Implement low res shadows

shader/lighting/floor.frag

@@ -1,5 +1,4 @@
 #version 430 core
-in vec2 cenPosT;
 in float lum;
 
 in vec2 dField;

shader/lighting/floor.geom

@@ -1,33 +1,34 @@
 #version 430 core
 layout (points) in;
 layout (triangle_strip, max_vertices = 4) out;
-in vec2 vParams [];
 out float lum;
-out vec2 cenPosT;
 out vec2 dField;
 
 uniform vec2 winSize;
 uniform float zoom;
+uniform mat4 worldMat;
 
 void main()
 {
-  lum = vParams[0].y;
-  vec3 cenPos = gl_in[0].gl_Position.xyz;
-  float gRad = vParams[0].x * zoom * 2;
-
-  cenPosT = vec2 ( (cenPos.x + 1) * 0.5 * winSize.x , (cenPos.y + 1) * 0.5 * winSize.y);
+  lum = gl_in[0].gl_Position.w;
+  vec2 cenPos = vec2( gl_in[0].gl_Position.x / 2, gl_in[0].gl_Position.y / 2);
+  float gRad = gl_in[0].gl_Position.z * zoom * 2;
 
   dField = vec2 ( 1, 1);
-  gl_Position = vec4 (cenPos.x + gRad/winSize.x, cenPos.y + gRad/winSize.y, -0 , 1);
+  gl_Position 
+      = vec4 (cenPos.x + gRad/winSize.x, cenPos.y + gRad/winSize.y, -0 , 1);
   EmitVertex();
   dField = vec2 (-1, 1);
-  gl_Position = vec4 (cenPos.x - gRad/winSize.x, cenPos.y + gRad/winSize.y, -0 , 1);
+  gl_Position 
+      = vec4 (cenPos.x - gRad/winSize.x, cenPos.y + gRad/winSize.y, -0 , 1);
   EmitVertex();
   dField = vec2 ( 1,-1);
-  gl_Position = vec4 (cenPos.x + gRad/winSize.x, cenPos.y - gRad/winSize.y, -0 , 1);
+  gl_Position 
+      = vec4 (cenPos.x + gRad/winSize.x, cenPos.y - gRad/winSize.y, -0 , 1);
   EmitVertex();
   dField = vec2 (-1,-1);
-  gl_Position = vec4 (cenPos.x - gRad/winSize.x, cenPos.y - gRad/winSize.y, -0 , 1);
+  gl_Position 
+      = vec4 (cenPos.x - gRad/winSize.x, cenPos.y - gRad/winSize.y, -0 , 1);
   EmitVertex();
 
   EndPrimitive();

shader/lighting/floor.vert

@@ -1,6 +1,6 @@
 #version 430 core
 layout (location = 0) in vec4 position;
-out vec2 vParams;
+//out vec2 vParams;
 
 uniform vec2 winSize;
 uniform float zoom;
@@ -10,6 +10,5 @@ uniform mat4 worldMat;
 
 void main()
 {
-  gl_Position = vec4(position.xy,0,1);
-  vParams = position.zw;
+  gl_Position = position;
 }