[原创] 【试用心得】外传——《手把手教你移植InfoNES（到HANKER-LM4F232）》更新至20131030

sjtitr 2013-10-30 22:17 楼主

完结篇……更新至2013.10.30 - 22:17
温馨提示，本文中每个部分涉及到的工程包括源文件，都可以在本文的最后发现下载链接哟！

前三部分链接：https://bbs.eeworld.com.cn/thread-415692-1-1.html
第四部分上链接：https://bbs.eeworld.com.cn/thread-416564-1-1.html
第四部分下链接：https://bbs.eeworld.com.cn/thread-416756-1-1.html

有童鞋问了，神马是InfNES？这是一款NES游戏模拟器，也就是任天堂的红白机，80后的童年……InfoNES可以很容易地被移植到各个平台，可以说各大开发论坛上都可见它的身影。
如果你是有关技术的老鸟，那不好意思你可能什么都学不到了，更可能会发现本文的诸多错误，阅读本文只会让你更多地浪费生命，对此我十分抱歉。

好吧，节目继续。

第五部分是在目标程序可以运行的情况下，完善相关的接口，并进一步把之前移植造成的问题修复。
别忘了，之前我们写的接口还都是空函数，现在得动真格了。

好在程序已经可以下载并且调试了，之后的一切问题都可以通过调试来说话。
一切都从把示例程序的屏幕驱动移进来开始。尤其要注意包括示例的有关工程设置。
接下来呢，我们不能动态加载游戏ROM了，那么我就送给大家一个游戏ROM数组，加到工程里。具体内容各位到末尾的工程里获取吧。

当然了，读入ROM时也就不用文件名了，所以文件名参数pszFileName在本次移植之后，就没有用了，自己知道就好。
首先NesPalette是一个64个元素的调色盘数组，具体的颜色排布"翔"见下图。

参考win32工程里面的，发现源代码在此处有一定的奥秘，是关于前后景的，想一想马里奥大叔顶出问号中的蘑菇吧，是有遮挡关系的。

所以不得不承认，有一些地方需要调整，这里大家详见代码吧，我把这些解释为：NES只有64种颜色，原win32工程使用5:5:5表示RGB，我们更多时候可能要使用5:6:5，这样就用多余的一位来表示该颜色透明（即应该显示其后面被挡住的颜色），就这样吧，解释太多都是噩梦。
我的颜色表是：

WORD NesPalette[64]={
0x738E,0x88C4,0xA800,0x9808,0x7011,0x1015,0x0014,0x004F,
0x0148,0x0200,0x0280,0x11C0,0x59C3,0x0000,0x0000,0x0000,
0xBDD7,0xEB80,0xE9C4,0xF010,0xB817,0x581C,0x015B,0x0A59,
0x0391,0x0480,0x0540,0x3C80,0x8C00,0x0000,0x0000,0x0000,
0xFFDF,0xFDC7,0xFC8B,0xFC48,0xFBDE,0xB39F,0x639F,0x3CDF,
0x3DDE,0x1690,0x4EC9,0x9FCB,0xDF40,0x0000,0x0000,0x0000,
0xFFDF,0xFF15,0xFE98,0xFE5A,0xFE1F,0xDE1F,0xB5DF,0xAEDF,
0xA71F,0xA7DC,0xBF95,0xCFD6,0xF7D3,0x0000,0x0000,0x0000,
};

反正不是RGB，就是BGR啦，位数是5:6:5，如果觉得颜色有问题的话，自己调整一下R和B的顺序，G的6位只有高5位有效，低那一位表示是否透明，对于我们描画可以忽略这个值啦（最低位1或者0无所谓，不会影响这个颜色的整体颜色感觉）。
于是要在设置中配置透明标志：

#define TRANSPARENT_COLOR 0x0020

然后是InfoNES_ReadRom函数，用来把rom各种信息加载给模拟器核心。

/* Read ROM image file */
extern const BYTE nes_rom[];
int InfoNES_ReadRom( const char *pszFileName )
{
/*
* Read ROM image file
*
* Parameters
* const char *pszFileName (Read)
*
* Return values
* 0 : Normally
* -1 : Error
*/
/* Read ROM Header */
BYTE * rom = (BYTE*)nes_rom;
memcpy( &NesHeader, rom, sizeof(NesHeader));
if ( memcmp( NesHeader.byID, "NES\x1a", 4 ) != 0 )
{
/* not .nes file */
return -1;
}
rom += sizeof(NesHeader);
/* Clear SRAM */
memset( SRAM, 0, SRAM_SIZE );
/* If trainer presents Read Triner at 0x7000-0x71ff */
if ( NesHeader.byInfo1 & 4 )
{
//memcpy( &SRAM[ 0x1000 ], rom, 512);
rom += 512;
}
/* Allocate Memory for ROM Image */
ROM = rom;
rom += NesHeader.byRomSize * 0x4000;
if ( NesHeader.byVRomSize > 0 )
{
/* Allocate Memory for VROM Image */
VROM = (BYTE*)rom;
rom += NesHeader.byVRomSize * 0x2000;
}
/* Successful */
return 0;
}

InfoNES_LoadLine函数用来将一行256个像素点画在屏幕上。

/* Transfer the contents of work line on the screen */
void InfoNES_LoadLine()
{
int i;
for(i=0;i<256;i++)
{
GrContextForegroundSet(&sContext, WorkLine[i]);
GrPixelDraw(&sContext, i, PPU_Scanline);
}
}

还有两个内存处理函数：

/* memcpy */
void *InfoNES_MemoryCopy( void *dest, const void *src, int count ){return memcpy(dest,src,count);}
/* memset */
void *InfoNES_MemorySet( void *dest, int c, int count ){return memset(dest,c,count);}

事实上我的工程还增加了提高描画效率的处理和时间的有关处理，但是你要知道，只要上面这些内容搞对了，模拟器就可以疯跑啦。

前一部分还留了个坑，有两个函数从内部屏蔽了代码：InfoNES_DrawLine和InfoNES_GetSprHitY，请改成如下的样子。

/*===================================================================*/
/* */
/* InfoNES_DrawLine() : Render a scanline */
/* */
/*===================================================================*/
void InfoNES_DrawLine()
{
/*
* Render a scanline
*
*/
int nX;
int nY;
int nY4;
int nYBit;
WORD *pPalTbl;
BYTE *pAttrBase;
WORD *pPoint;
int nNameTable;
BYTE *pbyNameTable;
BYTE *pbyChrData;
#ifdef RAM_LACK
BYTE tileData[2] = {0, 0};
#else
int nIdx;
#endif /* RAM_LACK */
BYTE *pSPRRAM;
int nAttr;
int nSprCnt;
int nSprData;
BYTE bySprCol;
BYTE pSprBuf[ NES_DISP_WIDTH + 7 ];
/*-------------------------------------------------------------------*/
/* Render Background */
/*-------------------------------------------------------------------*/
/* MMC5 VROM switch */
MapperRenderScreen( 1 );
// Pointer to the render position
#if WORKFRAME_DEFINE == WORKFRAME_NONE
pPoint = WorkLine;
#else
pPoint = &WorkFrame[ PPU_Scanline * NES_DISP_WIDTH ];
#endif
// Clear a scanline if screen is off
if ( !( PPU_R1 & R1_SHOW_SCR ) )
{
InfoNES_MemorySet( pPoint, 0, NES_DISP_WIDTH << 1 );
}
else
{
nNameTable = PPU_NameTableBank;
nY = PPU_Scr_V_Byte + ( PPU_Scanline >> 3 );
nYBit = PPU_Scr_V_Bit + ( PPU_Scanline & 7 );
if ( nYBit > 7 )
{
++nY;
nYBit &= 7;
}
#ifndef RAM_LACK
nYBit <<= 3;
#endif /* !RAM_LACK */
if ( nY > 29 )
{
// Next NameTable (An up-down direction)
nNameTable ^= NAME_TABLE_V_MASK;
nY -= 30;
}
nX = PPU_Scr_H_Byte;
nY4 = ( ( nY & 2 ) << 1 );
/*-------------------------------------------------------------------*/
/* Rendering of the block of the left end */
/*-------------------------------------------------------------------*/
pbyNameTable = PPUBANK[ nNameTable ] + nY * 32 + nX;
#ifdef RAM_LACK
pbyChrData = PPU_BG_Base + ( *pbyNameTable << 4 ) + nYBit;
tileData[0] = ( ( pbyChrData[ 0 ] >> 1 ) & 0x55 ) | ( pbyChrData[ 8 ] & 0xAA );
tileData[1] = ( pbyChrData[ 0 ] & 0x55 ) | ( ( pbyChrData[ 8 ] << 1 ) & 0xAA );
#else
pbyChrData = PPU_BG_Base + ( *pbyNameTable << 6 ) + nYBit;
#endif /* RAM_LACK */
pAttrBase = PPUBANK[ nNameTable ] + 0x3c0 + ( nY / 4 ) * 8;
pPalTbl = &PalTable[ ( ( ( pAttrBase[ nX >> 2 ] >> ( ( nX & 2 ) + nY4 ) ) & 3 ) << 2 ) ];
#ifdef RAM_LACK
switch(PPU_Scr_H_Bit)
{
case 0:
*( pPoint++ ) = pPalTbl[ ( tileData[0] >> 6 ) & 3 ];
case 1:
*( pPoint++ ) = pPalTbl[ ( tileData[1] >> 6 ) & 3 ];
case 2:
*( pPoint++ ) = pPalTbl[ ( tileData[0] >> 4 ) & 3 ];
case 3:
*( pPoint++ ) = pPalTbl[ ( tileData[1] >> 4 ) & 3 ];
case 4:
*( pPoint++ ) = pPalTbl[ ( tileData[0] >> 2 ) & 3 ];
case 5:
*( pPoint++ ) = pPalTbl[ ( tileData[1] >> 2 ) & 3 ];
case 6:
*( pPoint++ ) = pPalTbl[ ( tileData[0] ) & 3 ];
case 7:
*( pPoint++ ) = pPalTbl[ ( tileData[1] ) & 3 ];
default:
break;
}
#else
for ( nIdx = PPU_Scr_H_Bit; nIdx < 8; ++nIdx )
{
*( pPoint++ ) = pPalTbl[ pbyChrData[ nIdx ] ];
}
#endif
// Callback at PPU read/write
MapperPPU( PATTBL( pbyChrData ) );
++nX;
++pbyNameTable;
/*-------------------------------------------------------------------*/
/* Rendering of the left table */
/*-------------------------------------------------------------------*/
for ( ; nX < 32; ++nX )
{
#ifdef RAM_LACK
pbyChrData = PPU_BG_Base + ( *pbyNameTable << 4 ) + nYBit;
tileData[0] = ( ( pbyChrData[ 0 ] >> 1 ) & 0x55 ) | ( pbyChrData[ 8 ] & 0xAA );
tileData[1] = ( pbyChrData[ 0 ] & 0x55 ) | ( ( pbyChrData[ 8 ] << 1 ) & 0xAA );
#else
pbyChrData = PPU_BG_Base + ( *pbyNameTable << 6 ) + nYBit;
#endif /* RAM_LACK */
pPalTbl = &PalTable[ ( ( ( pAttrBase[ nX >> 2 ] >> ( ( nX & 2 ) + nY4 ) ) & 3 ) << 2 ) ];
#ifdef RAM_LACK
pPoint[ 0 ] = pPalTbl[ ( tileData[0] >> 6 ) & 3 ];
pPoint[ 1 ] = pPalTbl[ ( tileData[1] >> 6 ) & 3 ];
pPoint[ 2 ] = pPalTbl[ ( tileData[0] >> 4 ) & 3 ];
pPoint[ 3 ] = pPalTbl[ ( tileData[1] >> 4 ) & 3 ];
pPoint[ 4 ] = pPalTbl[ ( tileData[0] >> 2 ) & 3 ];
pPoint[ 5 ] = pPalTbl[ ( tileData[1] >> 2 ) & 3 ];
pPoint[ 6 ] = pPalTbl[ ( tileData[0] ) & 3 ];
pPoint[ 7 ] = pPalTbl[ ( tileData[1] ) & 3 ];
#else
pPoint[ 0 ] = pPalTbl[ pbyChrData[ 0 ] ];
pPoint[ 1 ] = pPalTbl[ pbyChrData[ 1 ] ];
pPoint[ 2 ] = pPalTbl[ pbyChrData[ 2 ] ];
pPoint[ 3 ] = pPalTbl[ pbyChrData[ 3 ] ];
pPoint[ 4 ] = pPalTbl[ pbyChrData[ 4 ] ];
pPoint[ 5 ] = pPalTbl[ pbyChrData[ 5 ] ];
pPoint[ 6 ] = pPalTbl[ pbyChrData[ 6 ] ];
pPoint[ 7 ] = pPalTbl[ pbyChrData[ 7 ] ];
#endif
pPoint += 8;
// Callback at PPU read/write
MapperPPU( PATTBL( pbyChrData ) );
++pbyNameTable;
}
// Holizontal Mirror
nNameTable ^= NAME_TABLE_H_MASK;
pbyNameTable = PPUBANK[ nNameTable ] + nY * 32;
pAttrBase = PPUBANK[ nNameTable ] + 0x3c0 + ( nY / 4 ) * 8;
/*-------------------------------------------------------------------*/
/* Rendering of the right table */
/*-------------------------------------------------------------------*/
for ( nX = 0; nX < PPU_Scr_H_Byte; ++nX )
{
#ifdef RAM_LACK
pbyChrData = PPU_BG_Base + ( *pbyNameTable << 4 ) + nYBit;
tileData[0] = ( ( pbyChrData[ 0 ] >> 1 ) & 0x55 ) | ( pbyChrData[ 8 ] & 0xAA );
tileData[1] = ( pbyChrData[ 0 ] & 0x55 ) | ( ( pbyChrData[ 8 ] << 1 ) & 0xAA );
#else
pbyChrData = PPU_BG_Base + ( *pbyNameTable << 6 ) + nYBit;
#endif /* RAM_LACK */
pPalTbl = &PalTable[ ( ( ( pAttrBase[ nX >> 2 ] >> ( ( nX & 2 ) + nY4 ) ) & 3 ) << 2 ) ];
#ifdef RAM_LACK
pPoint[ 0 ] = pPalTbl[ ( tileData[0] >> 6 ) & 3 ];
pPoint[ 1 ] = pPalTbl[ ( tileData[1] >> 6 ) & 3 ];
pPoint[ 2 ] = pPalTbl[ ( tileData[0] >> 4 ) & 3 ];
pPoint[ 3 ] = pPalTbl[ ( tileData[1] >> 4 ) & 3 ];
pPoint[ 4 ] = pPalTbl[ ( tileData[0] >> 2 ) & 3 ];
pPoint[ 5 ] = pPalTbl[ ( tileData[1] >> 2 ) & 3 ];
pPoint[ 6 ] = pPalTbl[ ( tileData[0] ) & 3 ];
pPoint[ 7 ] = pPalTbl[ ( tileData[1] ) & 3 ];
#else
pPoint[ 0 ] = pPalTbl[ pbyChrData[ 0 ] ];
pPoint[ 1 ] = pPalTbl[ pbyChrData[ 1 ] ];
pPoint[ 2 ] = pPalTbl[ pbyChrData[ 2 ] ];
pPoint[ 3 ] = pPalTbl[ pbyChrData[ 3 ] ];
pPoint[ 4 ] = pPalTbl[ pbyChrData[ 4 ] ];
pPoint[ 5 ] = pPalTbl[ pbyChrData[ 5 ] ];
pPoint[ 6 ] = pPalTbl[ pbyChrData[ 6 ] ];
pPoint[ 7 ] = pPalTbl[ pbyChrData[ 7 ] ];
#endif
pPoint += 8;
// Callback at PPU read/write
MapperPPU( PATTBL( pbyChrData ) );
++pbyNameTable;
}
/*-------------------------------------------------------------------*/
/* Rendering of the block of the right end */
/*-------------------------------------------------------------------*/
#ifdef RAM_LACK
pbyChrData = PPU_BG_Base + ( *pbyNameTable << 4 ) + nYBit;
tileData[0] = ( ( pbyChrData[ 0 ] >> 1 ) & 0x55 ) | ( pbyChrData[ 8 ] & 0xAA );
tileData[1] = ( pbyChrData[ 0 ] & 0x55 ) | ( ( pbyChrData[ 8 ] << 1 ) & 0xAA );
#else
pbyChrData = PPU_BG_Base + ( *pbyNameTable << 6 ) + nYBit;
#endif /* RAM_LACK */
pPalTbl = &PalTable[ ( ( ( pAttrBase[ nX >> 2 ] >> ( ( nX & 2 ) + nY4 ) ) & 3 ) << 2 ) ];
#ifdef RAM_LACK
switch(PPU_Scr_H_Bit)
{
case 8:
pPoint[ 7 ] = pPalTbl[ ( tileData[1] ) & 3 ];
case 7:
pPoint[ 6 ] = pPalTbl[ ( tileData[0] ) & 3 ];
case 6:
pPoint[ 5 ] = pPalTbl[ ( tileData[1] >> 2 ) & 3 ];
case 5:
pPoint[ 4 ] = pPalTbl[ ( tileData[0] >> 2 ) & 3 ];
case 4:
pPoint[ 3 ] = pPalTbl[ ( tileData[1] >> 4 ) & 3 ];
case 3:
pPoint[ 2 ] = pPalTbl[ ( tileData[0] >> 4 ) & 3 ];
case 2:
pPoint[ 1 ] = pPalTbl[ ( tileData[1] >> 6 ) & 3 ];
case 1:
pPoint[ 0 ] = pPalTbl[ ( tileData[0] >> 6 ) & 3 ];
case 0:
default:
break;
}
#else
for ( nIdx = 0; nIdx < PPU_Scr_H_Bit; ++nIdx )
{
pPoint[ nIdx ] = pPalTbl[ pbyChrData[ nIdx ] ];
}
#endif
// Callback at PPU read/write
MapperPPU( PATTBL( pbyChrData ) );
/*-------------------------------------------------------------------*/
/* Backgroud Clipping */
/*-------------------------------------------------------------------*/
if ( !( PPU_R1 & R1_CLIP_BG ) )
{
WORD *pPointTop;
#if WORKFRAME_DEFINE == WORKFRAME_NONE
pPointTop = WorkLine;
#else
pPointTop = &WorkFrame[ PPU_Scanline * NES_DISP_WIDTH ];
#endif
InfoNES_MemorySet( pPointTop, 0, 8 << 1 );
}
/*-------------------------------------------------------------------*/
/* Clear a scanline if up and down clipping flag is set */
/*-------------------------------------------------------------------*/
if ( PPU_UpDown_Clip &&
( SCAN_ON_SCREEN_START > PPU_Scanline || PPU_Scanline > SCAN_BOTTOM_OFF_SCREEN_START ) )
{
WORD *pPointTop;
#if WORKFRAME_DEFINE == WORKFRAME_NONE
pPointTop = WorkLine;
#else
pPointTop = &WorkFrame[ PPU_Scanline * NES_DISP_WIDTH ];
#endif
InfoNES_MemorySet( pPointTop, 0, NES_DISP_WIDTH << 1 );
}
}
/*-------------------------------------------------------------------*/
/* Render a sprite */
/*-------------------------------------------------------------------*/
/* MMC5 VROM switch */
MapperRenderScreen( 0 );
if ( PPU_R1 & R1_SHOW_SP )
{
// Reset Scanline Sprite Count
PPU_R2 &= ~R2_MAX_SP;
// Reset sprite buffer
InfoNES_MemorySet( pSprBuf, 0, sizeof pSprBuf );
// Render a sprite to the sprite buffer
nSprCnt = 0;
for ( pSPRRAM = SPRRAM + ( 63 << 2 ); pSPRRAM >= SPRRAM; pSPRRAM -= 4 )
{
nY = pSPRRAM[ SPR_Y ] + 1;
if ( nY > PPU_Scanline || nY + PPU_SP_Height <= PPU_Scanline )
continue; // Next sprite
/*-------------------------------------------------------------------*/
/* A sprite in scanning line */
/*-------------------------------------------------------------------*/
// Holizontal Sprite Count +1
++nSprCnt;
nAttr = pSPRRAM[ SPR_ATTR ];
nYBit = PPU_Scanline - nY;
nYBit = ( nAttr & SPR_ATTR_V_FLIP ) ? ( PPU_SP_Height - nYBit - 1 ) : nYBit;
#ifndef RAM_LACK
nYBit <<= 3;
#endif /* !RAM_LACK */
if ( PPU_R0 & R0_SP_SIZE )
{
// Sprite size 8x16
if ( pSPRRAM[ SPR_CHR ] & 1 )
{
#ifdef RAM_LACK
pbyChrData = PPUBANK[ 4 ] + ( ( pSPRRAM[ SPR_CHR ] & 0xfe ) << 4 ) + ((nYBit & 0x8) << 1) + (nYBit & 0x7);
#else
pbyChrData = ChrBuf + 256 * 64 + ( ( pSPRRAM[ SPR_CHR ] & 0xfe ) << 6 ) + nYBit;
#endif /* RAM_LACK */
}
else
{
#ifdef RAM_LACK
pbyChrData = PPUBANK[ 0 ] + ( ( pSPRRAM[ SPR_CHR ] & 0xfe ) << 4 ) + ((nYBit & 0x8) << 1) + (nYBit & 0x7);
#else
pbyChrData = ChrBuf + ( ( pSPRRAM[ SPR_CHR ] & 0xfe ) << 6 ) + nYBit;
#endif /* RAM_LACK */
}
}
else
{
// Sprite size 8x8
#ifdef RAM_LACK
pbyChrData = PPU_SP_Base + ( pSPRRAM[ SPR_CHR ] << 4 ) + nYBit;
#else
pbyChrData = PPU_SP_Base + ( pSPRRAM[ SPR_CHR ] << 6 ) + nYBit;
#endif /* RAM_LACK */
}
nAttr ^= SPR_ATTR_PRI;
bySprCol = ( nAttr & ( SPR_ATTR_COLOR | SPR_ATTR_PRI ) ) << 2;
nX = pSPRRAM[ SPR_X ];
#ifdef RAM_LACK
tileData[0] = ( ( pbyChrData[ 0 ] >> 1 ) & 0x55 ) | ( pbyChrData[ 8 ] & 0xAA );
tileData[1] = ( pbyChrData[ 0 ] & 0x55 ) | ( ( pbyChrData[ 8 ] << 1 ) & 0xAA );
#endif /* RAM_LACK */
if ( nAttr & SPR_ATTR_H_FLIP )
{
// Horizontal flip
#ifdef RAM_LACK
if ( ( tileData[1] ) & 3 )
pSprBuf[ nX ] = bySprCol | (( tileData[1] ) & 3);
if ( ( tileData[0] ) & 3 )
pSprBuf[ nX + 1 ] = bySprCol | (( tileData[0] ) & 3);
if ( ( tileData[1] >> 2 ) & 3 )
pSprBuf[ nX + 2 ] = bySprCol | (( tileData[1] >> 2 ) & 3);
if ( ( tileData[0] >> 2 ) & 3 )
pSprBuf[ nX + 3 ] = bySprCol | (( tileData[0] >> 2 ) & 3);
if ( ( tileData[1] >> 4 ) & 3 )
pSprBuf[ nX + 4 ] = bySprCol | (( tileData[1] >> 4 ) & 3);
if ( ( tileData[0] >> 4 ) & 3 )
pSprBuf[ nX + 5 ] = bySprCol | (( tileData[0] >> 4 ) & 3);
if ( ( tileData[1] >> 6 ) & 3 )
pSprBuf[ nX + 6 ] = bySprCol | (( tileData[1] >> 6 ) & 3);
if ( ( tileData[0] >> 6 ) & 3 )
pSprBuf[ nX + 7 ] = bySprCol | (( tileData[0] >> 6 ) & 3);
#else
if ( pbyChrData[ 7 ] )
pSprBuf[ nX ] = bySprCol | pbyChrData[ 7 ];
if ( pbyChrData[ 6 ] )
pSprBuf[ nX + 1 ] = bySprCol | pbyChrData[ 6 ];
if ( pbyChrData[ 5 ] )
pSprBuf[ nX + 2 ] = bySprCol | pbyChrData[ 5 ];
if ( pbyChrData[ 4 ] )
pSprBuf[ nX + 3 ] = bySprCol | pbyChrData[ 4 ];
if ( pbyChrData[ 3 ] )
pSprBuf[ nX + 4 ] = bySprCol | pbyChrData[ 3 ];
if ( pbyChrData[ 2 ] )
pSprBuf[ nX + 5 ] = bySprCol | pbyChrData[ 2 ];
if ( pbyChrData[ 1 ] )
pSprBuf[ nX + 6 ] = bySprCol | pbyChrData[ 1 ];
if ( pbyChrData[ 0 ] )
pSprBuf[ nX + 7 ] = bySprCol | pbyChrData[ 0 ];
#endif /* RAM_LACK */
}
else
{
// Non flip
#ifdef RAM_LACK
if ( ( tileData[0] >> 6 ) & 3 )
pSprBuf[ nX ] = bySprCol | (( tileData[0] >> 6 ) & 3);
if ( ( tileData[1] >> 6 ) & 3 )
pSprBuf[ nX + 1 ] = bySprCol | (( tileData[1] >> 6 ) & 3);
if ( ( tileData[0] >> 4 ) & 3 )
pSprBuf[ nX + 2 ] = bySprCol | (( tileData[0] >> 4 ) & 3);
if ( ( tileData[1] >> 4 ) & 3 )
pSprBuf[ nX + 3 ] = bySprCol | (( tileData[1] >> 4 ) & 3);
if ( ( tileData[0] >> 2 ) & 3 )
pSprBuf[ nX + 4 ] = bySprCol | (( tileData[0] >> 2 ) & 3);
if ( ( tileData[1] >> 2 ) & 3 )
pSprBuf[ nX + 5 ] = bySprCol | (( tileData[1] >> 2 ) & 3);
if ( ( tileData[0] ) & 3 )
pSprBuf[ nX + 6 ] = bySprCol | (( tileData[0] ) & 3);
if ( ( tileData[1] ) & 3 )
pSprBuf[ nX + 7 ] = bySprCol | (( tileData[1] ) & 3);
#else
if ( pbyChrData[ 0 ] )
pSprBuf[ nX ] = bySprCol | pbyChrData[ 0 ];
if ( pbyChrData[ 1 ] )
pSprBuf[ nX + 1 ] = bySprCol | pbyChrData[ 1 ];
if ( pbyChrData[ 2 ] )
pSprBuf[ nX + 2 ] = bySprCol | pbyChrData[ 2 ];
if ( pbyChrData[ 3 ] )
pSprBuf[ nX + 3 ] = bySprCol | pbyChrData[ 3 ];
if ( pbyChrData[ 4 ] )
pSprBuf[ nX + 4 ] = bySprCol | pbyChrData[ 4 ];
if ( pbyChrData[ 5 ] )
pSprBuf[ nX + 5 ] = bySprCol | pbyChrData[ 5 ];
if ( pbyChrData[ 6 ] )
pSprBuf[ nX + 6 ] = bySprCol | pbyChrData[ 6 ];
if ( pbyChrData[ 7 ] )
pSprBuf[ nX + 7 ] = bySprCol | pbyChrData[ 7 ];
#endif /* RAM_LACK */
}
}
// Rendering sprite
pPoint -= ( NES_DISP_WIDTH - PPU_Scr_H_Bit );
for ( nX = 0; nX < NES_DISP_WIDTH; ++nX )
{
nSprData = pSprBuf[ nX ];
if ( nSprData && ( nSprData & 0x80 || pPoint[ nX ] & 0x8000 ) )
{
pPoint[ nX ] = PalTable[ ( nSprData & 0xf ) + 0x10 ];
}
}
/*-------------------------------------------------------------------*/
/* Sprite Clipping */
/*-------------------------------------------------------------------*/
if ( !( PPU_R1 & R1_CLIP_SP ) )
{
WORD *pPointTop;
#if WORKFRAME_DEFINE == WORKFRAME_NONE
pPointTop = WorkLine;
#else
pPointTop = &WorkFrame[ PPU_Scanline * NES_DISP_WIDTH ];
#endif
InfoNES_MemorySet( pPointTop, 0, 8 << 1 );
}
if ( nSprCnt >= 8 )
PPU_R2 |= R2_MAX_SP; // Set a flag of maximum sprites on scanline
}
}
/*===================================================================*/
/* */
/* InfoNES_GetSprHitY() : Get a position of scanline hits sprite #0 */
/* */
/*===================================================================*/
void InfoNES_GetSprHitY()
{
/*
* Get a position of scanline hits sprite #0
*
*/
int nYBit;
int nLine;
#ifdef RAM_LACK
BYTE *pbyChrData;
#else
DWORD *pdwChrData;
#endif
int nOff;
if ( SPRRAM[ SPR_ATTR ] & SPR_ATTR_V_FLIP )
{
// Vertical flip
nYBit = ( PPU_SP_Height - 1 );
#ifdef RAM_LACK
nOff = -1;
#else
nYBit <<= 3;
nOff = -2;
#endif /* RAM_LACK */
}
else
{
// Non flip
nYBit = 0;
#ifdef RAM_LACK
nOff = 1;
#else
nOff = 2;
#endif /* RAM_LACK */
}
if ( PPU_R0 & R0_SP_SIZE )
{
// Sprite size 8x16
if ( SPRRAM[ SPR_CHR ] & 1 )
{
#ifdef RAM_LACK
pbyChrData = ( PPUBANK[ 4 ] + ( ( SPRRAM[ SPR_CHR ] & 0xfe ) << 4 ) + ((nYBit & 0x8) << 1) + (nYBit & 0x7) );
#else
pdwChrData = (DWORD *)( ChrBuf + 256 * 64 + ( ( SPRRAM[ SPR_CHR ] & 0xfe ) << 6 ) + nYBit );
#endif /* RAM_LACK */
}
else
{
#ifdef RAM_LACK
pbyChrData = ( PPUBANK[ 0 ] + ( ( SPRRAM[ SPR_CHR ] & 0xfe ) << 4 ) + ((nYBit & 0x8) << 1) + (nYBit & 0x7) );
#else
pdwChrData = (DWORD * )( ChrBuf + ( ( SPRRAM[ SPR_CHR ] & 0xfe ) << 6 ) + nYBit );
#endif /* RAM_LACK */
}
}
else
{
// Sprite size 8x8
#ifdef RAM_LACK
pbyChrData = ( PPU_SP_Base + ( SPRRAM[ SPR_CHR ] << 4 ) + nYBit );
#else
pdwChrData = (DWORD *)( PPU_SP_Base + ( SPRRAM[ SPR_CHR ] << 6 ) + nYBit );
#endif /* RAM_LACK */
}
if ( ( SPRRAM[ SPR_Y ] + 1 <= SCAN_UNKNOWN_START ) && ( SPRRAM[SPR_Y] > 0 ) )
{
for ( nLine = 0; nLine < PPU_SP_Height; nLine++ )
{
#ifdef RAM_LACK
if ( pbyChrData[ 0 ] | pbyChrData[ 8 ] )
#else
if ( pdwChrData[ 0 ] | pdwChrData[ 1 ] )
#endif /* RAM_LACK */
{
// Scanline hits sprite #0
SpriteJustHit = SPRRAM[SPR_Y] + 1 + nLine;
nLine = SCAN_VBLANK_END;
}
#ifdef RAM_LACK
if( nLine == 7)
{
pbyChrData += nOff * 9;
}
else
{
pbyChrData += nOff;
}
#else
pdwChrData += nOff;
#endif /* RAM_LACK */
}
} else {
// Scanline didn't hit sprite #0
SpriteJustHit = SCAN_UNKNOWN_START + 1;
}
}

需要解释的是，我也是参照之前原有的处理调整成这个样的，也许不免会有Bug，比如我刚刚还修改了一处不细心导致的问题。
与此同时，有一处临时修改现在需要更正，那就是InfoNES_Mapper.h的60行，修改成：

#define PATTBL(a) ( (a) - PPUBANK[ 0 ] )

基本上有了这些，模拟器就算是完工咯。
以上就是这次移植的主要工作了。

最后不要忘记调整堆栈的大小，我就是忘了调整大小了，结果马里奥大叔都穿墙跑啦……而且还不容易发现错误在哪。

什么？有童鞋说跑得很慢？第一，请开启编译优化，建议试试速度优化O3；第二，InfoNES里有个叫FrameSkip的变量，嘿嘿……

对了，似乎这样还不能控制哪，怎么处理手柄消息呢？还记得接口函数中有个：

/* Get a joypad state */
void InfoNES_PadState( DWORD *pdwPad1, DWORD
*pdwPad2, DWORD *pdwSystem )
{
}

在这里给pdwPad1和pdwPad2赋值就OK了。
具体怎么赋值？可能可以参考下图吧，我不再继续研究啦。

最后是LM4F232板上可以运行的最终工程（不能控制）：

InfoNES097JRC1_SDL.7z (1.27 MB)
(下载次数: 102, 2013-10-31 09:52 上传)

另外，这InfoNES，据我仔细观察，也不是百试百灵的，好像沙罗曼蛇玩着就非常不正常。
不过能在我的80MHz的小板上跑马里奥大叔，我也是非常欣慰了。

[原创] 【试用心得】外传——《手把手教你移植InfoNES（到HANKER-LM4F232）》更新至20131030

回复评论（4）

沙发 abszy

板凳雪梦苍月

4楼 PGG王老师

5楼 shikghappy

[原创] 【试用心得】外传——《手把手教你移植InfoNES（到HANKER-LM4F232）》更新至20131030

回复评论 （4）

沙发 abszy

板凳 雪梦苍月

4楼 PGG王老师

5楼 shikghappy

回复评论（4）

板凳雪梦苍月