Refactored buffer and texture data structures to be more simple as th…

…ere is no reason for them to mimic the Vulkan implementation. Added GPU API checklist. Next will be vertex and fragment uniform buffers.

Updated checklist

SDL_WebGPU_Checklist.md

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+# SDL WebGPU Driver Function Checklist
+
+## General
+- [x] DestroyDevice
+- [ ] SupportsSwapchainComposition
+- [ ] SupportsPresentMode
+- [x] ClaimWindow
+- [x] ReleaseWindow
+
+## Command Buffers and Fences
+- [x] AcquireCommandBuffer
+- [x] AcquireSwapchainTexture
+- [x] GetSwapchainTextureFormat
+- [x] Submit
+- [x] SubmitAndAcquireFence (Should just call Submit)
+- [x] Cancel (Should be no-op for WebGPU)
+- [x] Wait (Should be no-op for WebGPU)
+- [x] WaitForFences (Should be no-op for WebGPU)
+- [x] QueryFence (Should be no-op for WebGPU)
+- [x] ReleaseFence (Should be no-op for WebGPU)
+
+Note: WebGPU has no exposed fence API.
+
+## Buffers
+- [x] CreateBuffer
+- [x] ReleaseBuffer
+- [x] SetBufferName
+- [x] CreateTransferBuffer
+- [x] ReleaseTransferBuffer
+- [x] MapTransferBuffer
+- [x] UnmapTransferBuffer
+- [x] UploadToBuffer
+- [x] DownloadFromBuffer
+- [x] CopyBufferToBuffer
+
+Note: All functions are implemented but have not been fully tested for memory correctness. These functions simply worked as expected within the SDL_GPU example suite. Once native support is implemented, I can start running the program through Valgrind.
+
+## Textures
+- [x] CreateTexture
+- [x] ReleaseTexture
+- [x] SetTextureName
+- [x] UploadToTexture
+- [x] DownloadFromTexture (needs to be tested)
+- [x] CopyTextureToTexture (needs to be tested)
+- [ ] GenerateMipmaps
+
+## Samplers
+- [x] CreateSampler
+- [x] ReleaseSampler
+
+## Debugging
+- [ ] InsertDebugLabel
+- [ ] PushDebugGroup
+- [ ] PopDebugGroup
+
+## Graphics Pipelines
+- [x] CreateGraphicsPipeline
+- [x] BindGraphicsPipeline
+- [x] ReleaseGraphicsPipeline
+
+## Compute Pipelines
+- [ ] CreateComputePipeline
+- [ ] BindComputePipeline
+- [ ] ReleaseComputePipeline
+
+## Shaders
+- [x] CreateShader
+- [x] ReleaseShader
+
+## Rendering
+- [x] BeginRenderPass
+- [x] EndRenderPass
+- [ ] DrawPrimitivesIndirect
+- [x] DrawPrimitives
+- [x] DrawIndexedPrimitives
+- [ ] DrawIndexedPrimitivesIndirect
+
+## Copy Passes
+- [x] BeginCopyPass
+- [x] EndCopyPass
+
+## Compute Passes
+- [ ] BeginComputePass
+- [ ] EndComputePass
+- [ ] DispatchCompute
+- [ ] DispatchComputeIndirect
+- [ ] BindComputeSamplers
+- [ ] BindComputeStorageTextures
+- [ ] BindComputeStorageBuffers
+- [ ] PushComputeUniformData
+
+## Fragment Stage
+- [x] BindFragmentSamplers
+- [ ] BindFragmentStorageTextures
+- [ ] BindFragmentStorageBuffers
+- [ ] PushFragmentUniformData (IN PROGRESS)
+
+## Vertex Stage
+- [x] BindVertexBuffers
+- [x] BindIndexBuffer
+- [x] BindVertexSamplers
+- [ ] BindVertexStorageTextures
+- [ ] BindVertexStorageBuffers
+- [ ] PushVertexUniformData (IN PROGRESS)
+
+## Rendering States
+- [x] SetViewport
+- [x] SetScissor
+- [ ] SetBlendConstants
+- [x] SetStencilReference
+
+## Composition
+- [ ] Blit
+
+## Swapchains
+- [ ] SetSwapchainParameters
+- [ ] SupportsTextureFormat
+- [ ] SupportsSampleCount