Shader Programming With Unity
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Shader programming is typically an esoteric technological area for those that have started off programming game clients using Unity. Since Unity abstracts out the graphics pipeline into an easy to use visual editor, we rarely delve into the inner workings of the programmable GPU
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Shader Programming With Unity
- 1. An Introduction to Shader Programming in Unity A MEF Training Presentation - 2016
- 3. Its Programmable Hardware! OpenGL API GLSL Programs Cg Programs (Nvidia) Khronos Group EGL API Vendor Specific Fixed Functions *Microsoft equivalent is DirectX and HLSL (Similar to Cg)
- 4. Well some parts are programmable & others can be configured with fixed function calls OpenGL API OpenGL Pipeline Vertex Buffer Objects Vertex Shader Primitive Assembly Rasterization Texture Memory Fragment Shader Fragment Operations Frame Buffer EGL API
- 5. Vertex Buffer Objects You store Vertex properties in these: Positions, Texture Coordinates, and so on… Op en GL Pip elin e
- 6. Vertex Shader You write a piece of code that can change those Vertex properties
- 7. Primitive Assembly Converts the Vertices into primitives and clips shapes that are out of the camera view Triangles Lines Points etc…
- 8. Rasterization Converts the primitives into Fragments (Unborn Pixels)
- 9. Texture Memory You upload Textures into the GPU memory. These are called Samplers.
- 10. Fragment Shader You write a piece of code that colors the fragments.
- 12. Recap… OpenGL API OpenGL Pipeline Vertex Buffer Objects Vertex Shader Primitive Assembly Rasterization Texture Memory Fragment Shader Fragment Operations Frame Buffer EGL API
- 13. Before we dive into code…
- 14. We must gain a basic understanding of the Model View Projection Matrix!
- 15. Models are created in ‘Model Space’ coordinates
- 16. But their coordinates transform when you put them in ‘World Space’
- 17. And coordinates transform once again when viewed through ‘Camera Space’
- 18. Finally the coordinates transform once more based on the ‘Projection’
- 19. Therefore EVERY vertex has to go through… Model Coordinates World Coordinates Camera Coordinates Projection Coordinates [Model Matrix] [View Matrix] [Projection Matrix]
- 20. For model vertices to become screen vertices, we must transform them via complex matrix multiplications… The bad news is that for OpenGL we have to calculate the MVP matrix manually…
- 21. But Unity makes it very very easy for us with a built in matrix variable we can use… UNITY_MATRIX_MVP
- 22. UNITY_MATRIX_MVP X Model Vertex Position = Screen Ready Position!
- 23. Unity makes programming graphics and shaders VERY easy…
- 24. In order to appreciate that, it is important to look at what it takes to render a cube if there was no Unity… Fire up Xcode on your MacBooks!
- 25. So Unity takes care of all this complexity plus gives us ShaderLab: Any easy interface to write shaders with… Op en GL Pip elin e Vertex Shader Fragment Shader ShaderLab Surface Shader
- 26. ShaderLab is a meta language that wraps around a Cg program Vertex Shader Fragment Shader ShaderLab Cg Code ShaderLab Code Surface Shader
- 27. A ‘Shader Program’ requires both a Vertex Shader + Fragment Shader Vertex Shader Fragment Shader+ = Shader Program
- 28. Shader Core Inputs & Outputs Vertex Shader Runs for each Vertex Fragment Shader Runs for each Fragment Vertices Fragments Colored FragmentsUniforms
- 29. Let’s get going with writing Shaders… Fire up Unity! The rest of this presentation is a hands-on shader writing workshop…