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![Therefore EVERY vertex has
to go through…
Model Coordinates
World Coordinates
Camera Coordinates
Projection Coordinates
[Model Matrix]
[View Matrix]
[Projection Matrix]](https://image.slidesharecdn.com/helloshader-160622091749/85/Shader-Programming-With-Unity-19-320.jpg)
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Shader Programming With Unity
This document is a training presentation on shader programming in Unity, covering the basics of graphics hardware and the OpenGL pipeline, including vertex buffers, shaders, and matrix transformations. It explains how Unity simplifies the complexities of graphics programming through built-in variables and ShaderLab, making shader writing accessible. The presentation also includes a hands-on workshop for writing shaders in Unity.
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Similar to Shader Programming With Unity
Shader Programming With Unity
- 1. An Introduction to ShaderProgramming in Unity A MEF Training Presentation - 2016
- 2.
- 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 partsare 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 Youstore Vertex properties in these: Positions, Texture Coordinates, and so on… Op en GL Pip elin e
- 6. Vertex Shader You writea piece of code that can change those Vertex properties
- 7. Primitive Assembly Converts theVertices into primitives and clips shapes that are out of the camera view Triangles Lines Points etc…
- 8. Rasterization Converts the primitives intoFragments (Unborn Pixels)
- 9. Texture Memory You uploadTextures into the GPU memory. These are called Samplers.
- 10. Fragment Shader You writea piece of code that colors the fragments.
- 11.
- 12.
- 13. Before we diveinto code…
- 14. We must gaina basic understanding of the Model View Projection Matrix!
- 15. Models are createdin ‘Model Space’ coordinates
- 16. But their coordinatestransform when you put them in ‘World Space’
- 17. And coordinates transformonce again when viewed through ‘Camera Space’
- 18. Finally the coordinatestransform once more based on the ‘Projection’
- 19. Therefore EVERY vertexhas to go through… Model Coordinates World Coordinates Camera Coordinates Projection Coordinates [Model Matrix] [View Matrix] [Projection Matrix]
- 20. For model verticesto 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 makesit 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 = ScreenReady Position!
- 23. Unity makes programming graphicsand shaders VERY easy…
- 24. In order toappreciate 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 takescare 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 ameta 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 goingwith writing Shaders… Fire up Unity! The rest of this presentation is a hands-on shader writing workshop…