PBR metalness material

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Related to #10

• [x] Workflow switch & metallness shader stub
• Add metal/roughness texture
  • [x] Texture
  • [x] Compound const factors: LoadFactor() + LoadTexture()
• Implement brdf: PBR metalness, Advanced mat
  • [x] Approximate using specular blinn-phong
  • [x] Draft implementation
  • [x] Presentation
  • [x] Debugging shader
  • Polish implementation: high specularity, numericals, bloom, etc.
  • [x] Fireflies and dark edges
  • [x] Black squares when bloom is on
  • Test scenes: MetalRoughSpheres, MetalRoughSpheresNoTextures
  • Appendix B: BRDF Implementation
  • Khronos Sample Viewer
  • [x] Presentation
  • Ambient integral approximation;
  • [x] Basic implementation
  • Better layering (after linear workflow #14)
    • How to combine diffuse and specular
    • Smooth Refraction Approximation Layered Model
    • Filamet: Clear Coat Model
    • Implementation
    • [x] Testing scene
    • [x] Smooth refraction approximation
    • [x] Ambient approximation
    • [x] Rough refraction approximation
    • [x] Optimization: precomputation, …
    • Presentation
      • [x] Add some nice new scene
      • [x] Increase light/exposure of scenes
      • [x] Create comparisons
      • Better view presets?
      • [x] Twitter
      • [x] Update readme.md
  • Energy conservation (#39)
• Multiply const factors within shader (do not pre-multiply)
  • Base colour
  • [x] Testing scene: three spheres – texture/factor/texture*factor
  • [x] Remove pre-multiplication
  • [x] Pass constant to shader
  • [x] Add multiplication in shader
  • [x] Metal&rough

Extras in #45

...D3DX_IsNan

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Ta daaa