mesa: Move ROUND_DOWN_TO() macro from i915/i965 to macros.h.

[mesa.git] / src / mesa / main / stencil.h

diff --git a/src/mesa/main/stencil.h b/src/mesa/main/stencil.h
index 252ac932acde8c8c47ec8eb380e622ad84359b0c..6480b2adcce30da14b42846fc27f7040092fff31 100644 (file)
--- a/src/mesa/main/stencil.h
+++ b/src/mesa/main/stencil.h
@@ -5,7 +5,6 @@
 
 /*
  * Mesa 3-D graphics library
- * Version:  7.1
  *
  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
  *
@@ -22,9 +21,10 @@
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
  */
 
 
@@ -32,8 +32,9 @@
 #define STENCIL_H
 
 
-#include "mtypes.h"
+#include "glheader.h"
 
+struct gl_context;
 
 extern void GLAPIENTRY
 _mesa_ClearStencil( GLint s );
@@ -71,10 +72,24 @@ _mesa_StencilMaskSeparate(GLenum face, GLuint mask);
 
 
 extern void
-_mesa_update_stencil(GLcontext *ctx);
+_mesa_update_stencil(struct gl_context *ctx);
 
 
 extern void 
-_mesa_init_stencil( GLcontext * ctx );
+_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