* LibGL now supports the `GL_NORMALIZE` capability
* LibSoftGPU transforms and normalizes the vertices' normals
Normals are heavily used in texture coordinate generation, to be
implemented in a future commit.
In the OpenGL fixed function pipeline, alpha testing should happen
before depth testing and writing. Since the tests are basically boolean
ANDs, we can reorder them however we like to improve performance and as
such, we perform early depth testing and delay the more expensive alpha
testing until we know which pixels to test.
However, we were already writing to the depth buffer during the depth
test, even if the alpha test fails later on. Depth writing should only
happen if depth testing _and_ writing is enabled.
This change introduces depth staging, deferring the depth write until
we are absolutely sure we should do so.
According to the documentation, we should switch around vertices every
other triangle to prevent front-face culling from removing them.
This allows Tux in Tux Racer to render correctly.
This adds a method `info()` to SoftGPU that returns the name of the
hardware vendor and device name, as well as the number of texture untis.
LibGL uses the returned texture unit count to initialize its internal
texture unit array.
Replaces the GLenum used in RasterizerConfig to select the draw buffer
with a simple boolean that disabled color output when the draw buffer
is set to GL_NONE on the OpenGL side.
We now sample textures from the device owned image samplers.
Passing of enabled texture units has been simplified by only passing a
list of texture unit indices.
