Introduction to OpenGL. What is OpenGL OpenGL is a low-level software interface to graphics hardware No commands for performing windowing tasks or obtaining.

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Presentation transcript:

Introduction to OpenGL

What is OpenGL OpenGL is a low-level software interface to graphics hardware No commands for performing windowing tasks or obtaining user input are included. No high-level commands for describing models of 3D objects are provided. Why low level You can access graphics hardware directly Independent to window system, cross platform

What is OpenGL High level enough, so it ’ s independent to graphics hardware Industry standard

API hierarchy

What OpenGL provides Draw with points, lines, and polygons. Matrix Operations (Transformations) Hidden Surface Removal (Z-Buffer) Lighting (Phong model) Gouraud Shading Texture mapping Pixels operations

The Buffers A buffer is a memory area in the graphics hardware for some special purposes. An OpenGL system can manipulate the four buffers: Color buffers Depth buffer (Z-Buffer) Stencil buffer Accumulation buffer – Will be described in later chapter.