diff --git a/shader/lighting/cap.vert b/shader/lighting/cap.vert
index c8440a6a1..e0ae04b6a 100644
--- a/shader/lighting/cap.vert
+++ b/shader/lighting/cap.vert
@@ -4,8 +4,6 @@ layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
 layout (std140, binding = 1) uniform TheLight { vec4 lightPos; vec4 lumRad; };
 layout (std430, binding = 3) readonly buffer Data { PosColNorm data[]; };
 layout (std430, binding = 4) readonly buffer Indices { uint indices[]; };
-//layout(location=0)uniform vec3 lightPos;
-//layout(location=1)uniform vec4 lumRad;
 vec4 projNear (vec4 pos)
 {
     // note we project to a specific height
diff --git a/shader/lighting/lineShadow.vert b/shader/lighting/lineShadow.vert
index c7d984be8..64bd706f7 100644
--- a/shader/lighting/lineShadow.vert
+++ b/shader/lighting/lineShadow.vert
@@ -57,6 +57,7 @@ void main()
   // test if the edge is part of the silhouette
   // that is, if the normals of the faces connected to the edge are in
   // "different directions" wrt the light direction
+  // (first test the "drawbit")
   if (p0.w==1 && dot(n0, lightDir) * dot(n1, lightDir) <= 0 &&
       (dot(lightDir, lightDir) < ru2 || dot(lightDir2, lightDir2) < ru2))
   // using <= rather than < seems to get rid of overlapping shadow
diff --git a/shader/lighting/texture.frag b/shader/lighting/texture.frag
index 8b9c5eede..f901f38ff 100644
--- a/shader/lighting/texture.frag
+++ b/shader/lighting/texture.frag
@@ -1,7 +1,6 @@
 #version 450 core
 layout(early_fragment_tests) in;
-layout(location=0)uniform vec3 lightPos;
-layout(location=1)uniform vec4 lumRad;
+layout (std140, binding = 1) uniform TheLight { vec4 lightPos; vec4 lumRad; };
 layout (binding = 0) uniform sampler2D screenTexture;
 layout (binding = 1) uniform sampler2D normals;
 in vec2 vTexPos;
@@ -9,18 +8,18 @@ out vec4 fColor;
 float rad = lumRad.a;
 void main() {
   vec3 pos = texture(screenTexture, vTexPos).xyz;
-  vec3 distVec = pos - lightPos;
+  vec3 distVec = pos - lightPos.xyz;
   float dist = dot(distVec, distVec);
-  if (dist > rad) {
-    discard;
-  }
-  vec4 normbit = texture(normals, vTexPos);
-  vec3 norm = normbit.xyz;
+//  if (dist > rad) {
+//    discard;
+//  }
+  vec3 norm = texture(normals, vTexPos).xyz;
   float y1 = dot(norm, distVec);
   float y2 = float(y1 > 0 ? 1 : 0);
   float x = 1 - (pow(dist / rad,4));
   //float x = 1 - (dist / rad);
   //float x = 1;
+  //float x = (dist > rad ? 0 : 1);
   vec3 c = y2* x * lumRad.rgb;
   fColor = vec4(c, 0);
 }
diff --git a/shader/lighting/texture.vert b/shader/lighting/texture.vert
index 51ba3304d..2672e2b06 100644
--- a/shader/lighting/texture.vert
+++ b/shader/lighting/texture.vert
@@ -1,9 +1,8 @@
 #version 450 core
-layout (location = 0) in vec2 pos;
-layout (location = 1) in vec2 texPos;
+layout (std140, binding = 2) uniform PosTex { vec4 posTex[6]; };
 out vec2 vTexPos;
 void main()
 {
-  gl_Position = vec4(pos,0,1);
-  vTexPos = texPos;
+  gl_Position = vec4(posTex[gl_VertexID].xy,0,1);
+  vTexPos = posTex[gl_VertexID].zw;
 }
diff --git a/src/Preload/Render.hs b/src/Preload/Render.hs
index 8f5efd5d1..87b147ae6 100644
--- a/src/Preload/Render.hs
+++ b/src/Preload/Render.hs
@@ -44,6 +44,12 @@ preloadRender = do
     glNamedBufferStorage lightubo 32 nullPtr GL_DYNAMIC_STORAGE_BIT
     glBindBufferBase GL_UNIFORM_BUFFER 1 lightubo
 
+    fulltexbo <- mglCreate glCreateBuffers
+    let ftsize = fromIntegral $ sizeOf (0::Float) * 6 * 4
+    withArray cornerList' $ \ptr ->
+        glNamedBufferStorage fulltexbo ftsize ptr 0
+    glBindBufferBase GL_UNIFORM_BUFFER 2 fulltexbo
+
     winssbo <- mglCreate glCreateBuffers
     let winssbosize = sizeOf (0 :: Float) * 8 * 1024
     glNamedBufferStorage winssbo (fromIntegral winssbosize) nullPtr GL_DYNAMIC_STORAGE_BIT
@@ -248,6 +254,16 @@ cornerList =
     , [1, 1, 1, 1]
     , [1, -1, 1, 0]
     ]
+cornerList' :: [Float]
+cornerList' = concat
+    [ bl, br, tl
+    , tl, br, tr
+    ]
+  where
+    bl = [-1, -1, 0, 0]
+    br = [ 1, -1, 1, 0]
+    tl = [-1,  1, 0, 1]
+    tr = [ 1,  1, 1, 1]
 
 --cornerListForTriangles :: [[Float]]
 --cornerListForTriangles =
diff --git a/src/Render.hs b/src/Render.hs
index 027650a13..2445727d8 100644
--- a/src/Render.hs
+++ b/src/Render.hs
@@ -201,13 +201,7 @@ renderShadows shadrendertype nWalls nSils nCaps positiontexture normaltexture li
         glColorMask GL_TRUE GL_TRUE GL_TRUE GL_FALSE
         glStencilFunc GL_EQUAL 0 255
         glUseProgram (ltextShad ^. shaderUINT)
-        glUniform3f 0 x y z
-        glUniform4f 1 r g b rad
-        glBindVertexArray $ ltextShad ^. shaderVAO . vaoName
-        glDrawArrays
-            (_unPrimitiveMode (_shaderPrimitive ltextShad))
-            0
-            (fromIntegral (4 :: Int))
+        glDrawArrays GL_TRIANGLES 0 6
     --cleanup: may not be necessary, depending on what comes after...
 --    glDisable GL_STENCIL_TEST
 --    glDisable GL_SCISSOR_TEST