v0.3.0-alpha.3

Added:

• Custom vertex shaders:
  • DrawTriangles<T> (draws triangles with a custom vertex type)
  • ICanvas.Fill() overloads which accept a VertexShader (see the RenderCube example)
• Compute shaders (via ComputeShader and Graphics.Dispatch)
• Vertex shaders accept custom vertex data via a field with a VertexDataAttribute
• Vertex shaders can pass values to the canvas shader (fragment shader) via a field with a VertexShaderOutputAttribute

Fixed:

• Reimplemented gradients as canvas shaders
• Shader array alignment issues
• Various other bugs and crashes

Known Issues:

• anti aliasing doesn't work when rendering to a texture
• jump statements cause shader compilation errors (early returns, continue, break, etc)
• Texture saving is not yet supported
• Self-Intersecting polygons are not triangulated properly