adding gfx and ui stuff

gfx/world/scene.h

@@ -0,0 +1,75 @@
+#ifndef DJSTDLIB_GFX_SCENE_H
+#define DJSTDLIB_GFX_SCENE_H
+
+#include "../../core.h"
+#include "../../vendor/raymath.h"
+#include "../Mesh.h"
+#include "../Texture.h"
+
+DefineList(int32, Handle);
+
+enum EntityFlags {
+    EntityFlags_None=0,
+    EntityFlags_Visible=1<<0,
+    EntityFlags_Dead=1<<1,
+    EntityFlags_Render=1<<2,
+};
+
+typedef struct Entity Entity;
+struct Entity {
+    int32 graphNodeHandle;
+    uint64 flags;
+    Vec4 color;
+    Mesh *mesh;
+    Texture *tex;
+
+    // Free list
+    int32 next;
+};
+DefineList(Entity, Entity);
+
+typedef struct SceneGraphNode SceneGraphNode;
+struct SceneGraphNode {
+    Matrix local;
+    Matrix world;
+    Vec3 translation;
+    Quaternion rotation;
+    Vec3 scale;
+    int32 entityHandle;
+    int32 parentHandle;
+
+    /** Next free in the free list */
+    int32 next;
+
+    /** Next child in child list in scene hierarchy */
+    int32 nextSibling;
+    int32 firstChild;
+};
+DefineList(SceneGraphNode, SceneGraphNode);
+
+typedef struct Scene Scene;
+struct Scene {
+    int32 sceneRoot;
+    EntityList entities;
+    int32 nextFreeEntity;
+    /** @internal */
+    SceneGraphNodeList graphNodes;
+    int32 nextFreeNode;
+};
+
+int32 createEntity(Scene *s);
+Entity *getEntity(Scene *s, int32 id);
+SceneGraphNode *getSceneGraphNode(Scene *s, int32 id);
+int32 createSceneGraphNode(Scene *s);
+Scene createScene(Arena *arena);
+void initGraphNode(SceneGraphNode *n);
+void recalcSceneGraphNode(Scene *s, int32 parentHandle);
+void recalcScene(Scene *s);
+void removeEntity(Scene *s, int32 entityHandle);
+void removeSceneGraphNode(Scene *s, int32 graphNodeHandle);
+void sceneNodeAddNode(Scene *s, int32 recipientNodeHandle, int32 graphNodeHandle);
+SceneGraphNode *getSceneGraphNodeForEntity(Scene *s, int32 entityHandle);
+void show(Scene *s, uint32 graphNodeHandle);
+void hide(Scene *s, uint32 graphNodeHandle);
+
+#endif