pull clip/ module wide and stippled lines/points code

1 files changed, 275 insertions, 0 deletions

diff --git a/src/mesa/pipe/draw/draw_wide_prims.c b/src/mesa/pipe/draw/draw_wide_prims.c
new file mode 100644
index 0000000..20151f1
--- /dev/null
+++ b/src/mesa/pipe/draw/draw_wide_prims.c
@@ -0,0 +1,275 @@
+/**************************************************************************
+ * 
+ * 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 "pipe/p_util.h"
+#include "pipe/p_defines.h"
+#include "draw_private.h"
+
+
+
+struct wide_stage {
+   struct draw_stage stage;
+
+   unsigned hw_data_offset;
+
+   float half_line_width;
+   float half_point_size;
+};
+
+
+
+static INLINE struct wide_stage *wide_stage( struct draw_stage *stage )
+{
+   return (struct wide_stage *)stage;
+}
+
+
+
+
+
+static void tri( struct draw_stage *next,
+		 struct vertex_header *v0,
+		 struct vertex_header *v1,
+		 struct vertex_header *v2 )
+{
+   struct prim_header tmp;
+
+   tmp.det = 1.0;
+   tmp.v[0] = v0;
+   tmp.v[1] = v1;
+   tmp.v[2] = v2;
+   next->tri( next, &tmp );
+}
+
+static void quad( struct draw_stage *next,
+		  struct vertex_header *v0,
+		  struct vertex_header *v1,
+		  struct vertex_header *v2,
+		  struct vertex_header *v3 )
+{
+   /* XXX: Need to disable tri-stipple
+    */
+   tri( next, v0, v1, v3 );
+   tri( next, v2, v0, v3 );
+}
+
+static void wide_line( struct draw_stage *stage,
+		       struct prim_header *header )
+{
+   struct wide_stage *wide = wide_stage(stage);
+   unsigned hw_data_offset = wide->hw_data_offset;
+   float half_width = wide->half_line_width;
+
+   struct vertex_header *v0 = dup_vert(stage, header->v[0], 0);
+   struct vertex_header *v1 = dup_vert(stage, header->v[0], 1);
+   struct vertex_header *v2 = dup_vert(stage, header->v[1], 2);
+   struct vertex_header *v3 = dup_vert(stage, header->v[1], 3);
+
+   float *pos0 = (float *)&(v0->data[hw_data_offset]);
+   float *pos1 = (float *)&(v1->data[hw_data_offset]);
+   float *pos2 = (float *)&(v2->data[hw_data_offset]);
+   float *pos3 = (float *)&(v3->data[hw_data_offset]);
+   
+   float dx = FABSF(pos0[0] - pos2[0]);
+   float dy = FABSF(pos0[1] - pos2[1]);
+   
+   if (dx > dy) {
+      pos0[1] -= half_width;
+      pos1[1] += half_width;
+      pos2[1] -= half_width;
+      pos3[1] += half_width;
+   }
+   else {
+      pos0[0] -= half_width;
+      pos1[0] += half_width;
+      pos2[0] -= half_width;
+      pos3[0] += half_width;
+   }
+
+   quad( stage->next, v0, v1, v2, v3 );
+}
+
+
+static void make_wide_point( struct draw_stage *stage,
+			     const struct vertex_header *vin,
+			     struct vertex_header *v[] )
+{
+   struct wide_stage *wide = wide_stage(stage);
+   unsigned hw_data_offset = wide->hw_data_offset;
+   float half_size = wide->half_point_size;
+   float *pos[4];
+
+   v[0] = dup_vert(stage, vin, 0);
+   pos[0] = (float *)&(v[0]->data[hw_data_offset]);
+
+   /* Probably not correct:
+    */
+   pos[0][0] = pos[0][0];
+   pos[0][1] = pos[0][1] - .5;
+
+   v[1] = dup_vert(stage, v[0], 1);
+   v[2] = dup_vert(stage, v[0], 2);
+   v[3] = dup_vert(stage, v[0], 3);
+
+   pos[1] = (float *)&(v[1]->data[hw_data_offset]);
+   pos[2] = (float *)&(v[2]->data[hw_data_offset]);
+   pos[3] = (float *)&(v[3]->data[hw_data_offset]);
+   
+   _mesa_printf("point %f %f, %f\n", pos[0][0], pos[0][1], half_size);
+
+   pos[0][0] -= half_size;
+   pos[0][1] -= half_size;
+
+   pos[1][0] -= half_size;
+   pos[1][1] += half_size;
+
+   pos[2][0] += half_size;
+   pos[2][1] -= half_size;
+
+   pos[3][0] += half_size;
+   pos[3][1] += half_size;
+   
+//   quad( stage->next, v[0], v[1], v[2], v[3] );
+}
+
+static void wide_point( struct draw_stage *stage,
+			struct prim_header *header )
+{
+   struct vertex_header *v[4];
+   make_wide_point(stage, header->v[0], v );
+   quad( stage->next, v[0], v[1], v[2], v[3] );
+}
+
+
+static void set_texcoord( struct vertex_fetch *vf,			   
+			  struct vertex_header *v,
+			  const float *val )
+{ 
+   GLubyte *dst = (GLubyte *)v;
+   const struct vf_attr *a = vf->attr;
+   const unsigned attr_count = vf->attr_count;
+   unsigned j;
+
+   /* XXX: precompute which attributes need to be set.
+    */
+   for (j = 1; j < attr_count; j++) {
+      if (a[j].attrib >= VF_ATTRIB_TEX0 &&
+	  a[j].attrib <= VF_ATTRIB_TEX7)
+	 a[j].insert[4-1]( &a[j], dst + a[j].vertoffset, val );
+   }
+}
+
+
+
+/* If there are lots of sprite points (and why wouldn't there be?) it
+ * would probably be more sensible to change hardware setup to
+ * optimize this rather than doing the whole thing in software like
+ * this.
+ */
+static void sprite_point( struct draw_stage *stage,
+		       struct prim_header *header )
+{
+   struct vertex_header *v[4];
+   struct vertex_fetch *vf = stage->pipe->draw->vb.vf;
+
+   static const float tex00[4] = { 0, 0, 0, 1 };
+   static const float tex01[4] = { 0, 1, 0, 1 };
+   static const float tex11[4] = { 1, 1, 0, 1 };
+   static const float tex10[4] = { 1, 0, 0, 1 };
+
+   make_wide_point(stage, header->v[0], &v[0] );
+   
+   set_texcoord( vf, v[0], tex00 );
+   set_texcoord( vf, v[1], tex01 );
+   set_texcoord( vf, v[2], tex10 );
+   set_texcoord( vf, v[3], tex11 );
+
+   quad( stage->next, v[0], v[1], v[2], v[3] );
+}
+
+
+
+static void wide_begin( struct draw_stage *stage )
+{
+   struct wide_stage *wide = wide_stage(stage);
+   struct clip_context *draw = stage->pipe->draw;
+
+   if (draw->vb_state.clipped_prims)
+      wide->hw_data_offset = 16;
+   else
+      wide->hw_data_offset = 0;	
+
+   wide->half_point_size = draw->state.point_size / 2;
+   wide->half_line_width = draw->state.line_width / 2;
+
+   if (draw->state.line_width != 1.0) {
+      wide->stage.line = wide_line;
+   }
+   else {
+      wide->stage.line = clip_passthrough_line;
+   }
+
+   if (draw->state.point_sprite) {
+      wide->stage.point = sprite_point;
+   }
+   else if (draw->state.point_size != 1.0) {
+      wide->stage.point = wide_point;
+   }
+   else {
+      wide->stage.point = clip_passthrough_point;
+   }
+
+   
+   stage->next->begin( stage->next );
+}
+
+
+
+static void wide_end( struct draw_stage *stage )
+{
+   stage->next->end( stage->next );
+}
+
+struct draw_stage *clip_pipe_wide( struct clip_pipeline *pipe )
+{
+   struct wide_stage *wide = CALLOC_STRUCT(wide_stage);
+
+   clip_pipe_alloc_tmps( &wide->stage, 4 );
+
+   wide->stage.pipe = pipe;
+   wide->stage.next = NULL;
+   wide->stage.begin = wide_begin;
+   wide->stage.point = wide_point;
+   wide->stage.line = wide_line;
+   wide->stage.tri = clip_passthrough_tri;
+   wide->stage.reset_tmps = clip_pipe_reset_tmps;
+   wide->stage.end = wide_end;
+
+   return &wide->stage;
+}