brightness and contrast 2d filter?

Game Engine Game Engine Support and Discussion
1

Anyone knows about a brightness and contrast 2d filter?
thanks!

2

Code to brighten/darken, controlled by the value of float brightness

uniform sampler2D bgl_RenderedTexture;
void main(void)
{
  float brightness = .2;
  vec4 texcolor = texture2D(bgl_RenderedTexture, gl_TexCoord[0].st);
  vec3 bright = texcolor.rbg + vec3(brightness,brightness,brightness);
  gl_FragColor = vec4(bright[0],bright[1],bright[2], texcolor.a);
}

Code to change contrast (have to be a non-negative value), controlled by the value of float contrast

uniform sampler2D bgl_RenderedTexture;
void main(void)
{
  float contrast = 1.5;
  vec4 texcolor = texture2D(bgl_RenderedTexture, gl_TexCoord[0].st);
  vec3 contrasted = (texcolor.rbg - 0.5) * contrast + 0.5;
  gl_FragColor = vec4(contrasted[0], contrasted[1], contrasted[2],texcolor.a);
}

put them in the text editor and apply them as custom filter.

3

Hey, really thanks for that, haha, this ll be very usefull for me.
Very cool!

4

You can of course use objects properties to control it if you like that instead of a hardcoded value.