Consolidate support for synchronizing to and retrieving vblank counters. Also
fix the core vblank code to return monotonic MSC counters, which are required
by some GLX extensions. Adding support for multiple pipes to a low level
driver is fairly easy, the Intel 965 driver provides simple example code (see
intel_buffers.c:intelWindowMoved()).
The new code bumps the media stream counter extension version to 2 and adds a
new getDrawableMSC callback. This callback takes a drawablePrivate pointer,
which is used to calculate the MSC value seen by clients based on the actual
vblank counter(s) returned from the kernel. The new drawable private fields
are as follows:
- vblSeq - used for tracking vblank counts for buffer swapping
- vblFlags - flags (e.g. current pipe), updated by low level driver
- msc_base - MSC counter from the last time the current pipe changed
- vblank_base - kernel DRM vblank counter from the last time the pipe changed
Using the above variables, the core vblank code (in vblank.c) can calculate a
monotonic MSC value. The low level DRI drivers are responsible for updating
the current pipe (by setting VBLANK_FLAG_SECONDARY for example in vblFlags)
along with msc_base and vblank_base whenever the pipe associated with a given
drawable changes (again, see intelWindowMoved for an example of this).
Drivers should fill in the GetDrawableMSC DriverAPIRec field to point to
driDrawableGetMSC32 and add code for pipe switching as outlined above to fully
support the new scheme.
This was causing infinite recursive calls w/ software drivers.
All vertex/fragment shaders should be allocated by calling
ctx->Driver.NewProgram(), not by calling _mesa_new_program().
The _Current field should either point to the fragment program which is to be
run (GLSL, ARB_f_p, fixed-func-generated, etc) or be NULL if conventional
fixed-function code is to be used. Matches TNL program code.
Move the CPU vertex shader execution code to the draw
module, remove traces of LLVM from the state tracker,
abstract execution engine for the purposes of the draw module.
The old supported_formats interface returned a list of formats
supported by a pipe/winsys implementation. This was reasonable
when gallium had a fixed list of predefined format.
Now things has changed and the definition of PIPE_FORMAT is
more flexible.
The new shiny is_format_supported interface gets PIPE_FORMAT
as an argument and returns a boolean whether this particular
format is supported.
