Felix Kühling wrote:
Hi,I tracked down a problem that caused the rpm and speed meters in Torcs to be invisible if TCL was disabled. I think it boils down to a missing radeonEmitState. It is possible that radeonEmitState is not called after ValidateState has updated the state atoms and before the first primitive with the new state is emitted. Adding a radeonEmitState at the end of radeonValidateState fixes the problem but I'm not sure this is the right place. It also fixes a flashing texture problem reported with Quake3 (on Radeon VE or with TCL disabled) a long time ago. In many cases, especially with TCL enabled there seem to be enough radeonEmitState and RADEON_FIREVERTICES calls scattered throughout the driver to never cause problems. Maybe some of them are no longer necessary if state is emitted in radeonValidataState.
I'll have a look at the demo in a sec.
The idea of radeonEmitState is that it should be called immediately prior to any rendering command -- eg firing vertices, clearing buffers or maybe even swapping buffers. These correspond to radeonEmitVbufPrim & radeonAllocEltsOpenEnded (which actually starts a render packet), radeonClear(), and radeonCopyBuffers/radeonPageFlip.
The only one of these that doesn't call radeonEmitState is the swapbuffers code -- radeonCopyBuffers/radeonPageFlip.
Anyway, the point of the state system is to gather as many statechanges as possible into the dirty list and then emit them all at once at the last possible moment before we send something to the hardware that actually relies on that state. It seems that at some point we must be forgetting to do this - or perhaps that turning of tcl somehow breaks this process.
I'll have a play with the demo & see what I can find.
Keith
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