sokol-gfx TODO

[floooh]

General

• update oryol-shdc with latest SPIRVCross
• cleanup vertex declaration bind slot "guessing":
  • sokol_gfx vertex declaration in sg_pipeline_desc must be changed to flat attributes array and separate layouts array (see MTLVertexDescriptor), this clarifies the attribute location (which is the location in the attributes array)
  • the attribute bind slot must be handed from the shader code generation into the ShaderDesc
  • remove the 'automagic' attribut slot guessing in Metal and D3D11

D3D11:

• DDSTextureLoading not working (error when creating one of the textures)
• FullscreenQuad: rendering broken (also in master branch?)
• GPUParticles+TextureFloat+VertexTexture: D3D11 validation error when trying to clear nullptr DepthStencilView