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Render: Impl sprite rendering

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This commit is contained in:
Andrew Glaze
2024-08-21 16:42:05 -04:00
parent ddd8fd6ee6
commit 6974110b22
4 changed files with 90 additions and 13 deletions
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72
Sources/Render/Render.swift
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@@ -4,11 +4,11 @@ class Render {
for i in 0..<0x03c0 { // FIXME: For now, just use first nametable
let tileAddr = UInt16(ppu.vram[i])
//print(ppu.vram)
let tileLoc = (col: i % 32, row: i / 32)
let tile = ppu.chrRom[(bank + Int(tileAddr) * 16)...(bank + Int(tileAddr) * 16 + 15)]
let palette = getBgPallete(ppu, tileLoc: tileLoc)
let bgPalette = getBgPalette(ppu, tileLoc: tileLoc)
// MARK: Draw Background
for y in 0...7 {
var upper = tile[tile.startIndex + y]
var lower = tile[tile.startIndex + y + 8]
@@ -21,21 +21,71 @@ class Render {
case 0:
NESColor.SYSTEM_PALLETE[Int(ppu.paletteTable[0])]
case 1:
NESColor.SYSTEM_PALLETE[Int(palette[1])]
NESColor.SYSTEM_PALLETE[Int(bgPalette[1])]
case 2:
NESColor.SYSTEM_PALLETE[Int(palette[2])]
NESColor.SYSTEM_PALLETE[Int(bgPalette[2])]
case 3:
NESColor.SYSTEM_PALLETE[Int(palette[3])]
NESColor.SYSTEM_PALLETE[Int(bgPalette[3])]
default:
fatalError("Invalid Pallete Color type")
}
frame.setPixel((tileLoc.col * 8 + x, tileLoc.row * 8 + y), rgb)
}
}
// MARK: Draw Sprites
for i in stride(from: 0, to: ppu.oamData.count, by: 4) {
let tileIndex = UInt16(ppu.oamData[i + 1])
let tileX = Int(ppu.oamData[i + 3])
let tileY = Int(ppu.oamData[i])
let flipVert = ppu.oamData[i + 2] >> 7 & 1 == 1
let flipHori = ppu.oamData[i + 2] >> 6 & 1 == 1
let paletteIndex = ppu.oamData[i + 2] & 0b11
let spritePallete = getSpritePalette(ppu, paletteIndex: paletteIndex)
let bank = ppu.ctrl.spritePatternAddr()
let tile = ppu.chrRom[(bank + Int(tileIndex) * 16)...(bank + Int(tileIndex) * 16 + 15)]
for y in 0...7 {
var upper = tile[tile.startIndex + y]
var lower = tile[tile.startIndex + y + 8]
for x in (0...7).reversed() {
let value = (1 & lower) << 1 | (1 & upper)
upper = upper >> 1
lower = lower >> 1
if (value == 0) {
continue // skip coloring this pixel, it's transparent
}
let rgb = switch value {
case 1:
NESColor.SYSTEM_PALLETE[Int(spritePallete[1])]
case 2:
NESColor.SYSTEM_PALLETE[Int(spritePallete[2])]
case 3:
NESColor.SYSTEM_PALLETE[Int(spritePallete[3])]
default:
fatalError("Invalid Pallete Color type")
}
switch (flipHori, flipVert) {
case (false, false):
frame.setPixel((tileX + x, tileY + y), rgb)
case (true, false):
frame.setPixel((tileX + 7 - x, tileY + y), rgb)
case (false, true):
frame.setPixel((tileX + x, tileY + 7 - y), rgb)
case (true, true):
frame.setPixel((tileX + 7 - x, tileY + 7 - y), rgb)
}
}
}
}
}
}
static func getBgPallete(_ ppu: NesPPU, tileLoc: (col: Int, row: Int)) -> [UInt8] {
static func getBgPalette(_ ppu: NesPPU, tileLoc: (col: Int, row: Int)) -> [UInt8] {
let attrTableIndex = tileLoc.row / 4 * 8 + tileLoc.col / 4
let attrByte = ppu.vram[0x3c0 + attrTableIndex] // FIXME: still using hardcoded first nametable
@@ -55,4 +105,14 @@ class Render {
let palleteStartIndex = 1 + Int(palleteIndex) * 4
return [ppu.paletteTable[0], ppu.paletteTable[palleteStartIndex], ppu.paletteTable[palleteStartIndex + 1], ppu.paletteTable[palleteStartIndex + 2]]
}
static func getSpritePalette(_ ppu: NesPPU, paletteIndex: UInt8) -> [UInt8] {
let start = 0x11 + Int(paletteIndex * 4)
return [
0,
ppu.paletteTable[start],
ppu.paletteTable[start + 1],
ppu.paletteTable[start + 2]
]
}
}