xwininfo fontconfig libX11 libXdmcp libfontenc libxcb libxcb/xcb-proto mesalib xserver xkeyboard-config mkfontscale git update 22 Feb 2015

xserver          commit 3a06faf3fcdb7451125a46181f9152e8e59e9770
libxcb           commit e3ec1f74637237ce500dfd0ca59f2e422da4e019
libxcb/xcb-proto commit 4c550465934164aab2449a125f75f4ca07816233
xkeyboard-config commit 26f344c93f8c6141e9233eb68088ba4fd56bc9ef
libX11           commit c8e19b393defd53f046ddc2da3a16881221b3c34
libXdmcp         commit 9f4cac7656b221ce2a8f97e7bd31e5e23126d001
libfontenc       commit de1843aaf76015c9d99416f3122d169fe331b849
mkfontscale      commit 87d628f8eec170ec13bb9feefb1ce05aed07d1d6
xwininfo         commit 0c49f8f2bd56b1e77721e81030ea948386dcdf4e
fontconfig       commit d6d5adeb7940c0d0beb86489c2a1c2ce59e5c044
mesa             commit 4359954d842caa2a9f8d4b50d70ecc789884b68b

1 files changed, 18 insertions, 6 deletions

diff --git a/mesalib/src/mesa/main/stencil.c b/mesalib/src/mesa/main/stencil.c
index f65116abe..2a19a17b8 100644
--- a/mesalib/src/mesa/main/stencil.c
+++ b/mesalib/src/mesa/main/stencil.c
@@ -573,12 +573,24 @@ _mesa_init_stencil(struct gl_context *ctx)
    ctx->Stencil.Ref[0] = 0;
    ctx->Stencil.Ref[1] = 0;
    ctx->Stencil.Ref[2] = 0;
-   ctx->Stencil.ValueMask[0] = ~0U;
-   ctx->Stencil.ValueMask[1] = ~0U;
-   ctx->Stencil.ValueMask[2] = ~0U;
-   ctx->Stencil.WriteMask[0] = ~0U;
-   ctx->Stencil.WriteMask[1] = ~0U;
-   ctx->Stencil.WriteMask[2] = ~0U;
+
+   /* 4.1.4 Stencil Test section of the GL-ES 3.0 specification says:
+    *
+    *     "In the initial state, [...] the front and back stencil mask are both
+    *     set to the value 2^s − 1, where s is greater than or equal to the
+    *     number of bits in the deepest stencil buffer* supported by the GL
+    *     implementation."
+    *
+    * Since the maximum supported precision for stencil buffers is 8 bits,
+    * mask values should be initialized to 2^8 - 1 = 0xFF.
+    */
+   ctx->Stencil.ValueMask[0] = 0xFF;
+   ctx->Stencil.ValueMask[1] = 0xFF;
+   ctx->Stencil.ValueMask[2] = 0xFF;
+   ctx->Stencil.WriteMask[0] = 0xFF;
+   ctx->Stencil.WriteMask[1] = 0xFF;
+   ctx->Stencil.WriteMask[2] = 0xFF;
+
    ctx->Stencil.Clear = 0;
    ctx->Stencil._BackFace = 1;
 }