softgpu/Rasterizer: Fix decal texfunc.
softgpu/Rasterizer: Fix (or rather workaround) a critical integer overflow issue.
softgpu: Fix vertex order when drawing rectangles.
softgpu: Fix (?) interpolation method for z and color values.
softgpu: Adjust render window to window size...
softgpu: Cleanup CLUT lookup code and fix a critical bug related to it. Also added semi-working fast texture storage mode support.
softgpu: Implement stencil testing. Add some TODOs. Disable alpha blending when clear mode is active.
GPUState: Fix incorrect stencil enum.
softgpu: Fix fast texture storage mode and use correct texture buffer pitches.
softgpu/Rasterizer: Clean up texture sampling code.
softgpu: Possibly fix a bug. Or make things worse. I don't know :/
softgpu: Fix some alpha blending bugs.