On 11/05/2013 09:44 AM, Chris Forbes wrote:
>> So, you can create a GL_LUMINANCE view of a GL_LUMINANCE texture. Hmm...
>
> My understanding is you can't actually, since views can only be
> created from immutable-format textures, and GL_LUMINANCE is not a
> sized internalformat, so it can't be used with TexStorage?
I was just using GL_LUMINANCE as shorthand for GL_LUMINANCE4,
GL_LUMINANCE8, GL_LUMINANCE12, and GL_LUMINANCE16. As far as I can tell,
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexStorage2D(GL_TEXTURE_2D,
8,
GL_LUMINANCE8,
1024, 1024);
is perfectly valid. Sayeth GL_ARB_texture_storage:
Accepted by the <internalformat> parameter of TexStorage* when
implemented on OpenGL ES:
ALPHA8_EXT 0x803C
LUMINANCE8_EXT 0x8040
LUMINANCE8_ALPHA8_EXT 0x8045
I guess that means GL_LUMINANCE4, GL_LUMINANCE12, and GL_LUMINANCE16 are
out. As are all GL_INTENSITY formats. There are still these three
legacy formats to handle.
So, if we support GL_ARB_texture_view in a compatibility profile,
glGenTextures(1, &view);
glTextureView(view,
GL_TEXTURE_2D,
tex,
GL_LUMINANCE8,
1, 1, 1, 1);
is also valid.
Right?
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