mirror of https://github.com/bsnes-emu/bsnes.git
32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
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auto PPU::renderSpriteDecode() -> void {
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sprites.reset();
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sprites.reserve(32);
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if(!r.spriteEnable) return;
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uint offset = 0;
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bool windowInside = status.vclk >= r.spriteWindowY0 && status.vclk <= r.spriteWindowY1;
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uint16 spriteBase = r.spriteBase.bits(0, 4 + system.depth()) << 9;
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uint7 spriteIndex = r.spriteFirst;
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uint8 spriteCount = min(128, (uint)r.spriteCount);
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while(spriteCount--) {
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uint32 attributes = iram.read(spriteBase + (spriteIndex++ << 2), Long);
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Sprite sprite;
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sprite.x = attributes.bits(24,31);
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if(sprite.x > 224) continue;
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sprite.y = attributes.bits(16,23);
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if(status.vclk < sprite.y) continue;
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if(status.vclk > sprite.y + 7) continue;
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sprite.vflip = attributes.bit(15);
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sprite.hflip = attributes.bit(14);
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sprite.priority = attributes.bit(13);
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sprite.window = attributes.bit(12);
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if(r.spriteWindowEnable && sprite.window && !windowInside) continue;
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sprite.palette = 8 + attributes.bits(9,11);
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sprite.tile = attributes.bits(0,8);
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sprites.append(sprite);
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if(sprites.size() >= 32) break;
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}
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}
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