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swung0x48
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Make GL_PRIMITIVE_RESTART[_FIXED_INDEX] actually take effect at draw time, following the detect-at-init / POST / fallback-or-hard-fail discipline. DirectVulkan: - Thread primitiveRestartEnable through the pipeline (payload + hash + input-assembly), set from the GL_PRIMITIVE_RESTART / _FIXED_INDEX caps. - Detect and enable primitiveTopologyListRestart (VK_EXT_primitive_topology_list_restart) at device creation; cache it. Strip/fan restart needs no feature; a *list* topology with restart and no feature hard-fails at the draw with the reason. - Vulkan only restarts on the fixed all-ones index value, so an arbitrary GL_PRIMITIVE_RESTART index that is not that value hard-fails in UploadAndBindIndexBuffer (where the index type is known). - Also detect+enable and cache the dualSrcBlend base feature (groundwork for GL_SRC1_* dual-source blending). DirectGLES: - Sync GL_PRIMITIVE_RESTART_FIXED_INDEX from either restart cap (GLES core has only the fixed-index form); an arbitrary non-fixed index hard-fails in the indexed draw paths with the reason. POST: dualSrcBlend and primitiveTopologyListRestart capability rows (Pass when supported, Warn with the fallback/hard-fail consequence otherwise). Library builds clean; SanityTest 31/31. (The actual restart rendering and the hard-fail paths need a real GPU and are not runtime-testable here.)