OpenGL & Vulkan

[squishynewt]

This used to work on 22.5 drivers but is broken on 22.7? Radeon RX 6700 XT. Code works fine on Nvidia based system.

Call glGenerateMipmap on a compressed texture (lod=0) causes all lod(0-4) to be converted to uncompressed format.

Documentation states: "The internal formats of the derived mipmap images all match those of the levelbase image."

Spoiler

Dim texID As Integer = GL.GenTexture()
GL.BindTexture(TextureTarget.Texture2D, texID)

GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureBaseLevel, 0)
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMaxLevel, 4)

Dim ft As Integer
GL.GetTexLevelParameter(TextureTarget.Texture2D, 0, GetTextureParameter.TextureInternalFormat, ft)
Debug.WriteLine(ft) ' OUTPUTS 33777 = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT

GL.GenerateMipmap(GenerateMipmapTarget.Texture2D)
GL.GetTexLevelParameter(TextureTarget.Texture2D, 0, GetTextureParameter.TextureInternalFormat, ft)

Debug.WriteLine(ft) ' OUTPUTS 32856 = GL_RGBA8 ???

[dipak]

Hi @squishynewt 

Thank you for reporting it. I have whitelisted you and moved the post to the OpenGL forum.

Thanks.

[dipak]

I have reported the issue to the OpenGL team. I will let you know if I get any update on this.

Thanks.

[dipak]

Just to let you know, the OpenGL team has investigated this issue and they have implemented a fix internally.

Thanks.

[dipak]

Hi @squishynewt ,

Could you please try the latest driver (Adrenalin 23.7.1 ) to check if this issue has been fixed?

Thanks.