virtual void GetTextureFormats(const UTexture* Texture, TArray<FName>& OutFormats) const
{
check(Texture);
// we remap some of the defaults (with PVRTC and ASTC formats)
static FName FormatRemap[][2] =
{
// Default format: ASTC format:
{ { FName(TEXT("DXT1")) }, { FName(TEXT("ASTC_RGB")) } },
{ { FName(TEXT("DXT5")) }, { FName(TEXT("ASTC_RGBA")) } },
{ { FName(TEXT("DXT5n")) }, { FName(TEXT("ASTC_NormalAG")) } },
{ { FName(TEXT("BC5")) }, { FName(TEXT("ASTC_NormalRG")) } },
{ { FName(TEXT("BC6H")) }, { FName(TEXT("ASTC_RGB")) } },
{ { FName(TEXT("BC7")) }, { FName(TEXT("ASTC_RGBAuto")) } },
{ { FName(TEXT("AutoDXT")) }, { FName(TEXT("ASTC_RGBAuto")) } },
};
FName TextureFormatName = NAME_None;
// forward rendering only needs one channel for shadow maps
if (Texture->LODGroup == TEXTUREGROUP_Shadowmap)
{
TextureFormatName = FName(TEXT("G8"));
}
// if we didn't assign anything specially, then use the defaults
if (TextureFormatName == NAME_None)
{
TextureFormatName = GetDefaultTextureFormatName(Texture, EngineSettings, false);
}
// perform any remapping away from defaults
bool bFoundRemap = false;
for (int32 RemapIndex = 0; RemapIndex < ARRAY_COUNT(FormatRemap); ++RemapIndex)
{
if (TextureFormatName == FormatRemap[RemapIndex][0])
{
// we found a remapping
bFoundRemap = true;
OutFormats.AddUnique(FormatRemap[RemapIndex][1]);
}
}
// if we didn't already remap above, add it now
if (!bFoundRemap)
{
OutFormats.Add(TextureFormatName);
}
}
void FIOSTargetPlatform::GetTextureFormats( const UTexture* Texture, TArray<FName>& OutFormats ) const
{
check(Texture);
// we remap some of the defaults (with PVRTC and ASTC formats)
static FName FormatRemap[] =
{
// original PVRTC ASTC
FName(TEXT("DXT1")), FName(TEXT("PVRTC2")), FName(TEXT("ASTC_RGB")),
FName(TEXT("DXT5")), FName(TEXT("PVRTC4")), FName(TEXT("ASTC_RGBA")),
FName(TEXT("DXT5n")), FName(TEXT("PVRTCN")), FName(TEXT("ASTC_NormalAG")),
FName(TEXT("BC5")), FName(TEXT("PVRTCN")), FName(TEXT("ASTC_NormalRG")),
FName(TEXT("AutoDXT")), FName(TEXT("AutoPVRTC")), FName(TEXT("ASTC_RGBAuto")),
};
static FName NameBGRA8(TEXT("BGRA8"));
static FName NamePOTERROR(TEXT("POTERROR"));
FName TextureFormatName = NAME_None;
// forward rendering only needs one channel for shadow maps
if (Texture->LODGroup == TEXTUREGROUP_Shadowmap && !SupportsMetalMRT())
{
TextureFormatName = FName(TEXT("G8"));
}
// if we didn't assign anything specially, then use the defaults
if (TextureFormatName == NAME_None)
{
TextureFormatName = GetDefaultTextureFormatName(Texture, EngineSettings, false);
}
// perform any remapping away from defaults
bool bFoundRemap = false;
bool bIncludePVRTC = CookPVRTC();
bool bIncludeASTC = CookASTC();
for (int32 RemapIndex = 0; RemapIndex < ARRAY_COUNT(FormatRemap); RemapIndex += 3)
{
if (TextureFormatName == FormatRemap[RemapIndex])
{
// we found a remapping
bFoundRemap = true;
// include the formats we want (use ASTC first so that it is preferred at runtime if they both exist and it's supported)
if (bIncludeASTC)
{
OutFormats.AddUnique(FormatRemap[RemapIndex + 2]);
}
if (bIncludePVRTC)
{
// handle non-power of 2 textures
if (!Texture->Source.IsPowerOfTwo())
{
// option 1: Uncompress, but users will get very large textures unknowningly
// OutFormats.AddUnique(NameBGRA8);
// option 2: Use an "error message" texture so they see it in game
OutFormats.AddUnique(NamePOTERROR);
}
else
{
OutFormats.AddUnique(FormatRemap[RemapIndex + 1]);
}
}
}
}
// if we didn't already remap above, add it now
if (!bFoundRemap)
{
OutFormats.Add(TextureFormatName);
}
}