Vulkan Command Buffers: Recording GPU Commands

Write a C program that simulates a Vulkan command buffer recording and submission.

Requirements:

• Define an enum for command types: CMD_BEGIN_RENDER_PASS, CMD_BIND_PIPELINE, CMD_BIND_VERTEX_BUFFER, CMD_DRAW, CMD_END_RENDER_PASS, CMD_PIPELINE_BARRIER
• Define a struct Command with type and parameters (as a string description)
• Implement a command buffer as an array of up to 16 commands
• Record a typical frame:
  1. Begin render pass (color=clear, depth=clear)
  2. Bind graphics pipeline (shader: "lit_mesh")
  3. Bind vertex buffer (VBO id: 42)
  4. Bind descriptor set (texture: "diffuse", uniform: "MVP")
  5. Draw 36 vertices (a cube)
  6. End render pass
• Print each command as it is recorded with its index
• Simulate submission by printing "Submitting command buffer to graphics queue"
• Simulate GPU execution by printing each command in order with "GPU executing: ..."
• Calculate and print the total number of commands and the estimated CPU time saved by reusing the buffer
• Explain the difference between primary and secondary command buffers