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Post-processing Effects ⇨ May need to access many neighbor texels in the fragment shader Can calculate these coordinates in the fragment shader, but this uses valuable instructions Instead use all of the available varying slots and precalculate offset coordinates in the vertex shader Query GL_MAX_VARYING_FLOATS to determine how many slots are available 20-May-2009 © Copyright Ian D. Romanick 2009
Post-processing Effects ⇨ Offset texel locations can also be accessed with textureOffset and friends vec4 textureOffset(sampler2D s, vec2 p, ivec2 offset); Integer offset must be known at compile time Requires GLSL 1.30. Available with EXT_gpu_shader4 as texture2DOffset, texture2DRectOffset, etc. 20-May-2009 © Copyright Ian D. Romanick 2009
Page 1 and 2: VGP352 - Week 7 ⇨ Agenda: Text
Page 3 and 4: Texture Rectangle ⇨ Added feature
Page 5 and 6: Post-processing Effects ⇨ Overvie
Page 7: Post-processing Effects ⇨ Draw tw
Page 11 and 12: Filter Kernels ⇨ Uniform blur ove
Page 13 and 14: Filter Kernels - Edge Detection ⇨
Page 19 and 20: Sobel Edge Detection ⇨ Uses two f
Page 21 and 22: Sobel Edge Detection Images from ht
Page 23 and 24: Filter Kernels ⇨ Implement this e
Page 25 and 26: Filter Kernels ⇨ Implement this e
Page 27 and 28: Separable Filter Kernels ⇨ 2D ker
Page 29 and 30: Separable Filter Kernels ⇨ The 2D
Page 31 and 32: Separable Filter Kernels ⇨ Implem
Page 33 and 34: References http://www.archive.org/d
Page 35 and 36: Depth-of-field ⇨ Basic optics:
Page 37 and 38: Depth-of-field ⇨ In most real-tim
Page 39 and 40: Depth-of-field ⇨ In most real-tim
Page 41 and 42: Depth-of-field ⇨ Problem with thi
Page 43 and 44: Depth-of-field ⇨ Simplified GPU i
Page 45 and 46: Depth-of-field ⇨ Simplified GPU i
Page 47 and 48: Next week... ⇨ Beyond bumpmaps:

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