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8 times lesser conversion table for previous lol.

This commit is contained in:
g0me3 2019-06-30 18:58:16 +03:00
parent d5896a8b93
commit 57d0b92a0f
1 changed files with 24 additions and 3 deletions
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27
src/boards/vrc5.cpp
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@ -42,7 +42,7 @@ static uint8 *WRAM = NULL;
static uint8 IRQa, K4IRQ;
static uint32 IRQLatch, IRQCount;
// some kind of 16-bit text encoding (actually 15-bit) used in game resources
// some kind of 16-bit text encoding (actually 14-bit) used in game resources
// may be converted by the hardware into the tile indexes for internal CHR ROM
// not sure whey they made it hardware, because most of calculations are just
// bit shifting. the main purpose of this table is to calculate actual CHR ROM
@ -51,7 +51,16 @@ static uint32 IRQLatch, IRQCount;
// table read out from hardware registers as is
static uint8 conv_tbl[128][4] = {
///*
static uint8 conv_tbl[4][8] = {
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x00, 0x00, 0x40, 0x10, 0x28, 0x00, 0x18, 0x30 },
{ 0x00, 0x00, 0x48, 0x18, 0x30, 0x08, 0x20, 0x38 },
{ 0x00, 0x00, 0x80, 0x20, 0x38, 0x10, 0x28, 0xB0 }
};
//*/
/*
static uint8 conv_tbl[64][4] = {
{ 0x40, 0x40, 0x40, 0x40 }, // 00 | A - 40 41 42 43 44 45 46 47
{ 0x41, 0x41, 0x41, 0x41 }, // 02 | B - 48 49 4A 4B 4C 4D 4E 4F
{ 0x42, 0x42, 0x42, 0x42 }, // 04 | C - 50 51 52 53 54 55 56 57
@ -117,6 +126,7 @@ static uint8 conv_tbl[128][4] = {
{ 0x46, 0x76, 0x7E, 0x76 }, // 7C
{ 0x47, 0x77, 0x7F, 0x77 }, // 7E
};
*/
static uint8 regs[16];
static SFORMAT StateRegs[] =
@ -169,8 +179,19 @@ static DECLFW(QTAiWrite) {
}
static DECLFR(QTAiRead) {
uint8 res1 = conv_tbl[regs[0xD] >> 1][(regs[0xC] >> 5) & 3];
// uint8 res1 = conv_tbl[(regs[0xD] & 0x7F) >> 1][(regs[0xC] >> 5) & 3];
// uint8 res2 = ((regs[0xD] & 1) << 7) | ((regs[0xC] & 0x1F) << 2) | (regs[0xB] & 3);
uint8 tabl = conv_tbl[(regs[0xC] >> 5) & 3][(regs[0xD] & 0x7F) >> 4];
uint8 res1 = 0x40 | (tabl & 0x3F) | ((regs[0xD] >> 1) & 7);
uint8 res2 = ((regs[0xD] & 1) << 7) | ((regs[0xC] & 0x1F) << 2) | (regs[0xB] & 3);
if (tabl & 0x40)
res1 &= 0xFB;
else if (tabl & 0x80)
res1 |= 0x04;
if (A == 0xDD00) {
return res1;
} else if (A == 0xDC00) {