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SubjectRe: [Linux-fbdev-devel] Re: [PATCH] fbdev: colormap fixes
On 7/28/05, Jon Smirl <> wrote:
> On 7/28/05, Geert Uytterhoeven <> wrote:
> > On Thu, 28 Jul 2005, Jon Smirl wrote:
> > > I can't see a way to query how long of cmap the device supports using
> > > the current fbdev ioctls.
> >
> > Look at the lengths of the color bitfields?
> Which color bitfields? Does hardware that supports 10bit cmap also
> support a 10:10:10 framebuffer? If you can't do 10:10:10 how do the
> 10bit cmaps work? Does alpha matter in a 10:10:10 scanout buffer?

From the OpenGL headers I can see the answer to my questions...
#define GL_RGB10 0x8052
#define GL_RGB10_A2 0x8059

OpenGL supports all of these:
#define GL_RGB10 0x8052
#define GL_RGB12 0x8053
#define GL_RGB16 0x8054
#define GL_RGB10_A2 0x8059
#define GL_RGBA12 0x805A
#define GL_RGBA16 0x805B

Are there 12 and 16 bit cmaps too?

Jon Smirl
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