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Bound GPU backbuffer layer retention

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gamer147
2026-07-30 11:49:14 -04:00
parent 2ba0870967
commit 499e72d4bb
5 changed files with 84 additions and 30 deletions
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6
vm-map/opcodes.toml
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@@ -5227,13 +5227,13 @@ abi_source = "kelebek+decode-validated"
[opcode.semantics]
name = "present-frame"
category = "draw"
summary = "Present the composited frame; label_1235a uses this on the read/message-skip branch to expose the completed foreground endpoint immediately."
details = "Native handler gfx_op_0x20c_present_frame -> gfx_render_frame @0x4820b0. This is an explicit retained-state publication boundary, not a continuously visible object-store mutation. The read/message-skip branch resets the animation service then presents; the port publishes and snaps pending 0x223 state here. Normal playback branches to 0x21c, which owns repeated render/wait/resume. Headless hosts remain non-blocking."
summary = "Draw every visible retained object over the selected target without implicitly clearing it, then present the composited backbuffer; label_1235a uses this on the read/message-skip branch to expose the completed foreground endpoint immediately."
details = "Native handler gfx_op_0x20c_present_frame -> gfx_render_frame @0x4820b0. This is an explicit retained-state publication boundary, not a continuously visible object-store mutation. The renderer does not clear its selected target: opcode 0x20e owns explicit black clearing, so full-frame publication preserves preceding target pixels beneath its redraw. The read/message-skip branch resets the animation service then presents; the port publishes and snaps pending 0x223 state here. Normal playback branches to 0x21c, which owns repeated render/wait/resume. Headless hosts remain non-blocking."
noop_headless = false
source = "investigation"
confidence = "high"
depends_on = [0x223, 0x1c7, 0x1cc]
evidence = "Ghidra: dispatch table FUN_00413860 param_1[0x26e9f]=gfx_op_0x20c_present_frame; 0x26e9f-0x26c93=0x20c. 2026-07-08."
evidence = "Ghidra /v2: dispatch table FUN_00413860 param_1[0x26e9f]=gfx_op_0x20c_present_frame; 0x26e9f-0x26c93=0x20c. The handler calls gfx_render_frame@0x4820b0, which begins a D3D scene, consumes queued surface commands, draws all visible retained objects, ends the scene, and presents the backbuffer without calling d3d_clear_render_target_black; opcode 0x20e is the separate clear. Refined 2026-07-30."
[[opcode]]
op = 0x20d