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Metal Viewport #96261

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opened 2022-03-09 12:44:49 +01:00 by Michael Parkin-White · 103 comments
Michael Parkin-White commented 2022-03-09 12:44:49 +01:00
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Status: ? Initial stages of development

Description
Bringing Metal support to the Blender viewport for optimal performance on macOS. This will be implemented as a new GPU Backend within Blender's GPU Module.

GHOST

    • Encapsulate use of OpenGL within GHOST_ContextCGL
    • Add support for Metal Backend to GHOST_ContextCGL
    • EDR (Extended Dynamic Range) support for GHOST swapchain

EEVEE Next - Workbench Next - Overlay Next

Initial bring-up

    • Add support for 2D Texture Atomics via Buffer + Implement metal path
    • Add support for virtual frame buffers (No attachments, but specified dimensions, currently allocating temporary texture for enablement).
    • EEVEE + GPU Unit tests 100% pastorate
    • EEVEE irradiance cache baking - Metal support
    • EEVEE Next shadows - Metal support

Optimisation + Later:

    • Optimize compute kernel workgroup sizes for all passes
    • Investigate kernels wherein threadgroup size requirement exceeds optimal sizing heuristic. Aim to avoid using maxTotalThreadsPerThreadgroup.
    • Ensure resource usage is optimal (compression etc)

GPU Module METAL Backend

    • MTL_backend
    • MTL_batch
    • -> Metal indirect draw support
    • MTL_capabilities
    • MTL_command_buffer
    • MTL_context
    • MTL_debug
    • MTL_drawlist
    • MTL_element
    • MTL_extensions (via backend)
    • MTL_framebuffer
    • MTL_immediate
    • MTL_memory_manager
    • MTL_query
    • MTL_shader
    • MTL_shader_interface
    • MTL_state
    • MTL_storage_buf
    • MTL_texture
    • MTL_uniformbuffer
    • MTL_vertex_buffer
    • Compute support for Metal

More items to be added as necessary.

GPU Feature coverage

A number of features available in Blender require API functionality which is either not directly available in the Metal API, such as geometry shaders, or requires a higher degree of explicitness from the high-level renderer. These tasks represent non-invasive changes required to enable full Metal support:

    • GPU - Geometry shader workflow alternative
    • GPU - Multi-layered rendering support in Vertex Shader
    • GPU - Shading language translation layer from GLSL to MSL (Metal Shading Language).
    • GPU - Shader uniform struct alignment validation for Metal (GPU_uniformbuf_create_from_list)
    • GPU - Shader barycentric support in Metal.
    • GPU - default depth format support checks (Apple Silicon does not support GPU_DEPTH24_STENCIL8)
    • GPU - Lightweight GLSL shader requirements for MSL compatibility.
    • GPU - Extended Dynamic Range (EDR) support for OCIO shaders and GPUViewport.
    • #104025 Offline Metal shader compilation - Startup compilation time and system caching.
    • Metal/DRW - EEVEE/Material PSO (Pipeline State Object) parallel compilation.

Shader libraries compile (Front-end compilation) in parallel while displaying the default EEVEE material. For Metal (and likely Vulkan too), PSO compilation (backend/low-level compilation) happens on demand, depending on the current render pipeline state in combination with a given shader, and this can take time, introducing stalls and stutters, such as when an object is first selected and the select-engine/depth-only permutation is generated for that particular mesh.

Ideally we would want to avoid these one-off PSO stalls, which for OpenGL, are generally hidden behind driver processing. Propose a few options:

  • Option to add a "default/fallback shader to a GPUShader such that if it needs a fresh PSO, and a default shader/fallback is provided, it can instead bind that shader for the draw. In essence, continue using the EEVEE default material, if PSO compilation is needed, not only when the shader library is compiling.
  • Shader PSO cache warming: Generate the render pipeline state configurations/permutations up-front to allow background parallel PSO compilation. This could be done by performing a dry-run of Blender and packaging a data-file containing the serialized input structure for the PSO compilation function, and performing background warming after start-up, using this data. This avoids the need to manually specify the configs.
  • Prepare certain configurations up-front in background by performing dummy renders in different states, and skipping draws which trigger a PSO compilation. This allows the dynamic render state to be set, without performing rendering.
    • Metal viewport/Metal Cycles shader compiler load distribution manager.

As both backends use Metal, there is only a fixed pool of shader compilation threads available. A mechanism should be in place to ensure compilation is not stalled, which could cause the viewport to become unresponsive for synchronous shader compilations. e.g. PSO backend compilations.

Relevant links:

**Status:** `?` Initial stages of development --- **Description** Bringing Metal support to the Blender viewport for optimal performance on macOS. This will be implemented as a new GPU Backend within Blender's GPU Module. **GHOST** * - [x] Encapsulate use of OpenGL within GHOST_ContextCGL * - [x] Add support for Metal Backend to GHOST_ContextCGL * - [x] EDR (Extended Dynamic Range) support for GHOST swapchain **EEVEE Next - Workbench Next - Overlay Next** Initial bring-up * - [x] Add support for 2D Texture Atomics via Buffer + Implement metal path * - [ ] Add support for virtual frame buffers (No attachments, but specified dimensions, currently allocating temporary texture for enablement). * - [ ] EEVEE + GPU Unit tests 100% pastorate * - [x] EEVEE irradiance cache baking - Metal support * - [x] EEVEE Next shadows - Metal support Optimisation + Later: * - [ ] Optimize compute kernel workgroup sizes for all passes * - [ ] Investigate kernels wherein threadgroup size requirement exceeds optimal sizing heuristic. Aim to avoid using maxTotalThreadsPerThreadgroup. * - [ ] Ensure resource usage is optimal (compression etc) **GPU Module METAL Backend** * - [x] MTL_backend * - [x] MTL_batch * - [x] -> Metal indirect draw support * - [x] MTL_capabilities * - [x] MTL_command_buffer * - [x] MTL_context * - [x] MTL_debug * - [x] MTL_drawlist * - [x] MTL_element * - [x] MTL_extensions (via backend) * - [x] MTL_framebuffer * - [x] MTL_immediate * - [x] MTL_memory_manager * - [x] MTL_query * - [x] MTL_shader * - [x] MTL_shader_interface * - [x] MTL_state * - [x] MTL_storage_buf * - [x] MTL_texture * - [x] MTL_uniformbuffer * - [x] MTL_vertex_buffer * - [x] Compute support for Metal More items to be added as necessary. **GPU Feature coverage** A number of features available in Blender require API functionality which is either not directly available in the Metal API, such as geometry shaders, or requires a higher degree of explicitness from the high-level renderer. These tasks represent non-invasive changes required to enable full Metal support: * - [x] GPU - Geometry shader workflow alternative * - [x] GPU - Multi-layered rendering support in Vertex Shader * - [x] GPU - Shading language translation layer from GLSL to MSL (Metal Shading Language). * - [x] GPU - Alternatives for unsupported GPU Primitive types: `GPU_PRIM_TRI_FAN`/`GPU_PRIM_LINE_LOOP` (https://developer.apple.com/documentation/metal/mtlprimitivetype?language=objc) * - [x] GPU - Shader uniform struct alignment validation for Metal (`GPU_uniformbuf_create_from_list`) * - [x] GPU - Shader barycentric support in Metal. * - [x] GPU - default depth format support checks (Apple Silicon does not support `GPU_DEPTH24_STENCIL8`) * - [x] GPU - Lightweight GLSL shader requirements for MSL compatibility. * - [x] GPU - Extended Dynamic Range (EDR) support for OCIO shaders and GPUViewport. * - [x] DRW/GPU/COM - Support for Realtime compositor (https://developer.blender.org/T99210) * - [ ] #104025 Offline Metal shader compilation - Startup compilation time and system caching. * - [ ] Metal/DRW - EEVEE/Material PSO (Pipeline State Object) parallel compilation. > Shader libraries compile (Front-end compilation) in parallel while displaying the default EEVEE material. For Metal (and likely Vulkan too), PSO compilation (backend/low-level compilation) happens on demand, depending on the current render pipeline state in combination with a given shader, and this can take time, introducing stalls and stutters, such as when an object is first selected and the select-engine/depth-only permutation is generated for that particular mesh. > > Ideally we would want to avoid these one-off PSO stalls, which for OpenGL, are generally hidden behind driver processing. Propose a few options: > - Option to add a "default/fallback shader to a **GPUShader** such that if it needs a fresh PSO, and a default shader/fallback is provided, it can instead bind that shader for the draw. In essence, continue using the EEVEE default material, if PSO compilation is needed, not only when the shader library is compiling. > - Shader PSO cache warming: Generate the render pipeline state configurations/permutations up-front to allow background parallel PSO compilation. This could be done by performing a dry-run of Blender and packaging a data-file containing the serialized input structure for the PSO compilation function, and performing background warming after start-up, using this data. This avoids the need to manually specify the configs. > - Prepare certain configurations up-front in background by performing dummy renders in different states, and skipping draws which trigger a PSO compilation. This allows the dynamic render state to be set, without performing rendering. * - [x] Metal viewport/Metal Cycles shader compiler load distribution manager. > As both backends use Metal, there is only a fixed pool of shader compilation threads available. A mechanism should be in place to ensure compilation is not stalled, which could cause the viewport to become unresponsive for synchronous shader compilations. e.g. PSO backend compilations. ``` ``` * - [x] Python -- Use of OpenGL within Python API - Ensure safe fallback (https://developer.blender.org/T103863) * - [x] Cycles - Live viewport display -- Currently uses OpenGL directly --- **Relevant links**: * `-` https://developer.apple.com/metal/Metal-Shading-Language-Specification.pdf * `-` https://developer.apple.com/metal/ * `-` https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf
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Michael Parkin-White commented 2022-03-09 12:44:49 +01:00
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Philipp Oeser commented 2022-03-09 13:37:19 +01:00
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Philipp Oeser commented 2022-03-09 13:37:19 +01:00
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Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'
Philipp Oeser commented 2022-03-09 13:37:19 +01:00
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Guess this can be confirmed (it was still in the Needs Triage status)?

Guess this can be confirmed (it was still in the `Needs Triage` status)?
Brecht Van Lommel commented 2022-03-09 14:58:17 +01:00
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Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'
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This issue was referenced by cd2926fb05b0179a405a5406d6b87f5bff36d15a
blender-admin commented 2023-01-23 17:32:22 +01:00
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This issue was referenced by 0ba5954bb2

This issue was referenced by 0ba5954bb27b4fee5d0ed1a14feb91118b6f3fad
blender-admin commented 2023-01-23 17:40:44 +01:00
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This issue was referenced by 1c672f3d1d

This issue was referenced by 1c672f3d1dae4f79d327c0fd38c440f3bf23d35c
blender-admin commented 2023-01-23 17:46:28 +01:00
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This issue was referenced by 139fb38d4f

This issue was referenced by 139fb38d4fb4317a467a0abd28557f1713eb15af
blender-admin commented 2023-01-23 17:47:11 +01:00
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This issue was referenced by 84c25fdcaa

This issue was referenced by 84c25fdcaa42ae1ac7a937d4021095273f08603d
blender-admin commented 2023-01-30 11:00:26 +01:00
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This issue was referenced by 57552f52b2

This issue was referenced by 57552f52b2987adfd1525c3e4109565e3641ef5d
blender-admin commented 2023-01-30 11:25:53 +01:00
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This issue was referenced by 6dde185dc4

This issue was referenced by 6dde185dc470498d3eb2676a96728b5aef5e60ed
blender-admin commented 2023-01-30 13:44:46 +01:00
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This issue was referenced by 596ee79a9f

This issue was referenced by 596ee79a9f590c1d66aa1cb5c19f994ddb0f0272
blender-admin commented 2023-01-30 14:05:29 +01:00
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This issue was referenced by aca9c131fc

This issue was referenced by aca9c131fc812697575288e7ab3e2946ad62bddd
blender-admin commented 2023-01-31 10:56:13 +01:00
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This issue was referenced by f3bd5458a3

This issue was referenced by f3bd5458a39b7ebd397dac10c8555a4c9fbc7409
blender-admin commented 2023-01-31 11:06:16 +01:00
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This issue was referenced by a504058dee

This issue was referenced by a504058dee7684758456aaac24342ae24df3f3a1
blender-admin commented 2023-02-07 00:51:06 +01:00
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This issue was referenced by f152159101

This issue was referenced by f1521591017faac334ff78c291ad66bdaf327661
blender-admin commented 2023-02-07 00:57:54 +01:00
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This issue was referenced by 8703db393b

This issue was referenced by 8703db393bfb5290777c59ef29b43d485bcfb80e
Clément Foucault added this to the EEVEE & Viewport project 2023-02-09 01:08:48 +01:00
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