From d1a2eb6d187cd57ecb31f1c0f8ecb3428d116e41 Mon Sep 17 00:00:00 2001
From: EvilSpirit <anandamide@mail.ru>
Date: Wed, 9 Mar 2016 10:53:46 +0600
Subject: [PATCH] Allow rendering hidden solid edges using a distinct style.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Before this change, the two buttons "Show/hide shaded model" (S) and
"Show/hide hidden lines" (H) resulted in drawing the following
elements in the following styles:

  Button | Non-occluded | Non-occluded |  Occluded   |   Occluded
  state  | solid edges  |   entities   | solid edges |   entities
 --------+--------------+--------------+-------------+--------------
  !S !H  |              |              | solid-edge  | entity style
 --------+              |              +-------------+--------------
   S !H  |              |              |         invisible
 --------+  solid-edge  | entity style +-------------+--------------
  !S  H  |              |              |             |
 --------+              |              | solid-edge  | entity style
   S  H  |              |              |             |
 --------+--------------+--------------+-------------+--------------

After this change, they are drawn as follows:

  Button | Non-occluded | Non-occluded |  Occluded   |   Occluded
  state  | solid edges  |   entities   | solid edges |   entities
 --------+--------------+--------------+-------------+--------------
  !S !H  |              |              | solid-edge  | entity style
 --------+              |              +-------------+--------------
   S !H  |              |              |         invisible
 --------+  solid-edge  | entity style +-------------+--------------
  !S  H  |              |              |             |
 --------+              |              | hidden-edge |  stippled¹
   S  H  |              |              |             |
 --------+--------------+--------------+-------------+--------------

  ¹ entity style, but the stipple parameters taken from hidden-edge

In SolveSpace's true WYSIWYG tradition, the 2d view export follows
the rendered view exactly.

Also, it is now possible to edit the stipple parameters of built-in
styles, so that by changing the hidden-edge style to non-stippled
it is possible to regain the old behavior.
---
 src/draw.cpp               |  18 ++++++----
 src/drawentity.cpp         |  23 ++++++------
 src/export.cpp             |  25 +++++++------
 src/glhelper.cpp           |  14 +++++---
 src/groupmesh.cpp          |  18 +++++++---
 src/icons/hidden-lines.png | Bin 26946 -> 544 bytes
 src/mesh.cpp               |  15 ++++----
 src/polygon.cpp            |   2 +-
 src/polygon.h              |   4 +--
 src/sketch.h               |   5 +--
 src/solvespace.h           |   2 +-
 src/style.cpp              |  70 ++++++++++++++++++-------------------
 12 files changed, 113 insertions(+), 83 deletions(-)

diff --git a/src/draw.cpp b/src/draw.cpp
index 9652d55..268e5a4 100644
--- a/src/draw.cpp
+++ b/src/draw.cpp
@@ -34,7 +34,7 @@ void GraphicsWindow::Selection::Draw(void) {
     Vector refp = Vector::From(0, 0, 0);
     if(entity.v) {
         Entity *e = SK.GetEntity(entity);
-        e->Draw();
+        e->Draw(/*drawAsHidden=*/false);
         if(emphasized) refp = e->GetReferencePos();
     }
     if(constraint.v) {
@@ -686,9 +686,15 @@ nogrid:;
     // Draw the active group; this does stuff like the mesh and edges.
     (SK.GetGroup(activeGroup))->Draw();
 
-    // Now draw the entities
-    if(showHdnLines) glDisable(GL_DEPTH_TEST);
-    Entity::DrawAll();
+    // Now draw the entities.
+    if(SS.GW.showHdnLines) {
+        ssglDepthRangeOffset(2);
+        glDepthFunc(GL_GREATER);
+        Entity::DrawAll(/*drawAsHidden=*/true);
+        glDepthFunc(GL_LEQUAL);
+    }
+    ssglDepthRangeOffset(0);
+    Entity::DrawAll(/*drawAsHidden=*/false);
 
     // Draw filled paths in all groups, when those filled paths were requested
     // specially by assigning a style with a fill color, or when the filled
@@ -737,9 +743,7 @@ nogrid:;
     glEnd();
 
     // And the naked edges, if the user did Analyze -> Show Naked Edges.
-    ssglLineWidth(Style::Width(Style::DRAW_ERROR));
-    ssglColorRGB(Style::Color(Style::DRAW_ERROR));
-    ssglDrawEdges(&(SS.nakedEdges), true);
+    ssglDrawEdges(&(SS.nakedEdges), true, { Style::DRAW_ERROR });
 
     // Then redraw whatever the mouse is hovering over, highlighted.
     glDisable(GL_DEPTH_TEST);
diff --git a/src/drawentity.cpp b/src/drawentity.cpp
index 6aab2b9..82dce99 100644
--- a/src/drawentity.cpp
+++ b/src/drawentity.cpp
@@ -40,10 +40,9 @@ void Entity::LineDrawOrGetDistance(Vector a, Vector b, bool maybeFat, int data)
     dogd.refp = (a.Plus(b)).ScaledBy(0.5);
 }
 
-void Entity::DrawAll(void) {
-    // This handles points and line segments as a special case, because I
-    // seem to be able to get a huge speedup that way, by consolidating
-    // stuff to gl.
+void Entity::DrawAll(bool drawAsHidden) {
+    // This handles points as a special case, because I seem to be able
+    // to get a huge speedup that way, by consolidating stuff to gl.
     int i;
     if(SS.GW.showPoints) {
         double s = 3.5/SS.GW.scale;
@@ -98,19 +97,23 @@ void Entity::DrawAll(void) {
 
     for(i = 0; i < SK.entity.n; i++) {
         Entity *e = &(SK.entity.elem[i]);
-        if(e->IsPoint())
-        {
+        if(e->IsPoint()) {
             continue; // already handled
         }
-        e->Draw();
+        e->Draw(drawAsHidden);
     }
 }
 
-void Entity::Draw(void) {
+void Entity::Draw(bool drawAsHidden) {
     hStyle hs = Style::ForEntity(h);
     dogd.lineWidth = Style::Width(hs);
-    dogd.stippleType = Style::PatternType(hs);
-    dogd.stippleScale = Style::StippleScaleMm(hs);
+    if(drawAsHidden) {
+        dogd.stippleType = Style::PatternType({ Style::HIDDEN_EDGE });
+        dogd.stippleScale = Style::StippleScaleMm({ Style::HIDDEN_EDGE });
+    } else {
+        dogd.stippleType = Style::PatternType(hs);
+        dogd.stippleScale = Style::StippleScaleMm(hs);
+    }
     ssglLineWidth((float)dogd.lineWidth);
     ssglColorRGB(Style::Color(hs));
 
diff --git a/src/export.cpp b/src/export.cpp
index ea7d599..1e39627 100644
--- a/src/export.cpp
+++ b/src/export.cpp
@@ -122,7 +122,7 @@ void SolveSpaceUI::ExportViewOrWireframeTo(const std::string &filename, bool wir
     GenerateAll(GENERATE_ALL);
 
     SMesh *sm = NULL;
-    if(SS.GW.showShaded) {
+    if(SS.GW.showShaded || SS.GW.showHdnLines) {
         Group *g = SK.GetGroup(SS.GW.activeGroup);
         g->GenerateDisplayItems();
         sm = &(g->displayMesh);
@@ -136,8 +136,7 @@ void SolveSpaceUI::ExportViewOrWireframeTo(const std::string &filename, bool wir
         if(!e->IsVisible()) continue;
         if(e->construction) continue;
 
-        if(SS.exportPwlCurves || (sm && !SS.GW.showHdnLines) ||
-                                 fabs(SS.exportOffset) > LENGTH_EPS)
+        if(SS.exportPwlCurves || sm || fabs(SS.exportOffset) > LENGTH_EPS)
         {
             // We will be doing hidden line removal, which we can't do on
             // exact curves; so we need things broken down to pwls. Same
@@ -322,7 +321,7 @@ void SolveSpaceUI::ExportLinesAndMesh(SEdgeList *sel, SBezierList *sbl, SMesh *s
 
     // And now we perform hidden line removal if requested
     SEdgeList hlrd = {};
-    if(sm && !SS.GW.showHdnLines) {
+    if(sm) {
         SKdNode *root = SKdNode::From(&smp);
 
         // Generate the edges where a curved surface turns from front-facing
@@ -344,19 +343,19 @@ void SolveSpaceUI::ExportLinesAndMesh(SEdgeList *sel, SBezierList *sbl, SMesh *s
                 continue;
             }
 
-            SEdgeList out = {};
+            SEdgeList edges = {};
             // Split the original edge against the mesh
-            out.AddEdge(se->a, se->b, se->auxA);
-            root->OcclusionTestLine(*se, &out, cnt);
+            edges.AddEdge(se->a, se->b, se->auxA);
+            root->OcclusionTestLine(*se, &edges, cnt, /*removeHidden=*/!SS.GW.showHdnLines);
             // the occlusion test splits unnecessarily; so fix those
-            out.MergeCollinearSegments(se->a, se->b);
+            edges.MergeCollinearSegments(se->a, se->b);
             cnt++;
             // And add the results to our output
             SEdge *sen;
-            for(sen = out.l.First(); sen; sen = out.l.NextAfter(sen)) {
+            for(sen = edges.l.First(); sen; sen = edges.l.NextAfter(sen)) {
                 hlrd.AddEdge(sen->a, sen->b, sen->auxA);
             }
-            out.Clear();
+            edges.Clear();
         }
 
         sel = &hlrd;
@@ -516,6 +515,12 @@ void SolveSpaceUI::ExportLinesAndMesh(SEdgeList *sel, SBezierList *sbl, SMesh *s
         sblss.AddOpenPath(b);
     }
 
+    // We need the mesh for occlusion testing, but if we don't export it,
+    // erase it now.
+    if(!SS.GW.showShaded) {
+        sms.Clear();
+    }
+
     // Now write the lines and triangles to the output file
     out->OutputLinesAndMesh(&sblss, &sms);
 
diff --git a/src/glhelper.cpp b/src/glhelper.cpp
index d3406e1..8f706ee 100644
--- a/src/glhelper.cpp
+++ b/src/glhelper.cpp
@@ -562,15 +562,19 @@ void ssglDebugPolygon(SPolygon *p)
     }
 }
 
-void ssglDrawEdges(SEdgeList *el, bool endpointsToo)
+void ssglDrawEdges(SEdgeList *el, bool endpointsToo, hStyle hs)
 {
+    double lineWidth = Style::Width(hs);
+    int stippleType = Style::PatternType(hs);
+    double stippleScale = Style::StippleScaleMm(hs);
+    ssglLineWidth(float(lineWidth));
+    ssglColorRGB(Style::Color(hs));
+
     SEdge *se;
-    glBegin(GL_LINES);
     for(se = el->l.First(); se; se = el->l.NextAfter(se)) {
-        ssglVertex3v(se->a);
-        ssglVertex3v(se->b);
+        ssglStippledLine(se->a, se->b, lineWidth, stippleType, stippleScale,
+                         /*maybeFat=*/true);
     }
-    glEnd();
 
     if(endpointsToo) {
         glPointSize(12);
diff --git a/src/groupmesh.cpp b/src/groupmesh.cpp
index 35d9684..8889b24 100644
--- a/src/groupmesh.cpp
+++ b/src/groupmesh.cpp
@@ -476,7 +476,7 @@ void Group::DrawDisplayItems(int t) {
     if(gs.faces > 0) ms1 = gs.face[0].v;
     if(gs.faces > 1) ms2 = gs.face[1].v;
 
-    if(SS.GW.showShaded) {
+    if(SS.GW.showShaded || SS.GW.showHdnLines) {
         if(SS.drawBackFaces && !displayMesh.isTransparent) {
             // For debugging, draw the backs of the triangles in red, so that we
             // notice when a shell is open
@@ -485,16 +485,26 @@ void Group::DrawDisplayItems(int t) {
             glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 0);
         }
 
+        // Draw the shaded solid into the depth buffer for hidden line removal,
+        // and if we're actually going to display it, to the color buffer too.
         glEnable(GL_LIGHTING);
+        if(!SS.GW.showShaded) glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
         ssglFillMesh(useSpecColor, specColor, &displayMesh, mh, ms1, ms2);
+        if(!SS.GW.showShaded) glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
         glDisable(GL_LIGHTING);
     }
 
     if(SS.GW.showEdges) {
+        glDepthMask(GL_FALSE);
+        if(SS.GW.showHdnLines) {
+            ssglDepthRangeOffset(0);
+            glDepthFunc(GL_GREATER);
+            ssglDrawEdges(&displayEdges, false, { Style::HIDDEN_EDGE });
+            glDepthFunc(GL_LEQUAL);
+        }
         ssglDepthRangeOffset(2);
-        ssglColorRGB(Style::Color(Style::SOLID_EDGE));
-        ssglLineWidth(Style::Width(Style::SOLID_EDGE));
-        ssglDrawEdges(&displayEdges, false);
+        ssglDrawEdges(&displayEdges, false, { Style::SOLID_EDGE });
+        glDepthMask(GL_TRUE);
     }
 
     if(SS.GW.showMesh) ssglDebugMesh(&displayMesh);
diff --git a/src/icons/hidden-lines.png b/src/icons/hidden-lines.png
index cf43afbde50f5aa87a343ad69bcca0905557ecd8..35ea04b21340a6976600fa67b3bab7ce86f1eaa0 100644
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diff --git a/src/mesh.cpp b/src/mesh.cpp
index 51fa0d3..b7f14d1 100644
--- a/src/mesh.cpp
+++ b/src/mesh.cpp
@@ -653,7 +653,7 @@ void SKdNode::SnapToMesh(SMesh *m) {
 // them for occlusion. Keep only the visible segments. sel is both our input
 // and our output.
 //-----------------------------------------------------------------------------
-void SKdNode::SplitLinesAgainstTriangle(SEdgeList *sel, STriangle *tr) {
+void SKdNode::SplitLinesAgainstTriangle(SEdgeList *sel, STriangle *tr, bool removeHidden) {
     SEdgeList seln = {};
 
     Vector tn = tr->Normal().WithMagnitude(1);
@@ -754,8 +754,11 @@ void SKdNode::SplitLinesAgainstTriangle(SEdgeList *sel, STriangle *tr) {
                     if(n[i].Dot(pt) - d[i] > LENGTH_EPS) se->tag = 0;
                 }
             }
+            if(!removeHidden && se->tag == 1)
+                se->auxA = Style::HIDDEN_EDGE;
         }
-        sel->l.RemoveTagged();
+        if(removeHidden)
+            sel->l.RemoveTagged();
     }
 }
 
@@ -763,7 +766,7 @@ void SKdNode::SplitLinesAgainstTriangle(SEdgeList *sel, STriangle *tr) {
 // Given an edge orig, occlusion test it against our mesh. We output an edge
 // list in sel, containing the visible portions of that edge.
 //-----------------------------------------------------------------------------
-void SKdNode::OcclusionTestLine(SEdge orig, SEdgeList *sel, int cnt) {
+void SKdNode::OcclusionTestLine(SEdge orig, SEdgeList *sel, int cnt, bool removeHidden) {
     if(gt && lt) {
         double ac = (orig.a).Element(which),
                bc = (orig.b).Element(which);
@@ -773,13 +776,13 @@ void SKdNode::OcclusionTestLine(SEdge orig, SEdgeList *sel, int cnt) {
            bc < c + KDTREE_EPS ||
            which == 2)
         {
-            lt->OcclusionTestLine(orig, sel, cnt);
+            lt->OcclusionTestLine(orig, sel, cnt, removeHidden);
         }
         if(ac > c - KDTREE_EPS ||
            bc > c - KDTREE_EPS ||
            which == 2)
         {
-            gt->OcclusionTestLine(orig, sel, cnt);
+            gt->OcclusionTestLine(orig, sel, cnt, removeHidden);
         }
     } else {
         STriangleLl *ll;
@@ -788,7 +791,7 @@ void SKdNode::OcclusionTestLine(SEdge orig, SEdgeList *sel, int cnt) {
 
             if(tr->tag == cnt) continue;
 
-            SplitLinesAgainstTriangle(sel, tr);
+            SplitLinesAgainstTriangle(sel, tr, removeHidden);
             tr->tag = cnt;
         }
     }
diff --git a/src/polygon.cpp b/src/polygon.cpp
index 2bedbbe..7e1cfb7 100644
--- a/src/polygon.cpp
+++ b/src/polygon.cpp
@@ -453,7 +453,7 @@ void SEdgeList::MergeCollinearSegments(Vector a, Vector b) {
         SEdge *prev = &(l.elem[i-1]),
               *now  = &(l.elem[i]);
 
-        if((prev->b).Equals(now->a)) {
+        if((prev->b).Equals(now->a) && prev->auxA == now->auxA) {
             // The previous segment joins up to us; so merge it into us.
             prev->tag = 1;
             now->a = prev->a;
diff --git a/src/polygon.h b/src/polygon.h
index 930994e..4249e7a 100644
--- a/src/polygon.h
+++ b/src/polygon.h
@@ -306,8 +306,8 @@ public:
     void MakeCertainEdgesInto(SEdgeList *sel, int how, bool coplanarIsInter,
                                                 bool *inter, bool *leaky);
 
-    void OcclusionTestLine(SEdge orig, SEdgeList *sel, int cnt);
-    void SplitLinesAgainstTriangle(SEdgeList *sel, STriangle *tr);
+    void OcclusionTestLine(SEdge orig, SEdgeList *sel, int cnt, bool removeHidden);
+    void SplitLinesAgainstTriangle(SEdgeList *sel, STriangle *tr, bool removeHidden);
 
     void SnapToMesh(SMesh *m);
     void SnapToVertex(Vector v, SMesh *extras);
diff --git a/src/sketch.h b/src/sketch.h
index e700c48..e1c31aa 100644
--- a/src/sketch.h
+++ b/src/sketch.h
@@ -505,8 +505,8 @@ public:
     void GenerateBezierCurves(SBezierList *sbl);
     void GenerateEdges(SEdgeList *el, bool includingConstruction=false);
 
-    static void DrawAll(void);
-    void Draw(void);
+    static void DrawAll(bool drawAsHidden);
+    void Draw(bool drawAsHidden);
     double GetDistance(Point2d mp);
     Vector GetReferencePos(void);
 
@@ -767,6 +767,7 @@ public:
         ANALYZE        = 11,
         DRAW_ERROR     = 12,
         DIM_SOLID      = 13,
+        HIDDEN_EDGE    = 14,
 
         FIRST_CUSTOM   = 0x100
     };
diff --git a/src/solvespace.h b/src/solvespace.h
index a3fa2a9..729c708 100644
--- a/src/solvespace.h
+++ b/src/solvespace.h
@@ -345,7 +345,7 @@ void ssglFillPolygon(SPolygon *p);
 void ssglFillMesh(bool useSpecColor, RgbaColor color,
     SMesh *m, uint32_t h, uint32_t s1, uint32_t s2);
 void ssglDebugPolygon(SPolygon *p);
-void ssglDrawEdges(SEdgeList *l, bool endpointsToo);
+void ssglDrawEdges(SEdgeList *l, bool endpointsToo, hStyle hs);
 void ssglDebugMesh(SMesh *m);
 void ssglMarkPolygonNormal(SPolygon *p);
 typedef void ssglLineFn(void *data, Vector a, Vector b);
diff --git a/src/style.cpp b/src/style.cpp
index f7d8622..24b1998 100644
--- a/src/style.cpp
+++ b/src/style.cpp
@@ -24,6 +24,7 @@ const Style::Default Style::Defaults[] = {
     { { ANALYZE },      "Analyze",      RGBf(0.0, 1.0, 1.0), 1.0, 0 },
     { { DRAW_ERROR },   "DrawError",    RGBf(1.0, 0.0, 0.0), 8.0, 0 },
     { { DIM_SOLID },    "DimSolid",     RGBf(0.1, 0.1, 0.1), 1.0, 0 },
+    { { HIDDEN_EDGE },  "HiddenEdge",   RGBf(0.8, 0.8, 0.8), 2.0, 1 },
     { { 0 },            NULL,           RGBf(0.0, 0.0, 0.0), 0.0, 0 }
 };
 
@@ -94,7 +95,8 @@ void Style::FillDefaultStyle(Style *s, const Default *d) {
     s->exportable    = true;
     s->filled        = false;
     s->fillColor     = RGBf(0.3, 0.3, 0.3);
-    s->stippleType   = Style::STIPPLE_CONTINUOUS;
+    s->stippleType   = (d->h.v == Style::HIDDEN_EDGE) ? Style::STIPPLE_DASH
+                                                      : Style::STIPPLE_CONTINUOUS;
     s->stippleScale  = 15.0;
     s->zIndex        = d->zIndex;
 }
@@ -828,43 +830,41 @@ void TextWindow::ShowStyleInfo(void) {
             SS.UnitName());
     }
 
-    if(s->h.v >= Style::FIRST_CUSTOM) {
-        Printf(false,"%Ba   %Ftstipple type:%E");
+    Printf(false,"%Ba   %Ftstipple type:%E");
 
-        const size_t patternCount = Style::LAST_STIPPLE + 1;
-        const char *patternsSource[patternCount] = {
-            "___________",
-            "- - - - - -",
-            "__ __ __ __",
-            "-.-.-.-.-.-",
-            "..-..-..-..",
-            "...........",
-            "~~~~~~~~~~~",
-            "__~__~__~__"
-        };
-        std::string patterns[patternCount];
+    const size_t patternCount = Style::LAST_STIPPLE + 1;
+    const char *patternsSource[patternCount] = {
+        "___________",
+        "- - - - - -",
+        "__ __ __ __",
+        "-.-.-.-.-.-",
+        "..-..-..-..",
+        "...........",
+        "~~~~~~~~~~~",
+        "__~__~__~__"
+    };
+    std::string patterns[patternCount];
 
-        for(int i = 0; i <= Style::LAST_STIPPLE; i++) {
-            const char *str = patternsSource[i];
-            do {
-                switch(*str) {
-                    case ' ': patterns[i] += " "; break;
-                    case '.': patterns[i] += "\xEE\x80\x84"; break;
-                    case '_': patterns[i] += "\xEE\x80\x85"; break;
-                    case '-': patterns[i] += "\xEE\x80\x86"; break;
-                    case '~': patterns[i] += "\xEE\x80\x87"; break;
-                    default: oops();
-                }
-            } while(*(++str));
-        }
+    for(int i = 0; i <= Style::LAST_STIPPLE; i++) {
+        const char *str = patternsSource[i];
+        do {
+            switch(*str) {
+                case ' ': patterns[i] += " "; break;
+                case '.': patterns[i] += "\xEE\x80\x84"; break;
+                case '_': patterns[i] += "\xEE\x80\x85"; break;
+                case '-': patterns[i] += "\xEE\x80\x86"; break;
+                case '~': patterns[i] += "\xEE\x80\x87"; break;
+                default: oops();
+            }
+        } while(*(++str));
+    }
 
-        for(int i = 0; i <= Style::LAST_STIPPLE; i++) {
-            const char *radio = s->stippleType == i ? RADIO_TRUE : RADIO_FALSE;
-            Printf(false, "%Bp     %D%f%Lp%s %s%E",
-                (i % 2 == 0) ? 'd' : 'a',
-                s->h.v, &ScreenChangeStylePatternType,
-                i + 1, radio, patterns[i].c_str());
-        }
+    for(int i = 0; i <= Style::LAST_STIPPLE; i++) {
+        const char *radio = s->stippleType == i ? RADIO_TRUE : RADIO_FALSE;
+        Printf(false, "%Bp     %D%f%Lp%s %s%E",
+            (i % 2 == 0) ? 'd' : 'a',
+            s->h.v, &ScreenChangeStylePatternType,
+            i + 1, radio, patterns[i].c_str());
     }
 
     if(s->h.v >= Style::FIRST_CUSTOM) {