On Mon, 5 Dec 2011 09:40:44 -0800, Paul Berry <stereotype...@gmail.com> wrote: > This patch adds a new bit to the ctx->NewState bitfield, > _NEW_TRANSFORM_FEEDBACK, to track state changes that affect > ctx->TransformFeedback. This bit can be used by driver back-ends to > avoid expensive recomputations when transform feedback state has not > been modified. > --- > src/mesa/main/mtypes.h | 1 + > src/mesa/main/transformfeedback.c | 9 ++++++++- > 2 files changed, 9 insertions(+), 1 deletions(-) > > diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h > index 33b00c6..fc494f7 100644 > --- a/src/mesa/main/mtypes.h > +++ b/src/mesa/main/mtypes.h > @@ -3051,6 +3051,7 @@ struct gl_matrix_stack > #define _NEW_PROGRAM_CONSTANTS (1 << 27) > #define _NEW_BUFFER_OBJECT (1 << 28) > #define _NEW_FRAG_CLAMP (1 << 29) > +#define _NEW_TRANSFORM_FEEDBACK (1 << 30) /**< gl_context::TransformFeedback > */ > #define _NEW_ALL ~0 > /*@}*/ > > diff --git a/src/mesa/main/transformfeedback.c > b/src/mesa/main/transformfeedback.c > index 11abd03..a1809db 100644 > --- a/src/mesa/main/transformfeedback.c > +++ b/src/mesa/main/transformfeedback.c > @@ -376,6 +376,7 @@ _mesa_BeginTransformFeedback(GLenum mode) > return; > } > > + ctx->NewState |= _NEW_TRANSFORM_FEEDBACK; > obj->Active = GL_TRUE; > ctx->TransformFeedback.Mode = mode;
These statechanges should probably be flagged using FLUSH_VERTICES(ctx, _NEW_TRANSFORM_FEEDBACK), since we're about to change something that would be used by existing glBegin()/glEnd() rendering that is batched up in the vbo module.
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