From bdf53a5ab8b5fdafc48f1abe31055b187045461c Mon Sep 17 00:00:00 2001
From: ac-stef <ac_stef@users.sf.net>
Date: Sat, 6 Jun 2015 14:57:28 +0200
Subject: [PATCH] show preview of textures during editing

When textures of the map geometry are changed, five textures around the
current pick from the "last used" stack are shown. The texture assigned
to the "sky" slot is not shown. Instead, a plain blue rectangle is used.

hudtexttl
  Time to show texture preview (in milliseconds).

DOCREF hudtexttl
---
 source/src/editing.cpp   | 44 ++++++++++++++++++++++++++++++++++++++++
 source/src/renderhud.cpp |  3 +++
 2 files changed, 47 insertions(+)

diff --git a/source/src/editing.cpp b/source/src/editing.cpp
index db5ed648..cd7e04bc 100644
--- a/source/src/editing.cpp
+++ b/source/src/editing.cpp
@@ -693,6 +693,49 @@ COMMAND(editheight, "ii");
 
 // texture type : 0 floor, 1 wall, 2 ceil, 3 upper wall
 
+void renderhudtexturepreview(int slot, int pos, bool highlight)
+{
+    Texture *pt = slot != DEFAULT_SKY ? lookupworldtexture(slot, false) : NULL;
+    int hs = (highlight ? 0 : (FONTH / 3) * 2), bs = VIRTW / 8 - hs, border = FONTH / (highlight ? 2 : 4), x = 2 * VIRTW - VIRTW / 8 - FONTH + hs / 2, y = VIRTH * (6 - pos) / 4, xs, ys;
+    blendbox(x - border, y - border, x + bs + border, y + bs + border, false);
+    if(pt)
+    {
+        if(pt->xs > pt->ys) xs = bs, ys = (xs * pt->ys) / pt->xs;  // keep aspect ratio of texture
+        else ys = bs, xs = (ys * pt->xs) / pt->ys;
+        int xt = x + (bs - xs) / 2, yt = y + (bs - ys) / 2;
+        extern int fullbrightlevel;
+        framedquadtexture(pt->id, xt, yt, xs, ys, 1, fullbrightlevel);
+    }
+    else
+    { // sky slot: just show blue instead of the texture
+        color c(0, 0, 0.6f, 1);
+        blendbox(x, y, x + bs, y + bs, false, -1, &c);
+    }
+    if(highlight)
+    {
+        glDisable(GL_BLEND);
+        glDisable(GL_TEXTURE_2D);
+        border /= 2;
+        box2d(x - border, y - border, x + bs + border, y + bs + border, 200);
+        glEnable(GL_BLEND);
+    }
+}
+
+static int lastedittex = 0;
+VARP(hudtexttl, 0, 2500, 10000);
+
+void renderhudtexturepreviews()
+{
+    if(lastedittex && hudtexttl && (lastmillis - lastedittex) < hudtexttl)
+    {
+        int atype = lasttype == 3 ? 1 : lasttype;
+        int idx = curedittex[atype];
+        if(idx < 0) idx = 0;
+        int startidx = clamp(idx - 2, 0, 251);
+        loopi(5) renderhudtexturepreview(hdr.texlists[atype][startidx + i], i, startidx + i == idx);
+    }
+}
+
 void edittexxy(int type, int t, block &sel)
 {
     loopselxy(sel, switch(type)
@@ -720,6 +763,7 @@ void edittex(int *type, int *dir)
         addmsg(SV_EDITT, "ri6", sels[i].x, sels[i].y, sels[i].xs, sels[i].ys, *type, t);
     }
     unsavededits++;
+    lastedittex = lastmillis;
 }
 COMMAND(edittex, "ii");
 
diff --git a/source/src/renderhud.cpp b/source/src/renderhud.cpp
index f5181fa6..d6e3fb07 100644
--- a/source/src/renderhud.cpp
+++ b/source/src/renderhud.cpp
@@ -1054,6 +1054,9 @@ void gl_drawhud(int w, int h, int curfps, int nquads, int curvert, bool underwat
         if(!m_botmode) draw_textf("SCROLL to change player", left - (text_width("SCROLL to change player") + FONTH/2), top+80);
     }
 
+    void renderhudtexturepreviews();
+    if(editmode) renderhudtexturepreviews();
+
     /* * /
     glLoadIdentity();
     glOrtho(0, VIRTW*3/2, VIRTH*3/2, 0, -1, 1);