1 files changed, 248 insertions, 0 deletions
diff --git a/Runtime/Graphics/TextureFormat.cpp b/Runtime/Graphics/TextureFormat.cpp
new file mode 100644
index 0000000..27d60fa
--- /dev/null
+++ b/Runtime/Graphics/TextureFormat.cpp
@@ -0,0 +1,248 @@
+#include "UnityPrefix.h"
+#include "TextureFormat.h"
+#include "Runtime/Utilities/LogAssert.h"
+
+// NOTE: match indices in kTexFormat* enum!
+
+const static int kTextureByteTable[kTexFormatTotalCount] =
+{
+	0,
+	1,	// kTexFormatAlpha8
+	2,	// kTexFormatARGB4444
+	3,  // kTexFormatRGB24
+	4,	// kTexFormatRGBA32
+	4,	// kTexFormatARGB32
+	16, // kTexFormatARGBFloat
+	2,  // kTexFormatRGB565
+	3,  // kTexFormatBGR24
+	2,  // kTexFormatAlphaLum16
+	0,  // kTexFormatDXT1 (Depends on width, height, depth)
+	0,  // kTexFormatDXT3 (Depends on width, height, depth)
+	0,  // kTexFormatDXT5 (Depends on width, height, depth)
+	2,	// kTexFormatRGBA4444
+};
+
+UInt32 GetBytesFromTextureFormat (TextureFormat inFormat)
+{
+	AssertMsg (inFormat < kTexFormatDXT1 || inFormat == kTexFormatBGRA32 || inFormat == kTexFormatRGBA4444, "Invalid texture format: %d", (int)inFormat);
+	return (inFormat == kTexFormatBGRA32) ? 4 : kTextureByteTable[inFormat];
+}
+
+UInt32 GetMaxBytesPerPixel (TextureFormat inFormat)
+{
+	Assert (GetBytesFromTextureFormat (inFormat) <= kTextureByteTable[kTexFormatARGBFloat]);
+	return kTextureByteTable[kTexFormatARGBFloat];
+}
+
+int GetRowBytesFromWidthAndFormat (int width, TextureFormat inFormat)
+{
+	AssertMsg (inFormat < kTexFormatDXT1 || inFormat == kTexFormatBGRA32 || inFormat == kTexFormatRGBA4444, "Invalid texture format: %d", (int)inFormat);
+	return GetBytesFromTextureFormat (inFormat) * width;
+}
+
+bool IsValidTextureFormat (TextureFormat format)
+{
+	if ((format >= kTexFormatAlpha8 && format <= kTexFormatRGBA4444) ||
+		IsCompressedPVRTCTextureFormat(format) ||
+		IsCompressedETCTextureFormat(format) ||
+		IsCompressedATCTextureFormat(format) ||
+		IsCompressedFlashATFTextureFormat (format) ||
+		IsCompressedETC2TextureFormat(format) ||
+		IsCompressedASTCTextureFormat(format) ||
+		IsCompressedEACTextureFormat(format) ||
+		format == kTexFormatBGRA32)
+		return true;
+	else
+		return false;
+}
+
+int GetTextureSizeAllowedMultiple( TextureFormat format )
+{
+	if (IsCompressedDXTTextureFormat(format) || IsCompressedATCTextureFormat(format) || IsCompressedETCTextureFormat(format)
+		 || IsCompressedETC2TextureFormat(format) || IsCompressedEACTextureFormat(format))
+		return 4;
+	else
+		return 1;
+}
+
+int GetMinimumTextureMipSizeForFormat( TextureFormat format )
+{
+	if (format == kTexFormatPVRTC_RGBA2 || format == kTexFormatPVRTC_RGB2)
+		return 16;
+	else if (format == kTexFormatPVRTC_RGBA4 || format == kTexFormatPVRTC_RGB4)
+		return 8;
+	else if (IsCompressedETCTextureFormat(format) || IsCompressedETC2TextureFormat(format) || IsCompressedEACTextureFormat(format))
+		return 4;
+	else if (IsCompressedATCTextureFormat(format))
+		return 4;
+	else if (IsCompressedASTCTextureFormat(format))
+		return 1;
+	else if (IsCompressedFlashATFTextureFormat(format))
+		return 1;
+	else if (IsCompressedDXTTextureFormat(format))
+		return 4;
+	else
+		return 1;
+}
+
+bool IsAlphaOnlyTextureFormat( TextureFormat format )
+{
+	return format == kTexFormatAlpha8;
+}
+
+
+TextureFormat ConvertToAlphaTextureFormat (TextureFormat format)
+{
+	if (format == kTexFormatRGB24 || format == kTexFormatBGR24)
+		return kTexFormatARGB32;
+	else if (format == kTexFormatRGB565)
+		return kTexFormatARGB4444;
+	else if (format == kTexFormatDXT1)
+		return kTexFormatDXT5;
+	else if (format == kTexFormatPVRTC_RGB2)
+		return kTexFormatPVRTC_RGBA2;
+	else if (format == kTexFormatPVRTC_RGB4)
+		return kTexFormatPVRTC_RGBA4;
+	else if (format == kTexFormatETC_RGB4)
+		return kTexFormatARGB4444;
+	else if (format == kTexFormatATC_RGB4)
+		return kTexFormatATC_RGBA8;
+	else if (IsCompressedFlashATFTextureFormat(format))
+		return kTexFormatFlashATF_RGBA_JPG;
+	else if (format == kTexFormatETC2_RGB)
+		return kTexFormatETC2_RGBA8;
+	else
+		return format;
+}
+
+bool HasAlphaTextureFormat( TextureFormat format )
+{
+	return format == kTexFormatAlpha8 || format == kTexFormatARGB4444 || format == kTexFormatRGBA4444 || format == kTexFormatRGBA32 || format == kTexFormatARGB32
+	|| format == kTexFormatARGBFloat || format == kTexFormatAlphaLum16 || format == kTexFormatDXT5 || format == kTexFormatDXT3
+	|| format == kTexFormatPVRTC_RGBA2 || format == kTexFormatPVRTC_RGBA4 || format == kTexFormatATC_RGBA8 || format == kTexFormatBGRA32 || format == kTexFormatFlashATF_RGBA_JPG
+	|| format == kTexFormatETC2_RGBA1 || format == kTexFormatETC2_RGBA8 || (format >= kTexFormatASTC_RGBA_4x4 && format <= kTexFormatASTC_RGBA_12x12);
+}
+
+bool IsDepthRTFormat( RenderTextureFormat format )
+{
+	return format == kRTFormatDepth || format == kRTFormatShadowMap;
+}
+
+bool IsHalfRTFormat( RenderTextureFormat format )
+{
+	return format == kRTFormatARGBHalf || format == kRTFormatRGHalf || format == kRTFormatRHalf || IsDepthRTFormat(format);
+}
+
+const char* GetCompressionTypeString (TextureFormat format)
+{
+	// Shortcut here, no sense in typing all block sizes in switchcase below
+	if(IsCompressedASTCTextureFormat(format))
+		return "ASTC";
+
+	switch (format)
+	{
+		case kTexFormatDXT1: return "DXT1";
+		case kTexFormatDXT3: return "DXT3";
+		case kTexFormatDXT5: return "DXT5";
+		case kTexFormatETC_RGB4: return "ETC1";
+		case kTexFormatETC2_RGB:
+		case kTexFormatETC2_RGBA1:
+		case kTexFormatETC2_RGBA8: return "ETC2";
+		case kTexFormatEAC_R:
+		case kTexFormatEAC_R_SIGNED:
+		case kTexFormatEAC_RG:
+		case kTexFormatEAC_RG_SIGNED: return "EAC";
+		case kTexFormatPVRTC_RGB2:
+		case kTexFormatPVRTC_RGBA2:
+		case kTexFormatPVRTC_RGB4:
+		case kTexFormatPVRTC_RGBA4: return "PVRTC";
+		case kTexFormatATC_RGB4:
+		case kTexFormatATC_RGBA8: return "ATC";
+		case kTexFormatFlashATF_RGB_DXT1: return "DXT1";
+		case kTexFormatFlashATF_RGBA_JPG: return "JPG";
+		case kTexFormatFlashATF_RGB_JPG: return "JPG";
+		default:
+			return "Uncompressed";
+	}
+}
+
+const char* GetTextureFormatString (TextureFormat format)
+{
+	switch (format)
+	{
+		case kTexFormatAlpha8: return "Alpha 8";
+		case kTexFormatARGB4444: return "ARGB 16 bit";
+		case kTexFormatRGBA4444: return "RGBA 16 bit";
+		case kTexFormatRGB24: return "RGB 24 bit";
+		case kTexFormatRGBA32: return "RGBA 32 bit";
+		case kTexFormatARGB32: return "ARGB 32 bit";
+		case kTexFormatARGBFloat: return "ARGB float";
+		case kTexFormatRGB565: return "RGB 16 bit";
+		case kTexFormatBGR24: return "BGR 24 bit";
+		case kTexFormatAlphaLum16: return "Alpha 16 bit";
+		case kTexFormatDXT1: return "RGB Compressed DXT1";
+		case kTexFormatDXT3: return "RGBA Compressed DXT3";
+		case kTexFormatDXT5: return "RGBA Compressed DXT5";
+
+		// gles
+		case kTexFormatPVRTC_RGB2: return "RGB Compressed PVRTC 2 bits";
+		case kTexFormatPVRTC_RGBA2: return "RGBA Compressed PVRTC 2 bits";
+		case kTexFormatPVRTC_RGB4: return "RGB Compressed PVRTC 4 bits";
+		case kTexFormatPVRTC_RGBA4: return "RGBA Compressed PVRTC 4 bits";
+		case kTexFormatETC_RGB4: return "RGB Compressed ETC 4 bits";
+		case kTexFormatATC_RGB4: return "RGB Compressed ATC 4 bits";
+		case kTexFormatATC_RGBA8: return "RGBA Compressed ATC 8 bits";
+
+		case kTexFormatETC2_RGB: return "RGB Compressed ETC2 4 bits";
+		case kTexFormatETC2_RGBA1: return "RGB + 1-bit Alpha Compressed ETC2 4 bits";
+		case kTexFormatETC2_RGBA8: return "RGBA Compressed ETC2 8 bits";
+		case kTexFormatEAC_R: return "11-bit R Compressed EAC 4 bit";
+		case kTexFormatEAC_R_SIGNED: return "11-bit signed R Compressed EAC 4 bit";
+		case kTexFormatEAC_RG: return "11-bit RG Compressed EAC 8 bit";
+		case kTexFormatEAC_RG_SIGNED: return "11-bit signed RG Compressed EAC 8 bit";
+
+#define STR_(x) #x
+#define STR(x) STR_(x)
+#define DO_ASTC(bx,by) case kTexFormatASTC_RGB_##bx##x##by : return "RGB Compressed ASTC " STR(bx) "x" STR(by) " block"; case kTexFormatASTC_RGBA_##bx##x##by : return "RGBA Compressed ASTC " STR(bx) "x" STR(by) " block"
+
+		DO_ASTC(4, 4);
+		DO_ASTC(5, 5);
+		DO_ASTC(6, 6);
+		DO_ASTC(8, 8);
+		DO_ASTC(10, 10);
+		DO_ASTC(12, 12);
+
+#undef DO_ASTC
+#undef STR
+#undef STR_
+			
+		// Flash
+		case kTexFormatFlashATF_RGB_DXT1: return "RGB Compressed DXT1";
+		case kTexFormatFlashATF_RGBA_JPG: return "RGBA JPG Compressed";
+		case kTexFormatFlashATF_RGB_JPG: return "RGB JPG Compressed";
+
+		case kTexFormatBGRA32: return "BGRA 32 bit";
+
+		default:
+		return "Unsupported";
+	}
+}
+
+const char* GetTextureColorSpaceString (TextureColorSpace colorSpace)
+{
+	switch (colorSpace)
+	{
+		case kTexColorSpaceLinear: return "Linear";
+		case kTexColorSpaceSRGB: return "sRGB";
+		case kTexColorSpaceSRGBXenon: return "sRGB (Xenon)";
+		default: return "Unsupported";
+	}
+}
+
+TextureColorSpace ColorSpaceToTextureColorSpace(BuildTargetPlatform platform, ColorSpace colorSpace)
+{
+	if (colorSpace == kGammaColorSpace)
+		return (platform == kBuildXBOX360) ? kTexColorSpaceSRGBXenon : kTexColorSpaceSRGB;
+	else
+		return kTexColorSpaceLinear;
+}