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Render: implement basic chr rom renderer

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This commit is contained in:
Andrew Glaze
2024-08-20 12:07:36 -04:00
parent 830bc5f65a
commit bd12a61330
3 changed files with 228 additions and 85 deletions
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34
Sources/Render/Frame.swift Normal file
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class Frame {
var data: [UInt8] = [UInt8](repeating: 0, count: WIDTH * HEIGHT * 3)
static let WIDTH = 256
static let HEIGHT = 240
func setPixel(_ loc: (x: Int, y: Int), _ color: (r: UInt8, g: UInt8, b: UInt8)) {
let base = loc.y * 3 * Frame.WIDTH + loc.x * 3
if base + 2 < data.count {
data[base] = color.r
data[base + 1] = color.g
data[base + 2] = color.b
}
}
}
struct NESColor {
static let SYSTEM_PALLETE: [(UInt8, UInt8, UInt8)] = [
(0x80, 0x80, 0x80), (0x00, 0x3D, 0xA6), (0x00, 0x12, 0xB0), (0x44, 0x00, 0x96), (0xA1, 0x00, 0x5E),
(0xC7, 0x00, 0x28), (0xBA, 0x06, 0x00), (0x8C, 0x17, 0x00), (0x5C, 0x2F, 0x00), (0x10, 0x45, 0x00),
(0x05, 0x4A, 0x00), (0x00, 0x47, 0x2E), (0x00, 0x41, 0x66), (0x00, 0x00, 0x00), (0x05, 0x05, 0x05),
(0x05, 0x05, 0x05), (0xC7, 0xC7, 0xC7), (0x00, 0x77, 0xFF), (0x21, 0x55, 0xFF), (0x82, 0x37, 0xFA),
(0xEB, 0x2F, 0xB5), (0xFF, 0x29, 0x50), (0xFF, 0x22, 0x00), (0xD6, 0x32, 0x00), (0xC4, 0x62, 0x00),
(0x35, 0x80, 0x00), (0x05, 0x8F, 0x00), (0x00, 0x8A, 0x55), (0x00, 0x99, 0xCC), (0x21, 0x21, 0x21),
(0x09, 0x09, 0x09), (0x09, 0x09, 0x09), (0xFF, 0xFF, 0xFF), (0x0F, 0xD7, 0xFF), (0x69, 0xA2, 0xFF),
(0xD4, 0x80, 0xFF), (0xFF, 0x45, 0xF3), (0xFF, 0x61, 0x8B), (0xFF, 0x88, 0x33), (0xFF, 0x9C, 0x12),
(0xFA, 0xBC, 0x20), (0x9F, 0xE3, 0x0E), (0x2B, 0xF0, 0x35), (0x0C, 0xF0, 0xA4), (0x05, 0xFB, 0xFF),
(0x5E, 0x5E, 0x5E), (0x0D, 0x0D, 0x0D), (0x0D, 0x0D, 0x0D), (0xFF, 0xFF, 0xFF), (0xA6, 0xFC, 0xFF),
(0xB3, 0xEC, 0xFF), (0xDA, 0xAB, 0xEB), (0xFF, 0xA8, 0xF9), (0xFF, 0xAB, 0xB3), (0xFF, 0xD2, 0xB0),
(0xFF, 0xEF, 0xA6), (0xFF, 0xF7, 0x9C), (0xD7, 0xE8, 0x95), (0xA6, 0xED, 0xAF), (0xA2, 0xF2, 0xDA),
(0x99, 0xFF, 0xFC), (0xDD, 0xDD, 0xDD), (0x11, 0x11, 0x11), (0x11, 0x11, 0x11)
]
}

80
Sources/Render/TileViewer.swift Normal file
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struct TileViewer {
static func showTile(chrRom: [UInt8], bank: Int, tileNum: Int) -> Frame {
guard bank <= 1 else { fatalError("CHR Rom bank must be >1") }
let frame = Frame()
let bank = bank * 0x1000
let tile = chrRom[(bank + tileNum * 16)...(bank + tileNum * 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 & upper) << 1 | (1 & lower)
upper = upper >> 1
lower = lower >> 1
let rgb = switch value {
case 0:
NESColor.SYSTEM_PALLETE[0x01]
case 1:
NESColor.SYSTEM_PALLETE[0x23]
case 2:
NESColor.SYSTEM_PALLETE[0x28]
case 3:
NESColor.SYSTEM_PALLETE[0x31]
default:
fatalError("Invalid Pallete Color type")
}
frame.setPixel((x, y), rgb)
}
}
return frame
}
static func showTileBank(chrRom: [UInt8], bank: Int) -> Frame {
let frame = Frame()
var tileY = 0
var tileX = 0
let bank = (bank * 0x1000)
for tileNum in 0..<255 {
if tileNum != 0 && tileNum % 20 == 0 {
tileY += 10;
tileX = 0;
}
let tile = chrRom[(bank + tileNum * 16)...(bank + tileNum * 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 & upper) << 1 | (1 & lower)
upper = upper >> 1
lower = lower >> 1
let rgb = switch value {
case 0:
NESColor.SYSTEM_PALLETE[0x01]
case 1:
NESColor.SYSTEM_PALLETE[0x23]
case 2:
NESColor.SYSTEM_PALLETE[0x28]
case 3:
NESColor.SYSTEM_PALLETE[0x31]
default:
fatalError("Invalid Pallete Color type")
}
frame.setPixel((tileX + x, tileY + y), rgb)
}
}
tileX += 10
}
return frame
}
}