Last change
on this file since 7152 was
5312,
checked in by landauf, 16 years ago
|
added shaders (compositors, materials, cg programs and textures)
|
-
Property svn:eol-style set to
native
|
File size:
800 bytes
|
Line | |
---|
1 | sampler Image : register(s0); |
---|
2 | |
---|
3 | // The Laplace filter approximates the second order derivate, |
---|
4 | // that is, the rate of change of slope in the image. It can be |
---|
5 | // used for edge detection. The Laplace filter gives negative |
---|
6 | // response on the higher side of the edge and positive response |
---|
7 | // on the lower side. |
---|
8 | |
---|
9 | // This is the filter kernel: |
---|
10 | // 0 1 0 |
---|
11 | // 1 -4 1 |
---|
12 | // 0 1 0 |
---|
13 | |
---|
14 | |
---|
15 | |
---|
16 | float4 Laplace_ps (float2 texCoord: TEXCOORD0, |
---|
17 | uniform float scale, |
---|
18 | uniform float pixelSize) : COLOR |
---|
19 | { |
---|
20 | |
---|
21 | float2 samples[4] = { |
---|
22 | 0, -1, |
---|
23 | -1, 0, |
---|
24 | 1, 0, |
---|
25 | 0, 1 |
---|
26 | }; |
---|
27 | float4 laplace = -4 * tex2D(Image, texCoord); |
---|
28 | |
---|
29 | // Sample the neighbor pixels |
---|
30 | for (int i = 0; i < 4; i++){ |
---|
31 | laplace += tex2D(Image, texCoord + pixelSize * samples[i]); |
---|
32 | } |
---|
33 | |
---|
34 | return (0.5 + scale * laplace); |
---|
35 | } |
---|
36 | |
---|
Note: See
TracBrowser
for help on using the repository browser.