First part of render texture commit

Added NzContext::EnsureContext and NzContext::GetThreadContext
Added NzCube
Added NzRect::GetCenter
Added methods to send vectors to shaders
Added NzRenderer::SetViewport
Fixed NzRect::ExtendTo calculations
Fixed NzImage::Update checks with level > 0
No longer use glTexStorage when creating a texture to prevent a bug
NzBuffer's Lock and Unlock operations renamed to Map and Unmap
NzVector2/3/4 can now cast implicitly to a pointer
Optimized compilation time of String.hpp
Optimized normalisaton of quaternions
Optimized passing uniforms to shaders
Quaternion now automaticaly Normalize h
Removed macro definition of NAZARA_RENDERER_OPENGL from Renderer
Removed implicit cast from NzVector2/3/4 to NzString
Renamed nzBufferLock to nzBufferAccess
Renamed NzRenderTarget::CanActivate to IsValid

include/Nazara/Renderer/Renderer.hpp

@@ -8,6 +8,7 @@
 #define NAZARA_RENDERER_HPP
 
 #include <Nazara/Prerequesites.hpp>
+#include <Nazara/Math/Rect.hpp>
 #include <map>
 #include <tuple>
 
@@ -87,7 +88,6 @@ enum nzRendererComparison
 
 enum nzRendererParameter
 {
-	nzRendererParameter_AlphaTest,
 	nzRendererParameter_Blend,
 	nzRendererParameter_ColorWrite,
 	nzRendererParameter_DepthTest,
@@ -135,10 +135,12 @@ class NAZARA_API NzRenderer
 		unsigned int GetMaxTextureUnits() const;
 		NzShader* GetShader() const;
 		NzRenderTarget* GetTarget() const;
+		NzRectui GetViewport() const;
 
 		bool HasCapability(nzRendererCap capability) const;
 		bool Initialize();
 
+		void SetBlendFunc(nzBlendFunc src, nzBlendFunc dest);
 		void SetClearColor(const NzColor& color);
 		void SetClearColor(nzUInt8 r, nzUInt8 g, nzUInt8 b, nzUInt8 a = 255);
 		void SetClearDepth(double depth);
@@ -156,6 +158,7 @@ class NAZARA_API NzRenderer
 		bool SetTarget(NzRenderTarget* target);
 		bool SetVertexBuffer(const NzVertexBuffer* vertexBuffer);
 		bool SetVertexDeclaration(const NzVertexDeclaration* vertexDeclaration);
+		void SetViewport(const NzRectui& viewport);
 
 		void Uninitialize();