Merge pull request #30 from teamfisk/Rendering

Rendering Scenes

include/Engine/Core/Transform.h

@@ -0,0 +1,62 @@
+#ifndef Transform_h__
+#define Transform_h__
+
+#include "../GLM.h"
+#include "World.h"
+
+static class Transform
+{
+public:
+    static glm::vec3 AbsolutePosition(World* world, EntityID entity)
+    {
+        glm::vec3 position;
+
+        while (entity != EntityID_Invalid) {
+            ComponentWrapper transform = world->GetComponent(entity, "Transform");
+            EntityID parent = world->GetParent(entity);
+            position += AbsoluteOrientation(world, parent) * (glm::vec3)transform["Position"];
+            entity = parent;
+        }
+
+        return position;
+    };
+
+    static glm::quat AbsoluteOrientation(World* world, EntityID entity)
+    {
+        glm::quat orientation;
+
+        while (entity != EntityID_Invalid) {
+            ComponentWrapper transform = world->GetComponent(entity, "Transform");
+            orientation = glm::quat((glm::vec3)transform["Orientation"]) * orientation;
+            entity = world->GetParent(entity);
+        }
+
+        return orientation;
+    };
+
+    static glm::vec3 AbsoluteScale(World* world, EntityID entity)
+    {
+        glm::vec3 scale(1.f);
+
+        while (entity != EntityID_Invalid) {
+            ComponentWrapper transform = world->GetComponent(entity, "Transform");
+            scale *= (glm::vec3)transform["Scale"];
+            entity = world->GetParent(entity);
+        }
+
+        return scale;
+    };
+
+    static glm::mat4 ModelMatrix(EntityID entity, World* world)
+    {
+        glm::vec3 position = Transform::AbsolutePosition(world, entity);
+        glm::quat orientation = Transform::AbsoluteOrientation(world, entity);
+        glm::vec3 scale = Transform::AbsoluteScale(world, entity);
+
+        glm::mat4 modelMatrix = glm::translate(glm::mat4(), position) * glm::toMat4(orientation) * glm::scale(scale);
+        return modelMatrix;
+    }
+
+};
+
+#endif