How CPU Interacts with GPU 🕹

The CPU interacts with the GPU through the system's bus (usually PCIe) and driver-level APIs. Here's a breakdown of the process:

🔄 How the Interaction Happens:

1. CPU Prepares Work

• Runs the main game or application logic.
• Determines what needs to be rendered (e.g., scene, camera angle, models).

1. Sends Commands to GPU

• Uses graphics APIs like:

  • DirectX (Windows)
  • OpenGL / Vulkan
  • Metal (macOS)

• These APIs translate CPU intentions into GPU-friendly instructions.

1. Data Transfer via PCIe

• CPU sends:

  • Textures
  • Geometry (models, vertices)
  • Shaders
  • Instructions

• All transferred over the PCIe bus into the GPU's VRAM.

1. GPU Executes Tasks

• GPU receives and processes rendering tasks in parallel.
• Uses thousands of cores to efficiently compute visuals.

1. Result Output to Display

• GPU sends the final rendered frame to the display via HDMI or DisplayPort.

Summary:

• CPU = Director: Plans and instructs.
• GPU = Worker: Executes rendering and parallel computations.
• Communication relies on PCIe bus and graphics APIs.