Move towards geometry instancing for shadows

shader/shadow/light.frag

@@ -0,0 +1,20 @@
+#version 450 core
+layout (std140, binding = 1) uniform LightsBlock
+{
+    vec4 posBool[20];
+    vec4 colRad[20];
+} ;
+uniform vec3 lightPos;
+uniform vec4 lumRad;
+uniform sampler2D screenTexture;
+in vec2 vTexPos;
+out vec4 fColor;
+void main()
+{
+    vec3 distVec = texture(screenTexture,vTexPos).xyz - lightPos;
+    float dist = dot(distVec,distVec);
+    if (dist > lumRad.a) {discard;}
+    float x = 1 - dist / lumRad.a ;
+    vec3 c = (x * x * x) * lumRad.rgb ;
+    fColor = vec4(c,0);
+}