dsgpu.cpp

一个任天堂掌上游戏机NDS的源代码

/**************************************************************************
* DSemu - The Next Generation                                             *
* Null GPU plugin: Implementation [nullgpu.cpp]                           *
* Copyright Imran Nazar, 2005; released under the BSD public licence.     *
**************************************************************************/

#include <string>
#include "events.h"
#include "defs.h"
#include "dsgpu.h"
#include "log.h"

//---Static private class members------------------------------------------
// Every plugin has an INFO structure attached, with info about the plugin.

PLUGININFO dsGPU::pInfo={
    PLUGIN_TYPE_GPU,
    0x00010001,
    "DS graphics plugin",
    "DSemu-ng"
};

GUIPlugin *dsGPU::GUI;
std::string dsGPU::pluginName;

u8*  dsGPU::VRAMb[9];
u16* dsGPU::VRAMh[9];
u32* dsGPU::VRAMw[9];

u8 *dsGPU::PALb; u16 *dsGPU::PALh; u32 *dsGPU::PALw;
u8 *dsGPU::OAMb; u16 *dsGPU::OAMh; u32 *dsGPU::OAMw;

u8 *dsGPU::dispbuffer;
CPUPlugin *dsGPU::CPU;
MMU32Plugin *dsGPU::MMU, *dsGPU::MMUsub;

const int dsGPU::VRAMsizes[9]={128,128,128,128,64,16,16,32,16};
std::map<u32,dsGPU::VRAMPTR> dsGPU::bankptrs;
dsGPU::IOREG dsGPU::bankio[5];
const u32 dsGPU::bankaddrs[9][32]={
    {0x06800000, 0x06000000, 0x06400000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06020000, 0x06420000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06040000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06060000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000},
    {0x06820000, 0x06000000, 0x06400000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06020000, 0x06420000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06040000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06060000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000},
    {0x06840000, 0x06000000, 0x16000000, 0x00000000, 0x06200000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06020000, 0x16020000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06040000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06060000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000},
    {0x06860000, 0x06000000, 0x16000000, 0x00000000, 0x06600000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06020000, 0x16020000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06040000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06060000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000},
    {0x06880000, 0x06000000, 0x06400000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000},
    {0x06890000, 0x06000000, 0x06400000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06004000, 0x06404000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06010000, 0x06410000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06014000, 0x06414000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000},
    {0x06894000, 0x06000000, 0x06400000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06004000, 0x06404000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06010000, 0x06410000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x06014000, 0x06414000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000},
    {0x06898000, 0x06200000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000},
    {0x068A0000, 0x06208000, 0x06600000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000},
};

void dsGPU::drawline(Plugin *in) { ((dsGPU*)in)->line(); }
void dsGPU::line()
{
    GUI->eventPush(1536, EVENT_HBLANK_START, (vfptr)drawline, this);
}

// Tell the GPU where it'll be rendering to
void dsGPU::setDisplay(u8 *buf)
{
    dispbuffer = buf;
}

// Initialise plugin: Allocate memories, register with MMU
dsGPU::dsGPU(std::string name, REQPTR req, UNREQPTR unreq)
{
    pName = std::string(name);
    pClass = pName.substr(0, pName.find(".")+1);
    pRequest = req;
    pUnrequest = unreq;

    pluginName = std::string(pName);

    GUI = (GUIPlugin*)pRequest("UI");
    CPU = (CPUPlugin*)pRequest("DS_CPU0.main");
    MMU = (MMU32Plugin*)pRequest("DS_CPU0.mmu");
    MMUsub = (MMU32Plugin*)pRequest("DS_CPU1.mmu");

    for(int i=0;i<9;i++)
    {
	VRAMb[i] = new u8[VRAMsizes[i]*1024];
	if(!VRAMb[i]) throw Exception(ERR_GPU_INIT, pName,
			              "VRAM allocation failed.");
        VRAMh[i] = (u16*)VRAMb[i];
	VRAMw[i] = (u32*)VRAMb[i];
    }
    
    PALb=new u8[2048]; OAMb=new u8[2048];
    PALh=(u16*)PALb; PALw=(u32*)PALb;
    OAMh=(u16*)OAMb; OAMw=(u32*)OAMb;
    
    if(!PALb || !OAMb)
        throw Exception(ERR_GPU_INIT, pName,
                        "Allocation of VRAMs failed.");
    
    for(int i=0; i<16; i++)
    {
        MMU->rangeReg(0x50+i, rdB, rdH, rdW, wrB, wrH, wrW);
        MMU->rangeReg(0x60+i, rdB, rdH, rdW, wrB, wrH, wrW);
        MMU->rangeReg(0x70+i, rdB, rdH, rdW, wrB, wrH, wrW);
    }
    
    for(int i=0;i<5;i++)
    {
	bankio[i].data = 0;
	bankio[i].flags = 3;
    }
    MMU->mmioReg(0x24, rdB, rdH, rdW, wrB, wrH, wrW);
    
    Logger::log(pName) << "Initialised.";
}

// Shut down plugin: Free up memories
dsGPU::~dsGPU()
{
    for(int i=0;i<9;i++)
    {
	if(VRAMb[i]) { delete VRAMb[i]; VRAMb[i]=NULL; VRAMh[i]=NULL; VRAMw[i]=NULL; }
    }
    if(PALb) { delete PALb;  PALb=NULL; PALh=NULL; PALw=NULL; }
    if(OAMb) { delete OAMb;  OAMb=NULL; OAMh=NULL; OAMw=NULL; }
	
    pUnrequest("DS_CPU0.main", 1); CPU = NULL;
    pUnrequest("DS_CPU0.mmu", 1); MMU = NULL;
    pUnrequest("DS_CPU1.mmu", 1); MMUsub = NULL;
    pUnrequest("UI", 0); GUI = NULL;
    
    Logger::log(pName) << "Shutdown.";
}

// Reset plugin: Clear memories, read config file
void dsGPU::reset()
{
    for(int i=0;i<9;i++)
	memset(VRAMb[i], 0, VRAMsizes[i]*1024);
    memset(PALb, 0, 2048);
    memset(OAMb, 0, 2048);
	
    // First scanline call: In a thousand cycles, come back and draw a line
    GUI->eventPush(1536, EVENT_HBLANK_START, (vfptr)drawline, this);
    
    Logger::log(pName) << "Reset";
}

// Provide status: Fill palette-window framebuffer
void dsGPU::status(int opt1=0, int opt2=0)
{
}

u8 dsGPU::rdB(u32 a)
{
    switch(a&0x0F000000)
    {
	case 0x06000000:
	    if(bankptrs.find(a&0xFFFFC000) != bankptrs.end())
                return bankptrs[a&0xFFFFC000].b[a&0x3FFF];
	    break;
    }
    return 0xFF;
}

u16 dsGPU::rdH(u32 a)
{
    switch(a&0x0F000000)
    {
	case 0x06000000:
	    if(bankptrs.find(a&0xFFFFC000) != bankptrs.end())
                return bankptrs[a&0xFFFFC000].h[(a&0x3FFF)>>1];
	    break;
    }
    return 0xFFFF;
}

u32 dsGPU::rdW(u32 a)
{
    switch(a&0x0F000000)
    {
	case 0x06000000:
	    if(bankptrs.find(a&0xFFFFC000) != bankptrs.end())
                return bankptrs[a&0xFFFFC000].w[(a&0x3FFF)>>2];
	    break;
    }
    return 0xFFFFFFFF;
}

void dsGPU::wrB(u32 a, u8 d)
{
    switch(a&0x0F000000)
    {
	case 0x04000000:
	    if((a&0x00000FF0)==0x240) bankChange(a&15, d);
	    break;
	case 0x06000000:
//	    printf("%08X=%02X\n", a, d);
	    if(bankptrs.find(a&0xFFFFC000) != bankptrs.end())
	    {
//                printf("Bank addr: %08X\n", bankptrs[a&0xFFFFC000].b);
                bankptrs[a&0xFFFFC000].b[a&0x3FFF]=d;
	    }
	    break;
    }
}

void dsGPU::wrH(u32 a, u16 d)
{
    switch(a&0x0F000000)
    {
	case 0x04000000:
	    if((a&0x00000FF0)==0x240)
	    {
		bankChange(a&14, d&255);
		bankChange((a&14)+1, d>>8);
	    }
	    break;
	case 0x06000000:
//	    printf("%08X=%04X\n", a, d);
	    if(bankptrs.find(a&0xFFFFC000) != bankptrs.end())
	    {
//                printf("Bank addr: %08X\n", bankptrs[a&0xFFFFC000].h);
                bankptrs[a&0xFFFFC000].h[(a&0x3FFF)>>1]=d;
	    }
	    break;
    }
}

void dsGPU::wrW(u32 a, u32 d)
{
    switch(a&0x0F000000)
    {
	case 0x04000000:
	    if((a&0x00000FF0)==0x240)
	    {
		bankChange(a&12, d&255);
		bankChange((a&12)+1, (d>>8)&255);
		bankChange((a&12)+2, (d>>16)&255);
		bankChange((a&12)+3, d>>24);
	    }
	    break;
	case 0x06000000:
//	    printf("%08X=%08X\n", a, d);
	    if(bankptrs.find(a&0xFFFFC000) != bankptrs.end())
	    {
//                printf("Bank addr: %08X\n", bankptrs[a&0xFFFFC000].w);
                bankptrs[a&0xFFFFC000].w[(a&0x3FFF)>>2]=d;
	    }
	    break;
    }
}

void dsGPU::bankChange(u8 bank, u8 val)
{
    if(bank>6) bank--;
/*    
    if(val & 0x80)
        printf("Bank #%d (%d KB) set to %02X (%08X)\n", bank, VRAMsizes[bank], val, bankaddrs[bank][val&0x1F]);
    else
	printf("Bank #%d (%d KB) off\n", bank, VRAMsizes[bank]);
*/    
    VRAMPTR ptr={NULL,NULL,NULL};
    for(int i=0; i<(VRAMsizes[bank]>>4); i++)
    {
	bankptrs[bankaddrs[bank][(bankio[bank>>1].b[bank&1])&0x1F]+(i<<14)]=ptr;
//	printf("%08X off\n", bankaddrs[bank][(bankio[bank>>1].b[bank&1])&0x1F]+(i<<14));
    }
    if(val&0x80)
    {
        for(int i=0; i<(VRAMsizes[bank]>>4); i++)
        {
	    ptr.b=VRAMb[bank]+(i<<14);
	    ptr.h=VRAMh[bank]+(i<<13);
	    ptr.w=VRAMw[bank]+(i<<12);
	    bankptrs[bankaddrs[bank][val&0x1F]+(i<<14)]=ptr;
/*	    
            printf("%08X to bank %d\n", bankaddrs[bank][val&0x1F]+(i<<14), bank);
	    printf("%08X, %08X, %08X\n",
	        bankptrs[bankaddrs[bank][val&0x1F]+(i<<14)].b,
	        bankptrs[bankaddrs[bank][val&0x1F]+(i<<14)].h,
	        bankptrs[bankaddrs[bank][val&0x1F]+(i<<14)].w);
*/	    
        }
    }
}

//---Plugin architecture support-------------------------------------------
// Retrieve Plugin class from outside
// Parameters: plg   - Address of a pointer to a Plugin class to 'new'
//             name  - FQPN of plugin as listed in INI file
//             req   - Pointer to PluginRequest API function
//             unreq - Pointer to PluginUnrequest API function
EXPORTFUNC void getPlugin(Plugin **plg,
                          std::string name,
                          REQPTR req, UNREQPTR unreq)
{
   *plg = new dsGPU(name, req, unreq);
}

// Provide plugin version information
PLUGININFO *dsGPU::getinfo()
{
    return &pInfo;
}

// Release plugin from outside
void dsGPU::release()
{
    // Delete the Test plugin that was 'new'd in getPlugin.
    delete this;
}

/*** EOF: nullgpu.cpp ****************************************************/