Add backends

- Renamed GfxOpenGL to GfxOPenGL2
- Added GfxOpenGL3 backend for OpenGL 3.3+
- Added WIP DirectX9 backend
- Added structure for Citro3D
- Added linear Allocator

source/lithium/pools.cpp

@@ -9,16 +9,16 @@ namespace Li {
 PD::Pool<Vertex> pVtxPool;
 PD::Pool<u16> pIdxPool;
 
-void InitPools(size_t max_vertices) {
+PD_API void InitPools(size_t max_vertices) {
   pVtxPool.Init(max_vertices);
   pIdxPool.Init(max_vertices * 2);
 }
 
-Vertex* AllocateVertices(size_t count) { return pVtxPool.Allocate(count); }
+PD_API Vertex* AllocateVertices(size_t count) { return pVtxPool.Allocate(count); }
 
-u16* AllocateIndices(size_t count) { return pIdxPool.Allocate(count); }
+PD_API u16* AllocateIndices(size_t count) { return pIdxPool.Allocate(count); }
 
-void ResetPools() {
+PD_API void ResetPools() {
   pVtxPool.Reset();
   pIdxPool.Reset();
 }