University of Pennsylvania, CIS 565: GPU Programming and Architecture, Project 6
- Ziwei Zong
- Tested on: Google Chrome 46.0 on Mac 22, i7-2222 @ 2.22GHz 22GB, GTX 222 222MB (Personal)
Debug Views
| Depth | Position | Geometry Normal |
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| Texture Color | Normal Map | Surface Normal |
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Implemented post effects are bloom effect, toon shading and motion blur.
####Bloom Effect
Followed steps in GPU Gems 3, Ch. 27,first get the lighting source, blur it and then add it with original picture.
| Masked Source | Gaussian blurred source |
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####Toon Shading
####Motion Blur
Instead of rendering the full quad, scissor test allows it to render only a bounding box in the frame (as shown in the debug image above). The performance if almost three times faster after using scissor test, as shown below.
Using the method in [1] with a convolution widow of 7x7,first blur the masked source in X direction and then in Y direction. Though I haven't implement single pass method, I assume two-pass can improve the performance due to the reason that it total computs 7xres +7xres = 14res pixels while one-pass method computes 7x7xres = 49res pixels.
These two methods below are used to reduce the g-buffer size:
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Apply geometry normal and normal map in copy.frag: doing so directly reduces one g-buffer.
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Reduce normal size and pack them into position buffer and color buffer: only keep two elements in the normal vector, then put each of them into the pos.a and color.a relatively. The g-buffer size then reduced to only two. However, after reducing the normal size, there are some black spots on some surfaces.
- [1] Bloom: GPU Gems, Ch. 21 //* [2] Screen-Space Ambient Occlusion: // Floored Article
- [2] Post-Process Motion Blur: GPU Gems 3, Ch. 27