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Why would you want to use glBufferSubData instead of glBufferData?
When replacing the entire data store, consider using glBufferSubData rather than completely recreating the data store with glBufferData. This avoids the cost of reallocating the data store.
What is glBufferSubData?
glBufferSubData and glNamedBufferSubData redefine some or all of the data store for the specified buffer object. Data starting at byte offset offset and extending for size bytes is copied to the data store from the memory pointed to by data .
What is glBufferData?
The function glBufferData(…) stores vertex data into a VBO. glBufferData(GL_ARRAY_BUFFER,sizeof(data), data, GL_STATIC_DRAW); This is usually the same binding point when the object was bound, i.e. GL_ARRAY_BUFFER.
What are OpenGL buffers?
Buffer Objects are OpenGL Objects that store an array of unformatted memory allocated by the OpenGL context (AKA the GPU). These can be used to store vertex data, pixel data retrieved from images or the framebuffer, and a variety of other things.
What are OpenGL objects?
An OpenGL Object is an OpenGL construct that contains some state. When they are bound to the context, the state that they contain is mapped into the context’s state. Thus, changes to context state will be stored in this object, and functions that act on this context state will use the state stored in the object.
Does Triple Buffering improve FPS?
What triple buffering will do is provide an increase in FPS, but it uses a lot of video memory, plus it adds latency, which is IMO much worse than the increase in peak FPS because at the times when you need your FPS to be higher most, triple buffering makes it lower.
What’s the difference between GL and glbufferstorage?
With glBufferStorage (…), the buffer’s size is set for the lifetime of the object (immutable) and it is an error ( GL_INVALID_OPERATION) to call glBufferStorage (…) again once it has been allocated immutably. In short, it is the data store (storage characteristics) that is immutable, not the actual data.
What happens when you call glbufferdata multiple times?
With glBufferData (…), you can call that command multiple times on the same object and it will orphan the old memory and allocate new storage.
Which is better glbuffersubdata or glmapbufferrange?
If you intend to update the vertices often (every frame or so), I recommend avoiding glBufferSubData, which requires one more memcpy in the driver. glMapBuffer/glMapBufferRange usually gets you more perf. If you update only rarely, glBufferSubData will do fine. Thanks for contributing an answer to Stack Overflow!
What is GL _ ARB _ texture _ storage extension in OpenGL?
The GL_ARB_texture_storage extension added immutable storage for texture object (and was subsequently incorporated into OpenGL 4.2). This extension further applies the concept of immutable storage to buffer objects.