mirror of https://github.com/bsnes-emu/bsnes.git
93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
auto PPU::renderColorFetch(uint16 offset, uint3 y, uint3 x) -> uint4 {
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uint4 color;
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if(system.planar()) {
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uint32 data = iram.read(offset + (y << 2), Long);
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color |= data.bit( 7 - x) << 0;
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color |= data.bit(15 - x) << 1;
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color |= data.bit(23 - x) << 2;
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color |= data.bit(31 - x) << 3;
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}
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if(system.packed()) {
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uint8 data = iram.read(offset + (y << 2) + (x >> 1));
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color = data >> (4 - (x.bit(0) << 2));
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}
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return color;
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}
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auto PPU::renderColorBack() -> void {
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uint12 color = iram.read(0xfe00 + (r.backColor << 1), Word);
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pixel = {Pixel::Source::Back, color};
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}
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auto PPU::renderColorScreenOne() -> void {
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if(!r.screenOneEnable) return;
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uint8 scrollY = status.vclk + r.scrollOneY;
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uint8 scrollX = status.hclk + r.scrollOneX;
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uint16 tilemapOffset = r.screenOneMapBase << 11;
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tilemapOffset += (scrollY >> 3) << 6;
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tilemapOffset += (scrollX >> 3) << 1;
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uint16 tile = iram.read(tilemapOffset, Word);
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uint16 tileOffset = 0x4000 + (tile.bit(13) << 14) + (tile.bits(0,8) << 5);
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uint3 tileY = (scrollY & 7) ^ (tile.bit(15) ? 7 : 0);
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uint3 tileX = (scrollX & 7) ^ (tile.bit(14) ? 7 : 0);
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uint4 tileColor = renderColorFetch(tileOffset, tileY, tileX);
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if(tileColor == 0) return;
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uint12 color = iram.read(0xfe00 + (tile.bits(9, 12) << 5) + (tileColor << 1), Word);
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pixel = {Pixel::Source::ScreenOne, color};
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}
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auto PPU::renderColorScreenTwo() -> void {
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if(!r.screenTwoEnable) return;
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bool windowInside = status.vclk >= r.screenTwoWindowY0 && status.vclk <= r.screenTwoWindowY1
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&& status.hclk >= r.screenTwoWindowX0 && status.hclk <= r.screenTwoWindowX1;
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windowInside ^= r.screenTwoWindowInvert;
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if(r.screenTwoWindowEnable && !windowInside) return;
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uint8 scrollY = status.vclk + r.scrollTwoY;
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uint8 scrollX = status.hclk + r.scrollTwoX;
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uint16 tilemapOffset = r.screenTwoMapBase << 11;
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tilemapOffset += (scrollY >> 3) << 6;
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tilemapOffset += (scrollX >> 3) << 1;
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uint16 tile = iram.read(tilemapOffset, Word);
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uint16 tileOffset = 0x4000 + (tile.bit(13) << 14) + (tile.bits(0,8) << 5);
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uint3 tileY = (scrollY & 7) ^ (tile.bit(15) ? 7 : 0);
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uint3 tileX = (scrollX & 7) ^ (tile.bit(14) ? 7 : 0);
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uint4 tileColor = renderColorFetch(tileOffset, tileY, tileX);
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if(tileColor == 0) return;
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uint12 color = iram.read(0xfe00 + (tile.bits(9,12) << 5) + (tileColor << 1), Word);
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pixel = {Pixel::Source::ScreenTwo, color};
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}
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auto PPU::renderColorSprite() -> void {
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if(!r.spriteEnable) return;
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bool windowInside = status.hclk >= r.spriteWindowX0 && status.hclk <= r.spriteWindowX1;
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for(auto& sprite : sprites) {
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if(r.spriteWindowEnable && sprite.window && !windowInside) continue;
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if(status.hclk < sprite.x) continue;
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if(status.hclk > sprite.x + 7) continue;
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uint16 tileOffset = 0x4000 + (sprite.tile << 5);
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uint3 tileY = (uint8)(status.vclk - sprite.y) ^ (sprite.vflip ? 7 : 0);
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uint3 tileX = (uint8)(status.hclk - sprite.x) ^ (sprite.hflip ? 7 : 0);
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uint4 tileColor = renderColorFetch(tileOffset, tileY, tileX);
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if(tileColor == 0) continue;
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if(!sprite.priority && pixel.source == Pixel::Source::ScreenTwo) continue;
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uint12 color = iram.read(0xfe00 + (sprite.palette << 5) + (tileColor << 1), Word);
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pixel = {Pixel::Source::Sprite, color};
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break;
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}
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}
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