Shaders in Unity by Zoel

May 16, 20142 likes1,123 views

The document discusses shaders in Unity and graphics programming. Shaders are programs that run on the graphics processing unit (GPU) and are used for tasks like vertex manipulation, lighting effects, shadows, textures and more. There are different types of shaders that run at various stages of the graphics pipeline, including vertex shaders and fragment shaders. Historically shaders were written in low-level code, but languages like Cg, HLSL and GLSL allow writing them in a style similar to C using features like loops, conditionals and functions. Unity supports several approaches to writing shaders including surface, vertex-fragment and fixed-function styles. The document provides examples of simple shader code and techniques for setting uniforms to pass

@agatestudio
Shaders in Unity
Zoel
Knight
Agate Studio

Geometry Deformation.
Pixels processing.
Math intensive calculations.
GPGPU.

• D3D / OpenGL Render Pipeline Stages
Vertex Shader
Fragment Shader
Geometry ShaderTessellation
Primitive
Assembly
Rasterization
Raster
Operations
Pixels
Vertex
Assembly
Screen
Hull DomainTessellator Stage

• Runs per input vertex.
• Transform 3D into 2D (screen space) position.
• Can perform vertex position, color ,UV
(texture coordinates) manipulation.
• Cannot create new vertices.
• Cannot “see” other vertices.

• Runs per fragment.
• Computes fragment’s color.
• With fragment shader you can create: bump
mapping, shadows, lights, post processing
effects and other cool shit.
• See http://glsl.heroku.com/

Shaders before Cg/HLSL/GLSL:
TEX H0, f[TEX0], TEX4, 2D;
TEX H1, f[TEX2], TEX5, CUBE;
DP3X H1.xyz, H1, LUMINANCE;
MULX H0.w, H0.w, LUMINANCE.w;
MULX H1.w, H1.x, H1.x;
MOVH H2, f[TEX3].wxyz;
MULX H1.w, H1.x, H1.w;
DP3X H0.xyz, H2.xzyw, H0;
MULX H0.xyz, H0, H1.w;
TEX H1, f[TEX0], TEX1, 2D;
TEX H3, f[TEX0], TEX3, 2D;
MULX H0.xyz, H0, H3;
Bla… Bla… Bla…

CG Shader
• “C for graphics”
• High Level language.
Cg != C
• No classes, pointers, malloc , IO etc.
• Cg has loops, conditionals, functions/overloads.
• Member variables, local (temporary) variables constants.
• Data types: numeric primitives, vectors, matrices, arrays, structs,
and interfaces.
• Built-in trig and other math methods.
• Static & Dynamic compilation.

3 Ways of writing shaders in Unity:
Surface shaders.
Vertex and fragment shaders.
Fixed function shaders.

Passing vertex attributes and uniforms
• Programmable setup (via scripts):
- SetFloat()
- SetVector()
- SetMatrix()
- SetColor()
- SetBuffer()
- SetTexture()
• Shader lab properties:
[UniformName+(*“Uniform property panel name“+, *Data Type+) =
[Default value]

Accessing uniforms:
Very simple!!!
Declare uniforms in the shader header with exactly the same names and data
types as they have in Shader Lab prop block.

Thank you!!!
http://aras-p.info/blog/
http://docs.unity3d.com/Documentation/Manual/Shaders.html
http://http.developer.nvidia.com/CgTutorial/cg_tutorial_chapter01.html
https://developer.nvidia.com/shader-library
http://wiki.unity3d.com/index.php/Shaders
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Shaders in Unity by Zoel

1. @agatestudio Shaders in Unity Zoel Knight Agate Studio

4. Geometry Deformation. Pixels processing. Math intensive calculations. GPGPU.

5. • D3D / OpenGL Render Pipeline Stages Vertex Shader Fragment Shader Geometry ShaderTessellation Primitive Assembly Rasterization Raster Operations Pixels Vertex Assembly Screen Hull DomainTessellator Stage

7. • Runs per input vertex. • Transform 3D into 2D (screen space) position. • Can perform vertex position, color ,UV (texture coordinates) manipulation. • Cannot create new vertices. • Cannot “see” other vertices.

9. • Runs per fragment. • Computes fragment’s color. • With fragment shader you can create: bump mapping, shadows, lights, post processing effects and other cool shit. • See http://glsl.heroku.com/

11. Shaders before Cg/HLSL/GLSL: TEX H0, f[TEX0], TEX4, 2D; TEX H1, f[TEX2], TEX5, CUBE; DP3X H1.xyz, H1, LUMINANCE; MULX H0.w, H0.w, LUMINANCE.w; MULX H1.w, H1.x, H1.x; MOVH H2, f[TEX3].wxyz; MULX H1.w, H1.x, H1.w; DP3X H0.xyz, H2.xzyw, H0; MULX H0.xyz, H0, H1.w; TEX H1, f[TEX0], TEX1, 2D; TEX H3, f[TEX0], TEX3, 2D; MULX H0.xyz, H0, H3; Bla… Bla… Bla…

12. CG Shader • “C for graphics” • High Level language. Cg != C • No classes, pointers, malloc , IO etc. • Cg has loops, conditionals, functions/overloads. • Member variables, local (temporary) variables constants. • Data types: numeric primitives, vectors, matrices, arrays, structs, and interfaces. • Built-in trig and other math methods. • Static & Dynamic compilation.

13. Cg and Graphics APIs interop scheme:

15. 3 Ways of writing shaders in Unity: Surface shaders. Vertex and fragment shaders. Fixed function shaders.

16. Simple Custom shader:

17. Passing vertex attributes and uniforms • Programmable setup (via scripts): - SetFloat() - SetVector() - SetMatrix() - SetColor() - SetBuffer() - SetTexture() • Shader lab properties: [UniformName+(*“Uniform property panel name“+, *Data Type+) = [Default value]

18. Accessing uniforms: Very simple!!! Declare uniforms in the shader header with exactly the same names and data types as they have in Shader Lab prop block.

19. Thank you!!! http://aras-p.info/blog/ http://docs.unity3d.com/Documentation/Manual/Shaders.html http://http.developer.nvidia.com/CgTutorial/cg_tutorial_chapter01.html https://developer.nvidia.com/shader-library http://wiki.unity3d.com/index.php/Shaders [email protected]

Shaders in Unity by Zoel

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