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Confused about the generation of mipmap in metal?

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2

I set mipmapped to YES in texture2DDescriptorWithPixelFormat and call generateMipmapsForTexture method of MTLBlitCommandEncoder on given texture to automatically generate mipmaps.

The question is if I have set the mipmapped to YES, doesn't it means that the resulting image should be mipmapped, why should I need MTLBlitCommandEncoder to explicit generate mipmaps?

metal

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asked Mar 27 at 8:31

coulsonwangcoulsonwang

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2

I set mipmapped to YES in texture2DDescriptorWithPixelFormat and call generateMipmapsForTexture method of MTLBlitCommandEncoder on given texture to automatically generate mipmaps.

The question is if I have set the mipmapped to YES, doesn't it means that the resulting image should be mipmapped, why should I need MTLBlitCommandEncoder to explicit generate mipmaps?

metal

share|improve this question

asked Mar 27 at 8:31

coulsonwangcoulsonwang

3666 bronze badges

add a comment | 

I set mipmapped to YES in texture2DDescriptorWithPixelFormat and call generateMipmapsForTexture method of MTLBlitCommandEncoder on given texture to automatically generate mipmaps.

The question is if I have set the mipmapped to YES, doesn't it means that the resulting image should be mipmapped, why should I need MTLBlitCommandEncoder to explicit generate mipmaps?

metal

share|improve this question

asked Mar 27 at 8:31

coulsonwangcoulsonwang

3666 bronze badges

share|improve this question

asked Mar 27 at 8:31

coulsonwangcoulsonwang

3666 bronze badges

share|improve this question

asked Mar 27 at 8:31

coulsonwangcoulsonwang

3666 bronze badges

asked Mar 27 at 8:31

coulsonwangcoulsonwang

3666 bronze badges

asked Mar 27 at 8:31

coulsonwangcoulsonwang

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1 Answer
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1

It's a bit confusing, so let's walk through it.

texture2DDescriptorWithPixelFormat takes format, width, height and mipmapped as parameters. The mipmapped parameter is there to tell Metal to calculate the number of mip levels that resulting image will have, since there is no parameter to pass mip level count. Here's how it's described in documentation:

mipmapped

A Boolean indicating whether the resulting image should be
mipmapped. If YES, then the mipmapLevelCount property in the returned
descriptor is computed from width and height. If NO, then
mipmapLevelCount is 1.

If you would use newTextureWithDescriptor with texture descriptor you created explicitly, then there's no mipmapped parameter, since you explicitly pass number of mip levels in mipmapLevelCount property of MTLTextureDescriptor.

Since you create a new texture, there's no reason to generate mipmaps, since the texture is empty.

The generateMipmapsForTexture method is used to generate mipmaps for a texture that already has mip levels and you just need to populate them with mipmaps generated automatically.

So, to get this straight, mipmapped parameter just tells Metal to create a texture that has mip levels, that you can later populate (if you want) with generateMipmapsForTexture (or in some other ways, such as using texture as color attachment in render pass with level specified).

share|improve this answer

edited Mar 27 at 9:08

answered Mar 27 at 8:41

Egor ShkorovEgor Shkorov

1,67811 gold badge1616 silver badges2222 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What if set mipmapped to NO when creating texture, however in the later process found out that I need to generate mipmaps for that texture, what should I do then？
  
  – coulsonwang
  Mar 27 at 9:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Create a new texture with mipmapped set to YES, copy the first mip layer of original texture to the new texture's first layer generate mipmap using blit encoder.
  
  – Egor Shkorov
  Mar 27 at 9:06
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But, I think, since mipmapped texture should only take ~1.5 the space the texture withtout mipmaps takes, you should probably just create the textures that are likely to need mipmaps with mipmapped set to YES, if you aren't memory constrained.
  
  – Egor Shkorov
  Mar 27 at 9:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you are still confused, I can edit the answer, just try to describe the confusing part.
  
  – Egor Shkorov
  Mar 27 at 9:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Always set mipmapped to `YES' seems a good way to avoid additional blit operation when need to generate mipmaps, does it will cause a performance issue?
  
  – coulsonwang
  Mar 27 at 9:13
  

  
  
  
  

 | 
show 3 more comments

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1

It's a bit confusing, so let's walk through it.

texture2DDescriptorWithPixelFormat takes format, width, height and mipmapped as parameters. The mipmapped parameter is there to tell Metal to calculate the number of mip levels that resulting image will have, since there is no parameter to pass mip level count. Here's how it's described in documentation:

mipmapped

A Boolean indicating whether the resulting image should be
mipmapped. If YES, then the mipmapLevelCount property in the returned
descriptor is computed from width and height. If NO, then
mipmapLevelCount is 1.

If you would use newTextureWithDescriptor with texture descriptor you created explicitly, then there's no mipmapped parameter, since you explicitly pass number of mip levels in mipmapLevelCount property of MTLTextureDescriptor.

Since you create a new texture, there's no reason to generate mipmaps, since the texture is empty.

The generateMipmapsForTexture method is used to generate mipmaps for a texture that already has mip levels and you just need to populate them with mipmaps generated automatically.

So, to get this straight, mipmapped parameter just tells Metal to create a texture that has mip levels, that you can later populate (if you want) with generateMipmapsForTexture (or in some other ways, such as using texture as color attachment in render pass with level specified).

share|improve this answer

edited Mar 27 at 9:08

answered Mar 27 at 8:41

Egor ShkorovEgor Shkorov

1,67811 gold badge1616 silver badges2222 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What if set mipmapped to NO when creating texture, however in the later process found out that I need to generate mipmaps for that texture, what should I do then？
  
  – coulsonwang
  Mar 27 at 9:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Create a new texture with mipmapped set to YES, copy the first mip layer of original texture to the new texture's first layer generate mipmap using blit encoder.
  
  – Egor Shkorov
  Mar 27 at 9:06
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But, I think, since mipmapped texture should only take ~1.5 the space the texture withtout mipmaps takes, you should probably just create the textures that are likely to need mipmaps with mipmapped set to YES, if you aren't memory constrained.
  
  – Egor Shkorov
  Mar 27 at 9:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you are still confused, I can edit the answer, just try to describe the confusing part.
  
  – Egor Shkorov
  Mar 27 at 9:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Always set mipmapped to `YES' seems a good way to avoid additional blit operation when need to generate mipmaps, does it will cause a performance issue?
  
  – coulsonwang
  Mar 27 at 9:13
  

  
  
  
  

 | 
show 3 more comments

1

It's a bit confusing, so let's walk through it.

texture2DDescriptorWithPixelFormat takes format, width, height and mipmapped as parameters. The mipmapped parameter is there to tell Metal to calculate the number of mip levels that resulting image will have, since there is no parameter to pass mip level count. Here's how it's described in documentation:

mipmapped

A Boolean indicating whether the resulting image should be
mipmapped. If YES, then the mipmapLevelCount property in the returned
descriptor is computed from width and height. If NO, then
mipmapLevelCount is 1.

If you would use newTextureWithDescriptor with texture descriptor you created explicitly, then there's no mipmapped parameter, since you explicitly pass number of mip levels in mipmapLevelCount property of MTLTextureDescriptor.

Since you create a new texture, there's no reason to generate mipmaps, since the texture is empty.

The generateMipmapsForTexture method is used to generate mipmaps for a texture that already has mip levels and you just need to populate them with mipmaps generated automatically.

So, to get this straight, mipmapped parameter just tells Metal to create a texture that has mip levels, that you can later populate (if you want) with generateMipmapsForTexture (or in some other ways, such as using texture as color attachment in render pass with level specified).

share|improve this answer

edited Mar 27 at 9:08

answered Mar 27 at 8:41

Egor ShkorovEgor Shkorov

1,67811 gold badge1616 silver badges2222 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What if set mipmapped to NO when creating texture, however in the later process found out that I need to generate mipmaps for that texture, what should I do then？
  
  – coulsonwang
  Mar 27 at 9:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Create a new texture with mipmapped set to YES, copy the first mip layer of original texture to the new texture's first layer generate mipmap using blit encoder.
  
  – Egor Shkorov
  Mar 27 at 9:06
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But, I think, since mipmapped texture should only take ~1.5 the space the texture withtout mipmaps takes, you should probably just create the textures that are likely to need mipmaps with mipmapped set to YES, if you aren't memory constrained.
  
  – Egor Shkorov
  Mar 27 at 9:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you are still confused, I can edit the answer, just try to describe the confusing part.
  
  – Egor Shkorov
  Mar 27 at 9:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Always set mipmapped to `YES' seems a good way to avoid additional blit operation when need to generate mipmaps, does it will cause a performance issue?
  
  – coulsonwang
  Mar 27 at 9:13
  

  
  
  
  

 | 
show 3 more comments

It's a bit confusing, so let's walk through it.

texture2DDescriptorWithPixelFormat takes format, width, height and mipmapped as parameters. The mipmapped parameter is there to tell Metal to calculate the number of mip levels that resulting image will have, since there is no parameter to pass mip level count. Here's how it's described in documentation:

mipmapped

A Boolean indicating whether the resulting image should be
mipmapped. If YES, then the mipmapLevelCount property in the returned
descriptor is computed from width and height. If NO, then
mipmapLevelCount is 1.

If you would use newTextureWithDescriptor with texture descriptor you created explicitly, then there's no mipmapped parameter, since you explicitly pass number of mip levels in mipmapLevelCount property of MTLTextureDescriptor.

Since you create a new texture, there's no reason to generate mipmaps, since the texture is empty.

The generateMipmapsForTexture method is used to generate mipmaps for a texture that already has mip levels and you just need to populate them with mipmaps generated automatically.

So, to get this straight, mipmapped parameter just tells Metal to create a texture that has mip levels, that you can later populate (if you want) with generateMipmapsForTexture (or in some other ways, such as using texture as color attachment in render pass with level specified).

share|improve this answer

edited Mar 27 at 9:08

answered Mar 27 at 8:41

Egor ShkorovEgor Shkorov

1,67811 gold badge1616 silver badges2222 bronze badges

share|improve this answer

edited Mar 27 at 9:08

answered Mar 27 at 8:41

Egor ShkorovEgor Shkorov

1,67811 gold badge1616 silver badges2222 bronze badges

answered Mar 27 at 8:41

Egor ShkorovEgor Shkorov

1,67811 gold badge1616 silver badges2222 bronze badges

answered Mar 27 at 8:41

Egor ShkorovEgor Shkorov

1,67811 gold badge1616 silver badges2222 bronze badges