Live Webcam + Shader effects

potter3366

I want to create an application which basically captures a webcam feed and applies a custom shader effect (GLSL) on it. Capture finds device, but only get black screen. On the other hand I can apply this shader effect to still image... Any help would be greatly appreciated..

processing

import processing.video.*;

Capture cam;
PImage still;
int w = 640;
int h = 480;
PShader shade;

void setup() {
  size(w, h, P2D);
  cam = new Capture(this, w, h);
  cam.start();
  still = createImage(w, h, RGB);
  //still = loadImage("test.jpg");
  shade = loadShader("sepia.glsl");
  shade.set("image", still);
}

void draw() {
  shader(shade);
  if (cam.available()) {
    cam.read();
  }
  still = cam.get();
  image(still, 0, 0);
}

GLSL

#ifdef GL_ES
precision mediump float;
precision mediump int;
#endif

#define PROCESSING_TEXTURE_SHADER

uniform sampler2D image;
varying vec4 vertTexCoord;

void main() {
  vec4 texel = texture2D(image, vertTexCoord.st);
  gl_FragColor = vec4(texel.x,texel.y,texel.z, 1.0);
  gl_FragColor.r = dot(texel, vec3(.393, .769, .189));
  gl_FragColor.g = dot(texel, vec3(.349, .686, .168));
  gl_FragColor.b = dot(texel, vec3(.272, .534, .131));  
}

potter3366

I solved it in processing 1.5.1 (GLGraphics library) with "texSrc.putPixelsIntoTexture()".

"Everybody be cool, this is a processing robbery!"

You can temporarily stop and resume "security" webcam with mouse click. Fim grain and sepia shaders are applied to texSrc texture..

https://dl.dropboxusercontent.com/u/70391886/ROBBERY.zip

btw, is there any other way to copy one texture to another?

texSrc.loadPixels();
texSrc.updateTexture();
texDest.loadPixels();
texDest.updateTexture();
for (int i=0; i<texSrc.pixels.length; i++) {
  texDest.pixels[i] = texSrc.pixels[i];
}
texSrc.loadTexture();
texSrc.updatePixels();
texDest.loadTexture();
texDest.updatePixels();

GoToLoop

Utility function arrayCopy() is internally optimized and faster than a loop copy:
http://processing.org/reference/arrayCopy_.html

arrayCopy(textScr, textDest);