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mesa: Track changes to transform feedback state. 

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.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Paul Berry 2011-11-22 11:53:46 -08:00
parent 63a6fd6603
commit a98ceee0ee
2 changed files with 9 additions and 1 deletions
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1
src/mesa/main/mtypes.h
View File

@ -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
/*@}*/

9
src/mesa/main/transformfeedback.c
View File

@ -376,6 +376,7 @@ _mesa_BeginTransformFeedback(GLenum mode)
return;
}
FLUSH_VERTICES(ctx, _NEW_TRANSFORM_FEEDBACK);
obj->Active = GL_TRUE;
ctx->TransformFeedback.Mode = mode;
@ -398,6 +399,7 @@ _mesa_EndTransformFeedback(void)
return;
}
FLUSH_VERTICES(ctx, _NEW_TRANSFORM_FEEDBACK);
ctx->TransformFeedback.CurrentObject->Active = GL_FALSE;
assert(ctx->Driver.EndTransformFeedback);
@ -415,6 +417,7 @@ bind_buffer_range(struct gl_context *ctx, GLuint index,
{
struct gl_transform_feedback_object *obj =
ctx->TransformFeedback.CurrentObject;
FLUSH_VERTICES(ctx, _NEW_TRANSFORM_FEEDBACK);
/* The general binding point */
_mesa_reference_buffer_object(ctx,
@ -650,7 +653,9 @@ _mesa_TransformFeedbackVaryings(GLuint program, GLsizei count,
shProg->TransformFeedback.BufferMode = bufferMode;
/* The varyings won't be used until shader link time */
/* No need to set _NEW_TRANSFORM_FEEDBACK (or invoke FLUSH_VERTICES) since
* the varyings won't be used until shader link time.
*/
}
@ -874,6 +879,7 @@ _mesa_PauseTransformFeedback(void)
return;
}
FLUSH_VERTICES(ctx, _NEW_TRANSFORM_FEEDBACK);
obj->Paused = GL_TRUE;
assert(ctx->Driver.PauseTransformFeedback);
@ -899,6 +905,7 @@ _mesa_ResumeTransformFeedback(void)
return;
}
FLUSH_VERTICES(ctx, _NEW_TRANSFORM_FEEDBACK);
obj->Paused = GL_FALSE;
assert(ctx->Driver.ResumeTransformFeedback);