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>you want to push the triangle data into the card in a single (or few) API calls

glBufferSubData?

>then submit as few draw calls as you can manage

glDrawElements?

Nobody used glBegin/glEnd in the past 20 years...

i was paraphrasing for someone who might not be familiar with graphics basics, let alone architectures of bindless/GPU-driven rendering pipelines :)

OpenGL 3 deprecated glBegin/glEnd, but there is still state, and a lot of it. none of the OpenGL API is re-entrant, for instance..