Linear workflow

[ivokabel]

Related to #11

• Gamma removal
  • [x] glTF textures
  • [x] Metalnes material: glossy coating in non-metal is too bright? just for ambient light??
  • [x] Direct textures
  • ~Pre-multiply textures by const color factors (only if not handled directly within the shader)~
  • Per-vertex values?
• [x] Gamma restoration
  • RTV auto conversion?
  • ~Final shader step?~

Resources:

• Wikipedia: Gamma correction
• DXGI
  • ~Using gamma correction (reading)~
  • Converting data for the color space
  • DXGI_FORMAT
• D3D10: Data Conversion Rules
• Stack exchange:
  • Vectorizing sRGB to linear conversion
  • Gamma-Correct rendering without floating-point rendertargets
• Molecular Musings: Gamma-correct rendering
• Nvidia: GPU Gems 3: Chapter 24. The Importance of Being Linear
• Understanding Gamma Correction
• What every coder should know about gamma

Testing:

• [x] Simple shading: sphere, simple material, simple lighting
• Constants
  • Vertex color blending
  • Rough/metal spheres under pure ambient light (various intensities: 0.25, 0.50, 0.75?, 1.00)
  • Vertex metalness parameters blending
• Loaded from Textures
  • ~Quad with gradient (linear in sRGB) under pure ambient light (various intensities: 0.25, 0.50, 0.75?, 1.00)~
  • [x] Sphere with pure diffuse texture with horizontal black-white waves, just directional light
  • ...
• glTF data
  • [x] Rough/metal spheres with various light types
• Per-vertex colors blending