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-rw-r--r--src/gallium/auxiliary/draw/draw_pipe_cull.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/draw/draw_pipe_cull.c b/src/gallium/auxiliary/draw/draw_pipe_cull.c
new file mode 100644
index 0000000000..0a70483858
--- /dev/null
+++ b/src/gallium/auxiliary/draw/draw_pipe_cull.c
@@ -0,0 +1,148 @@
+/**************************************************************************
+ *
+ * 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 "util/u_memory.h"
+#include "pipe/p_defines.h"
+#include "draw_pipe.h"
+
+
+struct cull_stage {
+ struct draw_stage stage;
+ unsigned winding; /**< which winding(s) to cull (one of PIPE_WINDING_x) */
+};
+
+
+static INLINE struct cull_stage *cull_stage( struct draw_stage *stage )
+{
+ return (struct cull_stage *)stage;
+}
+
+
+
+
+static void cull_tri( struct draw_stage *stage,
+ struct prim_header *header )
+{
+ const unsigned pos = stage->draw->vs.position_output;
+
+ /* Window coords: */
+ const float *v0 = header->v[0]->data[pos];
+ const float *v1 = header->v[1]->data[pos];
+ const float *v2 = header->v[2]->data[pos];
+
+ /* edge vectors e = v0 - v2, f = v1 - v2 */
+ const float ex = v0[0] - v2[0];
+ const float ey = v0[1] - v2[1];
+ const float fx = v1[0] - v2[0];
+ const float fy = v1[1] - v2[1];
+
+ /* det = cross(e,f).z */
+ header->det = ex * fy - ey * fx;
+
+ if (header->det != 0) {
+ /* if (det < 0 then Z points toward camera and triangle is
+ * counter-clockwise winding.
+ */
+ unsigned winding = (header->det < 0) ? PIPE_WINDING_CCW : PIPE_WINDING_CW;
+
+ if ((winding & cull_stage(stage)->winding) == 0) {
+ /* triangle is not culled, pass to next stage */
+ stage->next->tri( stage->next, header );
+ }
+ }
+}
+
+static void cull_first_tri( struct draw_stage *stage,
+ struct prim_header *header )
+{
+ struct cull_stage *cull = cull_stage(stage);
+
+ cull->winding = stage->draw->rasterizer->cull_mode;
+
+ stage->tri = cull_tri;
+ stage->tri( stage, header );
+}
+
+
+
+static void cull_flush( struct draw_stage *stage, unsigned flags )
+{
+ stage->tri = cull_first_tri;
+ stage->next->flush( stage->next, flags );
+}
+
+static void cull_reset_stipple_counter( struct draw_stage *stage )
+{
+ stage->next->reset_stipple_counter( stage->next );
+}
+
+
+static void cull_destroy( struct draw_stage *stage )
+{
+ draw_free_temp_verts( stage );
+ FREE( stage );
+}
+
+
+/**
+ * Create a new polygon culling stage.
+ */
+struct draw_stage *draw_cull_stage( struct draw_context *draw )
+{
+ struct cull_stage *cull = CALLOC_STRUCT(cull_stage);
+ if (cull == NULL)
+ goto fail;
+
+ if (!draw_alloc_temp_verts( &cull->stage, 0 ))
+ goto fail;
+
+ cull->stage.draw = draw;
+ cull->stage.name = "cull";
+ cull->stage.next = NULL;
+ cull->stage.point = draw_pipe_passthrough_point;
+ cull->stage.line = draw_pipe_passthrough_line;
+ cull->stage.tri = cull_first_tri;
+ cull->stage.flush = cull_flush;
+ cull->stage.reset_stipple_counter = cull_reset_stipple_counter;
+ cull->stage.destroy = cull_destroy;
+
+ return &cull->stage;
+
+ fail:
+ if (cull)
+ cull->stage.destroy( &cull->stage );
+
+ return NULL;
+}