Explore the inner workings of Mesa3D, an open-source implementation of OpenGL and other graphics APIs, in this informative conference talk. Delve into the fundamentals of GPU functions and their interaction with computers, using the rendering of a triangle as a practical case study. Follow the journey from initiating EGL and compiling shaders to sending work to the GPU, gaining a comprehensive understanding of Mesa3D's architecture. Discover the significance of Mesa in the Linux graphics system and its growing importance in embedded platforms, where open-source drivers offer advantages in long-term maintainability, feature support, and customization. Learn why many companies are opting for open-source drivers in their products, reducing dependence on proprietary solutions from manufacturers.