CODEWITHSUNDEEP
javaopenglopengl-3
FunnyFunkyBuggy
FunnyFunkyBuggy

Reputation: 613

How do work with varying number of vertices in OpenGL gl3?

I am learning JOGL on my own. I have just switched from GL2 to GL3. I found that there are very few tutorials on the GL3. Also, I found that GL3 is completely different from GL2. As far as I know, many ppl used buffer to hold all the vertices and bind them to OpenGL. But, when they were initialising the buffers, they used arrays, which are fixed in length. How am I going to work on varying number of vertices or objects, if the number of vertices was fixed from the beginning? Are there any simple examples? In general, how can I make my program more "dynamic"? (i.e. render a user-defined 3D world)

Upvotes: 1

Views: 98

Answers (1)

Greffin28
Greffin28

Reputation: 257

The best i can think of is creating a large buffer at the initializing stage and modify the data with glBufferSubData(). Other way is recreate the buffer with glBufferData() though this one is not preferable because of how expensive it is to recreate the buffer every time a new entity/object is created to/removed from the world (Probably fine once in a while).

Upvotes: 1

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