1 files changed, 204 insertions, 0 deletions
diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 00000000..b88fb9cd
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,204 @@
+#include "global.h"
+#include "utils.h"
+#include "structures.h"
+#include "screen.h"
+
+static void StoreKeyInput(Input* input, u32 keyInput);
+
+typedef struct {
+    u16 paletteId;
+    u8 destPaletteNum;
+    u8 numPalettes;
+} PaletteGroup;
+
+typedef struct {
+    union {
+        int raw;
+        struct {
+            u8 filler0[0x3];
+            u8 unk3;
+        } bytes;
+    } unk0;
+    u32 dest;
+    u32 unk8;
+} GfxItem;
+
+extern const PaletteGroup* gPaletteGroups[];
+extern const u8 gGlobalGfxAndPalettes[];
+extern u32 gUsedPalettes;
+extern u16 gPaletteBuffer[];
+extern const GfxItem* gUnk_08100AA8[];
+
+void MemFill16(u32 value, void* dest, u32 size) {
+    DmaFill16(3, value, dest, size);
+}
+
+void MemFill32(u32 value, void* dest, u32 size) {
+    DmaFill32(3, value, dest, size);
+}
+
+void MemClear(void* dest, u32 size) {
+    u32 zero = 0;
+
+    switch (((u32)dest | size) & 3) {
+        case 0:
+            MemFill32(0, dest, size);
+            break;
+        case 2:
+            MemFill16(0, dest, size);
+            break;
+        default:
+            do {
+                *(u8*)dest = zero;
+                dest++;
+                size--;
+            } while (size != 0);
+    }
+}
+
+void MemCopy(const void* src, void* dest, u32 size) {
+    switch (((u32)src | (u32)dest | size) & 3) {
+        case 0:
+            DmaCopy32(3, src, dest, size);
+            break;
+        case 2:
+            DmaCopy16(3, src, dest, size);
+            break;
+        default:
+            do {
+                *(u8*)dest = *(u8*)src;
+                src++;
+                dest++;
+            } while (--size);
+    }
+}
+
+void ReadKeyInput(void) {
+    u32 keyInput = ~REG_KEYINPUT & KEYS_MASK;
+    StoreKeyInput(&gInput, keyInput);
+}
+
+static void StoreKeyInput(Input* input, u32 keyInput) {
+    u32 heldKeys = input->heldKeys;
+    u32 difference = keyInput & ~heldKeys;
+    input->newKeys = difference;
+    if (keyInput == heldKeys) {
+        if (--input->unk7 == 0) {
+            input->unk7 = 4;
+            input->unk4 = keyInput;
+        } else {
+            input->unk4 = 0;
+        }
+    } else {
+        input->unk7 = 0x14;
+        input->unk4 = difference;
+    }
+    input->heldKeys = keyInput;
+}
+
+void LoadPaletteGroup(u32 group) {
+    const PaletteGroup* paletteGroup = gPaletteGroups[group];
+    while (1) {
+        u32 destPaletteNum = paletteGroup->destPaletteNum;
+        u32 numPalettes = paletteGroup->numPalettes & 0xF;
+        if (numPalettes == 0) {
+            numPalettes = 16;
+        }
+        LoadPalettes(&gGlobalGfxAndPalettes[paletteGroup->paletteId * 32], destPaletteNum, numPalettes);
+        if ((paletteGroup->numPalettes & 0x80) == 0) {
+            break;
+        }
+        paletteGroup++;
+    }
+}
+
+void LoadPalettes(const u8* src, int destPaletteNum, int numPalettes) {
+    u16* dest;
+    u32 size = numPalettes * 32;
+    u32 usedPalettesMask = 1 << destPaletteNum;
+    while (--numPalettes > 0) {
+        usedPalettesMask |= (usedPalettesMask << 1);
+    }
+    gUsedPalettes |= usedPalettesMask;
+    dest = &gPaletteBuffer[destPaletteNum * 16];
+    DmaCopy32(3, src, dest, size);
+}
+
+void sub_0801D79C(u32 colorIndex, u32 color) {
+    gPaletteBuffer[colorIndex] = color;
+    gUsedPalettes |= 1 << (colorIndex / 16);
+}
+
+void sub_0801D7BC(u32 color, u32 arg1) {
+    if (arg1) {
+        gScreen.lcd.unk6 = 0xE0FF;
+    } else {
+        gScreen.lcd.unk6 = 0xFFFF;
+    }
+    sub_0801D79C(0, color);
+}
+
+void LoadGfxGroup(u32 group) {
+    u32 terminator;
+    u32 dmaCtrl;
+    int gfxOffset;
+    const u8* src;
+    u32 dest;
+    int size;
+    const GfxItem* gfxItem = gUnk_08100AA8[group];
+    while (1) {
+        u32 loadGfx = FALSE;
+        u32 ctrl = gfxItem->unk0.bytes.unk3;
+        ctrl &= 0xF;
+        switch (ctrl) {
+            case 0x7:
+                loadGfx = TRUE;
+                break;
+            case 0xD:
+                return;
+            case 0xE:
+                if (gUnk_02000000->gameLanguage != 0 && gUnk_02000000->gameLanguage != 1) {
+                    loadGfx = TRUE;
+                }
+                break;
+            case 0xF:
+                if (gUnk_02000000->gameLanguage != 0) {
+                    loadGfx = TRUE;
+                }
+                break;
+            default:
+                if (ctrl == gUnk_02000000->gameLanguage) {
+                    loadGfx = TRUE;
+                }
+                break;
+        }
+
+        if (loadGfx) {
+            gfxOffset = gfxItem->unk0.raw & 0xFFFFFF;
+            src = &gGlobalGfxAndPalettes[gfxOffset];
+            dest = gfxItem->dest;
+            size = gfxItem->unk8;
+            dmaCtrl = 0x80000000;
+            if (size < 0) {
+                if (dest >= VRAM) {
+                    LZ77UnCompVram(src, (void*)dest);
+                } else {
+                    LZ77UnCompWram(src, (void*)dest);
+                }
+            } else {
+                DmaSet(3, src, dest, dmaCtrl | ((u32)size >> 1));
+            }
+        }
+
+        terminator = gfxItem->unk0.bytes.unk3;
+        terminator &= 0x80;
+        gfxItem++;
+        if (!terminator) {
+            break;
+        }
+    }
+}
+
+/* TODO:
+    clear OAM, zMalloc, etc.
+*/