diff --git a/Shaders/AAOmniScaleLegacy.fsh b/Shaders/AAOmniScaleLegacy.fsh
index 5bfddb91..b84e2ced 100644
--- a/Shaders/AAOmniScaleLegacy.fsh
+++ b/Shaders/AAOmniScaleLegacy.fsh
@@ -1,10 +1,10 @@
 
-float quickDistance(vec4 a, vec4 b)
+STATIC float quickDistance(vec4 a, vec4 b)
 {
     return abs(a.x - b.x) + abs(a.y - b.y) + abs(a.z - b.z);
 }
 
-vec4 omniScale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 omniScale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     vec2 pixel = position * input_resolution - vec2(0.5, 0.5);
 
@@ -104,7 +104,7 @@ vec4 omniScale(sampler2D image, vec2 position, vec2 input_resolution, vec2 outpu
     return q22;
 }
 
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     vec2 pixel = vec2(1.0, 1.0) / output_resolution;
     // 4-pixel super sampling
diff --git a/Shaders/AAScale2x.fsh b/Shaders/AAScale2x.fsh
index 220e14b3..d51a9a6a 100644
--- a/Shaders/AAScale2x.fsh
+++ b/Shaders/AAScale2x.fsh
@@ -1,4 +1,4 @@
-vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     // o = offset, the width of a pixel
     vec2 o = 1.0 / input_resolution;
@@ -7,15 +7,15 @@ vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_
     // A B C
     // D E F
     // G H I
-    vec4 A = texture(image, position + vec2( -o.x,  o.y));
+    // vec4 A = texture(image, position + vec2( -o.x,  o.y));
     vec4 B = texture(image, position + vec2(    0,  o.y));
-    vec4 C = texture(image, position + vec2(  o.x,  o.y));
+    // vec4 C = texture(image, position + vec2(  o.x,  o.y));
     vec4 D = texture(image, position + vec2( -o.x,    0));
     vec4 E = texture(image, position + vec2(    0,    0));
     vec4 F = texture(image, position + vec2(  o.x,    0));
-    vec4 G = texture(image, position + vec2( -o.x, -o.y));
+    // vec4 G = texture(image, position + vec2( -o.x, -o.y));
     vec4 H = texture(image, position + vec2(    0, -o.y));
-    vec4 I = texture(image, position + vec2(  o.x, -o.y));
+    // vec4 I = texture(image, position + vec2(  o.x, -o.y));
     vec2 p = position * input_resolution;
     // p = the position within a pixel [0...1]
     p = fract(p);
@@ -38,7 +38,7 @@ vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_
     }
 }
 
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     return mix(texture(image, position), scale2x(image, position, input_resolution, output_resolution), 0.5);
 }
diff --git a/Shaders/AAScale4x.fsh b/Shaders/AAScale4x.fsh
index 9f378626..b59b80e9 100644
--- a/Shaders/AAScale4x.fsh
+++ b/Shaders/AAScale4x.fsh
@@ -1,4 +1,4 @@
-vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     // o = offset, the width of a pixel
     vec2 o = 1.0 / input_resolution;
@@ -6,15 +6,15 @@ vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_
     // A B C
     // D E F
     // G H I
-    vec4 A = texture(image, position + vec2( -o.x,  o.y));
+    // vec4 A = texture(image, position + vec2( -o.x,  o.y));
     vec4 B = texture(image, position + vec2(    0,  o.y));
-    vec4 C = texture(image, position + vec2(  o.x,  o.y));
+    // vec4 C = texture(image, position + vec2(  o.x,  o.y));
     vec4 D = texture(image, position + vec2( -o.x,    0));
     vec4 E = texture(image, position + vec2(    0,    0));
     vec4 F = texture(image, position + vec2(  o.x,    0));
-    vec4 G = texture(image, position + vec2( -o.x, -o.y));
+    // vec4 G = texture(image, position + vec2( -o.x, -o.y));
     vec4 H = texture(image, position + vec2(    0, -o.y));
-    vec4 I = texture(image, position + vec2(  o.x, -o.y));
+    // vec4 I = texture(image, position + vec2(  o.x, -o.y));
     vec2 p = position * input_resolution;
     // p = the position within a pixel [0...1]
     p = fract(p);
@@ -37,12 +37,12 @@ vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_
     }
 }
 
-vec4 aaScale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 aaScale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     return mix(texture(image, position), scale2x(image, position, input_resolution, output_resolution), 0.5);
 }
 
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     // o = offset, the width of a pixel
     vec2 o = 1.0 / (input_resolution * 2.);
@@ -51,15 +51,15 @@ vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_re
     // A B C
     // D E F
     // G H I
-    vec4 A = aaScale2x(image, position + vec2( -o.x,  o.y), input_resolution, output_resolution);
+    // vec4 A = aaScale2x(image, position + vec2( -o.x,  o.y), input_resolution, output_resolution);
     vec4 B = aaScale2x(image, position + vec2(    0,  o.y), input_resolution, output_resolution);
-    vec4 C = aaScale2x(image, position + vec2(  o.x,  o.y), input_resolution, output_resolution);
+    // vec4 C = aaScale2x(image, position + vec2(  o.x,  o.y), input_resolution, output_resolution);
     vec4 D = aaScale2x(image, position + vec2( -o.x,    0), input_resolution, output_resolution);
     vec4 E = aaScale2x(image, position + vec2(    0,    0), input_resolution, output_resolution);
     vec4 F = aaScale2x(image, position + vec2(  o.x,    0), input_resolution, output_resolution);
-    vec4 G = aaScale2x(image, position + vec2( -o.x, -o.y), input_resolution, output_resolution);
+    // vec4 G = aaScale2x(image, position + vec2( -o.x, -o.y), input_resolution, output_resolution);
     vec4 H = aaScale2x(image, position + vec2(    0, -o.y), input_resolution, output_resolution);
-    vec4 I = aaScale2x(image, position + vec2(  o.x, -o.y), input_resolution, output_resolution);
+    // vec4 I = aaScale2x(image, position + vec2(  o.x, -o.y), input_resolution, output_resolution);
     vec4 R;
     vec2 p = position * input_resolution * 2.;
     // p = the position within a pixel [0...1]
diff --git a/Shaders/Bilinear.fsh b/Shaders/Bilinear.fsh
index 8283bdf0..e68e1d19 100644
--- a/Shaders/Bilinear.fsh
+++ b/Shaders/Bilinear.fsh
@@ -1,4 +1,4 @@
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     vec2 pixel = position * input_resolution - vec2(0.5, 0.5);
 
diff --git a/Shaders/HQ2x.fsh b/Shaders/HQ2x.fsh
index a9832a02..3871db92 100644
--- a/Shaders/HQ2x.fsh
+++ b/Shaders/HQ2x.fsh
@@ -2,14 +2,14 @@
 
 /* The colorspace used by the HQnx filters is not really YUV, despite the algorithm description claims it is. It is
    also not normalized. Therefore, we shall call the colorspace used by HQnx "HQ Colorspace" to avoid confusion. */
-vec3 rgb_to_hq_colospace(vec4 rgb)
+STATIC vec3 rgb_to_hq_colospace(vec4 rgb)
 {
     return vec3( 0.250 * rgb.r + 0.250 * rgb.g + 0.250 * rgb.b,
                  0.250 * rgb.r - 0.000 * rgb.g - 0.250 * rgb.b,
                 -0.125 * rgb.r + 0.250 * rgb.g - 0.125 * rgb.b);
 }
 
-bool is_different(vec4 a, vec4 b)
+STATIC bool is_different(vec4 a, vec4 b)
 {
     vec3 diff = abs(rgb_to_hq_colospace(a) - rgb_to_hq_colospace(b));
     return diff.x > 0.188 || diff.y > 0.027 || diff.z > 0.031;
@@ -17,17 +17,17 @@ bool is_different(vec4 a, vec4 b)
 
 #define P(m, r) ((pattern & (m)) == (r))
 
-vec4 interp_2px(vec4 c1, float w1, vec4 c2, float w2)
+STATIC vec4 interp_2px(vec4 c1, float w1, vec4 c2, float w2)
 {
     return (c1 * w1 + c2 * w2) / (w1 + w2);
 }
 
-vec4 interp_3px(vec4 c1, float w1, vec4 c2, float w2, vec4 c3, float w3)
+STATIC vec4 interp_3px(vec4 c1, float w1, vec4 c2, float w2, vec4 c3, float w3)
 {
     return (c1 * w1 + c2 * w2 + c3 * w3) / (w1 + w2 + w3);
 }
 
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     // o = offset, the width of a pixel
     vec2 o = 1.0 / input_resolution;
diff --git a/Shaders/LCD.fsh b/Shaders/LCD.fsh
index 236456fb..d20a7c93 100644
--- a/Shaders/LCD.fsh
+++ b/Shaders/LCD.fsh
@@ -2,7 +2,7 @@
 #define COLOR_HIGH 1.0
 #define SCANLINE_DEPTH 0.1
 
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     vec2 pos = fract(position * input_resolution);
     vec2 sub_pos = fract(position * input_resolution * 6);
diff --git a/Shaders/MasterShader.fsh b/Shaders/MasterShader.fsh
index 61a08db5..55cdf49f 100644
--- a/Shaders/MasterShader.fsh
+++ b/Shaders/MasterShader.fsh
@@ -9,6 +9,7 @@ const vec2 input_resolution = vec2(160, 144);
 
 #define equal(x, y) ((x) == (y))
 #define inequal(x, y) ((x) != (y))
+#define STATIC
 
 out vec4 frag_color;
 
diff --git a/Shaders/MasterShader.metal b/Shaders/MasterShader.metal
index 83530945..589c4aca 100644
--- a/Shaders/MasterShader.metal
+++ b/Shaders/MasterShader.metal
@@ -12,6 +12,7 @@ typedef float4 vec4;
 typedef texture2d<half> sampler2D;
 #define equal(x, y) all((x) == (y))
 #define inequal(x, y) any((x) != (y))
+#define STATIC static
 
 typedef struct {
     float4 position [[position]];
diff --git a/Shaders/NearestNeighbor.fsh b/Shaders/NearestNeighbor.fsh
index 24fd66b9..7f37024c 100644
--- a/Shaders/NearestNeighbor.fsh
+++ b/Shaders/NearestNeighbor.fsh
@@ -1,4 +1,4 @@
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     return texture(image, position);
 }
diff --git a/Shaders/OmniScale.fsh b/Shaders/OmniScale.fsh
index 985fc98b..bb2b7d65 100644
--- a/Shaders/OmniScale.fsh
+++ b/Shaders/OmniScale.fsh
@@ -8,7 +8,7 @@
  */
 
 /* We use the same colorspace as the HQ algorithms. */
-vec3 rgb_to_hq_colospace(vec4 rgb)
+STATIC vec3 rgb_to_hq_colospace(vec4 rgb)
 {
     return vec3( 0.250 * rgb.r + 0.250 * rgb.g + 0.250 * rgb.b,
                  0.250 * rgb.r - 0.000 * rgb.g - 0.250 * rgb.b,
@@ -16,7 +16,7 @@ vec3 rgb_to_hq_colospace(vec4 rgb)
 }
 
 
-bool is_different(vec4 a, vec4 b)
+STATIC bool is_different(vec4 a, vec4 b)
 {
     vec3 diff = abs(rgb_to_hq_colospace(a) - rgb_to_hq_colospace(b));
     return diff.x > 0.125 || diff.y > 0.027 || diff.z > 0.031;
@@ -24,7 +24,7 @@ bool is_different(vec4 a, vec4 b)
 
 #define P(m, r) ((pattern & (m)) == (r))
 
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     // o = offset, the width of a pixel
     vec2 o = 1.0 / input_resolution;
diff --git a/Shaders/OmniScaleLegacy.fsh b/Shaders/OmniScaleLegacy.fsh
index 90ace69a..06849fdd 100644
--- a/Shaders/OmniScaleLegacy.fsh
+++ b/Shaders/OmniScaleLegacy.fsh
@@ -1,10 +1,9 @@
-
-float quickDistance(vec4 a, vec4 b)
+STATIC float quickDistance(vec4 a, vec4 b)
 {
     return abs(a.x - b.x) + abs(a.y - b.y) + abs(a.z - b.z);
 }
 
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     vec2 pixel = position * input_resolution - vec2(0.5, 0.5);
 
diff --git a/Shaders/Scale2x.fsh b/Shaders/Scale2x.fsh
index ff774403..17b6edb8 100644
--- a/Shaders/Scale2x.fsh
+++ b/Shaders/Scale2x.fsh
@@ -1,6 +1,6 @@
 /* Shader implementation of Scale2x is adapted from https://gist.github.com/singron/3161079 */
 
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     // o = offset, the width of a pixel
     vec2 o = 1.0 / input_resolution;
@@ -9,15 +9,15 @@ vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_re
     // A B C
     // D E F
     // G H I
-    vec4 A = texture(image, position + vec2( -o.x,  o.y));
+    // vec4 A = texture(image, position + vec2( -o.x,  o.y));
     vec4 B = texture(image, position + vec2(    0,  o.y));
-    vec4 C = texture(image, position + vec2(  o.x,  o.y));
+    // vec4 C = texture(image, position + vec2(  o.x,  o.y));
     vec4 D = texture(image, position + vec2( -o.x,    0));
     vec4 E = texture(image, position + vec2(    0,    0));
     vec4 F = texture(image, position + vec2(  o.x,    0));
-    vec4 G = texture(image, position + vec2( -o.x, -o.y));
+    // vec4 G = texture(image, position + vec2( -o.x, -o.y));
     vec4 H = texture(image, position + vec2(    0, -o.y));
-    vec4 I = texture(image, position + vec2(  o.x, -o.y));
+    // vec4 I = texture(image, position + vec2(  o.x, -o.y));
     vec2 p = position * input_resolution;
     // p = the position within a pixel [0...1]
     p = fract(p);
diff --git a/Shaders/Scale4x.fsh b/Shaders/Scale4x.fsh
index 1edf8006..da1ff148 100644
--- a/Shaders/Scale4x.fsh
+++ b/Shaders/Scale4x.fsh
@@ -1,4 +1,4 @@
-vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     // o = offset, the width of a pixel
     vec2 o = 1.0 / input_resolution;
@@ -6,15 +6,15 @@ vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_
     // A B C
     // D E F
     // G H I
-    vec4 A = texture(image, position + vec2( -o.x,  o.y));
+    // vec4 A = texture(image, position + vec2( -o.x,  o.y));
     vec4 B = texture(image, position + vec2(    0,  o.y));
-    vec4 C = texture(image, position + vec2(  o.x,  o.y));
+    // vec4 C = texture(image, position + vec2(  o.x,  o.y));
     vec4 D = texture(image, position + vec2( -o.x,    0));
     vec4 E = texture(image, position + vec2(    0,    0));
     vec4 F = texture(image, position + vec2(  o.x,    0));
-    vec4 G = texture(image, position + vec2( -o.x, -o.y));
+    // vec4 G = texture(image, position + vec2( -o.x, -o.y));
     vec4 H = texture(image, position + vec2(    0, -o.y));
-    vec4 I = texture(image, position + vec2(  o.x, -o.y));
+    // vec4 I = texture(image, position + vec2(  o.x, -o.y));
     vec2 p = position * input_resolution;
     // p = the position within a pixel [0...1]
     vec4 R;
@@ -38,7 +38,7 @@ vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_
     }
 }
 
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     // o = offset, the width of a pixel
     vec2 o = 1.0 / (input_resolution * 2.);
@@ -47,15 +47,15 @@ vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_re
     // A B C
     // D E F
     // G H I
-    vec4 A = scale2x(image, position + vec2( -o.x,  o.y), input_resolution, output_resolution);
+    // vec4 A = scale2x(image, position + vec2( -o.x,  o.y), input_resolution, output_resolution);
     vec4 B = scale2x(image, position + vec2(    0,  o.y), input_resolution, output_resolution);
-    vec4 C = scale2x(image, position + vec2(  o.x,  o.y), input_resolution, output_resolution);
+    // vec4 C = scale2x(image, position + vec2(  o.x,  o.y), input_resolution, output_resolution);
     vec4 D = scale2x(image, position + vec2( -o.x,    0), input_resolution, output_resolution);
     vec4 E = scale2x(image, position + vec2(    0,    0), input_resolution, output_resolution);
     vec4 F = scale2x(image, position + vec2(  o.x,    0), input_resolution, output_resolution);
-    vec4 G = scale2x(image, position + vec2( -o.x, -o.y), input_resolution, output_resolution);
+    // vec4 G = scale2x(image, position + vec2( -o.x, -o.y), input_resolution, output_resolution);
     vec4 H = scale2x(image, position + vec2(    0, -o.y), input_resolution, output_resolution);
-    vec4 I = scale2x(image, position + vec2(  o.x, -o.y), input_resolution, output_resolution);
+    // vec4 I = scale2x(image, position + vec2(  o.x, -o.y), input_resolution, output_resolution);
     vec2 p = position * input_resolution * 2.;
     // p = the position within a pixel [0...1]
     p = fract(p);
diff --git a/Shaders/SmoothBilinear.fsh b/Shaders/SmoothBilinear.fsh
index 2082cd2f..d5082772 100644
--- a/Shaders/SmoothBilinear.fsh
+++ b/Shaders/SmoothBilinear.fsh
@@ -1,4 +1,4 @@
-vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
+STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
 {
     vec2 pixel = position * input_resolution - vec2(0.5, 0.5);