Yeah for PS4 OpenGL worked but wasn’t their API, they have GNM. Yes but they all have a similar design around treating the GPU as a buffer store. You’re right

Yeah for PS4 OpenGL worked but wasn’t their API, they have GNM. Yes but they all have a similar design around treating the GPU as a buffer store. You’re right about Mantle but that was the inspiration of many. They each took some concepts. I’m not an expert on driving decisions behind them. Just from my own experience. Vulkan is much more difficult and verbose than the others. This is one of the main hurtles to Vulkan.