Texture

Texture

GPU Compressed Texture Formats

DirectX と OpenGL の対応、FourCC

Format	DirectX/FourCC	bpp	RGB	alpha	base	block	DXGI (Windows)	OpenGL
S3TC/DXT1/BC1/S3TC-RGB	'DXT1'	4bpp	RGB	-	565	4×4	DXGI_FORMAT_BC1_UNORM	GL_COMPRESSED_RGB_S3TC_DXT1_EXT
S3TC/DXT1/BC1/S3TC-RGBA	'DXT1'	4bpp	RGB	1bit	565	4×4	DXGI_FORMAT_BC1_UNORM	GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
S3TC/DXT3/BC2	'DXT3'	8bpp	RGB	A	565 +4	4×4	DXGI_FORMAT_BC2_UNORM	GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
S3TC/DXT5/BC3	'DXT5'	8bpp	RGB	A	565 +8	4×4	DXGI_FORMAT_BC3_UNORM	GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
S3TC/BC1-SRGB	72	4bpp	RGB	-	565	4×4	DXGI_FORMAT_BC1_UNORM_SRGB	GL_COMPRESSED_SRGB_S3TC_DXT1_EXT
S3TC/BC1-SRGB	72	4bpp	RGB	1bit	565	4×4	DXGI_FORMAT_BC1_UNORM_SRGB	GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
S3TC/BC2-SRGB	75	8bpp	RGB	A	565 +4	4×4	DXGI_FORMAT_BC2_UNORM_SRGB	GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
S3TC/BC3-SRGB	78	8bpp	RGB	A	565 +8	4×4	DXGI_FORMAT_BC3_UNORM_SRGB	GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
ATITC-RGB	'ATC '	4bpp	RGB	-				GL_ATC_RGB_AMD
ATTIC-EA	'ATCA'	8bpp	RGB	A				GL_ATC_RGBA_EXPLICIT_ALPHA_AMD
ATTIC-IA	'ATCI'	8bpp	RGB	A				GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD
ETC1	'ETC '	4bpp	RGB	-	555+333/444	4x2x2		GL_ETC1_RGB8_OES
RGTC/3DC-X/BC4 U	'ATI1'/'BC4U'/80	4bpp	R	-	8	4×4	DXGI_FORMAT_BC4_UNORM	GL_3DC_X_AMD / GL_COMPRESSED_RED_RGTC1_EXT
RGTC/3DC-XY/BC5 U	'ATI2'/'BC5U'/83	8bpp	RG	-	88	4×4	DXGI_FORMAT_BC5_UNORM	GL_3DC_XY_AMD / GL_COMPRESSED_RED_GREEN_RGTC2_EXT
RGTC/3DC-X/BC4 S	'BC4S'/81	4bpp	R	-	8	4×4	DXGI_FORMAT_BC4_SNORM	GL_COMPRESSED_SIGNED_RED_RGTC1_EXT
RGTC/3DC-XY/BC5 S	'BC5S'/84	8bpp	RG	-	88	4×4	DXGI_FORMAT_BC5_SNORM	GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT
LATC UNSIGNED		4bpp	R	-	8	4×4		GL_COMPRESSED_LUMINANCE_LATC1_EXT
LATC UNSIGNED		8bpp	R	A	88	4×4		GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT
LATC SIGNED		4bpp	R	-	8	4×4		GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT
LATC SIGNED		8bpp	R	A	88	4×4		GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT
PVRTC RGBA 4bpp		4bpp	RGB	A	4443	4×4		GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG
PVRTC RGB 4bpp		4bpp	RGB	-	555	4×4		GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG
PVRTC RGBA 2bpp		2bpp	RGB	A	4443	4×8		GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG
PVRTC RGB 2bpp		2bpp	RGB	-	555	4×8		GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG
BPTC/BC6H-UF16	95	8bpp	RGB	-		4×4	DXGI_FORMAT_BC6H_UF16	GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB
BPTC/BC6H-SF16	96	8bpp	RGB	-		4×4	DXGI_FORMAT_BC6H_SF16	GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB
BPTC/BC7	98	8bpp	RGB	A		4×4	DXGI_FORMAT_BC7_UNORM	GL_COMPRESSED_RGBA_BPTC_UNORM_ARB
BPTC/BC7-SRGB	99	8bpp	SRGB	A		4×4	DXGI_FORMAT_BC7_UNORM_SRGB	GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB

GPU Native Formats

OpenGL ES 2.0 GPU では今のところ完全に共通で使える圧縮テクスチャフォーマットがありません。各メーカーバラバラの対応となっています。

GPU	OS	API	DXT,S3TC		RGTC	LATC	BPTC	PVRTC	ATITC	ETC1
GPU	OS	API	DXT1,BC1	DXT3/5,BC2/3	3DC,BC4/5	LATC	BC6H/7	PVRTC	ATITC	ETC1
PowerVR SGX535 iOS	iOS 4.2	OpenGL ES 2.0	×	×	×	×	×	◎	×	×
PowerVR SGX540 Android	Android 2.2	OpenGL ES 2.0	×	×	×	×	×	◎	×	◎
Adreno 200 / AMD Z430	Android 2.2	OpenGL ES 2.0	×	×	◎	×	×	×	◎	◎
Adreno 220	Android 2.3	OpenGL ES 2.0	×	×	◎	×	×	×	◎	◎
ULP GeForce (Tegra 250)	Android 2.2	OpenGL ES 2.0	◎	◎	×	◎	×	×	×	◎
ZMS-08 HD	Android 2.1	OpenGL ES 2.0	◎	◎	×	×	×	×	×	◎
Mali-400MP	Android 2.3	OpenGL ES 2.0	×	×	×	×	×	×	×	◎
FIMG-3DSE			◎	?	×	×	×	×	×	?
GeForce GT 240	Windows 7	OpenGL	◎	◎	◎	◎	×	×	×	×
RADEON HD 5850	Windows 7	OpenGL 4.1	◎	◎	◎	◎	◎	×	×	×
GeForce GT 330M	Windows 7	OpenGL 3.1	◎	◎	◎	◎	×	×	×	×
GeForce GTX 460	Windows 7	OpenGL 4.1	◎	◎	◎	◎	◎	×	×	×
GMA HD	Windows 7	OpenGL 2.1	◎	◎	×	×	×	×	×	×

Android 向け GPU では ETC1 が唯一の共通フォーマットとなります。
Android OS 2.2 (Froyo) では Java に ETC1 の API も追加されています。

GPU 毎の用途別圧縮フォーマット

GPU	RGB	RGB+ A1bit	RGB+A(E)	RGB+A(I)	Normal	Alpha
PVR SGX	PVRTC 2/4bpp		PVRTC 2/4bpp
Adreno	ATC RGB / ETC1		ATC-A	ATC-I	3DC-XY	3DC-X
Tegra	DXT1	DXT1	DXT3	DXT5

Format 資料

BC1/BC2/BC3/BC4/BC5/DXT1/DXT3/DXT5
- Block Compression (Direct3D 10)