X-Moto: game-side batching beat the driver rounds (2026-10-17)

Symptom. X-Moto, a 2D game, played at 35-47 fps: a GL 1.x game held back by the PPE. The Mesa rounds moved it a little each: ps3.246 35 to 37 (HUD median, underruns 208 to 126), ps3.262 39 to 47 (+21%, batch 2026-10-17-mesa-262), and ps3.299 cost 5% against ps3.282 in the same boot (44.5 against 47.0; neither 0027 nor 0030 off restored it, 0031 off and 0028 off gave 46 each, batch 2026-10-17-mesa-282-ab). A fixed kick100 cost 9% (batch 2026-10-17-mesa-282-kick100).

Evidence. The host count: 18,500 GL calls and 1,960 draws a frame. DrawLib set its GL state for every primitive and drew the level’s blocks and edges one by one.

Fix. 0001 sets DrawLib’s state only when drawing and batches its primitives per state run; 0002 draws the level’s blocks and edges from one buffer: 165 calls and 40 draws a frame, the picture identical. On the RSX: 44.5 to 166.5 fps (nobatch against base, same boot, batch 2026-10-17-xmoto-etr-batching), 3.7x. The lesson for every game: fewer GL calls in the game beat driver work, where the PPE is the limit.