Draw walls using vertex pulling

shader/pull/wall.frag

@@ -0,0 +1,19 @@
+#version 450 core
+layout (location=0) out vec4 fCol;
+layout (location=1) out vec4 fPos;
+layout (location=2) out vec4 fNorm;
+in vec3 vTexCoords;
+in vec4 vPos;
+in float vAng;
+layout (binding=40) uniform sampler2DArray diffuseSampler;
+layout (binding=41) uniform sampler2DArray normalSampler;
+vec2 rotateV2 (float a, vec2 v)
+{ return vec2(v.x*cos(a) - v.y*sin(a), v.x*sin(a) + v.y*cos(a)); }
+void main()
+{
+  fCol = texture(diffuseSampler,vTexCoords);
+  fPos = vPos;
+  vec4 basenorm = texture(normalSampler,vTexCoords) - 0.5;
+  vec2 n1 = rotateV2(vAng,vec2(basenorm.x,basenorm.z));
+  fNorm = vec4(-vec3(n1,basenorm.y),0);
+}