[jcelerier]

Three Qt patches found while testing score's shader pipeline on D3D, Metal and Vulkan.

qtshadertools 0003: HLSL gl_NumWorkGroups through a constant buffer

qtshadertools never calls SPIRV-Cross's remap_num_workgroups_builtin(), so a compute shader that reads gl_NumWorkGroups cannot be baked for HLSL (D3D11/D3D12).

• QShaderBaker::setHlslNumWorkGroupsBinding(int) makes the remap opt-in; nothing changes for shaders that don't set it.
• The added cbuffer is reported in the native resource binding map, so QRhi can bind it.
• QT_SHADERTOOLS_HAS_HLSL_NUM_WORKGROUPS_BINDING lets score detect the patched build.

Applies after 0001/0002 on the pinned qtshadertools (4e195e12c7); checked with git apply --check and against the pinned SPIRV-Cross sources. The score side (filling the cbuffer, including for indirect dispatch) comes in a separate score PR and needs a Windows test run.

qtbase 0015: Metal length() reads the sizes of its own draw or dispatch

QRhiMetal rewrote one per-pipeline buffer-size buffer in place on every setShaderResources, so all draws and dispatches recorded with a pipeline in a frame read the storage buffer sizes of the last one. Each call now gets its own region, per frame slot.

score's test_gfx_csf_every_mesh: 24/216 assertions failed on Metal with the continuous SDK, all pass with the patch; 83 other storage, CSF, indirect, raw raster and scene tests unchanged.

qtbase 0016: Vulkan offscreen render passes wait for previous attachment writes

A texture render target's render pass had no external subpass dependency, so the UNDEFINED → attachment layout transition did not chain after the resource-tracking barrier and raced the previous pass's writes to the same image (SYNC-HAZARD-WRITE-AFTER-WRITE at vkCmdBeginRenderPass whenever a frame renders twice into one target).

score on Vulkan with synchronization validation, Linux debug Qt with the patch: 7 tests lose all their validation errors (raw_raster_input_buffer_count 690 → 0, raw_raster_aux_count 575 → 0, selffb_depth_grab, per_layer_depth, raw_raster_depth_array_input, raster_layer_queue, gltf_light_shadows); 84 other render-target tests unchanged.

🤖 Generated with Claude Code

https://claude.ai/code/session_01JeL19ofVgPe9u9q7J1V9ex