Love of fashion ticket to success [Buy]5/13/2013 1:43:18 PM
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How can I organize render and transformation data in a scalable fashion [Shop]5/13/2013 1:36:24 PM
´╗┐How can I organize render and transformation data in a scalable fashion I already have working solutions, they just. feel wrong. All my calls related to OpenGL are tucked away in a separate class called RenderManager (this includes creation of VBOs and IBOs, texture IDs and shader programs) and rendering. I called the creation of OpenGL objects logging in and out, so majority of this action is invoked from the ResourceManager object upon loading of data. However, a lot of geometry (level) is generated dynamically and therefore some RenderManager calls to create the VBOs/IBOs is scattered throughout the level class. Now, I have a Renderable interface which returns the (single) transformation matrix and a RenderOp object when it is time for rendering. RenderOps is an object that has Vertex/Index Buffer pointers (has actual geom. data which in turn has VBO/IBO indices) and some parameters such as whether to use the index buffer and if the RenderOp needs blending and stuff. The game objects reside in the World class (single-dimension arrays). These game objects are added upon their creation, and are derived from Entity interface. Entity is able to return the number of Renderable-type objects within as well as the actual pointer to a Renderable at a given index. The magic happens when the main loop traverses the World. First it collects all Light objects visible from within Frustum. Then it collects Entity object that's within Frustum (it gets added to std::vector inside RenderView if it is), and then it checks that same object to see if it is inside any of the visible Light's bounding volumes (and gets added into Light's std::vector). Then the RenderView is passed onto the RenderManager class, which extracts appropriate Renderables from each Entity, applies Renderable's shader, then applies Renderable's textures, then stores the transforms inside itself and promptly shoves them down the programmable pipeline's throat along with attributes stored inside the RenderOperation (that gets extracted from Renderable as well). Last note - I have NO way to render debug data, which is extremely annoying. A lot of what I am doing feels wrong. My question is, how do you organize all your Renderable and Transformation data to facilitate your rendering needs? I am burning out thinking of semi-flexible ways of managing this data and I want to hear your ways. I am not a big fan of scene graphs, and consequently don't really want to implement one as I feel there are no real hierarchies inside the game, but I feel like I'm running myself into a corner. Please throw me a bone here, how do you manage all this data?? I'm tired of freaking out, I will take any way out. Books, links, personal suggestions, anything. Please. EDIT: Perhaps - would you suggest an event based rendering system? If so, how would you design it? Everything that would qualify as a "GameObject" (in a strict OOP perception model) is called an entity. Entities are represented by just integer keys retrieved from an entity store. Entities can consist of any number of components. Those contain the real functionality and would be Mesh, Material, Transform, CollisionVolume, AudioPlayer, etc. When one wants to attach a component to an entity, they hand the entity key to a store for the wanted component. Behind the scenes, that store creates another component in a linear array of same-type components and remembers that whenever someone wants the retrieve a component with the same entity key, it's the one just created. That way, if some components can be "updated" in bulk without knowing about anything else (Collision Volumes for instance) they are all linearly laid out in the component store's memory and if someone wants to retrieve just one of them, they can do so via the key. So much for the general thing. Now regarding rendering, I'm still left in some kind of halfway immediate mode, where I tell the renderer the entities I want rendered via entity key. Mesh, Material, Transform (wich is Scale, Rotation, Transformation). Mesh- and Material-ID as retrieved from their component stores are aggregated into a sort-key, so that "entities to be drawn" are then grouped by similar meshes and materials. The Transforms have to sorted alongside so I can pack them up and provide them to instanced draw calls where many entities with the same mesh are submitted with just a single draw call and all necessary position data. Christer Ericson has a great post on this on his blog. I'm just throwing this out, not knowing whether that last bit is a good idea at all (in OpenGL ES, anyway). I'm also aware that I glossed over a lot of details but it ought to be kept simple so you can evaluate the idea. That looks to be an interesting alternative way to do it. Do you keep all the possible component indices in your Entity class and then just set them to point to the valid component as it becomes necessary? Kind of like handles? Components as I understood are stored in an array side-by-side (but not 1-to-1) with Entity objects, correct? That interesting, I haven tried a component based pattern yet, stuck to inheritance though it came out pretty ugly on my end. Kaa Mar 7 '12 at 14:42 No problem- It certainly was a wall of text :) For now, there is no such thing as an entity with multiple collision volumes. What I can do, though, is have multiple entities - each with their own collision volume - and tie them together so they move in the world coherently. For that reason I got a component that called LocalTransform which is basically a standard transform that generates it positional data in relation to another (Non-local)transform that it is tied to upon initialization. So I can have one (base)transform and several LocalTransforms attached to it with, say, no offset. Koarl Mar 8 '12 at 8:49 As for the Transform redundancy thing - A Transform in my Framework consists of Translation (float3), Scale(float) and a Unit Quaternion for Rotation (float4). That merely 32 Bytes of data. I don think redundancy is killing me there. But it certainly helps keeping things uniform. I have a function that converts both types of Transforms (non-local and local) into world- or view-matrices, as the shaders still need matrices for vertex transformation. This also has the upside of being able to attach the viewpoint to whatever entity I want. Koarl Mar 8 '12 at 8:52 Got it! I really like your idea of component based design, and will definitely implement something similar. If I may follow up: the way I understand it is that you have 1 type of component per store, is that correct? So for renderable component you do not have a "regular" component, skinned component, etc. I guess that is the case since you probably want optimal cache hits when traversing the components in a given store. Do you feel that this limits the flexibility of the system? I sure it does wonders for multithreading :) Kaa Mar 8 '12 at 23:07


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