OpenGL ES 3.0 2013
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OpenGL ES 3.0 2013
- 1. OpenGL ES 3.0 Mindos at HsinChu Coders
- 2. New Ground for Personal Devices
- 3. x86 Windows DirectX OpenGL ARM Linux / BSD OpenGL ES New Ground for Personal Devices
- 4. New Generation We learned from the past and get rid of legacy interfaces.
- 7. What is OpenGL ES?
- 8. OpenGL for Embedded Systems
- 9. Where can be found? iPhone iPad Android SmartTV Android Game Console OUYA, Shield, ......
- 10. Also in .... Desktop Browsers WebGL is OpenGL 2.0
- 11. Difference to OpenGL? Simpler Point, Line, Triangle only No quad Draw commands only No glBegin / glEnd No tessellation, curves, NURBS
- 12. Simple is Good Easy to implement Easy to learn Less Hardware cost No legacy interface
- 13. Mobile Hardware Environment No standalone Visual Memory Shared with main memory Limited only the size of main memory.
- 14. Mobile Hardware Environment Power consumption must be controlled.
- 15. Mobile Hardware Environment Run at much lower frequency iPhone 5 CPU 1.3GHz GPU 0.266GHz
- 16. Why Hardware ? 100 ~ 1000 times than software implementation
- 17. Why Hardware ? Large amount of special functions. Trigonometric functions, reciprocal square root, etc...
- 18. Why Hardware ? Large amount computation with less branch Data Parallelism
- 19. Examples Basemark ES 3.0 Basemark ES 3.0
- 25. Vertex Shading Draw Calls Primitive Assembly Rasterization Fragment Shading Texture States State Calls Vertex Framebuffer Memory Outputs Texture Objects Transform Feedback Output Buffer Calls
- 26. Vertex Shading
- 28. Rasterization
- 29. Fragment Shading Using Interpolated value from VS out
- 30. Fragment ShadingTexture Using Interpolated value from VS output as Texture coordinate
- 31. Fragment ShadingTexture Using Interpolated value from VS output as Texture coordinate
- 32. Fragment ShadingTexture Using Interpolated value from VS output as Texture coordinate
- 33. Draw Commands GL Driver Draw Calls Vertex Shader Attributes
- 35. glDrawArrays() GL Driver Vertex Shader glDrawArrays Data For each vertex Attributes Data For all the vertices Uniforms
- 36. glDrawArrays() cont. GL Driver Vertex Shader glDrawArrays Data For all the vertices Uniforms Attributes Data For Vertex 0 Data For Vertex 1 Data For Vertex 2 …… ……
- 37. Attr 0 for Vertex 0 …… Attr 0 for Vertex 1 Attr 0 for Vertex 2 Attr 1 for Vertex 0 …… Attr 1 for Vertex 1 Attr 1 for Vertex 2 glDrawArrays() cont. GL Driver Vertex Shader glDrawArrays Data For all the vertices Uniforms Attributes Attr 0 for Vertex 0 …… Attr 0 for Vertex 1 Attr 0 for Vertex 2 Attr 1 for Vertex 0 …… Attr 1 for Vertex 1 Attr 1 for Vertex 2
- 38. Array of structures Attr 0 for Vertex 0 Attr 1 for Vertex 0 Attr 0 for Vertex 1 Attr 1 for Vertex 1 …… Attr 0 for Vertex 2 Attr 1 for Vertex 2
- 39. Attr 0 for Vertex 0 …… Attr 0 for Vertex 1 Attr 0 for Vertex 2 Attr 1 for Vertex 0 …… Attr 1 for Vertex 1 Attr 1 for Vertex 2 Structure of Arrays
- 40. GL Driver Vertex Shader GL Driver Vertex Shader glDrawArraysglDrawArrays Data For Vertex 0 Data For Vertex 1 Data For Vertex 2 …… …… Data For all the vertices Uniforms Calculate Vertex 0 Attributes
- 41. Data For Vertex 0 Data For Vertex 1 Data For Vertex 2 …… …… GL Driver Vertex Shader GL Driver Vertex Shader glDrawArraysglDrawArrays Data For all the vertices Uniforms Calculate Vertex 1 Attributes
- 42. Data For Vertex 0 Data For Vertex 1 Data For Vertex 2 …… …… Data For Vertex 0 Data For Vertex 1 Data For Vertex 2 …… …… GL Driver Vertex Shader GL Driver Vertex Shader glDrawArraysglDrawArrays Data For all the vertices Uniforms Calculate Vertex 2 Attributes
- 43. Attr 0 for Vertex 0 …… Attr 0 for Vertex 1 Attr 0 for Vertex 2 Attr 1 for Vertex 0 …… Attr 1 for Vertex 1 Attr 1 for Vertex 2 Attr 0 for Vertex 0 …… Attr 0 for Vertex 1 Attr 0 for Vertex 2 Attr 1 for Vertex 0 …… Attr 1 for Vertex 1 Attr 1 for Vertex 2 Attr 0 for Vertex 0 …… Attr 0 for Vertex 1 Attr 0 for Vertex 2 Attr 1 for Vertex 0 …… Attr 1 for Vertex 1 Attr 1 for Vertex 2 GL Driver Vertex Shader GL Driver Vertex Shader glDrawArraysglDrawArrays Data For all the vertices Uniforms Calculate Vertex 0 Attributes
- 44. Attr 0 for Vertex 0 …… Attr 0 for Vertex 1 Attr 0 for Vertex 2 Attr 1 for Vertex 0 …… Attr 1 for Vertex 1 Attr 1 for Vertex 2 GL Driver Vertex Shader GL Driver Vertex Shader glDrawArraysglDrawArrays Data For all the vertices Uniforms Calculate Vertex 1 Attributes
- 45. Attr 0 for Vertex 0 …… Attr 0 for Vertex 1 Attr 0 for Vertex 2 Attr 1 for Vertex 0 …… Attr 1 for Vertex 1 Attr 1 for Vertex 2 GL Driver Vertex Shader GL Driver Vertex Shader glDrawArraysglDrawArrays Data For all the vertices Uniforms Calculate Vertex 2 Attributes
- 46. glDrawElements() GL Driver Vertex Shader glDrawArrays Data For each vertex Attributes Data For all the vertices Uniforms 102101 …… Index Buffer 100 105 106 107 108 109 107 108 109
- 47. Attr 0 for Vertex 101 …… Attr 0 for Vertex 102 Attr 0 for Vertex 103 …… GL Driver Vertex Shader GL Driver Vertex Shader glDrawArraysglDrawArrays Data For all the vertices Uniforms Calculate Vertex 0 Attributes 102101 …… Index Buffer 100 105 106 107 108 109 107 108 109
- 49. Primitive Assembly points line strip line loop lines triangle strip triangle fan triangles Triangle Strip Triangle Fan
- 51. Clipping Clipping Viewport Rejection Back face Culling
- 54. Fragment Shading Using Interpolated value from VS out
- 55. Fragment ShadingTexture Blending Texture coordinate and another VS output
- 57. Texture - Mipmap
- 58. Shader View Vertex Shading Fragment ShadingTexture Vertex Data Input Pixel data Transformed Vertex Data Output Pixel Data
- 59. Vertex Shader Vertex Shading Vertices with raw data Vertices with calculated data
- 60. Shader Hardware 10 ~ 100 times more cores than CPU Large amount of vertices data Same control flow with less branch Data parallelism
- 62. Random Thought Visual cortex occupied lots volume of the brain. So does the GPU area in a mobile processor.