Irrlicht Engine

Code: Select all

 
uniform sampler2D textureSampler;
uniform sampler2D ShadowMapSampler;
uniform vec4 LightColour;
varying float lightVal;
 
float testShadow(vec2 smTexCoord, vec2 offset, float realDistance)
{
    vec4 texDepth = texture2D(ShadowMapSampler, vec2( smTexCoord + offset));
    float extractedDistance = texDepth.r;
    
    return (extractedDistance <= realDistance) ? (1.0  / 8.0) : 0.0; 
}
 
vec2 offsetArray[8];
 
void main() 
{
  vec4 TPos = gl_TexCoord[0];
    vec4 SMPos = gl_TexCoord[1];
    vec4 MVar = gl_TexCoord[2];
 
    offsetArray[0] = vec2(0.0, 0.0);
    offsetArray[1] = vec2(0.0, 1.0);
    offsetArray[2] = vec2(1.0, 1.0);
    offsetArray[3] = vec2(-1.0, -1.0);
    offsetArray[4] = vec2(-2.0, -1.0);
    offsetArray[5] = vec2( 2.0, -1.0);
    offsetArray[6] = vec2(-2.0,  1.0);
    offsetArray[7] = vec2(-2.0,  1.0);
 
  SMPos.xy  = SMPos.xy / SMPos.w / 2.0 + vec2(0.5, 0.5);
 
  vec4 finalCol = vec4(0.0, 0.0, 0.0, 0.0);
 
    // If this point is within the light's frustum.
    vec2 clampedSMPos = clamp(SMPos.xy, vec2(0.0, 0.0), vec2(1.0, 1.0));
    if(clampedSMPos.x == SMPos.x && clampedSMPos.y == SMPos.y && SMPos.z > 0.0 && SMPos.z < MVar.z)
    {
        float lightFactor = 1.0;
        float realDist = MVar.x / MVar.z - 0.002;
    
      for(int i = 0;i < 8; i++)
            lightFactor -= 2.5 * testShadow(SMPos.xy, offsetArray[i] * MVar.w, realDist);
 
  if (lightFactor < 0.05) lightFactor = 0.05;
        // Multiply with diffuse.
     if (MVar.y > 0.25)
            finalCol = lightFactor * MVar.y;
     else
       finalCol = MVar.y;
    }
  else finalCol = 0.25;
 
    gl_FragColor = texture2D(textureSampler, TPos.xy) * finalCol;
}