1. Lecture 9 --- Rendering pipeline, shaders and effects 1Elias Holmlid

2.  First part:  The rendering pipeline  Effects & shaders overview  XNA, HLSL & Effects  Shader authoring tools  Particle Systems  Second part  Effect, texturing and particle system example Elias Holmlid2

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4.  Rasterization  Taking vertex positions from the vertex shader and transforming them into pixels. Elias Holmlid4

5.  Transform and shading of geometry  Particles: motion + shading  Intermediate buffers (textures)  Post processing Elias Holmlid5

6.  Texture Elias Holmlid6

7.  Texture +  Directional light Elias Holmlid7

8.  Texture +  Directional light +  Spotlight Elias Holmlid8

9.  Texture +  Directional light +  Spotlight +  Normal map Elias Holmlid9

10.  Texture +  Directional light +  Spotlight +  Normal map +  Pointlight Elias Holmlid10

11.  Texture +  Directional light +  Spotlight +  Normal map +  Pointlight +  Shadows Elias Holmlid11

12. Elias Holmlid12  Example: Heat texture

13. Elias Holmlid13  Example: Soft shadows

14. Bloom disabledBloom enabled Elias Holmlid14

15.  C-like syntax  No object orientation  Functions can be used  By using include-files, functions and datatypes can be reused Elias Holmlid15

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18.  Vertex shader  Used to transform vertices ▪ Solids deforming ▪ Skeletal animation ▪ Particle motion Elias Holmlid18

19.  Pixel shader  Manipulates pixel color and optionally the pixel depth.  Examples: ▪ Lighting ▪ Contrast ▪ Blur Elias Holmlid19

20.  Easy to work with in XNA  Represented by the class Effect  Effect effect;  effect.Load (”/effects/lightEffect”);  You can then set the attributes of the effect  effect.Parameters[”lightPosition”].SetValue()  To make the code more robust and efficient, implement a helper class for each effect.  After a while, you may want to find a faster way of adding new shaders Elias Holmlid20

21.  Complete IDE´s available for developing shaders Elias Holmlid21

22.  A way to simulate explosions, water, fire etc.  Particles behave in a similar, yet slightly different way Elias Holmlid22

23.  Particles created and killed on the CPU  Custom vertex declaration used  Pooling should be used (no memory allocation during runtime)  Current position/color/size of each particle calculated in vertex shader  Final color decided in pixel shader Elias Holmlid23