Completely revised the implementation of fakeradio shadow edges. The …

…old scheme did not take advantage of the spacial information provided by the vertex lineowner rings particularly well.

Todo: No method for resolving overlaps has been implemented as yet. Only the vertex inner offset is actually used. Needs a new scheme to replace the old back-extended offsets.

doomsday/engine/portable/include/mapdata.hs

@@ -9,16 +9,9 @@ internal
 #define LO_prev     link[0]
 #define LO_next     link[1]
 
-typedef struct shadowpolyoffset_s {
-    float           offset[2];
-} shadowpolyoffset_t;
-
-#define MAX_BEXOFFSETS  8
-
-typedef struct shadowvert_s {
-    float           inner[2];
-    float           extended[2];
-    shadowpolyoffset_t backExtended[MAX_BEXOFFSETS];
+typedef struct shadowvert_s {
+    float           inner[2];
+    float           extended[2];
 } shadowvert_t;
 
 typedef struct lineowner_s {
@@ -80,7 +73,6 @@ internal
 
 // Seg flags
 #define SEGF_POLYOBJ            0x1 // Seg is part of a poly object.
-#define SEGF_SHADOW				0x2 // Seg casts edge shadows.
 
 // Seg frame flags
 #define SEGINF_FACINGFRONT      0x0001
@@ -107,7 +99,6 @@ struct seg
     -       biastracker_s[3] tracker // 0=middle, 1=top, 2=bottom
     -       vertexillum_s[3][4] illum
     -       short       frameFlags
-    -       ushort      shadowVisFrame
 end
 
 internal
@@ -458,6 +449,7 @@ struct linedef
     FLOAT   float[4]    bBox
     -       boolean[DDMAXPLAYERS] mapped // Whether the line has been mapped by each player yet.
     -       mlinedef_t  buildData
+    -       ushort[2]   shadowVisFrame // Framecount of last time shadows were drawn for this line, for each side [right, left].
 end
 
 internal

doomsday/engine/portable/include/p_maptypes.h

@@ -8,16 +8,9 @@
 #define LO_prev     link[0]
 #define LO_next     link[1]
 
-typedef struct shadowpolyoffset_s {
-    float           offset[2];
-} shadowpolyoffset_t;
-
-#define MAX_BEXOFFSETS  8
-
 typedef struct shadowvert_s {
     float           inner[2];
     float           extended[2];
-    shadowpolyoffset_t backExtended[MAX_BEXOFFSETS];
 } shadowvert_t;
 
 typedef struct lineowner_s {
@@ -78,7 +71,6 @@ typedef struct vertex_s {
 
 // Seg flags
 #define SEGF_POLYOBJ            0x1 // Seg is part of a poly object.
-#define SEGF_SHADOW				0x2 // Seg casts edge shadows.
 
 // Seg frame flags
 #define SEGINF_FACINGFRONT      0x0001
@@ -101,7 +93,6 @@ typedef struct seg_s {
     struct biastracker_s tracker[3];   // 0=middle, 1=top, 2=bottom
     struct vertexillum_s illum[3][4];
     short               frameFlags;
-    unsigned short      shadowVisFrame;
 } seg_t;
 
 #define SUBF_MIDPOINT         0x80    // Midpoint is tri-fan centre.
@@ -428,6 +419,7 @@ typedef struct linedef_s {
     float               bBox[4];
     boolean             mapped[DDMAXPLAYERS]; // Whether the line has been mapped by each player yet.
     mlinedef_t          buildData;
+    unsigned short      shadowVisFrame[2]; // Framecount of last time shadows were drawn for this line, for each side [right, left].
 } linedef_t;
 
 typedef struct mpolyobj_s {

doomsday/engine/portable/include/r_data.h

@@ -175,7 +175,8 @@ typedef struct linkmobj_s {
 
 typedef struct shadowlink_s {
     struct shadowlink_s *next;
-    seg_t          *seg;
+    linedef_t      *lineDef;
+    byte            side;
 } shadowlink_t;
 
 typedef struct subplaneinfo_s {

doomsday/engine/portable/include/r_shadow.h

@@ -22,15 +22,15 @@
  * Boston, MA  02110-1301  USA
  */
 
-/*
+/**
  * r_shadow.h: Runtime Map Shadowing (FakeRadio)
  */
 
 #ifndef __DOOMSDAY_REFRESH_SHADOW_H__
 #define __DOOMSDAY_REFRESH_SHADOW_H__
 
 void            R_InitSectorShadows(void);
-sector_t       *R_GetShadowSector(seg_t *seg, uint plane,
-                                  boolean getLinked);
+
+boolean         R_IsShadowingLinedef(linedef_t *line);
 
 #endif