diff --git a/crt/crt-geom-deluxe.slangp b/crt/crt-geom-deluxe.slangp
index 9a145ee..77dc897 100644
--- a/crt/crt-geom-deluxe.slangp
+++ b/crt/crt-geom-deluxe.slangp
@@ -17,13 +17,14 @@ alias3 = blur
 shader4 = shaders/geom-deluxe/crt-geom-deluxe.slang
 filter_linear4 = true
 
-textures = "aperture;slot;delta"
-delta = shaders/geom-deluxe/masks/delta_2_4x1_rgb.png
-delta_filter_linear = true
-delta_repeat_mode = repeat
-slot = shaders/geom-deluxe/masks/slot_2_5x4_bgr.png
-slot_filter_linear = true
-slot_repeat_mode = repeat
-aperture = shaders/geom-deluxe/masks/aperture_2_4_rgb.png
-aperture_filter_linear = true
-aperture_repeat_mode = repeat
\ No newline at end of file
+# comment these mask textures since we're generating them in the shader
+#textures = "aperture;slot;delta"
+#delta = shaders/geom-deluxe/masks/delta_2_4x1_rgb.png
+#delta_filter_linear = true
+#delta_repeat_mode = repeat
+#slot = shaders/geom-deluxe/masks/slot_2_5x4_bgr.png
+#slot_filter_linear = true
+#slot_repeat_mode = repeat
+#aperture = shaders/geom-deluxe/masks/aperture_2_4_rgb.png
+#aperture_filter_linear = true
+#aperture_repeat_mode = repeat
diff --git a/crt/shaders/geom-deluxe/crt-geom-deluxe.slang b/crt/shaders/geom-deluxe/crt-geom-deluxe.slang
index 7d8d6c7..89b17bc 100644
--- a/crt/shaders/geom-deluxe/crt-geom-deluxe.slang
+++ b/crt/shaders/geom-deluxe/crt-geom-deluxe.slang
@@ -12,6 +12,8 @@
  
 #include "geom-deluxe-params.inc"
 
+#include "../../../include/subpixel_masks.h"
+
 #define u_tex_size0 global.SourceSize
 #define u_tex_size1 global.internal1Size
 #define u_quad_dims global.OutputSize
@@ -117,9 +119,10 @@ layout(location = 4) in vec2 v_one;
 layout(location = 0) out vec4 FragColor;
 layout(set = 0, binding = 2) uniform sampler2D blur;
 layout(set = 0, binding = 3) uniform sampler2D internal1;
-layout(set = 0, binding = 4) uniform sampler2D aperture;
-layout(set = 0, binding = 5) uniform sampler2D slot;
-layout(set = 0, binding = 6) uniform sampler2D delta;
+// comment these out, as we're using generated masks instead of LUTs
+//layout(set = 0, binding = 4) uniform sampler2D aperture;
+//layout(set = 0, binding = 5) uniform sampler2D slot;
+//layout(set = 0, binding = 6) uniform sampler2D delta;
 
 #define blur_texture blur
 
@@ -301,23 +304,10 @@ void main()
   // original code; just makes a giant phosphor here
   // xy = v_texCoord.xy * u_quad_dims.xy / u_tex_size1.xy;
   
-  // tiling; looks nasty at non-integer x and/or y
-  // xy = fract(v_texCoord * global.SourceSize.xy * 1.9999);
-  
   // gl_FragCoord; tied to physical pixel size
   xy = v_texCoord.xy * global.OutputSize.xy;
-  
-  //vec3 mask = texture(mask_texture, xy).rgb;
-  vec3 mask = vec3(1.0);
-  if(mask_picker == 0) // no mask
-  {
-   FragColor = vec4(mul_res, col.a);
-   return;
-  }
-  else if(mask_picker == 1) mask = texture(aperture, xy * 0.3333).rgb;
-  else if(mask_picker == 2) mask = texture(slot, xy * 0.25).rgb;
-  else mask = texture(delta, xy * 0.49999).rgb;
-  mask = mix(vec3(1.0), mask, aperture_strength.x);
+
+  vec3 mask = mask_weights(xy, aperture_strength.x, mask_picker);
   
   FragColor = vec4(mul_res*mask, col.a);
-}
\ No newline at end of file
+}
diff --git a/crt/shaders/geom-deluxe/geom-deluxe-params.inc b/crt/shaders/geom-deluxe/geom-deluxe-params.inc
index ceb0ffa..8dc2181 100644
--- a/crt/shaders/geom-deluxe/geom-deluxe-params.inc
+++ b/crt/shaders/geom-deluxe/geom-deluxe-params.inc
@@ -16,7 +16,7 @@ layout(std140, set = 0, binding = 0) uniform UBO
 	mat4 MVP;
 } global;
 
-#pragma parameter mask_type "Mask (none, aperture, slot, delta)" 1.0 0.0 3.0 1.0
+#pragma parameter mask_type "Mask (aperture, delta, slot)" 1.0 1.0 19.0 1.0
 #pragma parameter aperture_strength "Shadow mask strength" 0.4 0.0 1.0 0.05
 #pragma parameter phosphor_power "Phosphor decay power" 1.2 0.5 3.0 0.05
 #pragma parameter phosphor_amplitude "Phosphor persistence amplitude" 0.04 0.0 0.2 0.01
@@ -52,4 +52,4 @@ vec2 angle = vec2(params.angle_x, params.angle_y);
 vec2 overscan = vec2(params.overscan_x, params.overscan_y);
 int mask_picker = int(params.mask_type);
 
-const float gamma = 2.2;
\ No newline at end of file
+const float gamma = 2.2;