add 'rotate' and 'origin' box modifier to vcm

src/coders/vcm.cpp

@@ -1,6 +1,8 @@
 #include "vcm.hpp"
 
-#include <iostream>
+#include <algorithm>
+#include <glm/gtc/quaternion.hpp>
+#include <glm/gtc/matrix_transform.hpp>
 
 #include "xml.hpp"
 #include "util/stringutil.hpp"
@@ -73,6 +75,29 @@ static void perform_box(const xmlelement& root, model::Model& model) {
     auto from = root.attr("from").asVec3();
     auto to = root.attr("to").asVec3();
 
+    glm::vec3 origin = (from + to) * 0.5f;
+    if (root.has("origin")) {
+        origin = root.attr("origin").asVec3();
+    }
+
+    glm::mat4 tsf(1.0f);
+    from -= origin;
+    to -= origin;
+    tsf = glm::translate(tsf, origin);
+
+    if (root.has("rotate")) {
+        auto text = root.attr("rotate").getText();
+        if (std::count(text.begin(), text.end(), ',') == 3) {
+            auto quat = root.attr("rotate").asVec4();
+            tsf *= glm::mat4_cast(glm::quat(quat.w, quat.x, quat.y, quat.z));
+        } else {
+            auto rot = root.attr("rotate").asVec3();
+            tsf = glm::rotate(tsf, glm::radians(rot.x), glm::vec3(1, 0, 0));
+            tsf = glm::rotate(tsf, glm::radians(rot.y), glm::vec3(0, 1, 0));
+            tsf = glm::rotate(tsf, glm::radians(rot.z), glm::vec3(0, 0, 1));
+        }
+    }
+
     UVRegion regions[6] {};
     regions[0].scale(to.x - from.x, to.y - from.y);
     regions[1].scale(from.x - to.x, to.y - from.y);
@@ -142,7 +167,7 @@ static void perform_box(const xmlelement& root, model::Model& model) {
         bool enabled[6] {};
         enabled[i] = true;
         auto& mesh = model.addMesh(texfaces[i], shading);
-        mesh.addBox(center, halfsize, regions, enabled);
+        mesh.addBox(center, halfsize, regions, enabled, tsf);
     }
 }