metal: nogame and error screens work.

- implement love.graphics.setColor
- implement default textures
- hacky implementation of default uniform data
- use texture swizzles to set up LA8 (text) texture data
- shader reflection work

src/modules/graphics/metal/Graphics.h

@@ -109,12 +109,17 @@ public:
 
 	id<MTLSamplerState> getCachedSampler(const SamplerState &s);
 
-	static Graphics *getInstance() { return Module::getInstance<Graphics>(M_GRAPHICS); }
+	StreamBuffer *getUniformBuffer() const { return uniformBuffer; }
+	Buffer *getDefaultAttributesBuffer() const { return defaultAttributesBuffer; }
+
+	static Graphics *getInstance() { return graphicsInstance; }
 
 	id<MTLDevice> device;
 
 private:
 
+	static Graphics *graphicsInstance;
+
 	enum StateType
 	{
 		STATE_BLEND,
@@ -166,6 +171,7 @@ private:
 
 	id<MTLDepthStencilState> getCachedDepthStencilState(const DepthState &depth, const StencilState &stencil);
 	void applyRenderState(id<MTLRenderCommandEncoder> renderEncoder, const vertex::Attributes &attributes);
+	void applyShaderUniforms(id<MTLRenderCommandEncoder> renderEncoder, Shader *shader);
 
 	id<MTLCommandQueue> commandQueue;
 
@@ -180,6 +186,14 @@ private:
 	uint32 dirtyRenderState;
 	bool windowHasStencil;
 
+	StreamBuffer *uniformBuffer;
+	StreamBuffer::MapInfo uniformBufferData;
+	size_t uniformBufferOffset;
+
+	Buffer *defaultAttributesBuffer;
+
+	Texture *defaultTextures[TEXTURE_MAX_ENUM];
+
 	std::map<uint64, void *> cachedSamplers;
 
 }; // Graphics