New 'draw' module for handling the various stages of primitive drawing (clipping, culling, etc).

1 files changed, 182 insertions, 0 deletions

diff --git a/src/mesa/pipe/draw/draw_context.c b/src/mesa/pipe/draw/draw_context.c
new file mode 100644
index 0000000000..c91be23eef
--- /dev/null
+++ b/src/mesa/pipe/draw/draw_context.c
@@ -0,0 +1,182 @@
+/**************************************************************************
+ * 
+ * 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>
+  */
+
+#include "imports.h"
+#include "macros.h"
+
+#include "draw_context.h"
+#include "draw_private.h"
+
+
+struct draw_context *draw_create( void )
+{
+   struct draw_context *draw = CALLOC_STRUCT( draw_context );
+
+   /* create pipeline stages */
+   draw->pipeline.unfilled  = prim_unfilled( draw );
+   draw->pipeline.twoside   = prim_twoside( draw );
+   draw->pipeline.offset    = prim_offset( draw );
+   draw->pipeline.clip      = prim_clip( draw );
+   draw->pipeline.flatshade = prim_flatshade( draw );
+   draw->pipeline.cull      = prim_cull( draw );
+
+   ASSIGN_4V( draw->plane[0], -1,  0,  0, 1 );
+   ASSIGN_4V( draw->plane[1],  1,  0,  0, 1 );
+   ASSIGN_4V( draw->plane[2],  0, -1,  0, 1 );
+   ASSIGN_4V( draw->plane[3],  0,  1,  0, 1 );
+   ASSIGN_4V( draw->plane[4],  0,  0,  1, 1 ); /* yes these are correct */
+   ASSIGN_4V( draw->plane[5],  0,  0, -1, 1 ); /* mesa's a bit wonky */
+   draw->nr_planes = 6;
+
+   draw->vf = vf_create( GL_TRUE );
+
+   return draw;
+}
+
+
+void draw_destroy( struct draw_context *draw )
+{
+   if (draw->header.storage)
+      ALIGN_FREE( draw->header.storage );
+
+   vf_destroy( draw->vf );
+
+   FREE( draw );
+}
+
+
+/**
+ * Rebuild the rendering pipeline.
+ */
+static void validate_pipeline( struct draw_context *draw )
+{
+   struct prim_stage *next = draw->pipeline.setup;
+
+   /* TODO: make the current primitive part of the state and build
+    * shorter pipelines for lines & points.
+    */
+   if (draw->setup.fill_cw != PIPE_POLYGON_MODE_FILL ||
+       draw->setup.fill_ccw != PIPE_POLYGON_MODE_FILL) {
+
+      draw->pipeline.unfilled->next = next;
+      next = draw->pipeline.unfilled;
+   }
+	 
+   if (draw->setup.offset_cw ||
+       draw->setup.offset_ccw) {
+      draw->pipeline.offset->next = next;
+      next = draw->pipeline.offset;
+   }
+
+   if (draw->setup.light_twoside) {
+      draw->pipeline.twoside->next = next;
+      next = draw->pipeline.twoside;
+   }
+
+   /* Always run the cull stage as we calculate determinant there
+    * also.  Fix this..
+    */
+   {
+      draw->pipeline.cull->next = next;
+      next = draw->pipeline.cull;
+   }
+
+
+   /* Clip stage
+    */
+   {
+      draw->pipeline.clip->next = next;
+      next = draw->pipeline.clip;
+   }
+
+   /* Do software flatshading prior to clipping.  XXX: should only do
+    * this for clipped primitives, ie it is a part of the clip
+    * routine.
+    */
+   if (draw->setup.flatshade) {
+      draw->pipeline.flatshade->next = next;
+      next = draw->pipeline.flatshade;
+   }
+   
+
+   draw->pipeline.first = next;
+}
+
+
+/**
+ * Register new primitive setup/rendering state.
+ * This causes the drawing pipeline to be rebuilt.
+ */
+void draw_set_setup_state( struct draw_context *draw,
+                           const struct pipe_setup_state *setup )
+{
+   memcpy( &draw->setup, setup, sizeof(*setup) );
+   validate_pipeline( draw );
+}
+
+
+/** 
+ * Plug in the primitive rendering/rasterization stage.
+ * This is provided by the device driver.
+ */
+void draw_set_setup_stage( struct draw_context *draw,
+                           struct prim_stage *stage )
+{
+   draw->pipeline.setup = stage;
+}
+
+
+/**
+ * Set the draw module's clipping state.
+ */
+void draw_set_clip_state( struct draw_context *draw,
+                          const struct pipe_clip_state *clip )
+{
+   memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
+   draw->nr_planes = 6 + clip->nr;
+}
+
+
+/**
+ * Set the draw module's viewport state.
+ */
+void draw_set_viewport_state( struct draw_context *draw,
+                              const struct pipe_viewport_state *viewport )
+{
+   draw->viewport = *viewport; /* struct copy */
+
+   vf_set_vp_scale_translate( draw->vf, viewport->scale, viewport->translate );
+
+   /* Using tnl/ and vf/ modules is temporary while getting started.
+    * Full pipe will have vertex shader, vertex fetch of its own.
+    */
+}