gbagpu.h

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/**************************************************************************
* DSemu - The Next Generation                                             *
* GBA scanline GPU: Class definition [gbagpu.h]                           *
* Copyright Imran Nazar, 2005; released under the BSD public licence.     *
**************************************************************************/

#include "defs.h"
#include "plggpu.h"
#include "plgmmu32.h"
#include "plggui.h"
#include "plgcpu.h"
#include "datadefs.h"

// An implementation of the GPU plugin interface.
class gbaGPU : public GPUPlugin
{
    public:
        gbaGPU(std::string, REQPTR, UNREQPTR);
	~gbaGPU();

        PLUGININFO *getinfo();
	void reset();
	void release();
	void status(int,int);
	
	void setDisplay(u8*);
	
    private:
        //---Plugin-generic stuff
        std::string pName, pClass;
        REQPTR pRequest;
        UNREQPTR pUnrequest;
	static PLUGININFO pInfo;
       
        static std::string pluginName;

	// Start of what we'll need.
	void line();
	void HBLstart();
	void HBLend();
	CPUPlugin *CPU;
	MMU32Plugin *MMU;

	static GUIPlugin *GUI;
	static int palwinID;
	static u32 *palbuffer;
	static u8 *dispbuffer;
        
	typedef struct {
            union {
                u16 data;
	        u8 b[2];
            };
            u16 flags;
        } IOREG;
			    
	static IOREG reg[0x30];
	static int rflags[0x30];

	static u8  *VRAMb, *OAMb;
	static u16 *VRAMh, *PALh, *OAMh;
	static u32 *VRAMw, *PALw, *OAMw;

	static int curline;
	
	static u8  rdB(u32);
	static u16 rdH(u32);
	static u32 rdW(u32);
	static void wrB(u32, u8 );
	static void wrH(u32, u16);
	static void wrW(u32, u32);

        static void scanTile(u8*,int), scanRot(u8*,int);
	static void sprites(u8*,int);
	
	static void hblank(Plugin*);
	static void hblankend(Plugin*);
	static void drawline(Plugin*);
	
	typedef void (*modefptr)(u8 *);
	static void lineM0(u8*), lineM1(u8*), lineM2(u8*);
	static void lineM3(u8*), lineM4(u8*), lineM5(u8*), lineMNULL(u8*);
	static modefptr lineM[8];

	static u32 BGX[2], BGY[2];
	static u8 mospy[4];
	static int ForceBG[4];
};

// I/O registers used by the GPU
#define REG_DISPCNT    0x000
#define REG_GREENSWAP  0x001
#define REG_DISPSTAT   0x002
#define REG_VCOUNT     0x003
#define REG_BG0CNT     0x004
#define REG_BG1CNT     0x005
#define REG_BG2CNT     0x006
#define REG_BG3CNT     0x007
#define REG_BG0HOFS    0x008
#define REG_BG0VOFS    0x009
#define REG_BG1HOFS    0x00A
#define REG_BG1VOFS    0x00B
#define REG_BG2HOFS    0x00C
#define REG_BG2VOFS    0x00D
#define REG_BG3HOFS    0x00E
#define REG_BG3VOFS    0x00F
#define REG_BG2PA      0x010
#define REG_BG2PB      0x011
#define REG_BG2PC      0x012
#define REG_BG2PD      0x013
#define REG_BG2XL      0x014
#define REG_BG2XH      0x015
#define REG_BG2YL      0x016
#define REG_BG2YH      0x017
#define REG_BG3PA      0x018
#define REG_BG3PB      0x019
#define REG_BG3PC      0x01A
#define REG_BG3PD      0x01B
#define REG_BG3XL      0x01C
#define REG_BG3XH      0x01D
#define REG_BG3YL      0x01E
#define REG_BG3YH      0x01F
#define REG_WIN0H      0x020
#define REG_WIN1H      0x021
#define REG_WIN0V      0x022
#define REG_WIN1V      0x023
#define REG_WININ      0x024
#define REG_WINOUT     0x025
#define REG_MOSAIC     0x026
#define REG_BLDCNT     0x028
#define REG_BLDALPHA   0x029
#define REG_BLDY       0x02A

/*** EOF: gbagpu.h *******************************************************/