decompile palette.c

3 files changed, 827 insertions, 10 deletions

diff --git a/src/link.c b/src/link.c
index 5a194e449..cb75ebca7 100644
--- a/src/link.c
+++ b/src/link.c
@@ -5,6 +5,7 @@
 #include "sprite.h"
 #include "songs.h"
 #include "link.h"
+#include "palette.h"
 
 #define SIO_MULTI_CNT ((struct SioMultiCnt *)REG_ADDR_SIOCNT)
 
@@ -25,12 +26,9 @@ struct LinkTestBGInfo
     u32 dummy_C;
 };
 
-extern void LoadPalette(const u16 *, u16, u32);
 extern void sub_8071C4C(const struct WindowConfig *);
 extern u16 Random(void);
 extern void SeedRng(u16);
-extern s32 fade_and_return_progress_probably(void);
-extern void copy_pal_bg_faded_to_pal_ram(void);
 extern void sub_80516C4(u8, u16);
 
 extern u8 unk_2000000[];
@@ -263,7 +261,7 @@ static void LinkTestScreen(void)
     RunTasks();
     AnimateSprites();
     BuildOamBuffer();
-    fade_and_return_progress_probably();
+    UpdatePaletteFade();
     sDummy3 = 0;
     InitLocalLinkPlayer();
     CreateTask(Task_PrintTestData, 0);
@@ -298,7 +296,7 @@ static void VBlankCB_LinkTest(void)
 {
     LoadOam();
     ProcessSpriteCopyRequests();
-    copy_pal_bg_faded_to_pal_ram();
+    TransferPlttBuffer();
 }
 
 static void InitLink(void)
@@ -406,7 +404,7 @@ static void LinkTestProcessKeyInput(void)
     if (gMain.heldKeys & B_BUTTON)
         InitBlockSend(unk_2004000, 0x2004);
     if (gMain.newKeys & L_BUTTON)
-        pal_fade_maybe(-1, 0, 0x10, 0, 2);
+        BeginNormalPaletteFade(-1, 0, 0x10, 0, 2);
     if (gMain.newKeys & START_BUTTON)
         SetSuppressLinkErrorMessage(TRUE);
     if (gMain.newKeys & R_BUTTON)
@@ -430,7 +428,7 @@ static void CB2_LinkTest(void)
     RunTasks();
     AnimateSprites();
     BuildOamBuffer();
-    fade_and_return_progress_probably();
+    UpdatePaletteFade();
 }
 
 u16 LinkMain2(u16 *heldKeys)
@@ -1222,7 +1220,7 @@ void CB2_LinkError(void)
 {
     ResetSpriteData();
     FreeAllSpritePalettes();
-    pal_fade_control_reset_maybe();
+    ResetPaletteFadeControl();
     FillPalette(0, 0, 2);
     ResetTasks();
     SetVBlankCallback(VBlankCB_LinkTest);
@@ -1239,7 +1237,7 @@ void CB2_LinkError(void)
     RunTasks();
     AnimateSprites();
     BuildOamBuffer();
-    fade_and_return_progress_probably();
+    UpdatePaletteFade();
     SetMainCallback2(CB2_PrintErrorMessage);
 }
 
diff --git a/src/palette.c b/src/palette.c
new file mode 100644
index 000000000..8ebbae68b
--- /dev/null
+++ b/src/palette.c
@@ -0,0 +1,819 @@
+#include "global.h"
+#include "palette.h"
+
+enum
+{
+    NORMAL_FADE,
+    FAST_FADE,
+    HARDWARE_FADE,
+};
+
+// These are structs for some unused palette system.
+// The full functionality of this system is unknown.
+
+struct PaletteStructTemplate
+{
+    u16 uid;
+    u16 *src;
+    u16 pst_field_8_0:1;
+    u16 pst_field_8_1:9;
+    u16 size:5;
+    u16 pst_field_9_7:1;
+    u8 pst_field_A;
+    u8 srcCount:5;
+    u8 pst_field_B_5:3;
+    u8 pst_field_C;
+};
+
+struct PaletteStruct
+{
+    struct PaletteStructTemplate *base;
+    u32 ps_field_4_0:1;
+    u16 ps_field_4_1:1;
+    u32 baseDestOffset:9;
+    u16 destOffset:10;
+    u16 srcIndex:7;
+    u8 ps_field_8;
+    u8 ps_field_9;
+};
+
+extern void sub_800D238(const void *src, void *dest);
+extern void BlendPalette(u16, u16, u8, u16);
+
+extern struct PaletteStruct gPaletteStructs[];
+
+extern struct PaletteStructTemplate gDummyPaletteStructTemplate;
+
+static void unused_sub_8073DFC(struct PaletteStruct *, u32 *);
+static void unused_sub_8073F60(struct PaletteStruct *, u32 *);
+static void unused_sub_8074020(struct PaletteStruct *);
+static u8 GetPaletteNumByUid(u16);
+static u8 UpdateNormalPaletteFade(void);
+static void BeginFastPaletteFadeInternal(u8);
+static u8 UpdateFastPaletteFade(void);
+static u8 UpdateHardwarePaletteFade(void);
+static void UpdateBlendRegisters(void);
+static bool8 IsSoftwarePaletteFadeFinishing(void);
+
+void LoadCompressedPalette(const void *src, u16 offset, u16 size)
+{
+    sub_800D238(src, gPaletteDecompressionBuffer);
+    CpuCopy16(gPaletteDecompressionBuffer, gPlttBufferUnfaded + offset, size);
+    CpuCopy16(gPaletteDecompressionBuffer, gPlttBufferFaded + offset, size);
+}
+
+void LoadPalette(const void *src, u16 offset, u16 size)
+{
+    CpuCopy16(src, gPlttBufferUnfaded + offset, size);
+    CpuCopy16(src, gPlttBufferFaded + offset, size);
+}
+
+void FillPalette(u16 value, u16 offset, u16 size)
+{
+    CpuFill16(gPlttBufferUnfaded + offset, value, size);
+    CpuFill16(gPlttBufferFaded + offset, value, size);
+}
+
+void TransferPlttBuffer(void)
+{
+    if (!gPaletteFade.bufferTransferDisabled)
+    {
+        void *src = gPlttBufferFaded;
+        void *dest = (void *)PLTT;
+        DmaCopy16(3, src, dest, PLTT_SIZE);
+        gPlttBufferTransferPending = 0;
+        if (gPaletteFade.mode == HARDWARE_FADE && gPaletteFade.active)
+            UpdateBlendRegisters();
+    }
+}
+
+u8 UpdatePaletteFade(void)
+{
+    u8 result;
+    u8 dummy = 0;
+ 
+    if (gPlttBufferTransferPending)
+        return -1;
+
+    if (gPaletteFade.mode == NORMAL_FADE)
+        result = UpdateNormalPaletteFade();
+    else if (gPaletteFade.mode == FAST_FADE)
+        result = UpdateFastPaletteFade();
+    else
+        result = UpdateHardwarePaletteFade();
+
+    gPlttBufferTransferPending = gPaletteFade.multipurpose1 | dummy;
+
+    return result;
+}
+
+void ResetPaletteFade(void)
+{
+    u8 i;
+
+    for (i = 0; i < 16; i++)
+        ResetPaletteStruct(i);
+
+    ResetPaletteFadeControl();
+}
+
+void ReadPlttIntoBuffers(void)
+{
+    u16 i;
+    u16 *pltt = (u16 *)PLTT;
+
+    for (i = 0; i < PLTT_SIZE / 2; i++)
+    {
+        gPlttBufferUnfaded[i] = pltt[i];
+        gPlttBufferFaded[i] = pltt[i];
+    }
+}
+
+bool8 BeginNormalPaletteFade(u32 selectedPalettes, s8 delay, u8 startY, u8 targetY, u16 blendColor)
+{
+    u8 temp;
+    register u32 _blendColor asm("r8") = blendColor;
+
+    if (gPaletteFade.active)
+    {
+        return FALSE;
+    }
+    else
+    {
+        gPaletteFade.deltaY = 2;
+
+        if (delay < 0)
+        {
+            gPaletteFade.deltaY += (delay * -1);
+            delay = 0;
+        }
+
+        gPaletteFade_selectedPalettes = selectedPalettes;
+        gPaletteFade.delayCounter = delay;
+        gPaletteFade_delay = delay;
+        gPaletteFade.y = startY;
+        gPaletteFade.targetY = targetY;
+        gPaletteFade.blendColor = _blendColor;
+        gPaletteFade.active = 1;
+        gPaletteFade.mode = NORMAL_FADE;
+
+        if (startY < targetY)
+            gPaletteFade.yDec = 0;
+        else
+            gPaletteFade.yDec = 1;
+
+        UpdatePaletteFade();
+
+        temp = gPaletteFade.bufferTransferDisabled;
+        gPaletteFade.bufferTransferDisabled = 0;
+        CpuCopy32(gPlttBufferFaded, (void *)PLTT, PLTT_SIZE);
+        gPlttBufferTransferPending = 0;
+        if (gPaletteFade.mode == HARDWARE_FADE && gPaletteFade.active)
+            UpdateBlendRegisters();
+        gPaletteFade.bufferTransferDisabled = temp;
+        return TRUE;
+    }
+}
+
+bool8 unref_sub_8073D3C(u32 a1, u8 a2, u8 a3, u8 a4, u16 a5)
+{
+    ReadPlttIntoBuffers();
+    return BeginNormalPaletteFade(a1, a2, a3, a4, a5);
+}
+
+void unref_sub_8073D84(u8 a1, u32 *a2)
+{
+    u8 i;
+
+    for (i = 0; i < 16; i++)
+    {
+        struct PaletteStruct *palstruct = &gPaletteStructs[i];
+        if (palstruct->ps_field_4_0)
+        {
+            if (palstruct->base->pst_field_8_0 == a1)
+            {
+                u8 val1 = palstruct->srcIndex;
+                u8 val2 = palstruct->base->srcCount;
+                if (val1 == val2)
+                {
+                    unused_sub_8074020(palstruct);
+                    if (!palstruct->ps_field_4_0)
+                        continue;
+                }
+                if (palstruct->ps_field_8 == 0)
+                    unused_sub_8073DFC(palstruct, a2);
+                else
+                    palstruct->ps_field_8--;
+
+                unused_sub_8073F60(palstruct, a2);
+            }
+        }
+    }
+}
+
+static void unused_sub_8073DFC(struct PaletteStruct *a1, u32 *a2)
+{
+    s32 srcIndex;
+    s32 srcCount;
+    u8 i = 0;
+    u16 srcOffset = a1->srcIndex * a1->base->size;
+
+    if (!a1->base->pst_field_8_0)
+    {
+        while (i < a1->base->size)
+        {
+            gPlttBufferUnfaded[a1->destOffset] = a1->base->src[srcOffset];
+            gPlttBufferFaded[a1->destOffset] = a1->base->src[srcOffset];
+            i++;
+            a1->destOffset++;
+            srcOffset++;
+        }
+    }
+    else
+    {
+        while (i < a1->base->size)
+        {
+            gPlttBufferFaded[a1->destOffset] = a1->base->src[srcOffset];
+            i++;
+            a1->destOffset++;
+            srcOffset++;
+        }
+    }
+
+    a1->destOffset = a1->baseDestOffset;
+    a1->ps_field_8 = a1->base->pst_field_A;
+    a1->srcIndex++;
+
+    srcIndex = a1->srcIndex;
+    srcCount = a1->base->srcCount;
+
+    if (srcIndex >= srcCount)
+    {
+        if (a1->ps_field_9)
+            a1->ps_field_9--;
+        a1->srcIndex = 0;
+    }
+ 
+    *a2 |= 1 << (a1->baseDestOffset >> 4);
+}
+
+static void unused_sub_8073F60(struct PaletteStruct *a1, u32 *a2)
+{
+    if (gPaletteFade.active && ((1 << (a1->baseDestOffset >> 4)) & gPaletteFade_selectedPalettes))
+    {
+        if (!a1->base->pst_field_8_0)
+        {
+            if (gPaletteFade.delayCounter != gPaletteFade_delay)
+            {
+                BlendPalette(
+                    a1->baseDestOffset,
+                    a1->base->size,
+                    gPaletteFade.y,
+                    gPaletteFade.blendColor);
+            }
+        }
+        else
+        {
+            if (!gPaletteFade.delayCounter)
+            {
+                if (a1->ps_field_8 != a1->base->pst_field_A)
+                {
+                    u32 srcOffset = a1->srcIndex * a1->base->size;
+                    u8 i;
+
+                    for (i = 0; i < a1->base->size; i++)
+                        gPlttBufferFaded[a1->baseDestOffset + i] = a1->base->src[srcOffset + i];
+                }
+            }
+        }
+    }
+}
+
+static void unused_sub_8074020(struct PaletteStruct *a1)
+{
+    if (!a1->ps_field_9)
+    {
+        s32 val = a1->base->pst_field_B_5;
+
+        if (!val)
+        {
+            a1->srcIndex = 0;
+            a1->ps_field_8 = a1->base->pst_field_A;
+            a1->ps_field_9 = a1->base->pst_field_C;
+            a1->destOffset = a1->baseDestOffset;
+        }
+        else
+        {
+            if (val < 0)
+                return;
+            if (val > 2)
+                return;
+            ResetPaletteStructByUid(a1->base->uid);
+        }
+    }
+    else
+    {
+        a1->ps_field_9--;
+    }
+}
+
+void ResetPaletteStructByUid(u16 a1)
+{
+    u8 paletteNum = GetPaletteNumByUid(a1);
+    if (paletteNum != 16)
+        ResetPaletteStruct(paletteNum);
+}
+
+void ResetPaletteStruct(u8 paletteNum)
+{
+    gPaletteStructs[paletteNum].base = &gDummyPaletteStructTemplate;
+    gPaletteStructs[paletteNum].ps_field_4_0 = 0;
+    gPaletteStructs[paletteNum].baseDestOffset = 0;
+    gPaletteStructs[paletteNum].destOffset = 0;
+    gPaletteStructs[paletteNum].srcIndex = 0;
+    gPaletteStructs[paletteNum].ps_field_4_1 = 0;
+    gPaletteStructs[paletteNum].ps_field_8 = 0;
+    gPaletteStructs[paletteNum].ps_field_9 = 0;
+}
+
+void ResetPaletteFadeControl()
+{
+    gPaletteFade.multipurpose1 = 0;
+    gPaletteFade.multipurpose2 = 0;
+    gPaletteFade.delayCounter = 0;
+    gPaletteFade.y = 0;
+    gPaletteFade.targetY = 0;
+    gPaletteFade.blendColor = 0;
+    gPaletteFade.active = 0;
+    gPaletteFade.multipurpose2 = 0; // assign same value twice
+    gPaletteFade.yDec = 0;
+    gPaletteFade.bufferTransferDisabled = 0;
+    gPaletteFade.shouldResetBlendRegisters = 0;
+    gPaletteFade.hardwareFadeFinishing = 0;
+    gPaletteFade.softwareFadeFinishing = 0;
+    gPaletteFade.softwareFadeFinishingCounter = 0;
+    gPaletteFade.objPaletteToggle = 0;
+    gPaletteFade.deltaY = 2;
+}
+
+void unref_sub_8074168(u16 uid)
+{
+    u8 paletteNum = GetPaletteNumByUid(uid);
+    if (paletteNum != 16)
+        gPaletteStructs[paletteNum].ps_field_4_1 = 1;
+}
+
+void unref_sub_8074194(u16 uid)
+{
+    u8 paletteNum = GetPaletteNumByUid(uid);
+    if (paletteNum != 16)
+        gPaletteStructs[paletteNum].ps_field_4_1 = 0;
+}
+
+static u8 GetPaletteNumByUid(u16 uid)
+{
+    u8 i;
+
+    for (i = 0; i < 16; i++)
+        if (gPaletteStructs[i].base->uid == uid)
+            return i;
+
+    return 16;
+}
+
+static u8 UpdateNormalPaletteFade()
+{
+    u16 paletteOffset;
+    u16 selectedPalettes;
+
+    if (!gPaletteFade.active)
+        return 0;
+
+    if (IsSoftwarePaletteFadeFinishing())
+    {
+        return gPaletteFade.active;
+    }
+    else
+    {
+        if (!gPaletteFade.objPaletteToggle)
+        {
+            if (gPaletteFade.delayCounter < gPaletteFade_delay)
+            {
+                gPaletteFade.delayCounter++;
+                return 2;
+            }
+            gPaletteFade.delayCounter = 0;
+        }
+
+        paletteOffset = 0;
+
+        if (!gPaletteFade.objPaletteToggle)
+        {
+            selectedPalettes = gPaletteFade_selectedPalettes;
+        }
+        else
+        {
+            selectedPalettes = gPaletteFade_selectedPalettes >> 16;
+            paletteOffset = 256;
+        }
+
+        while (selectedPalettes)
+        {
+            if (selectedPalettes & 1)
+                BlendPalette(
+                    paletteOffset,
+                    16,
+                    gPaletteFade.y,
+                    gPaletteFade.blendColor);
+            selectedPalettes >>= 1;
+            paletteOffset += 16;
+        }
+
+        gPaletteFade.objPaletteToggle ^= 1;
+
+        if (!gPaletteFade.objPaletteToggle)
+        {
+            if (gPaletteFade.y == gPaletteFade.targetY)
+            {
+                gPaletteFade_selectedPalettes = 0;
+                gPaletteFade.softwareFadeFinishing = 1;
+            }
+            else
+            {
+                s8 val;
+                
+                if (!gPaletteFade.yDec)
+                {
+                    val = gPaletteFade.y;
+                    val += gPaletteFade.deltaY;
+                    if (val > gPaletteFade.targetY)
+                        val = gPaletteFade.targetY;
+                    gPaletteFade.y = val;
+                }
+                else
+                {
+                    val = gPaletteFade.y;
+                    val -= gPaletteFade.deltaY;
+                    if (val < gPaletteFade.targetY)
+                        val = gPaletteFade.targetY;
+                    gPaletteFade.y = val;
+                }
+            }
+        }
+
+        return gPaletteFade.active;
+    }
+}
+
+void InvertPlttBuffer(u32 selectedPalettes)
+{
+    u16 paletteOffset = 0;
+    
+    while (selectedPalettes)
+    {
+        if (selectedPalettes & 1)
+        {
+            u8 i;
+            for (i = 0; i < 16; i++)
+                gPlttBufferFaded[paletteOffset + i] = ~gPlttBufferFaded[paletteOffset + i];
+        }
+        selectedPalettes >>= 1;
+        paletteOffset += 16;
+    }
+}
+
+void TintPlttBuffer(u32 selectedPalettes, s8 r, s8 g, s8 b)
+{
+    u16 paletteOffset = 0;
+    
+    while (selectedPalettes)
+    {
+        if (selectedPalettes & 1)
+        {
+            u8 i;
+            for (i = 0; i < 16; i++)
+            {
+                struct PlttData *data = (struct PlttData *)&gPlttBufferFaded[paletteOffset + i];
+                data->r += r;
+                data->g += g;
+                data->b += b;
+            }
+        }
+        selectedPalettes >>= 1;
+        paletteOffset += 16;
+    }
+}
+
+void UnfadePlttBuffer(u32 selectedPalettes)
+{
+    u16 paletteOffset = 0;
+    
+    while (selectedPalettes)
+    {
+        if (selectedPalettes & 1)
+        {
+            u8 i;
+            for (i = 0; i < 16; i++)
+                gPlttBufferFaded[paletteOffset + i] = gPlttBufferUnfaded[paletteOffset + i];
+        }
+        selectedPalettes >>= 1;
+        paletteOffset += 16;
+    }
+}
+
+void BeginFastPaletteFade(u8 submode)
+{
+    gPaletteFade.deltaY = 2;
+    BeginFastPaletteFadeInternal(submode);
+}
+
+static void BeginFastPaletteFadeInternal(u8 submode)
+{
+    gPaletteFade.y = 31;
+    gPaletteFade_submode = submode & 0x3F;
+    gPaletteFade.active = 1;
+    gPaletteFade.mode = FAST_FADE;
+
+    if (submode == FAST_FADE_IN_FROM_BLACK)
+        CpuFill16(gPlttBufferFaded, RGB_BLACK, PLTT_SIZE);
+
+    if (submode == FAST_FADE_IN_FROM_WHITE)
+        CpuFill16(gPlttBufferFaded, RGB_WHITE, PLTT_SIZE);
+
+    UpdatePaletteFade();
+}
+
+static u8 UpdateFastPaletteFade(void)
+{
+    u16 i;
+    u16 paletteOffsetStart;
+    u16 paletteOffsetEnd;
+    s8 r0;
+    s8 g0;
+    s8 b0;
+    s8 r;
+    s8 g;
+    s8 b;
+    s8 val1;
+    s8 val2;
+
+    if (!gPaletteFade.active)
+        return 0;
+
+    if (IsSoftwarePaletteFadeFinishing())
+        return gPaletteFade.active;
+
+    if (gPaletteFade.objPaletteToggle)
+    {
+        paletteOffsetStart = 256;
+        paletteOffsetEnd = 512;
+    }
+    else
+    {
+        paletteOffsetStart = 0;
+        paletteOffsetEnd = 256;
+    }
+
+    switch (gPaletteFade_submode)
+    {
+    case FAST_FADE_IN_FROM_WHITE:
+        for (i = paletteOffsetStart; i < paletteOffsetEnd; i++)
+        {
+            struct PlttData *unfaded;
+            struct PlttData *faded;
+
+            unfaded = (struct PlttData *)&gPlttBufferUnfaded[i];
+            r0 = unfaded->r;
+            g0 = unfaded->g;
+            b0 = unfaded->b;
+
+            faded = (struct PlttData *)&gPlttBufferFaded[i];
+            r = faded->r - 2;
+            g = faded->g - 2;
+            b = faded->b - 2;
+
+            if (r < r0)
+                r = r0;
+            if (g < g0)
+                g = g0;
+            if (b < b0)
+                b = b0;
+
+            gPlttBufferFaded[i] = r | (g << 5) | (b << 10);
+        }
+        break;
+    case FAST_FADE_OUT_TO_WHTIE:
+        for (i = paletteOffsetStart; i < paletteOffsetEnd; i++)
+        {
+            struct PlttData *data = (struct PlttData *)&gPlttBufferFaded[i];
+            r = data->r + 2;
+            g = data->g + 2;
+            b = data->b + 2;
+
+            if (r > 31)
+                r = 31;
+            if (g > 31)
+                g = 31;
+            if (b > 31)
+                b = 31;
+
+            gPlttBufferFaded[i] = r | (g << 5) | (b << 10);
+        }
+        break;
+    case FAST_FADE_IN_FROM_BLACK:
+        for (i = paletteOffsetStart; i < paletteOffsetEnd; i++)
+        {
+            struct PlttData *unfaded;
+            struct PlttData *faded;
+
+            unfaded = (struct PlttData *)&gPlttBufferUnfaded[i];
+            r0 = unfaded->r;
+            g0 = unfaded->g;
+            b0 = unfaded->b;
+
+            faded = (struct PlttData *)&gPlttBufferFaded[i];
+            r = faded->r + 2;
+            g = faded->g + 2;
+            b = faded->b + 2;
+
+            if (r > r0)
+                r = r0;
+            if (g > g0)
+                g = g0;
+            if (b > b0)
+                b = b0;
+
+            gPlttBufferFaded[i] = r | (g << 5) | (b << 10);
+        }
+        break;
+    case FAST_FADE_OUT_TO_BLACK:
+        for (i = paletteOffsetStart; i < paletteOffsetEnd; i++)
+        {
+            struct PlttData *data = (struct PlttData *)&gPlttBufferFaded[i];
+            r = data->r - 2;
+            g = data->g - 2;
+            b = data->b - 2;
+
+            if (r < 0)
+                r = 0;
+            if (g < 0)
+                g = 0;
+            if (b < 0)
+                b = 0;
+
+            gPlttBufferFaded[i] = r | (g << 5) | (b << 10);
+        }
+    }
+
+    gPaletteFade.objPaletteToggle ^= 1;
+
+    if (gPaletteFade.objPaletteToggle)
+        return gPaletteFade.active;
+
+    if (gPaletteFade.y - gPaletteFade.deltaY < 0)
+        gPaletteFade.y = 0;
+    else
+        gPaletteFade.y -= gPaletteFade.deltaY;
+
+    if (gPaletteFade.y == 0)
+    {
+        switch (gPaletteFade_submode)
+        {
+        case FAST_FADE_IN_FROM_WHITE:
+        case FAST_FADE_IN_FROM_BLACK:
+            CpuCopy32(gPlttBufferUnfaded, gPlttBufferFaded, PLTT_SIZE);
+            break;
+        case FAST_FADE_OUT_TO_WHTIE:
+            CpuFill32(gPlttBufferFaded, 0xFFFFFFFF, PLTT_SIZE);
+            break;
+        case FAST_FADE_OUT_TO_BLACK:
+            CpuFill32(gPlttBufferFaded, 0, PLTT_SIZE);
+            break;
+        }
+
+        gPaletteFade.mode = NORMAL_FADE;
+        gPaletteFade.softwareFadeFinishing = 1;
+    }
+
+    return gPaletteFade.active;
+}
+
+void BeginHardwarePaletteFade(u8 blendCnt, u8 delay, u8 y, u8 targetY, u8 shouldResetBlendRegisters)
+{
+    gPaletteFade_blendCnt = blendCnt;
+    gPaletteFade.delayCounter = delay;
+    gPaletteFade_delay = delay;
+    gPaletteFade.y = y;
+    gPaletteFade.targetY = targetY;
+    gPaletteFade.active = 1;
+    gPaletteFade.mode = HARDWARE_FADE;
+    gPaletteFade.shouldResetBlendRegisters = shouldResetBlendRegisters & 1;
+    gPaletteFade.hardwareFadeFinishing = 0;
+
+    if (y < targetY)
+        gPaletteFade.yDec = 0;
+    else
+        gPaletteFade.yDec = 1;
+}
+
+static u8 UpdateHardwarePaletteFade(void)
+{
+    if (!gPaletteFade.active)
+        return 0;
+
+    if (gPaletteFade.delayCounter < gPaletteFade_delay)
+    {
+        gPaletteFade.delayCounter++;
+        return 2;
+    }
+
+    gPaletteFade.delayCounter = 0;
+
+    if (!gPaletteFade.yDec)
+    {
+        gPaletteFade.y++;
+        if (gPaletteFade.y > gPaletteFade.targetY)
+        {
+            gPaletteFade.hardwareFadeFinishing++;
+            gPaletteFade.y--;
+        }
+    }
+    else
+    {
+        s32 y = gPaletteFade.y--;
+        if (y - 1 < gPaletteFade.targetY)
+        {
+            gPaletteFade.hardwareFadeFinishing++;
+            gPaletteFade.y++;
+        }
+    }
+
+    if (gPaletteFade.hardwareFadeFinishing)
+    {
+        if (gPaletteFade.shouldResetBlendRegisters)
+        {
+            gPaletteFade_blendCnt = 0;
+            gPaletteFade.y = 0;
+        }
+        gPaletteFade.shouldResetBlendRegisters = 0;
+    }
+
+    return gPaletteFade.active;
+}
+
+static void UpdateBlendRegisters(void)
+{
+    REG_BLDCNT = gPaletteFade_blendCnt;
+    REG_BLDY = gPaletteFade.y;
+    if (gPaletteFade.hardwareFadeFinishing)
+    {
+        gPaletteFade.hardwareFadeFinishing = 0;
+        gPaletteFade.mode = 0;
+        gPaletteFade_blendCnt = 0;
+        gPaletteFade.y = 0;
+        gPaletteFade.active = 0;
+    }
+}
+
+static bool8 IsSoftwarePaletteFadeFinishing(void)
+{
+    if (gPaletteFade.softwareFadeFinishing)
+    {
+        if (gPaletteFade.softwareFadeFinishingCounter == 4)
+        {
+            gPaletteFade.active = 0;
+            gPaletteFade.softwareFadeFinishing = 0;
+            gPaletteFade.softwareFadeFinishingCounter = 0;
+        }
+        else
+        {
+            gPaletteFade.softwareFadeFinishingCounter++;
+        }
+
+        return TRUE;
+    }
+    else
+    {
+        return FALSE;
+    }
+}
+
+void BlendPalettes(u32 selectedPalettes, u8 coeff, u16 color)
+{
+    u16 paletteOffset;
+
+    for (paletteOffset = 0; selectedPalettes; paletteOffset += 16)
+    {
+        if (selectedPalettes & 1)
+            BlendPalette(paletteOffset, 16, coeff, color);
+        selectedPalettes >>= 1;
+    }
+}
+
+void BlendPalettesUnfaded(u32 selectedPalettes, u8 coeff, u16 color)
+{
+    void *src = gPlttBufferUnfaded;
+    void *dest = gPlttBufferFaded;
+    DmaCopy32(3, src, dest, PLTT_SIZE);
+    BlendPalettes(selectedPalettes, coeff, color);
+}
diff --git a/src/text.c b/src/text.c
index 276a2ccfb..8335e61c8 100644
--- a/src/text.c
+++ b/src/text.c
@@ -3,6 +3,7 @@
 #include "main.h"
 #include "string_util.h"
 #include "songs.h"
+#include "palette.h"
 
 enum
 {
@@ -117,7 +118,6 @@ struct ShiftAmount
     u32 right;
 };
 
-extern void LoadPalette(const u16 *, u16, u32);
 extern void sub_8075474(u16);
 extern void audio_play(u16);
 extern u8 mplay_has_finished_maybe(void);