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Wednesday, June 1st 2016, 7:43pm
Yes - you could use that example as base - look at the WebGL fragment shader code there - there you can easily change/process the color values.I found the thread about WebGL createPostProcessingShader where Klaus mentions (and gives hints about) the upcoming sharpening filter, would that be the way to go? And is there a working example available?
WebGL createPostProcessingShader returns null
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Source code |
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"precision mediump float;"+
"uniform sampler2D sm;"+ // sm = the screen as input texture sampler
"uniform float brightness;"+ // a custom uniform
"uniform float contrast;"+ // a custom uniform
"uniform float gamma;"+ // a custom uniform
"varying vec2 tx;"+ // tx = the texture coordinates (0.0,0.0 to 1.0,1.0)
"void main()"+
"{"+
"vec4 color = texture2D(sm,vec2(tx.x, tx.y));"+
"vec4 newcolor = vec4(0.0, 0.0, 0.0, 1.0);"+
"newcolor.r = (pow(color.r,gamma) - 0.5)*contrast + brightness + 0.5;"+
"newcolor.g = (pow(color.g,gamma) - 0.5)*contrast + brightness + 0.5;"+
"newcolor.b = (pow(color.b,gamma) - 0.5)*contrast + brightness + 0.5;"+
"gl_FragColor = newcolor;"+
"}";
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User-Plugins »
imageadjust plugin
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Plugins » adjust brightness button
(Jul 13th 2009, 4:40am)
Thursday, September 21st 2023, 9:53am
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