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Compat: fix GL computation of storage limits #5029

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Compat: fix GL computation of storage limits #5029

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97064a4
Compat: fix GL computation of storage limits
kainino0x Dec 19, 2024
42219e5
storage texture limits
kainino0x Dec 21, 2024
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7 changes: 5 additions & 2 deletions proposals/compatibility-mode.md
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Original file line number Diff line number Diff line change
Expand Up @@ -107,15 +107,18 @@ During `createRenderPipeline()` and `createRenderPipelineAsync()`, `GPUDepthSten
The differences in limits between compatibility mode and standard WebGPU
are as follows


| limit | compat | standard | gl limit |
| :---------------------------------- | ------: | --------: | :------------------------------------------- |
| `maxColorAttachments` | 4 | 8 | min(MAX_COLOR_ATTACHMENTS, MAX_DRAW_BUFFERS) |
| `maxComputeInvocationsPerWorkgroup` | 128 | 256 | MAX_COMPUTE_WORK_GROUP_INVOCATIONS |
| `maxComputeWorkgroupSizeX` | 128 | 256 | MAX_COMPUTE_WORK_GROUP_SIZE |
| `maxComputeWorkgroupSizeY` | 128 | 256 | MAX_COMPUTE_WORK_GROUP_SIZE |
| `maxInterStageShaderVariables` | 15 | 16 | MAX_VARYING_VECTORS |
| `maxStorageBuffersPerShaderStage` | 4 | 8 | min(GL_MAX_SHADER_STORAGE_BUFFER_BINDINGS, GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS, GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS, GL_MAX_COMPUTE_SHADER_STORAGE_BLOCKS) |
| `maxStorageBuffersPerShaderStage` | 4 | 8 | min(MAX_SHADER_STORAGE_BUFFER_BINDINGS, MAX_COMPUTE_SHADER_STORAGE_BLOCKS) |
| `maxStorageBuffersInVertexStage` | 0 | (ignored) | min(MAX_SHADER_STORAGE_BUFFER_BINDINGS, MAX_VERTEX_SHADER_STORAGE_BLOCKS) (see restriction 18) |
| `maxStorageBuffersInFragmentStage` | 0 | (ignored) | min(MAX_SHADER_STORAGE_BUFFER_BINDINGS, MAX_FRAGMENT_SHADER_STORAGE_BLOCKS) (see restriction 19) |
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| `maxStorageTexturesInVertexStage` | 0 | (ignored) | TODO (see restriction 18) |
| `maxStorageTexturesInFragmentStage` | 0 | (ignored) | TODO (see restriction 19) |
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| `maxTextureDimension1D` | 4096 | 8192 | MAX_TEXTURE_SIZE |
| `maxTextureDimension2D` | 4096 | 8192 | MAX_TEXTURE_SIZE |
| `maxUniformBufferBindingSize` | 16384 | 65536 | MAX_UNIFORM_BLOCK_SIZE |
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