FSlateShaderResourceProxy* FSlateD3DTextureManager::CreateDynamicTextureResource(FName ResourceName, uint32 Width, uint32 Height, const TArray< uint8 >& RawData)
{
// Bail out if we already have this texture loaded
TSharedPtr<FDynamicTextureResource> TextureResource = DynamicTextureMap.FindRef(ResourceName);
if (TextureResource.IsValid())
{
return TextureResource->Proxy;
}
// Keep track of non-atlased textures so we can free their resources later
FSlateD3DTexture* LoadedTexture = new FSlateD3DTexture(Width, Height);
TextureResource = MakeShareable(new FDynamicTextureResource(LoadedTexture));
D3D11_SUBRESOURCE_DATA InitData;
InitData.pSysMem = RawData.GetTypedData();
InitData.SysMemPitch = Width * 4;
FNewTextureInfo Info;
Info.bShouldAtlas = false;
LoadedTexture->Init(Info.bSrgb ? DXGI_FORMAT_R8G8B8A8_UNORM_SRGB : DXGI_FORMAT_R8G8B8A8_UNORM, &InitData);
TextureResource->Proxy->ActualSize = FIntPoint(Width, Height);
TextureResource->Proxy->Resource = TextureResource->D3DTexture;
// Map the new resource for the UTexture so we don't have to load again
DynamicTextureMap.Add(ResourceName, TextureResource);
return TextureResource->Proxy;
}
FSlateUpdatableTexture* FSlateD3DRenderer::CreateUpdatableTexture(uint32 Width, uint32 Height)
{
FSlateD3DTexture* NewTexture = new FSlateD3DTexture(Width, Height);
NewTexture->Init(DXGI_FORMAT_B8G8R8A8_UNORM_SRGB, NULL, D3D11_USAGE_DYNAMIC, D3D11_CPU_ACCESS_WRITE);
return NewTexture;
}
FSlateShaderResourceProxy* FSlateD3DTextureManager::GenerateTextureResource( const FNewTextureInfo& Info )
{
FSlateShaderResourceProxy* NewProxy = NULL;
const uint32 Width = Info.TextureData->GetWidth();
const uint32 Height = Info.TextureData->GetHeight();
if( Info.bShouldAtlas )
{
const uint32 AtlasSize = 1024;
// 4 bytes per pixel
const uint32 AtlasStride = sizeof(uint8)*4;
const uint8 Padding = 1;
const FAtlasedTextureSlot* NewSlot = NULL;
FSlateTextureAtlasD3D* Atlas = NULL;
// Get the last atlas and find a slot for the texture
for( int32 AtlasIndex = 0; AtlasIndex < TextureAtlases.Num(); ++AtlasIndex )
{
Atlas = TextureAtlases[AtlasIndex];
NewSlot = Atlas->AddTexture( Width, Height, Info.TextureData->GetRawBytes() );
if( NewSlot )
{
break;
}
}
// No new slot was found in any atlas so we have to make another one
if( !NewSlot )
{
// A new slot in the atlas could not be found, make a new atlas and add the texture to it
Atlas = new FSlateTextureAtlasD3D( AtlasSize, AtlasSize, AtlasStride, Padding );
TextureAtlases.Add( Atlas );
NewSlot = TextureAtlases.Last()->AddTexture( Width, Height, Info.TextureData->GetRawBytes() );
}
check( Atlas && NewSlot );
// Create a proxy representing this texture in the atlas
NewProxy = new FSlateShaderResourceProxy;
NewProxy->Resource = Atlas->GetAtlasTexture();
// Compute the sub-uvs for the location of this texture in the atlas, accounting for padding
NewProxy->StartUV = FVector2D( (float)(NewSlot->X+Padding) / Atlas->GetWidth(), (float)(NewSlot->Y+Padding) / Atlas->GetHeight() );
NewProxy->SizeUV = FVector2D( (float)(NewSlot->Width-Padding*2) / Atlas->GetWidth(), (float)(NewSlot->Height-Padding*2) / Atlas->GetHeight() );
NewProxy->ActualSize = FIntPoint( Width, Height );
}
else
{
// The texture is not atlased create a new texture proxy and just point it to the actual texture
NewProxy = new FSlateShaderResourceProxy;
// Keep track of non-atlased textures so we can free their resources later
FSlateD3DTexture* Texture = new FSlateD3DTexture( Width, Height );
NonAtlasedTextures.Add( Texture );
NewProxy->Resource = Texture;
NewProxy->StartUV = FVector2D(0.0f,0.0f);
NewProxy->SizeUV = FVector2D(1.0f, 1.0f);
NewProxy->ActualSize = FIntPoint( Width, Height );
D3D11_SUBRESOURCE_DATA InitData;
InitData.pSysMem = Info.TextureData->GetRawBytes().GetTypedData();
InitData.SysMemPitch = Width * 4;
Texture->Init( Info.bSrgb ? DXGI_FORMAT_R8G8B8A8_UNORM_SRGB : DXGI_FORMAT_R8G8B8A8_UNORM, &InitData );
}
return NewProxy;
}
