First pass implementing exponentially fading lighting

shader/fadeCircle.frag

@@ -1,12 +1,15 @@
 #version 430 core
-in vec4 gColor;
-in vec2 cenPosTrans;
-in float gRad;
+in vec2 cenPosT;
+in vec2 gParams;
 out vec4 fColor;
 
 void main()
 {
   vec2 pos = gl_FragCoord.xy;
-  float dist = max(0 , 1 - 2 * distance(pos,cenPosTrans) / (gRad));
-  fColor = vec4( gColor.xyz , pow(gColor.z*dist,2) );
+  float dist = min(1 , 2*distance(pos,cenPosT) / (gParams.x));
+  //float c = pow(gParams.y*dist,2);
+  float c = pow(1-dist,2);
+  fColor = vec4( c,c,c ,c  );
+//  fColor = vec4( 1,0,0 ,  1);
+//  fColor = vec4( 1,0,0 , pow(dist,2) );
 }

shader/fadeCircle.geom

@@ -1,30 +1,39 @@
 #version 430 core
 layout (points) in;
 layout (triangle_strip, max_vertices = 4) out;
-in vec4 vColor [];
-in float vRad [];
+in vec2 vParams [];
+out vec2 gParams;
+out vec2 cenPosT;
+
 uniform vec2 winSize;
-out vec4 gColor;
-out float gRad;
-out vec2 cenPosTrans;
+uniform float zoom;
+
 void main()
 {
   vec3 cenPos = gl_in[0].gl_Position.xyz;
-  vec2 cenPosa = cenPos.xy + vec2 (1,1);
-  cenPosTrans = vec2 (cenPosa * winSize * 0.5);
-  gColor = vColor[0];
-  gRad = vRad[0];
+  //cenPos = vec3 (0.5,0,0);
+  gParams = vec2( vParams[0].x * zoom * 2, vParams[0].y);
+  float gRad = gParams.x;
 
-  gl_Position = vec4 (cenPos.x + gRad/winSize.x, cenPos.y + gRad/winSize.y, cenPos.z , 1);
+  cenPosT = vec2 ( (cenPos.x + 1) * 0.5 * winSize.x , (cenPos.y + 1) * 0.5 * winSize.y);
+
+  gl_Position = vec4 (cenPos.x + gRad/winSize.x, cenPos.y + gRad/winSize.y, 0.9 , 1);
   EmitVertex();
-  gl_Position = vec4 (cenPos.x - gRad/winSize.x, cenPos.y + gRad/winSize.y, cenPos.z , 1);
+  gl_Position = vec4 (cenPos.x - gRad/winSize.x, cenPos.y + gRad/winSize.y, 0.9 , 1);
   EmitVertex();
-  gl_Position = vec4 (cenPos.x + gRad/winSize.x, cenPos.y - gRad/winSize.y, cenPos.z , 1);
+  gl_Position = vec4 (cenPos.x + gRad/winSize.x, cenPos.y - gRad/winSize.y, 0.9 , 1);
   EmitVertex();
-  gl_Position = vec4 (cenPos.x - gRad/winSize.x, cenPos.y - gRad/winSize.y, cenPos.z , 1);
+  gl_Position = vec4 (cenPos.x - gRad/winSize.x, cenPos.y - gRad/winSize.y, 0.9 , 1);
   EmitVertex();
 
+//  gl_Position = vec4 (0.5,0.5,0 , 1);
+//  EmitVertex();
+//  gl_Position = vec4 (0,0.5,0 , 1);
+//  EmitVertex();
+//  gl_Position = vec4 (0.5,0,0 , 1);
+//  EmitVertex();
+//  gl_Position = vec4 (0,0,0 , 1);
+//  EmitVertex();
 
   EndPrimitive();
-
 }

shader/fadeCircle.vert

@@ -1,12 +1,8 @@
 #version 430 core
-layout (location = 0) in vec3 position;
-layout (location = 1) in vec4 color;
-layout (location = 2) in float rad;
-out vec4 vColor;
-out float vRad;
+layout (location = 0) in vec4 position;
+out vec2 vParams;
 void main()
 {
-  gl_Position = vec4(position,1);
-  vColor = color;
-  vRad = rad;
+  gl_Position = vec4(position.xy,0,1);
+  vParams = position.zw;
 }

shader/wallShadow.frag

@@ -3,5 +3,5 @@ out vec4 fColor;
 
 void main()
 {
-  fColor = vec4 (0.9,0.5,0,1);
+  fColor = vec4 (0.9,0.5,0,0);
 }

shader/wallShadow.geom

@@ -1,6 +1,6 @@
 #version 430 core
 layout (points) in;
-layout (triangle_strip, max_vertices = 4) out;
+layout (triangle_strip, max_vertices = 10) out;
 
 in vec4 vBackPoss[];
 uniform vec2 lightPos;
@@ -12,13 +12,25 @@ void main()
   vec2 posc = vBackPoss[0].xy;
   vec2 posd = vBackPoss[0].zw;
 
-  gl_Position = vec4 (posa, -1 , 1);
+  gl_Position = vec4 (posa, 0 , 1);
   EmitVertex();
-  gl_Position = vec4 (posb, -1 , 1);
+  gl_Position = vec4 (posa + (200 * (posa - lightPos)), 0 , 1);
   EmitVertex();
-  gl_Position = vec4 (posc, -1 , 1);
+  gl_Position = vec4 (posb, 0 , 1);
   EmitVertex();
-  gl_Position = vec4 (posd, -1 , 1);
+  gl_Position = vec4 (posb + (200 * (posb - lightPos)), 0 , 1);
+  EmitVertex();
+  gl_Position = vec4 (posb + (200 * (posb - lightPos)), 0 , 1);
+  EmitVertex();
+  gl_Position = vec4 (posd, 0 , 1);
+  EmitVertex();
+  gl_Position = vec4 (posd, 0 , 1);
+  EmitVertex();
+  gl_Position = vec4 (posd + (200 * (posd - lightPos)), 0 , 1);
+  EmitVertex();
+  gl_Position = vec4 (posc, 0 , 1);
+  EmitVertex();
+  gl_Position = vec4 (posc + (200 * (posc - lightPos)), 0 , 1);
   EmitVertex();
 
   EndPrimitive();