softgpu: Process rasterization in screen space, rather than drawing space.
Adjust windows size based on renderWidth/renderHeight
Merge pull request #4 from raven02/softgpu2

Adjust windows size based on renderWidth/renderHeight
Fix compilation on VS2010. No VLA!
Optimize a bit the softgpu.
Rename TransformPipeline from softgpu to TransformPipelineSoftware

Fixes OSX compilation.