1 files changed, 130 insertions, 0 deletions
diff --git a/src/mesa/pipe/draw/draw_cull.c b/src/mesa/pipe/draw/draw_cull.c
new file mode 100644
index 0000000000..863686f150
--- /dev/null
+++ b/src/mesa/pipe/draw/draw_cull.c
@@ -0,0 +1,130 @@
+/**************************************************************************
+ * 
+ * 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.
+ * 
+ **************************************************************************/
+
+/**
+ * \brief  Drawing stage for polygon culling
+ */
+
+/* Authors:  Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+
+#include "main/imports.h"
+#include "pipe/p_defines.h"
+#include "draw_private.h"
+
+
+struct cull_stage {
+   struct draw_stage stage;
+   GLuint mode;  /**< one of PIPE_WINDING_x */
+};
+
+
+static INLINE struct cull_stage *cull_stage( struct draw_stage *stage )
+{
+   return (struct cull_stage *)stage;
+}
+
+
+static void cull_begin( struct draw_stage *stage )
+{
+   struct cull_stage *cull = cull_stage(stage);
+
+   cull->mode = stage->draw->setup.cull_mode;
+
+   stage->next->begin( stage->next );
+}
+
+
+static void cull_tri( struct draw_stage *stage,
+		      struct prim_header *header )
+{
+   /* Window coords: */
+   const GLfloat *v0 = header->v[0]->data[0];
+   const GLfloat *v1 = header->v[1]->data[0];
+   const GLfloat *v2 = header->v[2]->data[0];
+
+   /* edge vectors e = v0 - v2, f = v1 - v2 */
+   GLfloat ex = v0[0] - v2[0];
+   GLfloat ey = v0[1] - v2[1];
+   GLfloat fx = v1[0] - v2[0];
+   GLfloat fy = v1[1] - v2[1];
+   
+   /* det = cross(e,f).z */
+   header->det = ex * fy - ey * fx;
+
+   if (header->det != 0) {
+      /* non-zero area */
+      GLuint mode = (header->det > 0) ? PIPE_WINDING_CW : PIPE_WINDING_CCW;
+
+      if ((mode & cull_stage(stage)->mode) == 0) {
+         /* triangle is not culled, pass to next stage */
+	 stage->next->tri( stage->next, header );
+      }
+   }
+}
+
+
+static void cull_line( struct draw_stage *stage,
+		       struct prim_header *header )
+{
+   stage->next->line( stage->next, header );
+}
+
+
+static void cull_point( struct draw_stage *stage,
+			struct prim_header *header )
+{
+   stage->next->point( stage->next, header );
+}
+
+
+static void cull_end( struct draw_stage *stage )
+{
+   stage->next->end( stage->next );
+}
+
+
+/**
+ * Create a new polygon culling stage.
+ */
+struct draw_stage *draw_cull_stage( struct draw_context *draw )
+{
+   struct cull_stage *cull = CALLOC_STRUCT(cull_stage);
+
+   draw_alloc_tmps( &cull->stage, 0 );
+
+   cull->stage.draw = draw;
+   cull->stage.next = NULL;
+   cull->stage.begin = cull_begin;
+   cull->stage.point = cull_point;
+   cull->stage.line = cull_line;
+   cull->stage.tri = cull_tri;
+   cull->stage.end = cull_end;
+
+   return &cull->stage;
+}