Add shading for shapes and the floor

shader/lighting/texture.frag

@@ -1,17 +1,24 @@
 #version 450 core
 uniform vec3 lightPos;
 uniform vec4 lumRad;
-uniform sampler2D screenTexture;
+layout (binding = 0) uniform sampler2D screenTexture;
+layout (binding = 1) uniform sampler2D normals;
 in vec2 vTexPos;
 out vec4 fColor;
 float rad = lumRad.a;
 void main() {
-  vec3 distVec = texture(screenTexture, vTexPos).xyz - lightPos;
+  vec3 pos = texture(screenTexture, vTexPos).xyz;
+  vec3 distVec = pos - lightPos;
+  vec4 normbit = texture(normals, vTexPos);
+  vec3 norm = normbit.xyz - pos;
+  float y1 = float(normbit.w == 0 ? 1 : dot(normalize(norm), normalize(distVec)));
+  float y = float(y1 > 0 ? 1 : 0);
+//  float y = float(normbit.w == 1 ? 1 : 0);
   float dist = dot(distVec, distVec);
   if (dist > rad) {
     discard;
   }
   float x = 1 - dist / rad;
-  vec3 c = (x * x * x) * lumRad.rgb;
+  vec3 c = y* (x * x * x) * lumRad.rgb;
   fColor = vec4(c, 0);
 }