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#version 150
uniform vec4 keyColour;
uniform float keyMinDist;
uniform float keyMaxDist;
uniform float time;
// these are our textures
uniform sampler2DRect backgroundTex;
uniform sampler2DRect foregroundTex;
// this comes from the vertex shader
in vec2 texCoordVarying1;
in vec2 texCoordVarying2;
// this is the output of the fragment shader
out vec4 outputColor;
void main()
{
// Get color values from the background and foreground
vec4 back = texture(backgroundTex, (texCoordVarying1 - 0.5) * time + (0.5 * time) );
vec4 fore = texture(foregroundTex, texCoordVarying1);
vec4 delta = fore - keyColour;
float distance2 = dot( delta, delta );
float weight = clamp( (distance2 - keyMinDist) / (keyMaxDist - keyMinDist), 0.0, 1.0);
//mix colors from background and foreground based on the mask value
outputColor = mix(back, fore, weight);
}
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