保存多个实例数据的最佳方法

Question

I have a particle system and for that I render (for 1 particle effect for example) 100 quads with texture on it. If I add several particle effects it lags because each particle has its own velicity (2f vector), position (3f vec), etc... (Vectors are from LwJGL)

As a consequence each instance means like 5 or 6 data types. Now my question is:

Is there a way of making this better, so that not every instance has 5 new vectors? (And I know, that there are many other better ways of creating a particle system, but this one I choose was easy and I can practice "performance boosting"..

Answer 1

Ok, so, I will refer to this code where you probably get inspired by.

I also suppose you have at least GL 3.3 profile.

In theory, to optimaze at best you should move Map<ParticleTexture, List<Particle>> particles (using a texture atlas) on the gpu and upload only the changing data per-frame, like camera . But this is not easy to do in one step, so I suggest you to modify your current algorithm step by step by moving one thing at time on the gpu.

Some observations:

• in prepare() and finishRendering() , the enabling of the i-th VertexAttribArray is part of the vao, if you bind/unbind the vao, it's enough. glEnableVertexAttribArray and glDisableVertexAttribArray can be removed
• use uniform buffer, don't have all those single uniforms alone.
• loader.updateVbo() is quite expensive , it creates a FloatBuffer every render and clear the buffer before copying the data. You should allocate a float [] or a FloatBuffer just once, reuse it and call simply glBufferSubData , avoiding glBufferData