Trade-offs between RGBA and BGRA formats for Metal textures
I am developing an iOS application using Metal and have the choice of using either RGBA or BGRA for texture formats. The application will be:
- Rendering into textures
- Drawing textures on screen
- Generating
UIImagesfrom textures - Initialising textures from
UIImages
Are there any performance trade-offs for choosing RGBA over BGRA? The latter two points lead me to RGBA, but I also notice that MTKTextureLoader defaults to BGRA textures. I was unable to find any application notes addressing difference between RGBA and BRGA in Metal.
ios opengl-es metal
asked Nov 19 '18 at 16:31
HristoHristo
2,33531632
add a comment |
I am developing an iOS application using Metal and have the choice of using either RGBA or BGRA for texture formats. The application will be:
- Rendering into textures
- Drawing textures on screen
- Generating
UIImagesfrom textures - Initialising textures from
UIImages
Are there any performance trade-offs for choosing RGBA over BGRA? The latter two points lead me to RGBA, but I also notice that MTKTextureLoader defaults to BGRA textures. I was unable to find any application notes addressing difference between RGBA and BRGA in Metal.
ios opengl-es metal
asked Nov 19 '18 at 16:31
HristoHristo
2,33531632
I'll note that thepixelFormatofCAMetalLayerandMTKViewdefault to BRGA.
– Ken Thomases
Nov 19 '18 at 16:55
1
I think Ken meant to say that they default toBGRAbecause I don't think there's aBRGApixel format. Under macOS 10.14, if you create a basicMTKViewusinginitWithFrame:device, then the pixel format isMTLPixelFormatBGRA8Unorm.
– kennyc
Nov 20 '18 at 9:44
Yes, thanks and sorry for the confusion. I meant BGRA.
– Ken Thomases
Nov 20 '18 at 16:51
add a comment |
I am developing an iOS application using Metal and have the choice of using either RGBA or BGRA for texture formats. The application will be:
- Rendering into textures
- Drawing textures on screen
- Generating
UIImagesfrom textures - Initialising textures from
UIImages
Are there any performance trade-offs for choosing RGBA over BGRA? The latter two points lead me to RGBA, but I also notice that MTKTextureLoader defaults to BGRA textures. I was unable to find any application notes addressing difference between RGBA and BRGA in Metal.
ios opengl-es metal
asked Nov 19 '18 at 16:31
HristoHristo
2,33531632
I am developing an iOS application using Metal and have the choice of using either RGBA or BGRA for texture formats. The application will be:
- Rendering into textures
- Drawing textures on screen
- Generating
UIImagesfrom textures - Initialising textures from
UIImages
Are there any performance trade-offs for choosing RGBA over BGRA? The latter two points lead me to RGBA, but I also notice that MTKTextureLoader defaults to BGRA textures. I was unable to find any application notes addressing difference between RGBA and BRGA in Metal.
ios opengl-es metal
ios opengl-es metal
asked Nov 19 '18 at 16:31
HristoHristo
2,33531632
asked Nov 19 '18 at 16:31
HristoHristo
2,33531632
edited Nov 20 '18 at 7:42
Hristo
asked Nov 19 '18 at 16:31
HristoHristo
2,33531632
asked Nov 19 '18 at 16:31
HristoHristo
2,33531632
asked Nov 19 '18 at 16:31
HristoHristo
2,33531632
2,33531632
I'll note that thepixelFormatofCAMetalLayerandMTKViewdefault to BRGA.
– Ken Thomases
Nov 19 '18 at 16:55
1
I think Ken meant to say that they default toBGRAbecause I don't think there's aBRGApixel format. Under macOS 10.14, if you create a basicMTKViewusinginitWithFrame:device, then the pixel format isMTLPixelFormatBGRA8Unorm.
– kennyc
Nov 20 '18 at 9:44
Yes, thanks and sorry for the confusion. I meant BGRA.
– Ken Thomases
Nov 20 '18 at 16:51
add a comment |
I'll note that thepixelFormatofCAMetalLayerandMTKViewdefault to BRGA.
– Ken Thomases
Nov 19 '18 at 16:55
1
I think Ken meant to say that they default toBGRAbecause I don't think there's aBRGApixel format. Under macOS 10.14, if you create a basicMTKViewusinginitWithFrame:device, then the pixel format isMTLPixelFormatBGRA8Unorm.
– kennyc
Nov 20 '18 at 9:44
Yes, thanks and sorry for the confusion. I meant BGRA.
– Ken Thomases
Nov 20 '18 at 16:51
I'll note that the
pixelFormat of CAMetalLayer and MTKView default to BRGA.– Ken Thomases
Nov 19 '18 at 16:55
I'll note that the
pixelFormat of CAMetalLayer and MTKView default to BRGA.– Ken Thomases
Nov 19 '18 at 16:55
1
1
I think Ken meant to say that they default to
BGRA because I don't think there's a BRGA pixel format. Under macOS 10.14, if you create a basic MTKView using initWithFrame:device, then the pixel format is MTLPixelFormatBGRA8Unorm.– kennyc
Nov 20 '18 at 9:44
I think Ken meant to say that they default to
BGRA because I don't think there's a BRGA pixel format. Under macOS 10.14, if you create a basic MTKView using initWithFrame:device, then the pixel format is MTLPixelFormatBGRA8Unorm.– kennyc
Nov 20 '18 at 9:44
Yes, thanks and sorry for the confusion. I meant BGRA.
– Ken Thomases
Nov 20 '18 at 16:51
Yes, thanks and sorry for the confusion. I meant BGRA.
– Ken Thomases
Nov 20 '18 at 16:51
add a comment |
1 Answer
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BGRA is the default and most optimal format for textures and image data on iOS devices. While RGBA is supported, use of RGBA format can result in real performance issues when reading RGBA textures with UIImage and CoreGraphics because these layers can silently reorder the bytes for each pixel (this hurts performance for every pixel). BGRA native data can be copied via memcpy() on the device.
answered Nov 19 '18 at 21:48
MoDJMoDJ
3,10711648
add a comment |
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BGRA is the default and most optimal format for textures and image data on iOS devices. While RGBA is supported, use of RGBA format can result in real performance issues when reading RGBA textures with UIImage and CoreGraphics because these layers can silently reorder the bytes for each pixel (this hurts performance for every pixel). BGRA native data can be copied via memcpy() on the device.
answered Nov 19 '18 at 21:48
MoDJMoDJ
3,10711648
add a comment |
BGRA is the default and most optimal format for textures and image data on iOS devices. While RGBA is supported, use of RGBA format can result in real performance issues when reading RGBA textures with UIImage and CoreGraphics because these layers can silently reorder the bytes for each pixel (this hurts performance for every pixel). BGRA native data can be copied via memcpy() on the device.
answered Nov 19 '18 at 21:48
MoDJMoDJ
3,10711648
add a comment |
BGRA is the default and most optimal format for textures and image data on iOS devices. While RGBA is supported, use of RGBA format can result in real performance issues when reading RGBA textures with UIImage and CoreGraphics because these layers can silently reorder the bytes for each pixel (this hurts performance for every pixel). BGRA native data can be copied via memcpy() on the device.
answered Nov 19 '18 at 21:48
MoDJMoDJ
3,10711648
BGRA is the default and most optimal format for textures and image data on iOS devices. While RGBA is supported, use of RGBA format can result in real performance issues when reading RGBA textures with UIImage and CoreGraphics because these layers can silently reorder the bytes for each pixel (this hurts performance for every pixel). BGRA native data can be copied via memcpy() on the device.
answered Nov 19 '18 at 21:48
MoDJMoDJ
3,10711648
answered Nov 19 '18 at 21:48
MoDJMoDJ
3,10711648
answered Nov 19 '18 at 21:48
MoDJMoDJ
3,10711648
answered Nov 19 '18 at 21:48
MoDJMoDJ
3,10711648
3,10711648
add a comment |
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I'll note that the
pixelFormatofCAMetalLayerandMTKViewdefault to BRGA.– Ken Thomases
Nov 19 '18 at 16:55
1
I think Ken meant to say that they default to
BGRAbecause I don't think there's aBRGApixel format. Under macOS 10.14, if you create a basicMTKViewusinginitWithFrame:device, then the pixel format isMTLPixelFormatBGRA8Unorm.– kennyc
Nov 20 '18 at 9:44
Yes, thanks and sorry for the confusion. I meant BGRA.
– Ken Thomases
Nov 20 '18 at 16:51