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Add support for flipped and bank1 tiles to the render background method #80

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Add support for flipped and bank1 tiles to the render background method #80

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24 changes: 18 additions & 6 deletions src/emulator.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5269,21 +5269,33 @@ void emulator_render_vram(Emulator* e, u32* buffer) {

void emulator_render_background(Emulator* e, u32* buffer, int type) {
memset(buffer, 0, sizeof(u32) * 256 * 256);
int bank = 0;
int tile_map = 0x1800 + ((type & 1) ? 0x400 : 0);
for (int ty = 0; ty < 32; ty++) {
for (int tx = 0; tx < 32; tx++) {
u8 tile = VRAM.data[tile_map + tx + ty * 32];
int map_index = tile_map + tx + ty * 32;
u8 tile = VRAM.data[map_index];
u8 attr = VRAM.data[0x2000 + map_index];

int tile_bank_offset = (IS_CGB && (attr & 0x08)) ? 0x2000 : 0;
int xflip = IS_CGB && (attr & 0x20);
int yflip = IS_CGB && (attr & 0x40);

int offset = 0;
if(tile < 128)
offset = (LCDC.bg_tile_data_select == TILE_DATA_8000_8FFF) ? 0 : 0x1000;
for (int row = 0; row < 8; row++) {
int n = offset + tile * 16 + row * 2;
u8 a = VRAM.data[n];
u8 b = VRAM.data[n + 1];
int py = yflip ? (7 - row) : row;
int n = offset + tile * 16 + py * 2;

u8 a = VRAM.data[tile_bank_offset + n];
u8 b = VRAM.data[tile_bank_offset + n + 1];

for (int x = 0; x < 8; x++) {
u32 color = 0xFFC2F0C4;
u8 bit = (0x80 >> x);

int px = xflip ? (7 - x) : x;
u8 bit = (0x80 >> px);

if ((a & bit) && (b & bit)) {
color = 0xFF001B2D;
} else if (a & bit) {
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