OpenGL Graphics Library

OpenGL (Open Graphics Library) is a cross-platform, cross-language application programming interface (API) used for rendering 2D and 3D vector graphics. It provides a low-level set of commands that give developers direct control over the graphics processing unit (GPU) to define and manipulate geometric objects, textures, lighting, and other visual elements. As a core specification within the field of computer graphics and visualization, OpenGL is implemented by hardware vendors and serves as the foundation for a vast array of applications, including video games, computer-aided design (CAD), and scientific data visualization.

1. Introduction to OpenGL
   1. What is OpenGL
      1. Graphics API Specification
      2. Cross-Platform Standard
      3. Hardware Abstraction Layer
   2. OpenGL as a State Machine
      1. State-Based Architecture
      2. Context Management
      3. State Queries and Modifications
   3. Rendering Pipeline Overview
      1. Fixed-Function vs Programmable Pipeline
      2. Data Flow Through Pipeline Stages
   4. History and Evolution
      1. Origins at Silicon Graphics
      2. OpenGL 1.x Era
         1. Immediate Mode Rendering
         2. Fixed-Function Pipeline
         3. Built-in Lighting Model
      3. OpenGL 2.x Era
         1. Introduction of Shaders
         2. GLSL Development
      4. OpenGL 3.x Era
         1. Deprecation Model
         2. Core vs Compatibility Profiles
      5. OpenGL 4.x Era
         1. Compute Shaders
         2. Tessellation
         3. Advanced Features
   5. OpenGL Architecture
      1. Client-Server Model
         1. Application as Client
         2. Driver as Server
         3. Command Queue Processing
      2. Graphics Processing Unit Role
         1. Parallel Processing Architecture
         2. GPU vs CPU Characteristics
         3. Memory Hierarchy
      3. Hardware Acceleration
         1. Driver Implementation
         2. Hardware Abstraction
         3. Performance Benefits
   6. OpenGL Profiles
      1. Core Profile
         1. Modern OpenGL Features
         2. Deprecated Function Removal
      2. Compatibility Profile
         1. Legacy Function Support
         2. Backward Compatibility
      3. Profile Selection Considerations
   7. OpenGL vs Other Graphics APIs
      1. DirectX Comparison
         1. Platform Differences
         2. Feature Parity
         3. Performance Characteristics
      2. Vulkan Comparison
         1. Low-Level Control
         2. Explicit Resource Management
         3. Multi-Threading Support
      3. Metal Comparison
         1. Apple Platform Integration
         2. API Design Philosophy
      4. WebGL Relationship
         1. Browser-Based Implementation
         2. OpenGL ES Subset
      5. OpenGL ES Overview
         1. Mobile and Embedded Focus
         2. Feature Differences