Difference between revisions of "PixelFormat"

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<nowiki>*</nowiki> -infinity and +infinity are also valid values.<br>
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<nowiki>**</nowiki> +infinity is also a valid value.
  
 
== Depth / stencil formats ==
 
== Depth / stencil formats ==

Revision as of 16:12, 31 October 2018

Available since LÖVE 11.0
This enum replaces CanvasFormat and CompressedImageFormat.

Pixel formats for Textures, ImageData, and CompressedImageData.

Normal color formats

Constants

Name Components Bits per pixel Range Usable with Canvases Usable with ImageData Note(s)
r8 1 8 [0, 1] Yes
rg8 2 16 [0, 1] Yes
rgba8 4 32 [0, 1] Yes Yes
srgba8 4 32 [0, 1] Yes gamma-correct version of rgba8.
rgba16 4 64 [0, 1] Yes
r16f 1 16 [-65504, +65504]* Yes
rg16f 2 32 [-65504, +65504]* Yes
rgba16f 4 64 [-65504, +65504]* Yes Yes
r32f 1 32 [-3.4028235e38, 3.4028235e38]* Yes
rg32f 2 64 [-3.4028235e38, 3.4028235e38]* Yes
rgba32f 4 128 [-3.4028235e38, 3.4028235e38]* Yes Yes
rgba4 4 16 [0, 1] Yes
rgb5a1 4 16 [0, 1] Yes
rgb565 3 16 [0, 1] Yes
rgb10a2 4 32 [0, 1] Yes
rg11b10f 3 32 [0, 65024]** Yes

* -infinity and +infinity are also valid values.
** +infinity is also a valid value.

Depth / stencil formats

All depth and stencil pixel formats are only usable in Canvases.

They are non-readable by default, and Canvases with a depth/stencil format created with the readable flag can only access the depth values of their pixels in shaders (stencil values are not readable no matter what).

Constants

Name Bits per pixel Has depth Has stencil Note(s)
stencil8 8 Yes
depth16 16 Yes
depth24 24 Yes
depth32f 32 Yes
depth24stencil8 32 Yes Yes
depth32fstencil8 40 Yes Yes

Compressed formats

All compressed pixel formats are only usable in Images via CompressedImageData (compressed textures).

Unlike regular color formats, these stay compressed in RAM and VRAM. This is good for saving memory space as well as improving performance, since the graphics card will be able to keep more of the image's pixels in its fast-access cache when drawing it.

Constants (desktop GPUs)

Name Components Bits per pixel Range Note(s)
DXT1 3 4 [0, 1] Suitable for fully opaque images on desktop systems.
DXT3 4 8 [0, 1] Smooth variations in opacity do not mix well with this format. DXT1 or DXT5 is generally better in every situation.
DXT5 4 8 [0, 1] Recommended for images with varying opacity on desktop systems.
BC4 1 4 [0, 1] Also known as 3Dc+ or ATI1. Stores just the red channel.
BC4s 1 4 [-1, 1] Less precision than BC4 but allows negative numbers.
BC5 2 8 [0, 1] Also known as 3Dc or ATI2. Often used for normal maps on desktop systems.
BC5s 2 8 [-1, 1] Less precision than BC5 but allows negative numbers. Often used for normal maps on desktop systems.
BC6h 3 8 [0, +infinity] Stores half-precision floating point RGB data. Suitable for HDR images on desktop systems.
BC6hs 3 8 [-infinity, +infinity] Less precision than BC6h but allows negative numbers.
BC7 4 8 [0, 1] Very good at representing opaque or transparent images, but requires a DX11 / OpenGL 4-capable GPU.

Constants (mobile GPUs)

Name Components Bits per pixel Range Note(s)
ETC1 3 4 [0, 1] Suitable for fully opaque images on older Android devices.
ETC2rgb 3 4 [0, 1] Suitable for fully opaque images on newer mobile devices
ETC2rgba 4 8 [0, 1] Recommended for images with varying opacity on newer mobile devices.
ETC2rgba1 4 4 [0, 1] RGBA variant of the ETC2 format where pixels are either fully transparent or fully opaque.
EACr 1 4 [0, 1] Stores just the red channel.
EACrs 1 4 [-1, 1] Less precision than EACr but allows negative numbers.
EACrg 2 8 [0, 1] Stores red and green channels.
EACrgs 2 8 [-1, 1] Less precision than EACrg but allows negative numbers.
PVR1rgb2 3 2 [0, 1] Images using this format must be square and power-of-two sized.
PVR1rgb4 3 4 [0, 1] Images using this format must be square and power-of-two sized.
PVR1rgba2 4 2 [0, 1] Images using this format must be square and power-of-two sized.
PVR1rgba4 4 4 [0, 1] Images using this format must be square and power-of-two sized.
ASTC4x4 4 8 [0, 1]
ASTC5x4 4 6.4 [0, 1]
ASTC5x5 4 5.12 [0, 1]
ASTC6x5 4 4.27 [0, 1]
ASTC6x6 4 3.56 [0, 1]
ASTC8x5 4 3.2 [0, 1]
ASTC8x6 4 2.67 [0, 1]
ASTC8x8 4 2 [0, 1]
ASTC10x5 4 2.56 [0, 1]
ASTC10x6 4 2.13 [0, 1]
ASTC10x8 4 1.6 [0, 1]
ASTC10x10 4 1.28 [0, 1]
ASTC12x10 4 1.07 [0, 1]
ASTC12x12 4 0.89 [0, 1]

Notes

Not all formats are supported in love.graphics Images and Canvases on all systems, although the DXT compressed image formats have close to 100% support on desktop operating systems.

The BC4 and BC5 formats are supported on systems with DirectX 10 / OpenGL 3-capable desktop hardware and drivers. The BC6H and BC7 formats are only supported on desktop systems with DirectX 11 / OpenGL 4-capable hardware and very recent drivers. macOS does not support BC6H or BC7 at all currently.

ETC1 is supported by Android devices, as well as the iPhone 5s and newer.

The ETC2 and EAC formats are supported by the iPhone 5s and newer, and OpenGL ES 3-capable Android devices.

The PVR1 formats are supported by iOS devices, as well as the small number of Android devices which have PowerVR GPUs.

ASTC is only supported by new mobile devices (e.g. the iPhone 6 and newer), and Skylake (and newer) integrated Intel GPUs. It has a variety of variants to allow for picking the most compressed possible one that doesn't have any noticeable compression artifacts, for a given texture.

Use love.graphics.getCanvasFormats and love.graphics.getImageFormats to check for Canvas and Image support, respectively: 

local supportedformats = love.graphics.getImageFormats()

if not supportedformats["DXT5"] then
    -- Can't load CompressedImageData with the DXT5 format into images!
    -- On some Linux systems with Mesa drivers, the user will need to install a "libtxc-dxtn" package because the DXT (aka S3TC) formats used to be patented.
    -- Support for DXT formats on all other desktop drivers is pretty much guaranteed.
end

if not supportedformats["BC5"] then
    -- Can't load CompressedImageData with the BC5 format into images!
    -- The user likely doesn't have a video card capable of using that format.
end

See Also

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