Only update the shader point size in OpenGL ES 2 when it's been modified, rather than before every draw.

src/modules/graphics/opengl/Shader.h

@@ -182,6 +182,7 @@ public:
 	bool sendBuiltinMatrix(BuiltinUniform builtin, int size, const GLfloat *m, int count);
 	bool sendBuiltinFloat(BuiltinUniform builtin, int size, const GLfloat *m, int count);
 	void checkSetScreenParams();
+	void checkSetPointSize(float size);
 
 	const std::map<std::string, Object *> &getBoundRetainables() const;
 
@@ -250,6 +251,8 @@ private:
 	Canvas *lastCanvas;
 	OpenGL::Viewport lastViewport;
 
+	float lastPointSize;
+
 	// Counts total number of textures bound to each texture unit in all shaders
 	static std::vector<int> textureCounters;