UnrealEngineUWP/Engine/Source/Developer/HTML5/HTML5TargetPlatform/Private/HTML5TargetPlatform.cpp

// Copyright 1998-2014 Epic Games, Inc. All Rights Reserved.

/*=============================================================================
	HTML5TargetPlatform.cpp: Implements the FHTML5TargetPlatform class.
=============================================================================*/

#include "HTML5TargetPlatformPrivatePCH.h"

#if WITH_EDITOR
#include "TextureLODSettings.h"
#endif 

 /* FHTML5TargetPlatform structors
 *****************************************************************************/

FHTML5TargetPlatform::FHTML5TargetPlatform( )
{
	LocalDevice = MakeShareable(new FHTML5TargetDevice(*this, FPlatformProcess::ComputerName()));

	// load the final HTML5 engine settings for this game
	FConfigCacheIni::LoadLocalIniFile(HTML5EngineSettings, TEXT("Engine"), true, *PlatformName());

#if WITH_ENGINE
	// load up texture settings from the config file
	HTML5LODSettings.Initialize(HTML5EngineSettings, TEXT("SystemSettings"));
	StaticMeshLODSettings.Initialize(HTML5EngineSettings);
#endif
}


 /* ITargetPlatform interface
 *****************************************************************************/

void FHTML5TargetPlatform::GetAllDevices( TArray<ITargetDevicePtr>& OutDevices ) const
{
	OutDevices.Reset();
	OutDevices.Add(LocalDevice);
}


ECompressionFlags FHTML5TargetPlatform::GetBaseCompressionMethod( ) const
{
	return COMPRESS_ZLIB;
}


ITargetDevicePtr FHTML5TargetPlatform::GetDefaultDevice( ) const
{
	return LocalDevice;
}


ITargetDevicePtr FHTML5TargetPlatform::GetDevice( const FTargetDeviceId& DeviceId )
{
	if (LocalDevice.IsValid() && (DeviceId == LocalDevice->GetId()))
	{
		return LocalDevice;
	}

	return NULL;
}

bool FHTML5TargetPlatform::IsSdkInstalled(bool bProjectHasCode, FString& OutDocumentationPath) const
{
	bool bHTML5SDKInstalled = false; // @todo How do we check that the iOS SDK is installed when building from Windows? Is that even possible?
	TCHAR BaseSDKPath[256];
	FPlatformMisc::GetEnvironmentVariable(TEXT("EMSCRIPTEN"), BaseSDKPath, ARRAY_COUNT(BaseSDKPath));
	bHTML5SDKInstalled = FString(BaseSDKPath).Len() > 0;
	return bHTML5SDKInstalled;
}


bool FHTML5TargetPlatform::IsRunningPlatform( ) const
{
	return false; // but this will never be called because this platform doesn't run the target platform framework
}


#if WITH_ENGINE

static FName NAME_OPENGL_ES2_WEBGL(TEXT("GLSL_ES2_WEBGL"));

void FHTML5TargetPlatform::GetAllPossibleShaderFormats( TArray<FName>& OutFormats ) const
{
	OutFormats.AddUnique(NAME_OPENGL_ES2_WEBGL);
}


void FHTML5TargetPlatform::GetAllTargetedShaderFormats( TArray<FName>& OutFormats ) const
{
	GetAllPossibleShaderFormats(OutFormats);
}


const class FStaticMeshLODSettings& FHTML5TargetPlatform::GetStaticMeshLODSettings( ) const
{
	return StaticMeshLODSettings;
}


void FHTML5TargetPlatform::GetTextureFormats( const UTexture* Texture, TArray<FName>& OutFormats ) const
{
	FName TextureFormatName = NAME_None;

#if WITH_EDITOR
	// Supported texture format names.
	static FName NameDXT1(TEXT("DXT1"));
	static FName NameDXT3(TEXT("DXT3"));
	static FName NameDXT5(TEXT("DXT5"));
	static FName NameDXT5n(TEXT("DXT5n"));
	static FName NameAutoDXT(TEXT("AutoDXT"));
	static FName NameBGRA8(TEXT("BGRA8"));
	static FName NameG8(TEXT("G8"));
	static FName NameRGBA16F(TEXT("RGBA16F"));
	static FName NameRGBA8(TEXT("RGBA8"));

	bool bNoCompression = Texture->CompressionNone				// Code wants the texture uncompressed.
		|| (HasEditorOnlyData() && Texture->DeferCompression)	// The user wishes to defer compression, this is ok for the Editor only.
		|| (Texture->CompressionSettings == TC_EditorIcon)
		|| (Texture->LODGroup == TEXTUREGROUP_ColorLookupTable)	// Textures in certain LOD groups should remain uncompressed.
		|| (Texture->LODGroup == TEXTUREGROUP_Bokeh)
		|| (Texture->LODGroup == TEXTUREGROUP_IESLightProfile)
		|| (Texture->Source.GetSizeX() < 4) // Don't compress textures smaller than the DXT block size.
		|| (Texture->Source.GetSizeY() < 4)
		|| (Texture->Source.GetSizeX() % 4 != 0)
		|| (Texture->Source.GetSizeY() % 4 != 0);


	ETextureSourceFormat SourceFormat = Texture->Source.GetFormat();

	// Determine the pixel format of the (un/)compressed texture
	if (bNoCompression)
	{
			if (Texture->HasHDRSource())
			{
				TextureFormatName = NameBGRA8;
			}
			else if (SourceFormat == TSF_G8 || Texture->CompressionSettings == TC_Grayscale)
			{
				TextureFormatName = NameG8;
			}
			else if (Texture->LODGroup == TEXTUREGROUP_Shadowmap)
			{
				TextureFormatName = NameG8;
			}
			else
			{
				TextureFormatName = NameBGRA8;
			}
	}
	else if (Texture->CompressionSettings == TC_HDR)
	{
		TextureFormatName = NameRGBA16F;
	}
	else if (Texture->CompressionSettings == TC_Normalmap)
	{
		TextureFormatName =  NameDXT5;
	}
	else if (Texture->CompressionSettings == TC_Displacementmap)
	{
		TextureFormatName = NameG8;
	}
	else if (Texture->CompressionSettings == TC_VectorDisplacementmap)
	{
		TextureFormatName = NameRGBA8;
	}
	else if (Texture->CompressionSettings == TC_Grayscale)
	{
		TextureFormatName = NameG8;
	}
	else if( Texture->CompressionSettings == TC_Alpha)
	{
		TextureFormatName = NameDXT5;
	}
	else if (Texture->CompressionSettings == TC_DistanceFieldFont)
	{
		TextureFormatName = NameG8;
	}
	else if (Texture->CompressionNoAlpha)
	{
		TextureFormatName = NameDXT1;
	}
	else if (Texture->bDitherMipMapAlpha)
	{
		TextureFormatName = NameDXT5;
	}
	else
	{
		TextureFormatName = NameAutoDXT;
	}

	// Some PC GPUs don't support sRGB read from G8 textures (e.g. AMD DX10 cards on ShaderModel3.0)
	// This solution requires 4x more memory but a lot of PC HW emulate the format anyway
	if ((TextureFormatName == NameG8) && Texture->SRGB && !SupportsFeature(ETargetPlatformFeatures::GrayscaleSRGB))
	{
		TextureFormatName = NameBGRA8;
	}
#endif 

	OutFormats.Add( TextureFormatName); 
}


const struct FTextureLODSettings& FHTML5TargetPlatform::GetTextureLODSettings( ) const
{
	return HTML5LODSettings;
}


FName FHTML5TargetPlatform::GetWaveFormat( USoundWave* Wave ) const
{
	static FName NAME_OGG(TEXT("OGG"));
	return NAME_OGG;
}

#endif // WITH_ENGINE