Because OpenGL 2.0 was an open standard maintained by the Khronos Group, it brought high-end programmable graphics to Linux, Mac OS X, and professional workstations, challenging Microsoft's Windows-exclusive DirectX 9.
Decades of tutorials, textbooks, libraries (GLFW, GLAD, glm), and open-source engines exist. Where OpenGL Thrives opengl 20
Per-vertex data changed for every point drawn (e.g., vertex positions, normal vectors, or color arrays). These are only accessible inside the Vertex Shader. Because OpenGL 2