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- MGPShaderBuffers::WritableMask is Uint32[3] and the POD grows 32 -> 40 (ID-104). One Uint32 could describe only the first 32 of an 84-point window, so a storage buffer bound at point 32 or above read as unwritable with nothing able to see it; the ruling widens the field rather than narrowing the window, which would change what an application may bind. MGPipeShaderBufferMaskHas / ...Set are the one spelling of the mask, so the emitter, the applier and the four backend sites cannot disagree about which word a point lives in. - MGPipeApplySetShaderBuffers has its body: per-class window, Start/Count validated against the capacity, the mask copied by word, ONE ShaderBuffersSerial advanced on every applied record and ADVANCED - never zeroed - by both resets, which also clear the three windows. - Route rows for opcode 38 on both arms (Mono_ and Wire_) and the server sink in the wire codec's decode switch, which is where a kCtxState row's sink lives - PipeApplier.cpp's ServerVerbSink has no method for it and the brief's "OnSetShaderBuffers" names no code. The codec also bounds Class and Start+Count where Count becomes a byte length. - New MG_Impl/Pipe/ShaderBufferEmit.h: one record per class, window = the touched high-water mark clamped to 84, zero early-out before any hash, a BASE binding travelling as kMGPipeWholeBuffer so the server re-resolves the extent at use, three suppressor slots (ruling 11), and the writable mask that replaces the backend's GPU-write walk. - BufferState gains a per-target bind-point generation (push-only, G1) and dirty bits 15/16/17 shutter on it instead of the buffer CONTENT aggregate. That aggregate answered the wrong question in both directions: any glBufferSubData fired all three, and glBindBufferBase fired none of them, because it mutates a binding point through a returned reference. Same defect class as P4a's glBindSampler hole. - Init.cpp publishes consumer bit 13 for DirectGLES and not for Magma (ID-106), in the same commit as the wired constant, and PipeFill's liveness gate asks R-8 for bit 13 in particular plus bit 13-requires-bit-7. - `Touch` joins the dirty-surface scanner's mutator prefixes; TouchBufferBindingPoint gets its row and SetNamedTransformFeedbackBinding's is rewritten now that bit 17 reads a generation a binding moves. Negative control 6 is re-pointed: the pair it used to refute is a live answer, and a control that has quietly become positive is what the self-test is for.