Metal Support

[TheSpydog]

Tracking the remaining work on the Metal backend here...

Examples:

• [x] ClearScreen
• [x] ClearScreenMultiWindow
• [x] BasicTriangle
• [x] BasicVertexBuffer
• [x] CullMode
• [x] BasicStencil
• [x] InstancedIndexed
• [x] TexturedQuad
• [x] TexturedAnimatedQuad
• [ ] BasicCompute
• [ ] ComputeUniforms
• [ ] ToneMapping

Functions:

• [ ] SetGpuBufferName
• [ ] SetTextureName
• [ ] SetStringMarker
• [x] MapTransferBuffer
• [x] UnmapTransferBuffer
• [ ] GetTransferData
• [ ] CopyBufferToBuffer
• [ ] GenerateMipmaps
• [ ] DownloadFromTexture
• [ ] DownloadFromBuffer
• [x] BindVertexSamplers
• [ ] BindVertexStorageTextures
• [ ] BindVertexStorageBuffers
• [x] BindFragmentSamplers
• [ ] BindFragmentStorageTextures
• [ ] BindFragmentStorageBuffers
• [ ] DrawPrimitivesIndirect
• [x] PushVertexUniformData
• [x] PushFragmentUniformData
• [ ] PushComputeUniformData
• [x] Blit
• [ ] CreateComputePipeline
• [ ] ReleaseComputePipeline
• [ ] BeginComputePass
• [ ] BindComputePipeline
• [ ] BindComputeStorageTextures
• [ ] BindComputeStorageBuffers
• [ ] DispatchCompute
• [ ] EndComputePass
• [ ] QueryFence
• [ ] SupportsSwapchainComposition
• [x] SetSwapchainParameters
• [ ] CreateOcclusionQuery
• [ ] OcclusionQueryBegin
• [ ] OcclusionQueryEnd
• [ ] OcclusionQueryPixelCount
• [ ] ReleaseOcclusionQuery

[flibitijibibo]

We're doing future commits in the gpu branch directly, moved the checklist back over to the issue.