135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
#ifdef PPU_CPP
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uint8* PPU::Cache::tile_2bpp(unsigned tile) {
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if(tilevalid[0][tile] == 0) {
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tilevalid[0][tile] = 1;
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uint8 *output = (uint8*)tiledata[0] + (tile << 6);
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unsigned offset = tile << 4;
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unsigned y = 8;
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unsigned color, d0, d1;
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while(y--) {
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d0 = ppu.vram[offset + 0];
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d1 = ppu.vram[offset + 1];
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#define render_line(mask) \
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color = !!(d0 & mask) << 0; \
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color |= !!(d1 & mask) << 1; \
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*output++ = color
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render_line(0x80);
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render_line(0x40);
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render_line(0x20);
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render_line(0x10);
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render_line(0x08);
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render_line(0x04);
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render_line(0x02);
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render_line(0x01);
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#undef render_line
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offset += 2;
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}
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}
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return tiledata[0] + (tile << 6);
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}
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uint8* PPU::Cache::tile_4bpp(unsigned tile) {
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if(tilevalid[1][tile] == 0) {
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tilevalid[1][tile] = 1;
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uint8 *output = (uint8*)tiledata[1] + (tile << 6);
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unsigned offset = tile << 5;
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unsigned y = 8;
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unsigned color, d0, d1, d2, d3;
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while(y--) {
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d0 = ppu.vram[offset + 0];
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d1 = ppu.vram[offset + 1];
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d2 = ppu.vram[offset + 16];
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d3 = ppu.vram[offset + 17];
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#define render_line(mask) \
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color = !!(d0 & mask) << 0; \
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color |= !!(d1 & mask) << 1; \
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color |= !!(d2 & mask) << 2; \
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color |= !!(d3 & mask) << 3; \
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*output++ = color
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render_line(0x80);
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render_line(0x40);
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render_line(0x20);
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render_line(0x10);
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render_line(0x08);
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render_line(0x04);
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render_line(0x02);
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render_line(0x01);
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#undef render_line
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offset += 2;
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}
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}
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return tiledata[1] + (tile << 6);
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}
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uint8* PPU::Cache::tile_8bpp(unsigned tile) {
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if(tilevalid[2][tile] == 0) {
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tilevalid[2][tile] = 1;
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uint8 *output = (uint8*)tiledata[2] + (tile << 6);
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unsigned offset = tile << 6;
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unsigned y = 8;
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unsigned color, d0, d1, d2, d3, d4, d5, d6, d7;
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while(y--) {
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d0 = ppu.vram[offset + 0];
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d1 = ppu.vram[offset + 1];
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d2 = ppu.vram[offset + 16];
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d3 = ppu.vram[offset + 17];
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d4 = ppu.vram[offset + 32];
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d5 = ppu.vram[offset + 33];
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d6 = ppu.vram[offset + 48];
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d7 = ppu.vram[offset + 49];
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#define render_line(mask) \
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color = !!(d0 & mask) << 0; \
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color |= !!(d1 & mask) << 1; \
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color |= !!(d2 & mask) << 2; \
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color |= !!(d3 & mask) << 3; \
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color |= !!(d4 & mask) << 4; \
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color |= !!(d5 & mask) << 5; \
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color |= !!(d6 & mask) << 6; \
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color |= !!(d7 & mask) << 7; \
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*output++ = color
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render_line(0x80);
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render_line(0x40);
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render_line(0x20);
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render_line(0x10);
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render_line(0x08);
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render_line(0x04);
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render_line(0x02);
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render_line(0x01);
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#undef render_line
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offset += 2;
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}
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}
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return tiledata[2] + (tile << 6);
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}
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uint8* PPU::Cache::tile(unsigned bpp, unsigned tile) {
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switch(bpp) {
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case 0: return tile_2bpp(tile);
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case 1: return tile_4bpp(tile);
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case 2: return tile_8bpp(tile);
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}
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}
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PPU::Cache::Cache(PPU &self) : self(self) {
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tiledata[0] = (uint8*)alloc_invisible(262144);
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tiledata[1] = (uint8*)alloc_invisible(131072);
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tiledata[2] = (uint8*)alloc_invisible(65536);
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tilevalid[0] = (uint8*)alloc_invisible(4096);
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tilevalid[1] = (uint8*)alloc_invisible(2048);
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tilevalid[2] = (uint8*)alloc_invisible(1024);
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}
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PPU::Cache::invalidate() {
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memset(tilevalid[0], 0, 4096);
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memset(tilevalid[1], 0, 2048);
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memset(tilevalid[2], 0, 1024);
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}
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PPU::Cache::~Cache()
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{
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abort();
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}
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#endif
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