3D API

1
3D API

• By
• Clayton Azzopardi
• (Group 10)

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Introduction

• Android uses the OpenGL ES 1.0 API
• Open Graphics Library for Embedded Systems
• Cross-language and Cross-platform
• Low-level and lightweight API
• Used to draw 2D and 3D graphics

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Advantages

• Open Industry Graphics Standard
• Innovative Controlled Evolution
• Ideal for Portable Devices
• Based on OpenGL
• Hardware Software Rendering

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Functionality (1/3) Geometry Processing

• Data types
• Vertex Arrays
• Used for drawing objects
• Specify colours, normals and texture coordinates
• Primitives
• e.g. POINTS, LINES, TRIANGLE etc.
• Coordinate Transformation
• Viewport
• DepthRange
• Vertex Lighting
• ShadeModel

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Functionality (2/3) Rasterization

• Converting a primitive to a 2D image on the
  screen
• Anti-aliasing
• Polygons Face Culling
• Polygon Offset

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Functionality (3/3) Texture Mapping

• Applying an image data to a primitive
• Supports only 2D textures
• Texture Clamping (edge_clamp)
• Wrapping (wrap_repeat)
• Compressed Texture
• Multitexture
• RGBA Packed Pixel Formats
• Filtering

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Examples (1/2)
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Examples (2/2)
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References

• http//www.khronos.org/opengles/
• OpenGL ES Common/Common-Lite Profile
  Specification Version 1.0.02
• The OpenGLR Graphics System A Specification
  (Version 1.3)
• OpenGL SUPERBIBLE Fourth Editionhttp//www.enfis.
  it/archives/14
• http//hcilab.uniud.it/MobiX3D/
• http//www.ist-ultra.org/publications/CAMTech_ULTR
  A_topics2006-2006_v01-3.pdf