#version 120

const int max_lights = 4;

uniform mat4 InvViewMat;
uniform mat4 TexGenMats[max_lights];      //Texturprojektionsmatrix, ist die gleiche Matrix wie für meine Lichtproj.

varying vec4 shadowCoord[max_lights];
varying vec4 shadowCoordWdiv[max_lights];

void main()
{   
 vec4 posEye =  gl_ModelViewMatrix * gl_Vertex;
 vec4 posWorld = InvViewMat * posEye; 
 
   for (int i=0; i < max_lights; ++i) { 
     shadowCoord[i] = TexGenMats[i] * posWorld;    
      shadowCoordWdiv[i] = shadowCoord[i] / shadowCoord[i].w;
      shadowCoordWdiv[i].z += 0.0005;
   }      
 
   gl_TexCoord[0] = gl_MultiTexCoord0;     
   gl_Position = ftransform();      
}

#version 120

const int max_lights = 4;

uniform sampler2D shadowMaps0;
uniform sampler2D shadowMaps1;
uniform sampler2D shadowMaps2;
uniform sampler2D shadowMaps3;
uniform sampler2D Texture0;

varying vec4 shadowCoord[max_lights];
varying vec4 shadowCoordWdiv[max_lights];

void main (void)
{
 //Shadowmapping
 
 vec4 OutputColor = vec4(1.0, 1.0, 1.0, 1.0);
 float distanceFromLight[max_lights];
 
 distanceFromLight[0] = texture2D(shadowMaps1, shadowCoordWdiv[0].st).z;
 distanceFromLight[1] = texture2D(shadowMaps1, shadowCoordWdiv[1].st).z;
 distanceFromLight[2] = texture2D(shadowMaps2, shadowCoordWdiv[2].st).z;
 distanceFromLight[3] = texture2D(shadowMaps3, shadowCoordWdiv[3].st).z;

 float shadow = 1.0;
   for (int i=0; i < max_lights; ++i)  {
     if (shadowCoord[i].w > 0.0)
     shadow = distanceFromLight[i] < shadowCoordWdiv[i].z ? 0.5 : 1.0;
    OutputColor *= shadow;
   }
   gl_FragColor = OutputColor ;
}