librw/src/rwengine.h

namespace rw {

enum DeviceReq
{
	// Device/Context creation
	DEVICEOPEN,
	// Device/Context shutdown
	DEVICECLOSE,

	// Device initialization before Engine/Driver plugins are opened
	DEVICEINIT,
	// Device de-initialization after Engine/Driver plugins are closed
	DEVICETERM,

	// Device initialization after Engine/Driver plugins are opened
	DEVICEFINALIZE
	// TODO? counterpart to FINALIZE?
};

typedef int DeviceSystem(DeviceReq req, void *arg0);

struct Camera;
struct Image;
struct Texture;
struct Raster;
class ObjPipeline;

// This is for the render device, we only have one
struct Device
{
	float32 zNear, zFar;
	void  (*beginUpdate)(Camera*);
	void  (*endUpdate)(Camera*);
	void  (*clearCamera)(Camera*, RGBA *col, uint32 mode);
	void  (*showRaster)(Raster *raster);
	void  (*setRenderState)(int32 state, void *value);
	void *(*getRenderState)(int32 state);

	void   (*im2DRenderLine)(void*, int32, int32, int32);
	void   (*im2DRenderTriangle)(void*, int32, int32, int32, int32);
	void   (*im2DRenderPrimitive)(PrimitiveType,
	                                     void*, int32);
	void   (*im2DRenderIndexedPrimitive)(PrimitiveType,
	                                     void*, int32, void*, int32);

	// Not sure if this will stay...
	void (*im3DTransform)(void *vertices, int32 numVertices, Matrix *world);
	void (*im3DRenderIndexed)(PrimitiveType primType, void *indices, int32 numIndices);
	void (*im3DEnd)(void);

	DeviceSystem *system;
};

// This is for platform-dependent but portable things
// so the engine has one for every platform
struct Driver
{
	ObjPipeline *defaultPipeline;
	int32 rasterNativeOffset;

	void   (*rasterCreate)(Raster*);
	uint8 *(*rasterLock)(Raster*, int32 level, int32 lockMode);
	void   (*rasterUnlock)(Raster*, int32 level);
	uint8 *(*rasterLockPalette)(Raster*, int32 lockMode);
	void   (*rasterUnlockPalette)(Raster*);
	int32  (*rasterNumLevels)(Raster*);
	void   (*rasterFromImage)(Raster*, Image*);
	Image *(*rasterToImage)(Raster*);

	static PluginList s_plglist[NUM_PLATFORMS];
	static int32 registerPlugin(int32 platform, int32 size, uint32 id,
	                            Constructor ctor, Destructor dtor){
		return s_plglist[platform].registerPlugin(size, id,
		                                          ctor, dtor, nil);
	}
};

struct EngineStartParams;

enum MemHint
{
	MEMDUR_NA = 0,
	// used inside function
	MEMDUR_FUNCTION = 0x10000,
	// used for one frame
	MEMDUR_FRAME = 0x20000,
	// used for longer time
	MEMDUR_EVENT = 0x30000,
	// used while the engine is running
	MEMDUR_GLOBAL = 0x40000
};

struct MemoryFunctions
{
	void *(*rwmalloc)(size_t sz, uint32 hint);
	void *(*rwrealloc)(void *p, size_t sz, uint32 hint);
	void  (*rwfree)(void *p);
	// These are temporary until we have better error handling
	// TODO: Maybe don't put them here since they shouldn't really be switched out
	void *(*rwmustmalloc)(size_t sz, uint32 hint);
	void *(*rwmustrealloc)(void *p, size_t sz, uint32 hint);
};

// This is for platform independent things
// TODO: move more stuff into this
struct Engine
{
	enum State {
		Dead = 0,
		Initialized,
		Opened,
		Started
	};
	void *currentCamera;
	void *currentWorld;
	LinkList frameDirtyList;

	// Dynamically allocated because of plugins
	Driver *driver[NUM_PLATFORMS];
	Device device;

	// These must always be available
	static MemoryFunctions memfuncs;
	static State state;

	static bool32 init(void);
	static bool32 open(void);
	static bool32 start(EngineStartParams*);
	static void term(void);
	static void close(void);
	static void stop(void);

	static PluginList s_plglist;
	static int32 registerPlugin(int32 size, uint32 id,
	                            Constructor ctor, Destructor dtor){
		return s_plglist.registerPlugin(size, id, ctor, dtor, nil);
	}
};

extern Engine *engine;

// These must be macros because we might want to pass __FILE__ and __LINE__ later
#define rwMalloc(s, h) rw::Engine::memfuncs.rwmalloc(s,h)
#define rwMallocT(t, s, h) (t*)rw::Engine::memfuncs.rwmalloc((s)*sizeof(t),h)
#define rwRealloc(p, s, h) rw::Engine::memfuncs.rwrealloc(p,s,h)
#define rwReallocT(t, p, s, h) (t*)rw::Engine::memfuncs.rwrealloc(p,(s)*sizeof(t),h)
#define rwFree(p) rw::Engine::memfuncs.rwfree(p)
#define rwNew(s, h) rw::Engine::memfuncs.rwmustmalloc(s,h)
#define rwNewT(t, s, h) (t*)rw::Engine::memfuncs.rwmustmalloc((s)*sizeof(t),h)
#define rwResize(p, s, h) rw::Engine::memfuncs.rwmustrealloc(p,s,h)
#define rwResizeT(t, p, s, h) (t*)rw::Engine::memfuncs.rwmustrealloc(p,(s)*sizeof(t),h)

namespace null {
	void beginUpdate(Camera*);
	void endUpdate(Camera*);
	void clearCamera(Camera*, RGBA *col, uint32 mode);
	void showRaster(Raster*);

	void   setRenderState(int32 state, void *value);
	void  *getRenderState(int32 state);

	void   rasterCreate(Raster*);
	uint8 *rasterLock(Raster*, int32 level, int32 lockMode);
	void   rasterUnlock(Raster*, int32 level);
	uint8 *rasterLockPalette(Raster*, int32 lockMode);
	void   rasterUnlockPalette(Raster*);
	int32  rasterNumLevels(Raster*);
	void   rasterFromImage(Raster*, Image*);
	Image *rasterToImage(Raster*);

	void   im2DRenderLine(void*, int32, int32, int32);
	void   im2DRenderTriangle(void*, int32, int32, int32, int32);
	void   im2DRenderPrimitive(PrimitiveType, void*, int32);
	void   im2DRenderIndexedPrimitive(PrimitiveType,
	                                  void*, int32, void*, int32);

	void im3DTransform(void *vertices, int32 numVertices, Matrix *world);
	void im3DRenderIndexed(PrimitiveType primType, void *indices, int32 numIndices);
	void im3DEnd(void);

	int deviceSystem(DeviceReq req, void*);

	extern Device renderdevice;
}

}