feat: MVP for 2d_sprites.gba

.gitignore

@@ -4,3 +4,4 @@ zig-cache/
 **/*.s
 **/*.asm
 **/*.bin
+**/*.sav

src/2d_sprites.zig

@@ -11,8 +11,83 @@ const SquareSpriteTuple = std.meta.Tuple(&[_]type{ Rainbow, Bebe16, Bebe32, Bebe
 // TODO: ZigGBA should support spaces in the ROM Title IIRC
 export var gameHeader linksection(".gbaheader") = GBA.Header.setup("2DSPRITE", "PAOD", "00", 0);
 
-// 16x16 4BPP Sprite depicting
+// To-do List:
-// denpa artist Nanahira's pet rabbit: Bebe-chan
+// TODO: 8BPP variants?
+// TODO: Tall Sprites
+// TODO: Wide Sprites
+// TODO: 8x8 Bebe-chan
+
+const square_sprites = initSquareSpriteTuple();
+
+fn initSquareSpriteTuple() SquareSpriteTuple {
+    return .{ Rainbow{}, Bebe16{}, Bebe32{}, Bebe64{} };
+}
+
+pub fn main() noreturn {
+    LCD.setupDisplayControl(.{
+        .mode = .Mode0, // No Affine BGs
+        .objectLayer = .Show, // Enable Sprites
+        .objVramCharacterMapping = .TwoDimension, // 2D Sprite Mapping
+    });
+
+    OAM.init();
+
+    square_sprites[0].load(); // Copy Mapping to VRAM and Palette to PALRAM
+
+    var sprite: *OAM.Attribute = OAM.allocate();
+    sprite.paletteMode = square_sprites[0].paletteMode();
+    sprite.palette = 0;
+    sprite.tileIndex = 0;
+    sprite.setSize(square_sprites[0].size());
+
+    var x: i32 = 96;
+    var y: i32 = 32;
+
+    var i: i32 = 0;
+
+    while (true) {
+        LCD.naiveVSync();
+        Input.readInput();
+
+        const shoulder = Input.getShoulderJustPressed();
+        if (shoulder != 0) {
+            i = (i + shoulder) & 0b11;
+
+            // Index must be comptime known unfortunately
+            // so we need this ugly switch statement
+            switch (i) {
+                0 => {
+                    square_sprites[0].load();
+                    sprite.setSize(square_sprites[0].size());
+                },
+                1 => {
+                    square_sprites[1].load();
+                    sprite.setSize(square_sprites[1].size());
+                },
+                2 => {
+                    square_sprites[2].load();
+                    sprite.setSize(square_sprites[2].size());
+                },
+                3 => {
+                    square_sprites[3].load();
+                    sprite.setSize(square_sprites[3].size());
+                },
+                else => unreachable,
+            }
+        }
+
+        x += Input.getHorizontal() * 2;
+        y += Input.getVertical() * 2;
+
+        sprite.setPosition(x, y);
+
+        OAM.update(1);
+    }
+}
+
+/// 16x16 4bpp Sprite
+/// Denpa vocalist Nanahira's pet rabbit: Bebe-chan
+// Ad: If you're weeb enough, check out Denpasongs
 const Bebe16 = struct {
     const Self = @This();
 
@@ -34,6 +109,7 @@ const Bebe16 = struct {
     fn size(_: Self) OAM.ObjectSize {
         return .Size16x16;
     }
+
     fn load(_: Self) void {
         // In Memory, Tile Map is laid out like: 1 2
         //                                       3 4
@@ -48,7 +124,8 @@ const Bebe16 = struct {
     }
 };
 
-// Bebe-chan but bigger
+/// 32x32 Bebe-chan
+/// Same art as Bebe16, but scaled up
 const Bebe32 = struct {
     const Self = @This();
 
@@ -102,7 +179,8 @@ const Bebe32 = struct {
     }
 };
 
-// The Biggest Bebe-chan yet
+/// 64x64 Bebe-chan
+/// Same art as Bebe16, just scaled up
 const Bebe64 = struct {
     const Self = @This();
 
@@ -214,9 +292,7 @@ const Bebe64 = struct {
     }
 };
 
-// 8x8 4bpp Sprite depicting a Rainbow
+/// 8x8 4bpp Sprite depicting a Rainbow-like gradient 'cause I can't draw
-// (it's more of a gradiant, I don't know english, whatever.)
-// source: Laziness? I can't draw, especially within the confines of 8x8 pixels
 const Rainbow = struct {
     const Self = @This();
 
@@ -228,15 +304,15 @@ const Rainbow = struct {
         0x11111111, 0x22222222, 0x33333333, 0x44444444, 0x55555555, 0x66666666, 0x77777777, 0x88888888,
     };
 
-    inline fn paletteMode(_: Self) GBA.PaletteMode {
+    fn paletteMode(_: Self) GBA.PaletteMode {
         return .Color16;
     }
 
-    inline fn size(_: Self) OAM.ObjectSize {
+    fn size(_: Self) OAM.ObjectSize {
         return .Size8x8;
     }
 
-    inline fn load(_: Self) void {
+    fn load(_: Self) void {
         // 8x8 Sprites don't differ in any meaningful way between 1D and 2D mapping
 
         // Copy Tile Mapping
@@ -246,71 +322,3 @@ const Rainbow = struct {
         GBA.memcpy32(GBA.OBJ_PALETTE_RAM, &Self.pal, Self.pal.len * @sizeOf(u32));
     }
 };
-
-const square_sprites = withoutThisMethodZigComplains();
-
-fn withoutThisMethodZigComplains() SquareSpriteTuple {
-    return .{ Rainbow{}, Bebe16{}, Bebe32{}, Bebe64{} };
-}
-
-pub fn main() noreturn {
-    LCD.setupDisplayControl(.{
-        .mode = .Mode0, // No Affine BGs
-        .objectLayer = .Show, // Enable Sprites
-        .objVramCharacterMapping = .TwoDimension, // 2D Sprite Mapping
-    });
-
-    OAM.init();
-
-    square_sprites[0].load(); // Copy Mapping to VRAM and Palette to PALRAM
-
-    var sprite: *OAM.Attribute = OAM.allocate();
-    sprite.paletteMode = square_sprites[0].paletteMode();
-    sprite.palette = 0;
-    sprite.tileIndex = 0;
-    sprite.setSize(square_sprites[0].size());
-
-    var x: i32 = 96;
-    var y: i32 = 32;
-
-    var i: i32 = 0;
-
-    while (true) {
-        LCD.naiveVSync();
-        Input.readInput();
-
-        const shoulder = Input.getShoulderJustPressed();
-        if (shoulder != 0) {
-            i = (i + shoulder) & 0b11;
-
-            // Index must be comptime known unfortunately
-            // so we need this ugly switch statement
-            switch (i) {
-                0 => {
-                    square_sprites[0].load();
-                    sprite.setSize(square_sprites[0].size());
-                },
-                1 => {
-                    square_sprites[1].load();
-                    sprite.setSize(square_sprites[1].size());
-                },
-                2 => {
-                    square_sprites[2].load();
-                    sprite.setSize(square_sprites[2].size());
-                },
-                3 => {
-                    square_sprites[3].load();
-                    sprite.setSize(square_sprites[3].size());
-                },
-                else => unreachable,
-            }
-        }
-
-        x += Input.getHorizontal() * 2;
-        y += Input.getVertical() * 2;
-
-        sprite.setPosition(x, y);
-
-        OAM.update(1);
-    }
-}