#if SPECIAL
#include "main.h"
#endif

static void
PostMsg(project_state *State, char *msg)
{
    State->MsgTime = 120;
    State->Msg = msg;
}

static bool32
File_Open(project_data *File, project_state *State, memory *Memory, char *Filename)
{
    SDL_RWops *FileHandle = SDL_RWFromFile(Filename, "r+b");
    if (!FileHandle) {
        return 0;
    }
    uint64 FileSize = SDL_RWseek(FileHandle, 0, RW_SEEK_END);
    void *CompressedData = Memory_PushScratch(Memory, FileSize);
    SDL_RWseek(FileHandle, 0, RW_SEEK_SET);
    IO_ReadFromStream(CompressedData, FileSize, FileHandle);
    SDL_RWclose(FileHandle);
    Data_Decompress(Memory, CompressedData, FileSize, File, 0);
    Memory_PopScratch(Memory, FileSize);

    // Temp sources aren't cleaned out on file close, so we do it here.
    int h = 0, c = 0, i = 0;
    int Count = File->Source_Count;
    while (Block_Loop(Memory, F_Sources, Count, &h, &c, &i)) {
        block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, i);
        if (Source->Type == source_type_principal_temp) {
            Source->Occupied = 0;
            File->Source_Count--;
        }
    }
    String_Copy(State->Filename, State->DummyName, 512);

    File->UI.Shape = {};

    State->Initializing = 4;
    Memory->History.NumberOfEntries = 0;
    Memory->History.EntryPlayhead = 0;
    return 1;
}

static bool32
IO_Save(project_data *File, project_state *State, memory *Memory, char *Filename)
{
    SDL_RWops *TestFile = SDL_RWFromFile(Filename, "wb");

    if (!TestFile)
        return 0;

    uint8 *FileEndAddress = (uint8 *)Memory->Slot[F_PrincipalBitmaps].Address;
    int h = 0, c = 0, i = 0;
    while (Block_Loop(Memory, F_Sources, File->Source_Count, &h, &c, &i)) {
        block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, i);
        if (Source->Type == source_type_principal) {
            uint64 Size = Source->Width * Source->Height * Source->BytesPerPixel;
            void *SourceBitmapAddress = Memory_Block_AddressAtIndex(Memory, F_PrincipalBitmaps, Source->Bitmap_Index, 0);
            uint8 *BitmapEnd = (uint8 *)SourceBitmapAddress + Size;
            if (BitmapEnd > FileEndAddress)
                FileEndAddress = BitmapEnd;
        }
    }

    Assert(FileEndAddress);
    uint64 FileSize = FileEndAddress - (uint8 *)File;

    void *CompressedLocation = Memory_PushScratch(Memory, FileSize);

    uint64 CompressedSize = Data_Compress(Memory, File, FileSize, CompressedLocation, FileSize, Z_BEST_COMPRESSION);

    Memory_PopScratch(Memory, FileSize);

    IO_WriteToStream(CompressedLocation, CompressedSize, TestFile);
    SDL_RWclose(TestFile);

    Memory->IsFileSaved = true;

    return 1;
}

static void
File_SaveAs(project_data *File, project_state *State, memory *Memory, char *Filename)
{
    if (IO_Save(File, State, Memory, State->Filename)) {
        PostMsg(State, "File saved!");
    } else {
        PostMsg(State, "File save failed...");
    }
}

static void
Playhead_Increment(int32 *Frame_Current, int32 Frame_Start, int32 Frame_End, int32 Increment)
{
    *Frame_Current += Increment;
    if (*Frame_Current >= Frame_End) {
        *Frame_Current = Frame_Start;
    }
    // if (*Frame_Current < Frame_Start) {
    // }
}

static uint16
Source_Generate_Blank(project_data *File, project_state *State, memory *Memory, uint16 Width, uint16 Height, uint16 BytesPerPixel)
{
    Assert(File->Source_Count < MAX_SOURCES);
    uint16 Index = Memory_Block_AllocateNew(Memory, F_Sources);
    block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, Index, 0);
    History_Action_Block_Swap(Memory, F_Sources, Source);
    Source->Occupied = 1;
    Source->Width = Width;
    Source->Height = Height;
    Source->BytesPerPixel = BytesPerPixel;
    Source->Type = source_type_principal;
    Source->Bitmap_Index = Memory_Block_PrincipalBitmap_AllocateNew(File, State, Memory);
    Source->Path_String_Index = String_AddToFile(Memory, "test");
    History_Action_Swap(Memory, F_File, sizeof(File->Source_Count), &File->Source_Count);
    File->Source_Count++;
    return Index;
}

static bool32 Source_IsFileSupported(char *Path, bool32 *IsVideo, bool32 *HasAudio) {
    AV_IsFileSupported(Path, IsVideo, HasAudio);
    if (*IsVideo || *HasAudio) {
        return 1;
    } else {
        return stbi_info(Path, NULL, NULL, NULL);
    }
    Assert(0);
    return 0;
}

static void
Source_Delete(project_data *File, memory *Memory, uint32 Index)
{
    block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, Index);
    History_Action_Block_Swap(Memory, F_Sources, Source);
    Source->Occupied = 0;
    History_Action_Swap(Memory, F_File, sizeof(File->Source_Count), &File->Source_Count);
    File->Source_Count--;
}

// These thumbnail textures aren't needed for anything else, so I'm just gonna
// count on GL to retain them in GPU memory.
static void
Source_DumpThumbnail(memory *Memory, block_source *Source, uint32 T_Width, uint32 T_Height)
{
    Assert(Source->Type == source_type_principal_temp);
    void *BitmapAddress = Memory_Block_AddressAtIndex(Memory, F_PrincipalBitmaps, Source->Bitmap_Index, 0);
    uint32 Size = T_Height*T_Width*4;
    uint8 *Output = (uint8 *)Memory_PushScratch(Memory, Size);
    stbir_resize_uint8((uint8 *)BitmapAddress, Source->Width, Source->Height, 0, Output, T_Height, T_Width, 0, 4);

    GL_GenAndBindTexture(&Source->ThumbnailTex, T_Height, T_Width, 4, Output);

    Memory_PopScratch(Memory, Size);
}

static int16
Source_Generate(project_data *File, project_state *State, memory *Memory, void *TempString)
{
    Assert(File->Source_Count < MAX_SOURCES);

    bool32 IsVideo = 0, HasAudio = 0;
    if (Source_IsFileSupported((char *)TempString, &IsVideo, &HasAudio)) {
        uint16 Index = Memory_Block_AllocateNew(Memory, F_Sources);
        block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, Index, 0);
        History_Entry_Commit(Memory, "Add source");
        History_Action_Block_Swap(Memory, F_Sources, Source);

        Source->Occupied = 1;
        Source->Path_String_Index = String_AddToFile(Memory, (char *)TempString);
        Source->Type = source_type_file;
        Source->HasAudio = HasAudio;
        Source->HasVideo = IsVideo;

        History_Action_Swap(Memory, F_File, sizeof(File->Source_Count), &File->Source_Count);
        File->Source_Count++;
        History_Entry_End(Memory);
        return Index;
    } else {
        PostMsg(State, "File not supported...");
    }

    return -1;
}


static void
Property_AddKeyframe(memory *Memory, memory_table_list TableName, property_channel *Property, int Frame, uint16 *ArrayLocation)
{
    History_Entry_Commit(Memory, "Add keyframe");
    bezier_point Point = { 1, {(real32)Frame, Property->CurrentValue, -1, 0, 1, 0}, interpolation_type_linear, 0, {0, 0, 0}, 0 };
    Bezier_Add(Memory, TableName, Property, Point, ArrayLocation);
    History_Entry_End(Memory);
}

static property_channel
Property_InitFloat(real32 Val, real32 ScrubVal, real32 MinVal, real32 MaxVal, bool32 AlwaysInteger) {
    property_channel Property = {};
    Property.CurrentValue = Val;
    Property.MinVal = MinVal;
    Property.MaxVal = MaxVal;
    Property.AlwaysInteger = AlwaysInteger;
    Property.ScrubVal = ScrubVal;
    return Property;
}

static block_composition *
Precomp_Init(project_data *File, memory *Memory, block_composition *DupeComp)
{
    if (File->Comp_Count + 1 > MAX_COMPS) {
        Assert(0);
    }
    block_composition *Comp = (block_composition *)Memory_Block_AllocateAddress(Memory, F_Precomps);
    History_Action_Block_Swap(Memory, F_Precomps, Comp);

    if (DupeComp) {
        *Comp = *DupeComp;
    } else {
        *Comp = {};
    }
    Comp->Occupied = 1;

    Comp->Name_String_Index = Memory_Block_AllocateNew(Memory, F_Strings);
    block_string *String = (block_string *)Memory_Block_AddressAtIndex(Memory, F_Strings, Comp->Name_String_Index, 0);
    sprintf(String->Char, "Comp %i", File->Comp_Count);
    String->Occupied = 1;

    History_Action_Swap(Memory, F_File, sizeof(File->Comp_Count), &File->Comp_Count);
    File->Comp_Count++;
    return Comp;
}

static uint32
Effect_Init(project_state *State, memory *Memory, uint32 EffectEntryIndex, int EffectCount)
{
    uint16 EffectAddressIndex = Memory_Block_AllocateNew(Memory, F_Effects);
    block_effect *Effect = (block_effect *)Memory_Block_AddressAtIndex(Memory, F_Effects, EffectAddressIndex, 0);
    History_Action_Block_Swap(Memory, F_Effects, Effect);
    *Effect = {};
    Effect->Occupied = true;
    header_effect *EffectHeader = &State->Effect[EffectEntryIndex];
    String_Copy(Effect->ID, EffectHeader->ID, 8);
    Effect->IsToggled = true;
    for (int e = 0; e < EffectHeader->Property_Count; e++) {
        Effect->Block_Property_Index[e] = Memory_Block_AllocateNew(Memory, F_Properties);
        property_channel *Property = (property_channel *)Memory_Block_AddressAtIndex(Memory, F_Properties, Effect->Block_Property_Index[e], 0);
        History_Action_Block_Swap(Memory, F_Properties, Property);
        Property->Occupied = true;
        header_property PropertyHeader = State->Property[EffectHeader->PropertyStartIndex + e];
        Property->Identifier = -1;
        Property->CurrentValue = PropertyHeader.DefaultValue;
        Property->MinVal = PropertyHeader.MinVal;
        Property->MaxVal = PropertyHeader.MaxVal;
    }
    return EffectAddressIndex;
}

static void
Effect_Add(project_data *File, project_state *State, memory *Memory, uint32 EffectEntryIndex)
{
    History_Entry_Commit(Memory, "Add effect");
    int h = 0, c = 0, i = 0;
    int Selected = 0;
    while (Block_Loop(Memory, F_Layers, File->Layer_Count, &h, &c, &i))
    {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, i);
        if (Layer->IsSelected & 0x01) {
            Layer->Block_Effect_Index[Layer->Block_Effect_Count] = Effect_Init(State, Memory, EffectEntryIndex, Layer->Block_Effect_Count);
            History_Action_Swap(Memory, F_Layers, sizeof(Layer->Block_Effect_Count), &Layer->Block_Effect_Count);
            Layer->Block_Effect_Count++;
            Selected++;
        }
    }
    History_Entry_End(Memory);
    Assert(Selected);
}

void Source_DeselectAll(project_data *File, memory *Memory)
{
    int h = 0, c = 0, i = 0;
    while (Block_Loop(Memory, F_Sources, File->Source_Count, &h, &c, &i)) {
        block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, i);
        Source->IsSelected = 0;
    }
}


static void
Keyframe_Commit(project_data *File, project_state *State, memory *Memory,
                sorted_comp_array *SortedCompArray, sorted_layer_array *SortedLayerArray,
                sorted_property_array *SortedPropertyStart, uint16 *SortedKeyframeArray)
{
    History_Entry_Commit(Memory, "Move keyframe");
    int h = 0, c = 0, i = 0;
    while (Block_Loop(Memory, F_Layers, File->Layer_Count, &h, &c, &i)) {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, i);
        sorted_layer_array *SortedLayerStart = Sorted_GetLayerStart(SortedLayerArray, SortedCompArray, Layer->Block_Composition_Index);
        if ((State->TimelineMode == timeline_mode_graph) && !(Layer->IsSelected & 0x01))
            continue;
        sorted_property_array *InfoLocation = SortedPropertyStart + SortedLayerStart->SortedPropertyStart;
        uint16 *ArrayLocation = SortedKeyframeArray + SortedLayerStart->SortedKeyframeStart;
        int h = 0, c = 0, p = 0;
        property_channel *Property = NULL;
        block_effect *Effect = NULL;
        while (Layer_LoopChannels(State, Memory, &InfoLocation, &ArrayLocation, Layer, &Property, &Effect, &h, &c, &p))
        {
            if ((State->TimelineMode != timeline_mode_graph) && !Property->IsToggled)
                continue;
            for (int p = 0; p < Property->Keyframe_Count; p++) {
                int k = ArrayLocation[p];
                bezier_point *PointAddress = Bezier_LookupAddress(Memory, Property, k);
                if (PointAddress->IsSelected) {
                    v2 NewPos[3];
                    Bezier_Interact_Evaluate(State, PointAddress, NewPos);
                    History_Action_Swap(Memory, F_Bezier, sizeof(PointAddress->Pos), &PointAddress->Pos);
                    PointAddress->Pos[0] = NewPos[0];
                    PointAddress->Pos[1] = NewPos[1];
                    PointAddress->Pos[2] = NewPos[2];
                }
            }
        }
    }
    History_Entry_End(Memory);
    State->Interact_Offset[0] = 0;
    State->Interact_Offset[1] = 0;
    State->Interact_Offset[2] = 0;
    State->Interact_Offset[3] = 0;
    State->Interact_Active = interact_type_none;
    State->Interact_Modifier = 0;
}

// NOTE(fox): This won't work with precomps!

void Clipboard_Paste(project_data *File, project_state *State, memory *Memory, sorted_comp_array *SortedCompStart, sorted_layer_array *SortedLayerStart, uint16 *SortedKeyframeArray)
{
    clipboard_contents *Contents = (clipboard_contents *)State->ClipboardBuffer;
    if (Contents->Type == selection_type_none)
        return;
    uint64 ClipboardPos = sizeof(clipboard_contents);
    ClipboardPos = sizeof(clipboard_contents);
    int i = SortedCompStart->LayerCount - 1;
    block_layer *Layer = NULL;
    clipboard_channel *Channel;
    int b = 0;
    int LayerCount = 0;

    int NumberOfLayersFromClipboard = 1;
    int LastOffset = 0;
    for (int a = 0; a < Contents->ChannelCount; a++) {
        Channel = &Contents->Channel[a];
        if (a != 0) {
            if (Channel->LayerOffset != LastOffset)
                NumberOfLayersFromClipboard++;
        }
        LastOffset = Channel->LayerOffset;
    }

    for (;;) {
        Channel = &Contents->Channel[b];
        while (i >= 0)
        {
            sorted_layer_array SortEntry = SortedLayerStart[i];
            uint32 Index_Physical = SortEntry.Block_Layer_Index;
            block_layer *TestLayer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, i);
            if (TestLayer->IsSelected & 0x01) {
                Layer = TestLayer;
                break;
            }
            i--;
        }
        if (Layer == NULL)
            break;
        // NOTE(fox): This loop assumes all layers and the clipboard have
        // channels laid out in the same way!
        Assert(0);
        /*
        for (int h = 0; h < AmountOf(Layer->Property); h++) {
            property_channel *Property = &Layer->Property[h];
            if (Property->Name == Channel->Name) {
                for (int p = 0; p < Channel->KeyframeCount; p++) {
                    bezier_point PointData = *(bezier_point *)((uint8 *)State->ClipboardBuffer + ClipboardPos);
                    PointData.Pos[0].x += State->Frame_Current;
                    uint16 *ArrayLocation = Property_GetSortedArray(SortedKeyframeArray, i, h);
                    Bezier_Add(Memory, F_Layers, Property, PointData, ArrayLocation);
                    ClipboardPos += sizeof(bezier_point);
                }
                b++;
                Channel = &Contents->Channel[b];
            }
        }
        Layer = NULL;
        if (b < Contents->ChannelCount) {
            if (NumberOfLayersFromClipboard != 1)
                break;
            else
                b = 0;
        }
        */
    }
}

void Clipboard_Store(project_data *File, project_state *State, memory *Memory, sorted_comp_array *SortedCompStart, sorted_layer_array *SortedLayerStart, sorted_property_array *SortedPropertyStart, uint16 *SortedKeyframeArray)
{
    int LocalOffset = 0;
    clipboard_contents *Contents = (clipboard_contents *)State->ClipboardBuffer;
    *Contents = {};
    Contents->Type = State->RecentSelectionType;
    uint64 ClipboardPos = sizeof(clipboard_contents);
    if (Contents->Type == selection_type_none)
        return;
    else if (Contents->Type == selection_type_keyframe) {
        for (int i = SortedCompStart->LayerCount - 1; i >= 0; i--)
        {
            sorted_layer_array SortEntry = SortedLayerStart[i];
            uint32 Index_Physical = SortEntry.Block_Layer_Index;
            block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
            for (int h = 0; h < AmountOf(Layer->Property); h++) {
                property_channel *Property = &Layer->Property[h];
                if (Property->IsToggled || (Layer->IsSelected & 0x01)) {
                    sorted_property_array *InfoLocation = Property_GetSortedInfo(SortedPropertyStart, i, h);
                    uint16 *ArrayLocation = Property_GetSortedArray(SortedKeyframeArray, i, h);
                    clipboard_channel *Channel = &Contents->Channel[Contents->ChannelCount];
                    bezier_point *FirstPoint = NULL;
                    int TimeOffset = 0;
                    for (int p = 0; p < Property->Keyframe_Count; p++) {
                        bezier_point *PointAddress = Bezier_LookupAddress(Memory, Property, ArrayLocation[p]);
                        if (PointAddress->IsSelected) {
                            if (!FirstPoint) {
                                FirstPoint = PointAddress;
                                TimeOffset = FirstPoint->Pos[0].x;
                            }
                            bezier_point PointToCopy = *PointAddress;
                            PointToCopy.Pos[0].x -= TimeOffset;
                            Memory_Copy((uint8 *)State->ClipboardBuffer + ClipboardPos, (uint8 *)&PointToCopy, sizeof(bezier_point));
                            ClipboardPos += sizeof(bezier_point);
                            Channel->KeyframeCount++;
                        }
                    }
                    if (Channel->KeyframeCount) {
                        if (!LocalOffset)
                            LocalOffset = i;
                        Contents->ChannelCount++;
                        Channel->LayerOffset = LocalOffset - i;
                        Assert(0);
                        // Channel->Name = Property->Name;
                    }
                }
            }
        }
    }
    else if (Contents->Type == selection_type_layer) {
    }
}

void Slide_Init(project_data *File, project_state *State, memory *Memory)
{
    // It's impossible to use the brush while this is active, so for now we can
    // just use its buffer to store our data:
    uint8 *InteractBuffer = (uint8 *)State->Brush.TransientBitmap;
    State->Interact_Count = 0;
    int h = 0, c = 0, i = 0;
    while (Block_Loop(Memory, F_Layers, File->Layer_Count, &h, &c, &i)) {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, i);
        if (Layer->IsSelected & 0x01) {
            interact_slide_layer *Interact_Layer = (interact_slide_layer *)InteractBuffer;
            *Interact_Layer = {0};
            Interact_Layer->Index = i;
            InteractBuffer += sizeof(interact_slide_layer);
            State->Interact_Count++;
        }
    }
}

void Slide_Test(project_data *File, project_state *State, memory *Memory, sorted_comp_array *SortedCompArray, sorted_layer_array *SortedLayerArray)
{
    block_composition *MainComp = (block_composition *)Memory_Block_AddressAtIndex(Memory, F_Precomps, File->PrincipalCompIndex);
    v2 CompDimensions = V2(MainComp->Width, MainComp->Height);
    real32 Threshold = 10;
    uint8 *InteractBuffer = (uint8 *)State->Brush.TransientBitmap;
    for (int i = 0; i < State->Interact_Count; i++) {
        interact_slide_layer *Interact_Layer = (interact_slide_layer *)InteractBuffer;
        InteractBuffer += sizeof(interact_slide_layer);
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Interact_Layer->Index);
        v2 CompUV = V2(State->Interact_Offset[0], State->Interact_Offset[1]);
        v2 CompPos = CompUV * CompDimensions;
        // v2 LayerPos = Layer_TraverseForPoint(File, State, Memory, CompUV, SortedCompArray, SortedLayerArray, Interact_Layer->Index);
        v2 LayerPos = V2(Layer->x.CurrentValue, Layer->y.CurrentValue);
        int Width, Height;
        Layer_GetDimensions(Memory, Layer, &Width, &Height);
        v2 Difference = V2(fabs(CompPos.x - LayerPos.x), fabs(CompPos.y - LayerPos.y));
        printf("Diff: %.1f, %.1f\n", Difference.x, Difference.y);
        if (Difference.x < Threshold && 
            Difference.y < Threshold)
            Assert(0);
    }
}

void Property_MinMax_X(memory *Memory, project_state *State, property_channel *Property,
                       uint16 *ArrayLocation, real32 *Min, real32 *Max)
{
    v2 FirstPointPos[3];
    bezier_point *FirstPointAddress = Bezier_LookupAddress(Memory, Property, ArrayLocation[0]);
    Bezier_Interact_Evaluate(State, FirstPointAddress, FirstPointPos);
    *Min = FirstPointPos[0].x;
    v2 LastPointPos[3];
    bezier_point *LastPointAddress =  Bezier_LookupAddress(Memory, Property, ArrayLocation[Property->Keyframe_Count - 1]);
    Bezier_Interact_Evaluate(State, LastPointAddress, LastPointPos);
    *Max = LastPointPos[0].x;
}
void Property_MinMax_Y(memory *Memory, project_state *State, property_channel *Property,
                       sorted_property_array *PropertyStart, real32 *Min, real32 *Max, bool32 Evaluate)
{
    if (Evaluate) {
        v2 MinYPointPos[3];
        bezier_point *MinYPointAddress =  Bezier_LookupAddress(Memory, Property, PropertyStart->MinYIndex);
        Bezier_Interact_Evaluate(State, MinYPointAddress, MinYPointPos);
        *Min = MinYPointPos[0].y;
        v2 MaxYPointPos[3];
        bezier_point *MaxYPointAddress =  Bezier_LookupAddress(Memory, Property, PropertyStart->MaxYIndex);
        Bezier_Interact_Evaluate(State, MaxYPointAddress, MaxYPointPos);
        *Max = MaxYPointPos[0].y;
    } else {
        bezier_point *MinYPointAddress =  Bezier_LookupAddress(Memory, Property, PropertyStart->MinYIndex);
        *Min = MinYPointAddress->Pos[0].y;
        bezier_point *MaxYPointAddress =  Bezier_LookupAddress(Memory, Property, PropertyStart->MaxYIndex);
        *Max = MaxYPointAddress->Pos[0].y;
    }
}

inline property_channel *
Effect_Property(memory *Memory, block_effect *Effect, int Offset)
{
    return (property_channel *)Memory_Block_AddressAtIndex(Memory, F_Properties, Effect->Block_Property_Index[Offset]);
};

inline v2 Effect_V2(memory *Memory, block_effect *Effect, int Offset)
{
    property_channel *Property_X = (property_channel *)Memory_Block_AddressAtIndex(Memory, F_Properties, Effect->Block_Property_Index[Offset]);
    property_channel *Property_Y = (property_channel *)Memory_Block_AddressAtIndex(Memory, F_Properties, Effect->Block_Property_Index[Offset + 1]);
    return V2(Property_X->CurrentValue, Property_Y->CurrentValue);
}

// TODO(fox): Merge with other sorting code.
void Effect_Curves_Sort(memory *Memory, block_effect *Effect, uint16 *SortedPointStart, uint16 Which)
{
    int i = 0;
    int SortedPoints = 0;
    for (;;) {
        property_channel *CurrentProperty = (property_channel *)Memory_Block_AddressAtIndex(Memory, F_Properties, Effect->Block_Property_Index[i]);
        v2 Point = Effect_V2(Memory, Effect, i);
        uint32 SortedIndex_Playhead = 0;
        if (CurrentProperty->Identifier == Which) {
            while (SortedIndex_Playhead < SortedPoints) {
                uint16 TestPointEntry = SortedPointStart[SortedIndex_Playhead];
                Assert(((property_channel *)Memory_Block_AddressAtIndex(Memory, F_Properties, Effect->Block_Property_Index[TestPointEntry]))->Identifier == Which);
                v2 TestPoint = Effect_V2(Memory, Effect, TestPointEntry);
                if (Point.x < TestPoint.x) {
                    break;
                } else {
                    SortedIndex_Playhead += 1;
                }
            }
            if (SortedIndex_Playhead != SortedPoints) {
                uint8 *Address_Start = (uint8 *)(SortedPointStart + SortedIndex_Playhead);
                uint8 *Address_End = (uint8 *)(SortedPointStart + SortedPoints) - 1;
                Arbitrary_ShiftData(Address_Start, Address_End, sizeof(uint16), 1);
            }

            uint16 *PointEntry = SortedPointStart + SortedIndex_Playhead;
            *PointEntry = i;
            SortedPoints++;
        }
        i += 2;
        if (i > (MAX_PROPERTIES_PER_EFFECT - 1))
            break;
    }
}

static void
Layer_Nudge(project_data *File, project_state *State, memory *Memory, 
            sorted_comp_array *SortedCompArray, sorted_layer_array *SortedLayerArray)
{
    sorted_comp_array SortedCompStart = SortedCompArray[File->PrincipalCompIndex];
    sorted_layer_array *SortedLayerStart = Sorted_GetLayerStart(SortedLayerArray, SortedCompArray, File->PrincipalCompIndex);
    State->Interact_Active = interact_type_layer_move;
    State->Interact_Offset[0] = -1;
    History_Entry_Commit(Memory, "Move layer stack down");
    for (int i = 0; i < SortedCompStart.LayerCount; i++)
    {
        sorted_layer_array SortEntry = SortedLayerStart[i];
        uint32 Index_Physical = SortEntry.Block_Layer_Index;
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
        // NOTE(fox): Some data on the tree could be saved here.
        History_Action_Swap(Memory, F_Layers, sizeof(Layer->Vertical_Offset), &Layer->Vertical_Offset);
        Layer->Vertical_Offset = SortEntry.SortedOffset;
        if (Layer->IsSelected & 0x01) {
            History_Action_Swap(Memory, F_Layers, sizeof(Layer->Frame_Offset), &Layer->Frame_Offset);
            Interact_Evaluate_Layer(Memory, State, Index_Physical, SortedCompStart, SortedLayerStart, &Layer->Frame_Start, &Layer->Frame_End, &Layer->Frame_Offset);
        }
    }
    State->Interact_Active = interact_type_none;
    State->Interact_Modifier = 0;
    History_Entry_End(Memory);
}

static void
Interact_Evaluate_Layer(memory *Memory, project_state *State, uint16 Layer_Index_Physical, sorted_comp_array SortedCompStart, sorted_layer_array *SortedLayerStart,
                        int32 *Frame_Start, int32 *Frame_End, int *Frame_Offset)
{
    if (State->Interact_Active == interact_type_layer_move) {
        *Frame_Offset += (int32)(State->Interact_Offset[0] + 0);
    }
    if (State->Interact_Active == interact_type_layer_timeadjust) {
        int Side[2] = {0};
        Assert(State->Interact_Offset[1] == 0 || State->Interact_Offset[1] == 1);
        Side[(int)State->Interact_Offset[1]] = 1;
        *Frame_Start += (int32)(State->Interact_Offset[0] * Side[0]);
        if (*Frame_Start >= *Frame_End)
            *Frame_Start = *Frame_End - 1;
        *Frame_End += (int32)(State->Interact_Offset[0] * Side[1]);
        if (*Frame_End <= *Frame_Start)
            *Frame_End = *Frame_Start + 1;
    }
}

void File_DeselectAllKeyframes(project_data *File, project_state *State, memory *Memory,
                          sorted_comp_array *SortedCompArray, sorted_layer_array *SortedLayerArray,
                          sorted_property_array *SortedPropertyStart, uint16 *SortedKeyframeArray)
{
    int h = 0, c = 0, i = 0;
    while (Block_Loop(Memory, F_Layers, File->Layer_Count, &h, &c, &i)) {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, i);
        if (!(Layer->IsSelected & 0x01))
            continue;
        sorted_layer_array *SortedLayerStart = Sorted_GetLayerStart(SortedLayerArray, SortedCompArray, Layer->Block_Composition_Index);
        sorted_property_array *InfoLocation = SortedPropertyStart + SortedLayerStart->SortedPropertyStart;
        uint16 *ArrayLocation = SortedKeyframeArray + SortedLayerStart->SortedKeyframeStart;
        int h = 0, c = 0, p = 0;
        property_channel *Property = NULL;
        block_effect *Effect = NULL;
        while (Layer_LoopChannels(State, Memory, &InfoLocation, &ArrayLocation, Layer, &Property, &Effect, &h, &c, &p))
        {
            for (int p = 0; p < Property->Keyframe_Count; p++) {
                int k = ArrayLocation[p];
                bezier_point *PointAddress = Bezier_LookupAddress(Memory, Property, k);
                PointAddress->IsSelected = 0;
            }
        }
    }
}


static void
Project_Layer_Delete(project_data *File, project_state *State, memory *Memory)
{
    bool32 CommitAction = 0;
    int h = 0, c = 0, i = 0;
    int LayerCount = File->Layer_Count;
    while (Block_Loop(Memory, F_Layers, LayerCount, &h, &c, &i)) {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, i);
        if (Layer->IsSelected & 0x01) {
            if (!CommitAction) {
                History_Entry_Commit(Memory, "Delete layer");
                CommitAction = 1;
            }
            Layer_Delete(File, State, Memory, i);
        }
    }
    if (CommitAction) {
        History_Entry_End(Memory);
        State->UpdateFrame = true;
        State->MostRecentlySelectedLayer = -1;
    }
}

static bool32
Property_IsGraphSelected(memory *Memory, property_channel *Property, uint16 *ArrayLocation)
{
    for (int p = 0; p < Property->Keyframe_Count; p++) {
        int k = ArrayLocation[p];
        bezier_point *Point = Bezier_LookupAddress(Memory, Property, k);
        if (Point->IsSelected)
            return 1;
    }
    return 0;
}

// TODO(fox): It seems like duping many layers at once causes this to take up
// exponentially more data on the undo tree than it should. Rewrite the loop to
// change the offsets before duping, taking into account all dupes, like what
// the sorting code does.
// TODO(fox): Add different modes (all dupes on top, each dupe above its layer, two for bottom)
static void
Sort_OffsetDupes(memory *Memory, sorted_layer_array *SortedLayerStart, block_layer *StartLayer, 
                 int i, int FauxIncrement, int LayerCount, int Mode)
{
    block_layer *PrevLayer = StartLayer;
    for (int a = i+1; a < LayerCount; a++) {
        sorted_layer_array *NextSortEntry = &SortedLayerStart[a];
        uint32 NextIndex_Physical = NextSortEntry->Block_Layer_Index;
        block_layer *NextLayer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, NextIndex_Physical);
        if (NextLayer->Vertical_Offset == PrevLayer->Vertical_Offset) {
            if (Mode == 0 && !NextSortEntry->IsFake) {
                History_Action_Swap(Memory, F_Layers, sizeof(NextLayer->Vertical_Offset), &NextLayer->Vertical_Offset);
                NextLayer->Vertical_Offset -= 1;
            } else {
                NextSortEntry->SortedOffset -= 1;
            }
        } else {
            break;
        }
        PrevLayer = NextLayer;
    }
}

// NOTE(fox): PrecompLayer is assumed to be untouched from the layer it was duplicated from!
static uint16
Layer_Precomp_CopyContents(project_data *File, project_state *State, memory *Memory, block_layer *PrecompLayer, 
                           sorted_comp_array *SortedCompArray, sorted_layer_array *SortedLayerArray)
{
    Assert(PrecompLayer->IsPrecomp);
    int CompIndex = PrecompLayer->Block_Source_Index;
    sorted_comp_array SortedCompStart = SortedCompArray[CompIndex];
    sorted_layer_array *SortedLayerStart = Sorted_GetLayerStart(SortedLayerArray, SortedCompArray, CompIndex);
    int LayerCount = SortedCompStart.LayerCount;
    Assert(SortedCompStart.FakeLayerCount == 0);

    block_composition *Comp = (block_composition *)Memory_Block_AddressAtIndex(Memory, F_Precomps, CompIndex);
    block_composition *NewPrecomp = Precomp_Init(File, Memory, Comp);
    uint16 NewCompIndex = Memory_Block_LazyIndexAtAddress(Memory, F_Precomps, NewPrecomp);

    for (int i = 0; i < LayerCount; i++) 
    {
        sorted_layer_array SortEntry = SortedLayerStart[i];
        uint32 Index_Physical = SortEntry.Block_Layer_Index;
        block_layer *NewLayer = NULL;
        {
            block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
            Assert(!(Layer->IsSelected & 0x01));
            NewLayer = (block_layer *)Memory_Block_AllocateAddress(Memory, F_Layers);
            History_Action_Block_Swap(Memory, F_Layers, NewLayer);
            *NewLayer = *Layer;
        }

        NewLayer->Block_Composition_Index = NewCompIndex;

        // TODO(fox): Effect duplication
        Assert(NewLayer->Block_Effect_Count == 0);

        block_string *OldString = (block_string *)Memory_Block_AddressAtIndex(Memory, F_Strings, NewLayer->Block_String_Index);

        NewLayer->Block_String_Index = Memory_Block_AllocateNew(Memory, F_Strings);
        block_string *String = (block_string *)Memory_Block_AddressAtIndex(Memory, F_Strings, NewLayer->Block_String_Index, 0);
        sprintf(String->Char, "%s", OldString->Char);
        History_Action_Swap(Memory, F_Strings, sizeof(String->Occupied), &String->Occupied);
        String->Occupied = 1;

        History_Action_Swap(Memory, F_File, sizeof(File->Layer_Count), &File->Layer_Count);
        File->Layer_Count++;
    }

    return NewCompIndex;
}

static void
Project_Layer_Duplicate(project_data *File, project_state *State, memory *Memory,
                        sorted_comp_array *SortedCompArray, sorted_layer_array *SortedLayerArray, v2 Offset, bool32 FakeOnly, bool32 NewPrecomp)
{
    for (int c = 0; c < File->Comp_Count; c++) {
        sorted_comp_array SortedCompStart = SortedCompArray[c];
        sorted_layer_array *SortedLayerStart = Sorted_GetLayerStart(SortedLayerArray, SortedCompArray, c);
        int LayerCount = SortedCompStart.LayerCount + SortedCompStart.FakeLayerCount;
        for (int i = 0; i < LayerCount; i++) 
        {
            sorted_layer_array SortEntry = SortedLayerStart[i];
            uint32 Index_Physical = SortEntry.Block_Layer_Index;
            block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
            if ((FakeOnly && SortEntry.IsFake) || (!FakeOnly && (Layer->IsSelected & 0x01)))
            {
                if (!FakeOnly)
                    Layer->IsSelected = 0x00;

                block_layer *NewLayer = (block_layer *)Memory_Block_AllocateAddress(Memory, F_Layers);
                History_Action_Block_Swap(Memory, F_Layers, NewLayer);
                *NewLayer = *Layer;

                if (NewPrecomp && Layer->IsPrecomp) {
                    NewLayer->Block_Source_Index = Layer_Precomp_CopyContents(File, State, Memory, NewLayer, SortedCompArray, SortedLayerArray);
                }

                // TODO(fox): Effect duplication
                Assert(Layer->Block_Effect_Count == 0);

                Layer_Select(Memory, State, Memory_Block_LazyIndexAtAddress(Memory, F_Layers, NewLayer));
                NewLayer->Vertical_Offset--;

                Sort_OffsetDupes(Memory, SortedLayerStart, NewLayer, i, 0, LayerCount, 0);
    
                Assert(!NewLayer->x.Keyframe_Count);
                Assert(!NewLayer->y.Keyframe_Count);
                NewLayer->x.CurrentValue += Offset.x;
                NewLayer->y.CurrentValue += Offset.y;
    
                NewLayer->Block_String_Index = Memory_Block_AllocateNew(Memory, F_Strings);
                block_string *String = (block_string *)Memory_Block_AddressAtIndex(Memory, F_Strings, NewLayer->Block_String_Index, 0);
                sprintf(String->Char, "Layer %i", File->Layer_Count + 1);  // CSbros...
                History_Action_Swap(Memory, F_Strings, sizeof(String->Occupied), &String->Occupied);
                String->Occupied = 1;
    
                History_Action_Swap(Memory, F_File, sizeof(File->Layer_Count), &File->Layer_Count);
                File->Layer_Count++;
    
            } else {
                Layer->IsSelected = 0x00;
            }
        }
    }
}

// TODO(fox): We may need a way to recalculate width/height when points are
// moved since selection depends on it. 
// TODO(fox): We could also write better selection code for shapes that
// actually tests using the bezier path (preferrable).

static void
Project_ShapeLayer_New(project_data *File, project_state *State, memory *Memory)
{
    int TopOffset = Layer_GetTopOffset(File, Memory);
    block_composition *MainComp = (block_composition *)Memory_Block_AddressAtIndex(Memory, F_Precomps, File->PrincipalCompIndex);
    Layer_DeselectAll(File, State, Memory);
    History_Entry_Commit(Memory, "New shape layer");
    block_layer *Layer = Layer_Init(File, Memory);
    Layer->IsShapeLayer = true;
    if (File->Layer_Count == 1) {
        Layer->Vertical_Offset = 11 - 1;
    } else {
        Layer->Vertical_Offset = TopOffset - 1;
    }
    Layer->Frame_Start = MainComp->Frame_Start;
    Layer->Frame_End = MainComp->Frame_End;
    Layer_Select(Memory, State, Memory_Block_LazyIndexAtAddress(Memory, F_Layers, Layer));

    shape_layer *Shape = &File->UI.Shape;

    Layer->Block_Composition_Index = File->PrincipalCompIndex;
    if (State->MostRecentlySelectedLayer == -1) {
        Layer->Block_Composition_Index = File->PrincipalCompIndex;
    } else {
        // TODO(fox): Allow shapes to be drawn inside selected precomps?
        // LayerIterate_DeepestPrecomp(State, Memory, CompIndex, ExtraT, Center,
        //                     SortedCompArray, SortedLayerArray, SelectionCount, SelectedLayerIndex, SelectedPrecompIndex)
    }
    // Rect mode
    if (State->ShapeMode == 0) {
        v2 *CompPoint = (v2 *)&State->Interact_Offset[0];
        for (int i = 0; i < 4; i++) {
            bezier_point PointData = { 1, { CompPoint[i], V2(0, 0), V2(0, 0) }, interpolation_type_linear, 0 };
            Bezier_Add(Memory, F_File, Shape->Block_Bezier_Index, &Shape->Block_Bezier_Count, &Shape->Point_Count, PointData);
            CompPoint[i] = {0};
        }
        Shape->IsClosed = true;
    } else if (State->ShapeMode == 1) {
        v2 Radius = *((v2 *)&State->Interact_Offset + 0);
        v2 Center = *((v2 *)&State->Interact_Offset + 1);
        real32 cx = Center.x;
        real32 cy = Center.y;
        real32 rx = Radius.x;
        real32 ry = Radius.y;
        v2 Points[12] = { V2(cx-rx, cy), V2(0, ry*KAPPA),  V2(0, -ry*KAPPA), 
                          V2(cx, cy+ry), V2(+rx*KAPPA, 0), V2(-rx*KAPPA, 0), 
                          V2(cx+rx, cy), V2(0, -ry*KAPPA), V2(0,  ry*KAPPA),   
                          V2(cx, cy-ry), V2(-rx*KAPPA, 0), V2(+rx*KAPPA, 0)  };
        for (int i = 0; i < 4; i++) {
            bezier_point PointData = { 1, { Points[i*3+0], Points[i*3+1], Points[i*3+2] }, interpolation_type_bezier, 0 };
            Bezier_Add(Memory, F_File, Shape->Block_Bezier_Index, &Shape->Block_Bezier_Count, &Shape->Point_Count, PointData);
        }

        // Shape->IsClosed = true;
    }

    shape_options ShapeOpt = File->UI.ShapeOpt;
    ShapeOpt.FillCol = File->UI.Color;
    ShapeOpt.StrokeCol = File->UI.AltColor;
    v2 Min = {}, Max = {};
    void *Data = Memory_PushScratch(Memory, sizeof(nvg_point) * 128);
    layer_transforms T = {};
    bool32 IsConvex = 0;
    NVG_FlattenPath(Memory, Shape, ShapeOpt, (nvg_point *)Data, State, T, 0, 0, 0, 0, 0, &Min, &Max, &IsConvex);
    Memory_PopScratch(Memory, sizeof(nvg_point) * 128);
    Shape->Width =  Max.x - Min.x;
    Shape->Height = Max.y - Min.y;
    for (int i = 0; i < Shape->Point_Count; i++) {
        bezier_point *Point = Bezier_LookupAddress(Memory, Shape->Block_Bezier_Index, i, 1);
        for (int a = 0; a < 3; a++) {
            v2 Sub = (a == 0) ? Min : V2(0, 0);
            Point->Pos[a] = (Point->Pos[a] - Sub) / V2(Shape->Width, Shape->Height);
        }
    }

    Layer->x.CurrentValue = Min.x + (Shape->Width / 2);
    Layer->y.CurrentValue  = Min.y + (Shape->Height / 2);

    /*
    v2 Min = V2(10000, 10000);
    v2 Max = V2(-10000, -10000);
    shape_layer *Shape = &File->UI.Shape;
    for (int i = 0; i < Shape->Point_Count; i++) {
        bezier_point *Point = Bezier_LookupAddress(Memory, Shape->Block_Bezier_Index, i, 1);
        if (Point->Pos[0].x > Max.x)
            Max.x = Point->Pos[0].x;
        if (Point->Pos[0].x < Min.x)
            Min.x = Point->Pos[0].x;
        if (Point->Pos[0].y > Max.y)
            Max.y = Point->Pos[0].y;
        if (Point->Pos[0].y < Min.y)
            Min.y = Point->Pos[0].y;
    }
    v2 ShapeSize = (Max - Min);
    Layer->x.CurrentValue = Min.x + (ShapeSize.x / 2);
    Layer->y.CurrentValue  = Min.y + (ShapeSize.y / 2);
    */

    History_Action_Swap(Memory, F_Layers, sizeof(Layer->Shape), &Layer->Shape);
    Layer->Shape = File->UI.Shape;
    History_Action_Swap(Memory, F_Layers, sizeof(Layer->ShapeOpt), &Layer->ShapeOpt);
    Layer->ShapeOpt = ShapeOpt;
    History_Action_Swap(Memory, F_File, sizeof(File->UI.Shape), &File->UI.Shape);
    File->UI.Shape = {};

    History_Entry_End(Memory);
    State->UpdateFrame = true;
}

static void
Project_PaintLayer_New(project_data *File, project_state *State, memory *Memory)
{
    int TopOffset = Layer_GetTopOffset(File, Memory);
    block_composition *MainComp = (block_composition *)Memory_Block_AddressAtIndex(Memory, F_Precomps, File->PrincipalCompIndex);
    Arbitrary_Zero((uint8 *)State->Brush.TransientBitmap, 2048*2048*4);
    State->Interact_Active = interact_type_brush;
    Layer_DeselectAll(File, State, Memory);
    History_Entry_Commit(Memory, "Paint new layer");
    uint16 i = Source_Generate_Blank(File, State, Memory, MainComp->Width, MainComp->Height, MainComp->BytesPerPixel);
    block_layer *Layer = Layer_Init(File, Memory);
    block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, Layer->Block_Source_Index);
    State->Brush.LayerToPaint_Index = Memory_Block_LazyIndexAtAddress(Memory, F_Layers, (void *)Layer);
    Layer->Block_Source_Index = i;
    Layer->x.CurrentValue = MainComp->Width / 2;
    Layer->y.CurrentValue  = MainComp->Height / 2;
    if (File->Layer_Count == 1) {
        Layer->Vertical_Offset = 11 - 1;
    } else {
        Layer->Vertical_Offset = TopOffset - 1;
    }
    Layer->Frame_Start = MainComp->Frame_Start;
    Layer->Frame_End = MainComp->Frame_End;
    Layer_Select(Memory, State, Memory_Block_LazyIndexAtAddress(Memory, F_Layers, Layer));
    History_Entry_End(Memory);
    State->UpdateFrame = true;
}

void Source_UICreateButton(project_data *File, project_state *State, memory *Memory)
{
    block_composition *Comp = (block_composition *)Memory_Block_AddressAtIndex(Memory, F_Precomps, File->PrincipalCompIndex);
    int TopOffset = Layer_GetTopOffset(File, Memory);
    bool32 CommitAction = 0;
    int h = 0, c = 0, i = 0;
    while (Block_Loop(Memory, F_Sources, File->Source_Count, &h, &c, &i)) {
        block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, i);
        if (Source->IsSelected) {
            if (!CommitAction) {
                History_Entry_Commit(Memory, "Create layer from source");
                CommitAction = 1;
            }
            if (Source->Type == source_type_principal_temp) {
                History_Action_Swap(Memory, F_Sources, sizeof(Source->Type), &Source->Type);
                Source->Type = source_type_principal;
            }
            block_layer *Layer = Layer_Init(File, Memory);
            Layer->Block_Source_Index = i;
            Layer->x.CurrentValue = Comp->Width/2;
            Layer->y.CurrentValue = Comp->Height/2;
            Layer->Vertical_Offset = TopOffset-1;
            Layer->Frame_Start = Comp->Frame_Start;
            Layer->Frame_End = Comp->Frame_End;
            if (Source->HasVideo) {
                av_info *AV = (av_info *)Memory_Block_AllocateAddress(Memory, P_AVInfo);
                AV->Occupied = 1;
                AV->Block_Source_Index = Layer->Block_Source_Index;
                AV_Init(Source, AV, Memory);
                State->AVCount++;
            }
        }
        State->UpdateFrame = true;
    }
    if (CommitAction)
        History_Entry_End(Memory);
    Source_DeselectAll(File, Memory);
}

void Precomp_UIDelete(project_data *File, project_state *State, memory *Memory, uint16 CompIndex,
                           sorted_comp_array SortedCompStart, sorted_layer_array *SortedLayerStart)
{
    block_layer *Layer = NULL;
    for (int i = SortedCompStart.LayerCount - 1; i >= 0; i--)
    {
        sorted_layer_array SortEntry = SortedLayerStart[i];
        uint32 Index_Physical = SortEntry.Block_Layer_Index;
        Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
        if (Layer->IsSelected & 0x01) {
        }
    }
}

void Precomp_UICreateButton(project_data *File, project_state *State, memory *Memory, uint16 CompIndex,
                           sorted_comp_array SortedCompStart, sorted_layer_array *SortedLayerStart)
{
    block_composition *Comp = (block_composition *)Memory_Block_AddressAtIndex(Memory, F_Precomps, CompIndex);
    History_Entry_Commit(Memory, "Pre-compose layer");
    block_composition *NewComp = Precomp_Init(File, Memory);
    NewComp->Width = Comp->Width;
    NewComp->Height = Comp->Height;
    NewComp->FPS = Comp->FPS;
    NewComp->BytesPerPixel = Comp->BytesPerPixel;
    NewComp->Frame_Count = Comp->Frame_Count;
    NewComp->Frame_Start = Comp->Frame_Start;
    NewComp->Frame_End = Comp->Frame_End;
    int32 TopOffset = 0;
    for (int i = SortedCompStart.LayerCount - 1; i >= 0; i--)
    {
        sorted_layer_array SortEntry = SortedLayerStart[i];
        uint32 Index_Physical = SortEntry.Block_Layer_Index;
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
        if (Layer->IsSelected & 0x01) {
            TopOffset = Layer->Vertical_Offset;
            break;
        }
    }
    for (int i = SortedCompStart.LayerCount - 1; i >= 0; i--)
    {
        sorted_layer_array SortEntry = SortedLayerStart[i];
        uint32 Index_Physical = SortEntry.Block_Layer_Index;
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
        if (Layer->IsSelected & 0x01) {
            History_Action_Swap(Memory, F_Layers, sizeof(Layer->Block_Composition_Index), &Layer->Block_Composition_Index);
            Layer->Block_Composition_Index = File->Comp_Count - 1;
        }
    }
    block_layer *PrecompLayer = Layer_Init(File, Memory);
    bezier_point Point0 = { 1, {0, 0, 1, 0, 1, 0}, interpolation_type_linear, 0, {0, 0, 0}, 0 };
    bezier_point Point1 = { 1, {(real32)NewComp->Frame_End, (real32)NewComp->Frame_End, 1, 0, 1, 0}, interpolation_type_linear, 0, {0, 0, 0}, 0 };
    Bezier_Add(Memory, F_Layers, &PrecompLayer->time, Point0, NULL);
    Bezier_Add(Memory, F_Layers, &PrecompLayer->time, Point1, NULL);
    PrecompLayer->IsPrecomp = true;
    Layer_Select(Memory, State, Memory_Block_LazyIndexAtAddress(Memory, F_Layers, PrecompLayer));
    PrecompLayer->Block_Source_Index = File->Comp_Count - 1;
    PrecompLayer->Block_Composition_Index = CompIndex;
    PrecompLayer->Vertical_Offset = TopOffset;
    PrecompLayer->Frame_End = NewComp->Frame_End;
    PrecompLayer->ColIndex = 3;
    PrecompLayer->x.CurrentValue = Comp->Width/2;
    PrecompLayer->y.CurrentValue = Comp->Height/2;
    History_Entry_End(Memory);
    State->UpdateFrame = true;
}


// Helper for working with different bit depths.
static render_byte_info
Bitmap_ByteInfo(uint32 BytesPerPixel) {
    render_byte_info Byte = {};
    if (BytesPerPixel == 4) {
        Byte.MaskPixel = 0xFF;
        Byte.ByteOffset = 1;
        Byte.Normalized = 1 / 255.0f;
        Byte.Bits = 255;
    } else if (BytesPerPixel == 8) {
        Byte.MaskPixel = 0xFFFF;
        Byte.ByteOffset = 2;
        Byte.Normalized = 1 / 65535.0f;
        Byte.Bits = 65535;
    } else {
        Byte.MaskPixel = 0xFFFFFFFF;
        Byte.ByteOffset = 4;
        Byte.Normalized = 1 / 4294967295.0f;
        Byte.Bits = 4294967295;
        Assert(0);
    }
    return Byte;
}

// TODO(fox): Make separate full-size bitmap that gets scaled on the GPU instead of this
static void
State_BindBrushTexture(memory *Memory, brush_state *Brush, uint32 BytesPerPixel)
{
    GL_GenAndBindTexture(&Brush->GLTexture, Brush->Size, Brush->Size, BytesPerPixel, Brush->PaintBuffer);
}

static void
Brush_CalcBitmapAlphaFromSize(memory *Memory, brush_state *Brush, uint32 BytesPerPixel)
{
    int32 BrushLength = Brush->Size;
    if (BrushLength > 128) {
        BrushLength = BrushLength + (16 - (BrushLength % 16));
    }
    real32 BrushCenter = (real32)BrushLength / 2;
    real32 MaxLength = BrushCenter;
    void *BrushAddress = Brush->PaintBuffer;

    render_byte_info Byte = Bitmap_ByteInfo(BytesPerPixel);

    for (int Y = 0; Y < BrushLength; Y++) {
        for (int X = 0; X < BrushLength; X++) {
            uint8 *PixelAddress = (uint8 *)BrushAddress + (Y * BytesPerPixel*BrushLength) + (X * BytesPerPixel);
            uint32 *R_DestAddress = (uint32 *)(PixelAddress + Byte.ByteOffset*0);
            // uint32 *G_DestAddress = (uint32 *)(PixelAddress + Byte.ByteOffset*1);
            // uint32 *B_DestAddress = (uint32 *)(PixelAddress + Byte.ByteOffset*2);
            uint32 *A_DestAddress = (uint32 *)(PixelAddress + Byte.ByteOffset*3);
            v2 Pos = V2(BrushCenter - X, BrushCenter - Y);
            real32 L = sqrt(LengthSq(Pos));
            real32 Gradient = Ceil(L, MaxLength) / MaxLength;
            Gradient = pow(Gradient, Brush->Hardness);
            // Gradient = (Gradient >= 0.04045) ? pow((Gradient + 0.055) / (1 + 0.055), 2.4) : Gradient / 12.92;
            // Gradient = (Gradient >= 0.0031308) ? (1.055) * pow(Gradient, (1.0/2.4)) - 0.055 : 12.92 * Gradient;
            *R_DestAddress = (*R_DestAddress & ~Byte.MaskPixel) | Byte.Bits;  // brush preview is red
            *A_DestAddress = (*A_DestAddress & ~Byte.MaskPixel) | (uint32)((1.0f - Gradient)*Byte.Bits);
        }
    }
}

// Imported bitmaps are stored in linear, and all ops are also done in linear.
static void
Bitmap_SRGBToLinear(void *Buffer, uint16 Width, uint16 Height, uint16 BytesPerPixel, bool32 ToLinear)
{
    uint8 *Row = (uint8 *)Buffer;
    uint64 TotalBytes = Width * Height * BytesPerPixel;

    render_byte_info LayerBits = Bitmap_ByteInfo(BytesPerPixel);

    uint64 bytes = 0;
    while (bytes < TotalBytes) {
        uint8 *LayerPixel = Row + bytes;
        uint32 *R_DestAddress = (uint32 *)(LayerPixel + LayerBits.ByteOffset * 0);
        uint32 *G_DestAddress = (uint32 *)(LayerPixel + LayerBits.ByteOffset * 1);
        uint32 *B_DestAddress = (uint32 *)(LayerPixel + LayerBits.ByteOffset * 2);
        uint32 *A_DestAddress = (uint32 *)(LayerPixel + LayerBits.ByteOffset * 3);

        real32 TexR = (real32)(*R_DestAddress & LayerBits.MaskPixel) * LayerBits.Normalized;
        real32 TexG = (real32)(*G_DestAddress & LayerBits.MaskPixel) * LayerBits.Normalized;
        real32 TexB = (real32)(*B_DestAddress & LayerBits.MaskPixel) * LayerBits.Normalized;
        real32 TexA = (real32)(*A_DestAddress & LayerBits.MaskPixel) * LayerBits.Normalized;

        if (ToLinear) {
            TexR = (TexR >= 0.04045) ? pow((TexR + 0.055) / (1 + 0.055), 2.4) : TexR / 12.92;
            TexG = (TexG >= 0.04045) ? pow((TexG + 0.055) / (1 + 0.055), 2.4) : TexG / 12.92;
            TexB = (TexB >= 0.04045) ? pow((TexB + 0.055) / (1 + 0.055), 2.4) : TexB / 12.92;
            TexA = (TexA >= 0.04045) ? pow((TexA + 0.055) / (1 + 0.055), 2.4) : TexA / 12.92;
        } else {
            TexR = (TexR >= 0.0031308) ? (1.055) * pow(TexR, (1.0/2.4)) - 0.055 : 12.92 * TexR;
            TexG = (TexG >= 0.0031308) ? (1.055) * pow(TexG, (1.0/2.4)) - 0.055 : 12.92 * TexG;
            TexB = (TexB >= 0.0031308) ? (1.055) * pow(TexB, (1.0/2.4)) - 0.055 : 12.92 * TexB;
            TexA = (TexA >= 0.0031308) ? (1.055) * pow(TexA, (1.0/2.4)) - 0.055 : 12.92 * TexA;
        }

        uint32 R_Out = (uint32)(Normalize(TexR) * LayerBits.Bits);
        uint32 G_Out = (uint32)(Normalize(TexG) * LayerBits.Bits);
        uint32 B_Out = (uint32)(Normalize(TexB) * LayerBits.Bits);
        uint32 A_Out = (uint32)(Normalize(TexA) * LayerBits.Bits);

        *R_DestAddress = (*R_DestAddress & ~LayerBits.MaskPixel) | R_Out;
        *G_DestAddress = (*G_DestAddress & ~LayerBits.MaskPixel) | G_Out;
        *B_DestAddress = (*B_DestAddress & ~LayerBits.MaskPixel) | B_Out;
        *A_DestAddress = (*A_DestAddress & ~LayerBits.MaskPixel) | A_Out;
        bytes += BytesPerPixel;
    }
}

static void
Brush_Info(brush_info *B, brush_state *Brush, block_source *Source, void *SourceBuffer, v2 LayerPos, v4 Color)
{
    B->BrushLength = (uint32)Brush->Size;
    if (B->BrushLength > 128) {
        B->BrushLength = B->BrushLength + (16 - (B->BrushLength % 16));
    }

    rectangle RenderRegion = { 0, 0, Source->Width, Source->Height };
    rectangle BrushPos = { (int32)(LayerPos.x - (B->BrushLength / 2)),
                           (int32)(LayerPos.y - (B->BrushLength / 2)),
                           (int32)(LayerPos.x + (B->BrushLength / 2)),
                           (int32)(LayerPos.y + (B->BrushLength / 2)) };

    B->LayerBounds = ClipRectangle(BrushPos, RenderRegion);

    if (BrushPos.Min.x < Brush->CacheBounds.Min.x)
        Brush->CacheBounds.Min.x = BrushPos.Min.x;
    if (BrushPos.Min.y < Brush->CacheBounds.Min.y)
        Brush->CacheBounds.Min.y = BrushPos.Min.y;
    if (BrushPos.Max.x > Brush->CacheBounds.Max.x)
        Brush->CacheBounds.Max.x = BrushPos.Max.x;
    if (BrushPos.Max.y > Brush->CacheBounds.Max.y)
        Brush->CacheBounds.Max.y = BrushPos.Max.y;

    Assert(Source->Type == source_type_principal);

    B->BytesPerPixel = 4;
    B->SourceWidth = Source->Width;
    B->SourceBytesPerPixel = Source->BytesPerPixel;
    B->SourceBuffer = SourceBuffer;

    Assert(Source->BytesPerPixel == 4);

    B->LayerPitch = Source->Width*Source->BytesPerPixel;
    B->BrushPitch = (int)B->BrushLength * B->BytesPerPixel;

    B->LayerBits = Bitmap_ByteInfo(Source->BytesPerPixel);
    B->BrushBits = Bitmap_ByteInfo(B->BytesPerPixel);

    B->ExtraX = 0;
    B->ExtraY = 0;
    if (BrushPos.Min.x < 0) {
        B->ExtraX = BrushPos.Min.x;
    }
    if (BrushPos.Min.y < 0) {
        B->ExtraY = BrushPos.Min.y;
    }

    B->BrushBuffer = Brush->PaintBuffer;
    B->EraseMode = Brush->EraseMode;

    B->R_Brush = (Color.r >= 0.04045) ? pow((Color.r + 0.055) / (1 + 0.055), 2.4) : Color.r / 12.92;
    B->G_Brush = (Color.g >= 0.04045) ? pow((Color.g + 0.055) / (1 + 0.055), 2.4) : Color.g / 12.92;
    B->B_Brush = (Color.b >= 0.04045) ? pow((Color.b + 0.055) / (1 + 0.055), 2.4) : Color.b / 12.92;
    B->A_Brush = (Color.a >= 0.04045) ? pow((Color.a + 0.055) / (1 + 0.055), 2.4) : Color.a / 12.92;

    B->BrushRow = (uint8 *)B->BrushBuffer;
}

void Bitmap_SwapData(uint8 *Address_0, uint8 *Address_1, uint64 Size, uint16 BytesPerPixel)
{
    uint64 i = 0;
    uint16 ByteOffset = Bitmap_ByteInfo(BytesPerPixel).ByteOffset;
    uint64 RemainderBytes = Size % ByteOffset;
    Assert(BytesPerPixel == 4);

    while (i < Size) {
        uint32 *Pixel_0 = (uint32 *)(Address_0 + i);
        uint32 *Pixel_1 = (uint32 *)(Address_1 + i);
        if (*Pixel_0 != 0x00000000) {
            uint32 Temp = *Pixel_1;
            *Pixel_1 = *Pixel_0;
            *Pixel_0 = Temp;
        }
        i += sizeof(uint32);
    }
}


static void
PaintTest(brush_info B, void *CacheBuffer, rectangle RenderRegion)
{
    for (int32 Y = RenderRegion.Min.y; Y < RenderRegion.Max.y; Y++) {
        for (int32 X = RenderRegion.Min.x; X < RenderRegion.Max.x; X++) {

            uint32 Offset = Y*B.LayerPitch + X*B.SourceBytesPerPixel;
            uint8 *LayerPixel = (uint8 *)CacheBuffer + Offset;

            uint32 *R_DestAddress = (uint32 *)(LayerPixel + B.LayerBits.ByteOffset * 0);
            uint32 *G_DestAddress = (uint32 *)(LayerPixel + B.LayerBits.ByteOffset * 1);
            uint32 *B_DestAddress = (uint32 *)(LayerPixel + B.LayerBits.ByteOffset * 2);
            uint32 *A_DestAddress = (uint32 *)(LayerPixel + B.LayerBits.ByteOffset * 3);

            real32 R_Layer = (real32)(*R_DestAddress & B.LayerBits.MaskPixel) * B.LayerBits.Normalized;
            real32 G_Layer = (real32)(*G_DestAddress & B.LayerBits.MaskPixel) * B.LayerBits.Normalized;
            real32 B_Layer = (real32)(*B_DestAddress & B.LayerBits.MaskPixel) * B.LayerBits.Normalized;
            real32 A_Layer = (real32)(*A_DestAddress & B.LayerBits.MaskPixel) * B.LayerBits.Normalized;

            int32 TrueX = (X - B.LayerBounds.Min.x) - B.ExtraX;
            int32 TrueY = (Y - B.LayerBounds.Min.y) - B.ExtraY;

            uint8 *SourcePixel = (uint8 *)B.SourceBuffer + Offset;
            Assert(B.SourceBytesPerPixel == 4);
            bool32 IsEmpty = (*(uint32 *)SourcePixel == 0x00000000);
            if (IsEmpty)
                *(uint32 *)SourcePixel =  0x00010101;

            // Assert(TrueX >= 0 && TrueX < BrushLength);
            // Assert(TrueY >= 0 && TrueY < BrushLength);

            uint8 *BrushPixel = (uint8 *)B.BrushRow + (TrueY * B.BrushPitch) + (TrueX * B.BytesPerPixel);

            real32 Brush_BitmapAlpha = (real32)((*(uint32 *)(BrushPixel + B.BrushBits.ByteOffset*3)) & B.BrushBits.MaskPixel) * B.BrushBits.Normalized;

            if (!Brush_BitmapAlpha)
                continue;

            real32 BrushAlpha = Brush_BitmapAlpha;
            real32 LayerAlpha = A_Layer;

            real32 A_Blend = 0;
            real32 R_Blend = 0;
            real32 G_Blend = 0;
            real32 B_Blend = 0;

            if (!B.EraseMode) {
                if (IsEmpty) {
                    R_Blend = B.R_Brush;
                    G_Blend = B.G_Brush;
                    B_Blend = B.B_Brush;
                    A_Blend = LayerAlpha + BrushAlpha;
                } else {
                    R_Blend = B.R_Brush;
                    G_Blend = B.G_Brush;
                    B_Blend = B.B_Brush;
                    A_Blend = LayerAlpha + ((1.0f - LayerAlpha) * BrushAlpha);
                    real32 Blend = BrushAlpha;
                    // R_Blend = (R_Layer * (1.0f - Blend)) + (B.R_Brush * Blend);
                    // G_Blend = (G_Layer * (1.0f - Blend)) + (B.G_Brush * Blend);
                    // B_Blend = (B_Layer * (1.0f - Blend)) + (B.B_Brush * Blend);
                }
                // A_Blend = BrushAlpha;
            } else {
                A_Blend = A_Layer * (1.0f - BrushAlpha);
                R_Blend = R_Layer;
                G_Blend = G_Layer;
                B_Blend = B_Layer;
            }

            /*
            R_Blend = (R_Brush * (1.0f - LayerAlpha)) + (R_Blend * LayerAlpha);
            G_Blend = (G_Brush * (1.0f - LayerAlpha)) + (G_Blend * LayerAlpha);
            B_Blend = (B_Brush * (1.0f - LayerAlpha)) + (B_Blend * LayerAlpha);
            */

            Assert(R_Blend <= 1.0f);

            uint32 R_Out = (uint32)(Normalize(R_Blend) * B.LayerBits.Bits);
            uint32 G_Out = (uint32)(Normalize(G_Blend) * B.LayerBits.Bits);
            uint32 B_Out = (uint32)(Normalize(B_Blend) * B.LayerBits.Bits);
            uint32 A_Out = (uint32)(Normalize(A_Blend) * B.LayerBits.Bits);

            *R_DestAddress = (*R_DestAddress & ~B.LayerBits.MaskPixel) | R_Out;
            *G_DestAddress = (*G_DestAddress & ~B.LayerBits.MaskPixel) | G_Out;
            *B_DestAddress = (*B_DestAddress & ~B.LayerBits.MaskPixel) | B_Out;
            *A_DestAddress = (*A_DestAddress & ~B.LayerBits.MaskPixel) | A_Out;
        }
    }
}

#if ARM
#else
static void
PaintTest_AVX2(brush_info B, void *Buffer, rectangle RenderRegion)
{
    __m256 One = _mm256_set1_ps(1);
    __m256 Zero = _mm256_set1_ps(0);
    __m256 Eight = _mm256_set1_ps(8);
    __m256i FF = _mm256_set1_epi32(0xFF);
    __m256 R_Brush =_mm256_set1_ps(B.R_Brush);
    __m256 G_Brush =_mm256_set1_ps(B.G_Brush);
    __m256 B_Brush =_mm256_set1_ps(B.B_Brush);
    __m256 A_Brush =_mm256_set1_ps(B.A_Brush);
    __m256 Norm255 = _mm256_set1_ps(1/255.0f);
    __m256 Real255 = _mm256_set1_ps(255.0f);
    __m256 LayerBoundsMaxX = _mm256_set1_ps(B.SourceWidth);

    for (int32 Y = RenderRegion.Min.y; Y < RenderRegion.Max.y; Y++) {
        __m256 PixelX = _mm256_setr_ps((real32)RenderRegion.Min.x,
                                       (real32)RenderRegion.Min.x+1,
                                       (real32)RenderRegion.Min.x+2,
                                       (real32)RenderRegion.Min.x+3,
                                       (real32)RenderRegion.Min.x+4,
                                       (real32)RenderRegion.Min.x+5,
                                       (real32)RenderRegion.Min.x+6,
                                       (real32)RenderRegion.Min.x+7);
        for (int32 X = RenderRegion.Min.x; X < RenderRegion.Max.x; X += 8) {

            __m256i TileBarrier = _mm256_cvtps_epi32(_mm256_cmp_ps(PixelX, LayerBoundsMaxX, 1));

            uint32 Offset = Y*B.LayerPitch + X*B.SourceBytesPerPixel;
            uint8 *LayerPixelAddress = (uint8 *)Buffer + Offset;

            __m256i LayerPixels = _mm256_loadu_si256((const __m256i *)LayerPixelAddress);

            __m256 R_Layer = _mm256_mul_ps(_mm256_cvtepi32_ps(_mm256_and_si256(                  LayerPixels,      FF)), Norm255);
            __m256 G_Layer = _mm256_mul_ps(_mm256_cvtepi32_ps(_mm256_and_si256(_mm256_srli_epi32(LayerPixels, 8),  FF)), Norm255);
            __m256 B_Layer = _mm256_mul_ps(_mm256_cvtepi32_ps(_mm256_and_si256(_mm256_srli_epi32(LayerPixels, 16), FF)), Norm255);
            __m256 A_Layer = _mm256_mul_ps(_mm256_cvtepi32_ps(_mm256_and_si256(_mm256_srli_epi32(LayerPixels, 24), FF)), Norm255);

            int32 TrueX = (X - B.LayerBounds.Min.x) - B.ExtraX;
            int32 TrueY = (Y - B.LayerBounds.Min.y) - B.ExtraY;
            uint8 *BrushPixelAddress = (uint8 *)B.BrushRow + (TrueY * B.BrushPitch) + (TrueX * B.BytesPerPixel);
            __m256i BrushPixels = _mm256_loadu_si256((const __m256i *)BrushPixelAddress);

            __m256 Brush_BitmapAlpha = _mm256_mul_ps(_mm256_cvtepi32_ps(_mm256_and_si256(_mm256_srli_epi32(BrushPixels, 24), FF)), Norm255);

            __m256 A_BrushMultiplied = _mm256_mul_ps(Brush_BitmapAlpha, A_Brush);

            __m256 A_Blend = _mm256_add_ps(A_Layer, A_BrushMultiplied);

            __m256 R_Blend = _mm256_add_ps(_mm256_mul_ps(R_Layer, _mm256_sub_ps(One, A_BrushMultiplied)), _mm256_mul_ps(R_Brush, A_BrushMultiplied));
            __m256 G_Blend = _mm256_add_ps(_mm256_mul_ps(G_Layer, _mm256_sub_ps(One, A_BrushMultiplied)), _mm256_mul_ps(G_Brush, A_BrushMultiplied));
            __m256 B_Blend = _mm256_add_ps(_mm256_mul_ps(B_Layer, _mm256_sub_ps(One, A_BrushMultiplied)), _mm256_mul_ps(B_Brush, A_BrushMultiplied));

            __m256i R_Out = _mm256_cvtps_epi32(_mm256_mul_ps(_mm256_max_ps(_mm256_min_ps(One, R_Blend), Zero), Real255));
            __m256i G_Out = _mm256_cvtps_epi32(_mm256_mul_ps(_mm256_max_ps(_mm256_min_ps(One, G_Blend), Zero), Real255));
            __m256i B_Out = _mm256_cvtps_epi32(_mm256_mul_ps(_mm256_max_ps(_mm256_min_ps(One, B_Blend), Zero), Real255));
            __m256i A_Out = _mm256_cvtps_epi32(_mm256_mul_ps(_mm256_max_ps(_mm256_min_ps(One, A_Blend), Zero), Real255));

            __m256i OutputPixel = _mm256_or_si256(
                                  _mm256_or_si256(R_Out, _mm256_slli_epi32(G_Out, 8)),
                                  _mm256_or_si256(_mm256_slli_epi32(B_Out, 16), _mm256_slli_epi32(A_Out, 24)));

            // _mm256_storeu_si256((__m256i *)LayerPixelAddress, OutputPixel);
            _mm256_maskstore_epi32((int *)LayerPixelAddress, TileBarrier, OutputPixel);
            PixelX = _mm256_add_ps(PixelX, Eight);
        }
    }
}
#endif

static void
RenderQueue_AddBrush(project_state *State, v2 LayerPos)
{
    State->Queue.Item[State->Queue.CurrentIdx].Pos = LayerPos;
    State->Queue.Item[State->Queue.CurrentIdx].Type = 1;
    State->Queue.CurrentIdx++;
    State->Brush.PrevPos = LayerPos;
}

static void
RenderQueue_AddBlit(project_state *State)
{
    State->Queue.Item[State->Queue.CurrentIdx].Type = 2;
    State->Queue.CurrentIdx++;
}