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mesa: add accessor for effective stencil ref

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Clamps the stencil reference value to the range representable in the
currently-bound draw framebuffer's stencil attachment.

V2: Add spec quote.

NOTE: This is a candidate for stable branches.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
(cherry picked from commit 38f65162af)
This commit is contained in:
Chris Forbes 2013-05-13 21:17:29 +12:00 • committed by Kenneth Graunke
parent e75c4d05fc
commit bfb8015386
1 changed files with 14 additions and 0 deletions
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14
src/mesa/main/stencil.h
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@ -78,4 +78,18 @@ _mesa_update_stencil(struct gl_context *ctx);
extern void
_mesa_init_stencil( struct gl_context * ctx );
/* From the GL 4.3 spec, 17.3.5:
* "Stencil comparison operations and queries of <ref> clamp its value
* to the range [0, 2^s-1], where <s> is the number of bits in the
* stencil buffer attached to the draw framebuffer."
*/
static inline GLint
_mesa_get_stencil_ref(struct gl_context const *ctx, int face)
{
GLint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
GLint ref = ctx->Stencil.Ref[face];
return CLAMP(ref, 0, stencilMax);
}
#endif