Map more limits in WebGPU (gfx-rs#8328)

Author: evilpie

CHANGELOG.md

@@ -83,6 +83,7 @@ SamplerDescriptor {
 #### General
 
 - Reject fragment shader output `location`s > `max_color_attachments` limit. By @ErichDonGubler in [#8316](https://github.com/gfx-rs/wgpu/pull/8316).
+- WebGPU device requests now support the required limits `maxColorAttachments` and `maxColorAttachmentBytesPerSample`. By @evilpie in [#8328](https://github.com/gfx-rs/wgpu/pull/8328)
 
 ## v27.0.2 (2025-10-03)
 

wgpu/src/backend/webgpu.rs

@@ -858,13 +858,15 @@ fn map_js_sys_limits(limits: &wgt::Limits) -> js_sys::Object {
         }
     }
 
+    // https://gpuweb.github.io/gpuweb/#gpusupportedlimits
     set_properties![
         (limits) => (object):
         (maxTextureDimension1D, max_texture_dimension_1d),
         (maxTextureDimension2D, max_texture_dimension_2d),
         (maxTextureDimension3D, max_texture_dimension_3d),
         (maxTextureArrayLayers, max_texture_array_layers),
         (maxBindGroups, max_bind_groups),
+        // TODO: (maxBindGroupsPlusVertexBuffers, max_bind_groups_plus_vertex_buffers),
         (maxBindingsPerBindGroup, max_bindings_per_bind_group),
         (maxDynamicUniformBuffersPerPipelineLayout, max_dynamic_uniform_buffers_per_pipeline_layout),
         (maxDynamicStorageBuffersPerPipelineLayout, max_dynamic_storage_buffers_per_pipeline_layout),
@@ -881,6 +883,9 @@ fn map_js_sys_limits(limits: &wgt::Limits) -> js_sys::Object {
         (maxBufferSize, max_buffer_size),
         (maxVertexAttributes, max_vertex_attributes),
         (maxVertexBufferArrayStride, max_vertex_buffer_array_stride),
+        // TODO: (maxInterStageShaderVariables, max_inter_stage_shader_variables),
+        (maxColorAttachments, max_color_attachments),
+        (maxColorAttachmentBytesPerSample, max_color_attachment_bytes_per_sample),
         (maxComputeWorkgroupStorageSize, max_compute_workgroup_storage_size),
         (maxComputeInvocationsPerWorkgroup, max_compute_invocations_per_workgroup),
         (maxComputeWorkgroupSizeX, max_compute_workgroup_size_x),