TILE_ROW_BYTES*3)        /* Allocate space for 16 rows + 8 rows of buffer */
#define GTE_VBUFF_SPRITE_START     (GTE_VBUFF_TILE_ROW_BYTES+4)        /* Start at an offset so $0000 can be used as an empty value */
#define GTE_VBUFF_SLOT_COUNT       (48)                                /* Have space for this many stamps */


#endif /* _GTE_HEADER_INCLUDE_ */