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-rw-r--r--src/mesa/main/mtypes.h1
-rw-r--r--src/mesa/main/stencil.c5
2 files changed, 6 insertions, 0 deletions
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index ace6938da54..e731fe3ab30 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1015,6 +1015,7 @@ struct gl_stencil_attrib
GLboolean TestTwoSide; /**< GL_EXT_stencil_two_side */
GLubyte ActiveFace; /**< GL_EXT_stencil_two_side (0 or 2) */
GLboolean _Enabled; /**< Enabled and stencil buffer present */
+ GLboolean _WriteEnabled; /**< _Enabled and non-zero writemasks */
GLboolean _TestTwoSide;
GLubyte _BackFace; /**< Current back stencil state (1 or 2) */
GLenum Function[3]; /**< Stencil function */
diff --git a/src/mesa/main/stencil.c b/src/mesa/main/stencil.c
index c161808e58a..33084173138 100644
--- a/src/mesa/main/stencil.c
+++ b/src/mesa/main/stencil.c
@@ -551,6 +551,11 @@ _mesa_update_stencil(struct gl_context *ctx)
ctx->Stencil.Ref[0] != ctx->Stencil.Ref[face] ||
ctx->Stencil.ValueMask[0] != ctx->Stencil.ValueMask[face] ||
ctx->Stencil.WriteMask[0] != ctx->Stencil.WriteMask[face]);
+
+ ctx->Stencil._WriteEnabled =
+ ctx->Stencil._Enabled &&
+ (ctx->Stencil.WriteMask[0] != 0 ||
+ (ctx->Stencil._TestTwoSide && ctx->Stencil.WriteMask[face] != 0));
}