Polymer: add preliminary support for sector masks.

When walking the sectors in displayrooms, detect floor/sector masks to
place them in a mask queue. The queues are allocated on the heap, but
a stack pointer is maintained by the displayrooms to allow it to play
nice with mirror recursion.

Right now the masks are drawn after all of drawmasks is finished; that
means you can see sprites and wall masks through sector masks, but not
the opposite. There is a slight attempt at blending far to near, but
nothing too conclusive yet; that means that in some cases some sector
masks won't be visible through other sector masks, but it should work
for trivial cases.

The next step would be to copy all the drawmasks logic into Polymer
and have it (attempt to) properly interleave sector masks where they
belong in the blending order.

git-svn-id: https://svn.eduke32.com/eduke32@1980 1a8010ca-5511-0410-912e-c29ae57300e0

polymer/eduke32/build/include/polymer.h

@@ -323,7 +323,7 @@ void PR_CALLBACK    polymer_tesserror(GLenum error);
 void PR_CALLBACK    polymer_tessedgeflag(GLenum error);
 void PR_CALLBACK    polymer_tessvertex(void* vertex, void* sector);
 static int32_t      polymer_buildfloor(int16_t sectnum);
-static void         polymer_drawsector(int16_t sectnum);
+static void         polymer_drawsector(int16_t sectnum, int32_t domasks);
 // WALLS
 static int32_t      polymer_initwall(int16_t wallnum);
 static void         polymer_updatewall(int16_t wallnum);

polymer/eduke32/build/src/engine.c

@@ -8133,14 +8133,6 @@ void drawmasks(void)
     _equation maskeq, p1eq, p2eq;
     _point2d dot, dot2, middle, pos, spr;
 
-#ifdef POLYMER
-    if ((rendmode == 4) && 0)
-    {
-        polymer_drawmasks();
-        return;
-    }
-#endif
-
     for (i=spritesortcnt-1; i>=0; i--) tspriteptr[i] = &tsprite[i];
     for (i=spritesortcnt-1; i>=0; i--)
     {
@@ -8314,6 +8306,12 @@ killsprite:
 #endif
     }
 
+#ifdef POLYMER
+    if (rendmode == 4) {
+        polymer_drawmasks();
+    }
+#endif
+
     indrawroomsandmasks = 0;
     enddrawing();   //}}}
 }

polymer/eduke32/build/src/polymer.c

@@ -610,6 +610,9 @@ static int16_t  querydelay[MAXSECTORS];
 static GLuint   queryid[MAXWALLS];
 static int16_t  drawingstate[MAXSECTORS];
 
+int16_t         *cursectormasks;
+int16_t         *cursectormaskcount;
+
 float           horizang;
 int16_t         viewangle;
 
@@ -1020,7 +1023,7 @@ void                polymer_drawrooms(int32_t daposx, int32_t daposy, int32_t da
         while (i >= 0)
         {
             polymer_updatesector(i);
-            polymer_drawsector(i);
+            polymer_drawsector(i, FALSE);
             polymer_scansprites(i, tsprite, &spritesortcnt);
             i--;
         }
@@ -1064,15 +1067,30 @@ void                polymer_drawmasks(void)
 {
     bglEnable(GL_ALPHA_TEST);
     bglEnable(GL_BLEND);
-    bglEnable(GL_POLYGON_OFFSET_FILL);
+//     bglEnable(GL_POLYGON_OFFSET_FILL);
 
-    while (--spritesortcnt)
-    {
-        tspriteptr[spritesortcnt] = &tsprite[spritesortcnt];
-        polymer_drawsprite(spritesortcnt);
+//     while (--spritesortcnt)
+//     {
+//         tspriteptr[spritesortcnt] = &tsprite[spritesortcnt];
+//         polymer_drawsprite(spritesortcnt);
+//     }
+
+    // We (kind of) queue sector masks near to far, so drawing them in reverse
+    // order is the sane approach here. Of course impossible cases will arise.
+    while (*cursectormaskcount) {
+        polymer_drawsector(cursectormasks[--(*cursectormaskcount)], TRUE);
     }
 
-    bglDisable(GL_POLYGON_OFFSET_FILL);
+    // This should _always_ be called after a corresponding pr_displayrooms().
+    // Both the top-level game drawrooms and the recursive internal passes
+    // should be accounted for here. If these free cause corruption, there's
+    // an accounting bug somewhere.
+    Bfree(cursectormaskcount);
+    cursectormaskcount = NULL;
+    Bfree(cursectormasks);
+    cursectormasks = NULL;
+
+//     bglDisable(GL_POLYGON_OFFSET_FILL);
     bglDisable(GL_BLEND);
     bglDisable(GL_ALPHA_TEST);
 }
@@ -1492,6 +1510,8 @@ static void         polymer_displayrooms(int16_t dacursectnum)
     int16_t         localmaskwallcnt;
     _prmirror       mirrorlist[10];
     int             mirrorcount;
+    int16_t         *localsectormasks;
+    int16_t         *localsectormaskcount;
     int32_t         gx, gy, gz, px, py, pz;
     GLdouble        plane[4];
     float           coeff;
@@ -1515,6 +1535,11 @@ static void         polymer_displayrooms(int16_t dacursectnum)
 
     mirrorcount = 0;
 
+    localsectormasks = Bmalloc(sizeof(int16_t) * numsectors);
+    localsectormaskcount = Bcalloc(sizeof(int16_t), 1);
+    cursectormasks = localsectormasks;
+    cursectormaskcount = localsectormaskcount;
+
     bglDisable(GL_DEPTH_TEST);
     bglColor4f(1.0f, 1.0f, 1.0f, 1.0f);
     polymer_drawsky(cursky, curskypal, curskyshade);
@@ -1528,7 +1553,7 @@ static void         polymer_displayrooms(int16_t dacursectnum)
         sec = &sector[sectorqueue[front]];
 
         polymer_pokesector(sectorqueue[front]);
-        polymer_drawsector(sectorqueue[front]);
+        polymer_drawsector(sectorqueue[front], FALSE);
         polymer_scansprites(sectorqueue[front], localtsprite, &localspritesortcnt);
 
         doquery = 0;
@@ -1788,6 +1813,9 @@ static void         polymer_displayrooms(int16_t dacursectnum)
         polymer_displayrooms(mirrorlist[i].sectnum);
         depth--;
 
+        cursectormasks = localsectormasks;
+        cursectormaskcount = localsectormaskcount;
+
         globalposx = gx;
         globalposy = gy;
         globalposz = gz;
@@ -2452,18 +2480,38 @@ static int32_t      polymer_buildfloor(int16_t sectnum)
     return (1);
 }
 
-static void         polymer_drawsector(int16_t sectnum)
+static void         polymer_drawsector(int16_t sectnum, int32_t domasks)
 {
     sectortype      *sec;
     _prsector*      s;
     GLubyte         oldcolor[4];
+    int32_t         draw;
+    int32_t         queuedmask;
 
     if (pr_verbosity >= 3) OSD_Printf("PR : Drawing sector %i...\n", sectnum);
 
     sec = &sector[sectnum];
     s = prsectors[sectnum];
 
-    if (!(sec->floorstat & 1025) || (searchit == 2)) {
+    queuedmask = FALSE;
+
+    // If you're thinking of 'optimizing' the following logic, you'd better
+    // provide compelling evidence that the generated code is more efficient
+    // than what GCC can come up with on its own.
+
+    draw = TRUE;
+    // Draw masks regardless; avoid all non-masks TROR links
+    if (sec->floorstat & 384) {
+        draw = domasks;
+    } else if (sec->floorstat & 1024) {
+        draw = FALSE;
+    }
+    // Parallaxed
+    if (sec->floorstat & 1) {
+        draw = FALSE;
+    }
+
+    if (draw || (searchit == 2)) {
         if (searchit == 2) {
             memcpy(oldcolor, s->floor.material.diffusemodulation, sizeof(GLubyte) * 4);
 
@@ -2481,9 +2529,26 @@ static void         polymer_drawsector(int16_t sectnum)
 
         if (searchit == 2)
             memcpy(s->floor.material.diffusemodulation, oldcolor, sizeof(GLubyte) * 4);
+    } else if (!domasks && sec->floorstat & 384) {
+        // If we just skipped a mask, queue it for later
+        cursectormasks[(*cursectormaskcount)++] = sectnum;
+        // Don't queue it twice if the ceiling is also a mask, though.
+        queuedmask = TRUE;
     }
 
-    if (!(sec->ceilingstat & 1025) || (searchit == 2)) {
+    draw = TRUE;
+    // Draw masks regardless; avoid all non-masks TROR links
+    if (sec->ceilingstat & 384) {
+        draw = domasks;
+    } else if (sec->ceilingstat & 1024) {
+        draw = FALSE;
+    }
+    // Parallaxed
+    if (sec->ceilingstat & 1) {
+        draw = FALSE;
+    }
+
+    if (draw || (searchit == 2)) {
         if (searchit == 2) {
             memcpy(oldcolor, s->ceil.material.diffusemodulation, sizeof(GLubyte) * 4);
 
@@ -2501,6 +2566,9 @@ static void         polymer_drawsector(int16_t sectnum)
 
         if (searchit == 2)
             memcpy(s->ceil.material.diffusemodulation, oldcolor, sizeof(GLubyte) * 4);
+    } else if (!domasks && !queuedmask && (sec->ceilingstat & 384)) {
+        // If we just skipped a mask, queue it for later
+        cursectormasks[(*cursectormaskcount)++] = sectnum;
     }
 
     if (pr_verbosity >= 3) OSD_Printf("PR : Finished drawing sector %i...\n", sectnum);