depth(Z) state

src/mesa/softpipe/state_tracker/st_atom_depth.c

@@ -0,0 +1,88 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
+ * 
+ **************************************************************************/
+
+ /*
+  * Authors:
+  *   Keith Whitwell <keith@tungstengraphics.com>
+  *   Brian Paul
+  */
+ 
+
+#include "st_context.h"
+#include "st_atom.h"
+#include "softpipe/sp_context.h"
+#include "softpipe/sp_defines.h"
+
+
+/**
+ * Convert GLenum depth func tokens to softpipe tokens.
+ */
+static GLuint
+gl_depth_func_to_sp(GLenum func)
+{
+   /* Same values, just biased */
+   assert(SP_DEPTH_FUNC_NEVER == GL_NEVER - GL_NEVER);
+   assert(SP_DEPTH_FUNC_LESS == GL_LESS - GL_NEVER);
+   assert(SP_DEPTH_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
+   assert(SP_DEPTH_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
+   assert(SP_DEPTH_FUNC_GREATER == GL_GREATER - GL_NEVER);
+   assert(SP_DEPTH_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
+   assert(SP_DEPTH_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
+   assert(SP_DEPTH_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
+   assert(func >= GL_NEVER);
+   assert(func <= GL_ALWAYS);
+   return func - GL_NEVER;
+}
+
+
+static void 
+update_depth( struct st_context *st )
+{
+   struct softpipe_depth_state depth;
+
+   memset(&depth, 0, sizeof(depth));
+
+   depth.enabled = st->ctx->Depth.Test;
+   depth.writemask = st->ctx->Depth.Mask;
+   depth.func = gl_depth_func_to_sp(st->ctx->Depth.Func);
+   depth.clear = st->ctx->Depth.Clear;
+
+   if (memcmp(&depth, &st->state.depth, sizeof(depth)) != 0) {
+      /* state has changed */
+      st->state.depth = depth;  /* struct copy */
+      st->softpipe->set_depth_state(st->softpipe, &depth); /* set new state */
+   }
+}
+
+
+const struct st_tracked_state st_update_depth = {
+   .dirty = {
+      .mesa = (_NEW_DEPTH),
+      .st  = 0,
+   },
+   .update = update_depth
+};