Floating point internal frame buffer and pixel shaders (directx)

[GoogleCodeExporter]

We can have an internal floating point frame buffer, regardless of the back
buffer format. To do that, we should use a texture and render it as a quad
on the back buffer.

This will allow the use of pixel shaders for tonemapping and gamma
correction (finally ;)

Rendering the frame buffer as a quad will also allow us using odd
resolutions in full screen mode.

Original issue reported on code.google.com by bram.deg...@gmail.com on 1 Aug 2007 at 12:41

[GoogleCodeExporter]

The first part of the changes has been committed to the trunk (r134): floating 
point
frame buffers.  Even if the backbuffer is true color, we can create an floating 
point
texture as frame buffer and render it as a quad.

Original comment by bram.deg...@gmail.com on 3 Aug 2007 at 8:17