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- [NEW] Window implementada

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This commit is contained in:
Raimon Zamora
2025-01-26 10:43:13 +01:00
parent f5d89e0b9b
commit 59feaf274f
1 changed files with 44 additions and 0 deletions
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44
gbscreen.cpp
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@@ -135,6 +135,10 @@ namespace gbscreen
void fill_line_buffer_bkg(uint8_t LY)
{
const uint8_t LCDC = mem::readMem(0xff40);
if ((LCDC & 0x1) == 0) {
for (int i=0; i<160; ++i) line_buffer[i]=0;
return;
}
const uint8_t SCY = mem::readMem(0xff42);
const uint8_t SCX = mem::readMem(0xff43);
const uint8_t BGP = mem::readMem(0xff47);
@@ -169,6 +173,45 @@ namespace gbscreen
}
}
void fill_line_buffer_win(uint8_t LY)
{
const uint8_t LCDC = mem::readMem(0xff40);
if ((LCDC & 0x21) == 0) return;
const uint8_t WY = mem::readMem(0xff4a);
if (LY<WY) return;
const uint8_t WX = mem::readMem(0xff4b);
const uint8_t BGP = mem::readMem(0xff47);
const uint16_t ty = uint8_t(LY-WY) >> 3;
const uint8_t ly = uint8_t(LY-WY) & 0x7;
uint8_t ox = WX<7 ? 7-WX : 0;
uint16_t tx = 0;
uint16_t base_tilemap_address = LCDC&0x40 ? 0x9c00 : 0x9800;
int pi = WX<7 ? 0 : WX-7;
while(true) {
uint16_t tilemap_address = base_tilemap_address + tx + (ty<<5);
uint16_t tile = mem::readMem(tilemap_address);
uint16_t base_tile_address = 0x8000;
if ( ((LCDC&0x10)==0) && (tile<128) ) base_tile_address = 0x9000;
uint16_t tile_address = base_tile_address + (tile<<4) + (ly*2);
uint8_t a = mem::readMem(tile_address);
uint8_t b = mem::readMem(tile_address+1);
for (int i=0; i<8; ++i) {
if (ox==0) {
uint8_t index = (a&0x80 ? 1 : 0) + (b&0x80 ? 2 : 0 );
line_buffer[pi++] = (BGP >> (index*2)) & 0x3;
} else {
ox--;
}
a=a<<1; b=b<<1;
if (pi==160) return;
}
tx = (tx+1)&0x1f;
}
}
struct oam_entry_t
{
uint8_t y, x, tile, attr;
@@ -288,6 +331,7 @@ namespace gbscreen
STAT = (STAT & 0xFC) | 0x02; // Set mode 2
if (STAT&0x20) stat_interrupt = true;
fill_line_buffer_bkg(LY);
fill_line_buffer_win(LY);
fill_line_buffer_obj(LY);
}
else if (LY==154)