Some enhencement ideas for the posteffect system

[klepto2]

I have some suggestions to the posteffectsystem:

These ideas for function might make the managing of posteffects much easier:

• RemovePostEffect(camera,index)
• GetPostEffect(camera,index)
• GetPostEffects(camera)
• SetPostEffectOrder(camera,index,newindex)
• Enable-/Disable- PostEffect(camera,index)

The editor currently lacks access to configuration of posteffects, while some already define uniforms, they currently can only be changed by code, not in the editor. As a start, i would suggest something like this:

{
    "posteffect":
    {
		"uniforms":
		[
			{
				"intensity": { "label": "Intensity", "type": "float", "default": 1.0 },
				"color": { "label": "Effect Color", "type": "vec3", "default": "1.0,0.0,1.0" }
			}
		],
        "textures":
        [
            {
                "size": [0.25, 0.25],
                "format": 37
            }
        ],
        "subpasses":
        [
            {    
                "samplers": ["PREVPASS"],
                "colorattachments": [0],
                "shader":
                {
                    "float32":
                    {
                        "fragment": "Shaders/PostEffects/GodRays.frag"
                    }
                }
            },
            {
                "samplers": ["PREVPASS", 0],
                "shader":
                {
                    "float32":
                    {
                        "fragment": "Shaders/PostEffects/GodRaysResolve.frag"
                    }
                }
            }
        ]
    }
}

This way the uniforms can be parsed by the editor and a ui can be generated. Maybe with an optional groupname to make it more clear.