With the old OpenGL API you could do this in like 10 lines of code (probably even less with SGI's GL).
With the new/shader-based API, well... https://learnopengl.com/Getting-started/Hello-Triangle
Vulkan - I don't even want to know.
Almost 1000: https://github.com/Overv/VulkanTutorial/blob/main/code/15_he...
(From Chapter 15 of the Vulkan Tutorial from vulkan-tutorial.com)
With the old OpenGL API you could do this in like 10 lines of code (probably even less with SGI's GL).
With the new/shader-based API, well... https://learnopengl.com/Getting-started/Hello-Triangle
Vulkan - I don't even want to know.