Added libarchive support to Dawn.

src/dawn/display/RenderPipeline.cpp

@@ -143,12 +143,21 @@ void RenderPipeline::renderSceneCamera(Scene *scene, Camera *camera) {
     }
   #endif
 
+  // Inject index into each item
+  itPassItem = shaderPassItems.begin();
+  while(itPassItem != shaderPassItems.end()) {
+    itPassItem->index = itPassItem;
+    ++itPassItem;
+  }
+
   // Now we've queued everything, let's sort the rendering queue by the priority
   std::sort(
     shaderPassItems.begin(),
     shaderPassItems.end(),
     [](struct ShaderPassItem &a, struct ShaderPassItem  &b) {
       if(a.priority == b.priority) {
+        // Compare indexes if w is same.
+        if(a.w == b.w) return a.index < b.index;
         return a.w < b.w;
       }
       return a.priority < b.priority;

src/dawn/display/shader/ShaderPass.hpp

@@ -8,9 +8,12 @@
 #include "display/mesh/Mesh.hpp"
 
 namespace Dawn {
+  struct ShaderPassItem;
+
   struct ShaderPassItem {
     Shader *shader = nullptr;
     int32_t priority = 0;
+    std::vector<struct ShaderPassItem>::iterator index;
 
     Mesh *mesh;
     int32_t start = 0;