How do I change my OpenGL buffer?
You can load any amount of data (up to the size of the buffer) using glBufferSubData , glMapBuffer , or any of the other routines for passing data. The only way to resize the buffer is to call glBufferData with a new size for the same buffer id (the value returned from glGenBuffers ).
What are the Open GL 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.
Which function sends vertex data to the GPU?
Vertex buffer object (VBO) allows vertex array data to be stored in high-performance graphics memory on the server side and promotes efficient data transfer.
How does OpenGL create a buffer of uninitialized data?
In fact, if you call, for example glBufferData ( GL_ARRAY_BUFFER, bufferSize, NULL, GL_DYNAMIC_DRAW ); OpenGL will create a buffer of bufferSize bytes of uninitialized data. You can load any amount of data (up to the size of the buffer) using glBufferSubData, glMapBuffer, or any of the other routines for passing data.
Do you have to call glbuffersubdata to resize the buffer?
Edit: glBufferSubData is only if you want to replace data; to resize the buffer instead, you have to call glBufferData. Also, you don’t have to destroy the buffer first and generate a new one.
Is there a way to resize the buffer size?
You can load any amount of data (up to the size of the buffer) using glBufferSubData, glMapBuffer, or any of the other routines for passing data. The only way to resize the buffer is to call glBufferData with a new size for the same buffer id (the value returned from glGenBuffers ).
How does OpenGL allocate memory in the second argument?
That is, OpenGL will allocate the amount of memory you specify in the second argument of glBufferData (which isn’t listed in the OP). In fact, if you call, for example glBufferData ( GL_ARRAY_BUFFER, bufferSize, NULL, GL_DYNAMIC_DRAW ); OpenGL will create a buffer of bufferSize bytes of uninitialized data.