diff --git a/crt/crt-geom.slang b/crt/crt-geom.slang
new file mode 100644
index 0000000..88fdb57
--- /dev/null
+++ b/crt/crt-geom.slang
@@ -0,0 +1,296 @@
+#version 450
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+   vec4 OutputSize;
+   vec4 OriginalSize;
+   vec4 SourceSize;
+   uint FrameCount;
+} global;
+
+#define CRTgamma 2.4
+#define monitorgamma 2.2
+#define d 1.5
+#define CURVATURE 1.0
+#define R 2.0
+#define cornersize 0.03
+#define cornersmooth 1000.0
+#define x_tilt 0.0
+#define y_tilt 0.0
+#define overscan_x 100.0
+#define overscan_y 100.0
+#define DOTMASK 0.3
+#define SHARPER 1.0
+#define scanline_weight 0.3
+
+/*
+    CRT-interlaced
+
+    Copyright (C) 2010-2012 cgwg, Themaister and DOLLS
+
+    This program is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2 of the License, or (at your option)
+    any later version.
+
+    (cgwg gave their consent to have the original version of this shader
+    distributed under the GPL in this message:
+
+        http://board.byuu.org/viewtopic.php?p=26075#p26075
+
+        "Feel free to distribute my shaders under the GPL. After all, the
+        barrel distortion code was taken from the Curvature shader, which is
+        under the GPL."
+    )
+	This shader variant is pre-configured with screen curvature
+*/
+
+        // Comment the next line to disable interpolation in linear gamma (and
+        // gain speed).
+        #define LINEAR_PROCESSING
+
+        // Enable 3x oversampling of the beam profile; improves moire effect caused by scanlines+curvature
+        #define OVERSAMPLE
+
+        // Use the older, purely gaussian beam profile; uncomment for speed
+        //#define USEGAUSSIAN
+      
+        // Use interlacing detection; may interfere with other shaders if combined
+        #define INTERLACED
+	  
+	    // Enable Dot-mask emulation:
+        // Output pixels are alternately tinted green and magenta.
+//        #define DOTMASK
+
+        // Macros.
+        #define FIX(c) max(abs(c), 1e-5);
+        #define PI 3.141592653589
+
+        #ifdef LINEAR_PROCESSING
+        #       define TEX2D(c) pow(texture(Source, (c)), vec4(CRTgamma))
+        #else
+        #       define TEX2D(c) texture(Source, (c))
+        #endif
+
+        // aspect ratio
+        static vec2 aspect = vec2(1.0, 0.75);
+
+float intersect(vec2 xy, vec2 sinangle, vec2 cosangle)
+        {
+                float A = dot(xy,xy)+d*d;
+                float B = 2.0*(R*(dot(xy,sinangle)-d*cosangle.x*cosangle.y)-d*d);
+                float C = d*d + 2.0*R*d*cosangle.x*cosangle.y;
+                return (-B-sqrt(B*B-4.0*A*C))/(2.0*A);
+        }
+
+loat2 bkwtrans(vec2 xy, vec2 sinangle, vec2 cosangle)
+        {
+                float c = intersect(xy, sinangle, cosangle);
+                float2 point = vec2(c)*xy;
+                point -= vec2(-R)*sinangle;
+                point /= vec2(R);
+                vec2 tang = sinangle/cosangle;
+                vec2 poc = point/cosangle;
+                float A = dot(tang,tang)+1.0;
+                float B = -2.0*dot(poc,tang);
+                float C = dot(poc,poc)-1.0;
+                float a = (-B+sqrt(B*B-4.0*A*C))/(2.0*A);
+                vec2 uv = (point-a*sinangle)/cosangle;
+                float r = FIX(R*acos(a));
+                return uv*r/sin(r/R);
+        }
+
+vec2 fwtrans(vec2 uv, vec2 sinangle, vec2 cosangle)
+        {
+                float r = FIX(sqrt(dot(uv,uv)));
+                uv *= sin(r/R)/r;
+                float x = 1.0-cos(r/R);
+                float D = d/R + x*cosangle.x*cosangle.y+dot(uv,sinangle);
+                return d*(uv*cosangle-x*sinangle)/D;
+        }
+
+vec3 maxscale(vec2 sinangle, float2 cosangle)
+        {
+                vec2 c = bkwtrans(-R * sinangle / (1.0 + R/d*cosangle.x*cosangle.y), sinangle, cosangle);
+                vec2 a = vec2(0.5,0.5)*aspect;
+                vec2 lo = vec2(fwtrans(vec2(-a.x,c.y), sinangle, cosangle).x,
+                             fwtrans(vec2(c.x,-a.y), sinangle, cosangle).y)/aspect;
+                vec2 hi = vec2(fwtrans(vec2(+a.x,c.y), sinangle, cosangle).x,
+                             fwtrans(vec2(c.x,+a.y), sinangle, cosangle).y)/aspect;
+                return vec2((hi+lo)*aspect*0.5,max(hi.x-lo.x,hi.y-lo.y));
+        }
+
+        // Calculate the influence of a scanline on the current pixel.
+        //
+        // 'distance' is the distance in texture coordinates from the current
+        // pixel to the scanline in question.
+        // 'color' is the colour of the scanline at the horizontal location of
+        // the current pixel.
+        vec4 scanlineWeights(float distance, float4 color)
+        {
+                // "wid" controls the width of the scanline beam, for each RGB
+                // channel The "weights" lines basically specify the formula
+                // that gives you the profile of the beam, i.e. the intensity as
+                // a function of distance from the vertical center of the
+                // scanline. In this case, it is gaussian if width=2, and
+                // becomes nongaussian for larger widths. Ideally this should
+                // be normalized so that the integral across the beam is
+                // independent of its width. That is, for a narrower beam
+                // "weights" should have a higher peak at the center of the
+                // scanline than for a wider beam.
+        #ifdef USEGAUSSIAN
+                vec4 wid = 0.3 + 0.1 * pow(color, vec4(3.0));
+                vec4 weights = vec4(distance / wid);
+                return 0.4 * exp(-weights * weights) / wid;
+        #else
+                vec4 wid = 2.0 + 2.0 * pow(color, vec4(4.0));
+                vec4 weights = vec4(distance / scanline_weight);
+                return 1.4 * exp(-pow(weights * rsqrt(0.5 * wid), wid)) / (0.6 + 0.2 * wid);
+        #endif
+        }
+
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+   vTexCoord = TexCoord;
+
+
+  // Precalculate a bunch of useful values we'll need in the fragment
+  // shader.
+  vec2 sinangle = sin(angle);
+  vec2 cosangle = cos(angle);
+  vec3 stretch = maxscale();
+
+  vec2 ilfac = vec2(1.0,floor(sourceSize[0].y/200.0));
+
+  // The size of one texel, in texture-coordinates.
+  vec2 one = ilfac / sourceSize[0].xy;
+
+  // Resulting X pixel-coordinate of the pixel we're drawing.
+  float mod_factor = texCoord.x * targetSize.x;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 1) in vec2 FragCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+void main()
+{
+  // Here's a helpful diagram to keep in mind while trying to
+  // understand the code:
+  //
+  //  |      |      |      |      |
+  // -------------------------------
+  //  |      |      |      |      |
+  //  |  01  |  11  |  21  |  31  | <-- current scanline
+  //  |      | @    |      |      |
+  // -------------------------------
+  //  |      |      |      |      |
+  //  |  02  |  12  |  22  |  32  | <-- next scanline
+  //  |      |      |      |      |
+  // -------------------------------
+  //  |      |      |      |      |
+  //
+  // Each character-cell represents a pixel on the output
+  // surface, "@" represents the current pixel (always somewhere
+  // in the bottom half of the current scan-line, or the top-half
+  // of the next scanline). The grid of lines represents the
+  // edges of the texels of the underlying texture.
+
+  // Texture coordinates of the texel containing the active pixel.
+#ifdef CURVATURE
+  vec2 xy = transform(vTexCoord);
+#else
+  vec2 xy = vTexCoord;
+#endif
+  float cval = corner(xy);
+
+  // Of all the pixels that are mapped onto the texel we are
+  // currently rendering, which pixel are we currently rendering?
+#ifdef INTERLACED
+  vec2 ilvec = vec2(0.0,ilfac.y > 1.5 ? mod(float(global.FrameCount),2.0) : 0.0);
+#else
+  vec2 ilvec = vec2(0.0,ilfac.y);
+#endif
+  vec2 ratio_scale = (xy * global.SourceSize.xy - vec2(0.5, 0.5) + ilvec)/ilfac;
+#ifdef OVERSAMPLE
+  float filter_ = global.SourceSize.y / global.OutputSize.y;
+#endif
+  vec2 uv_ratio = fract(ratio_scale);
+
+  // Snap to the center of the underlying texel.
+  xy = (floor(ratio_scale)*ilfac + vec2(0.5, 0.5) - ilvec) / global.OutputSize.xy;
+
+  // Calculate Lanczos scaling coefficients describing the effect
+  // of various neighbour texels in a scanline on the current
+  // pixel.
+  vec4 coeffs = PI * vec4(1.0 + uv_ratio.x, uv_ratio.x, 1.0 - uv_ratio.x, 2.0 - uv_ratio.x);
+
+  // Prevent division by zero.
+  coeffs = FIX(coeffs);
+
+  // Lanczos2 kernel.
+  coeffs = 2.0 * sin(coeffs) * sin(coeffs / 2.0) / (coeffs * coeffs);
+
+  // Normalize.
+  coeffs /= dot(coeffs, vec4(1.0));
+
+  // Calculate the effective colour of the current and next
+  // scanlines at the horizontal location of the current pixel,
+  // using the Lanczos coefficients above.
+  vec4 col  = clamp(mat4(
+			 TEX2D(xy + vec2(-one.x, 0.0)),
+			 TEX2D(xy),
+			 TEX2D(xy + vec2(one.x, 0.0)),
+			 TEX2D(xy + vec2(2.0 * one.x, 0.0))) * coeffs,
+		    0.0, 1.0);
+  vec4 col2 = clamp(mat4(
+			 TEX2D(xy + vec2(-one.x, one.y)),
+			 TEX2D(xy + vec2(0.0, one.y)),
+			 TEX2D(xy + one),
+			 TEX2D(xy + vec2(2.0 * one.x, one.y))) * coeffs,
+		    0.0, 1.0);
+
+#ifndef LINEAR_PROCESSING
+  col  = pow(col , vec4(CRTgamma));
+  col2 = pow(col2, vec4(CRTgamma));
+#endif
+
+  // Calculate the influence of the current and next scanlines on
+  // the current pixel.
+  vec4 weights  = scanlineWeights(uv_ratio.y, col);
+  vec4 weights2 = scanlineWeights(1.0 - uv_ratio.y, col2);
+#ifdef OVERSAMPLE
+  uv_ratio.y =uv_ratio.y+1.0/3.0*filter_;
+  weights = (weights+scanlineWeights(uv_ratio.y, col))/3.0;
+  weights2=(weights2+scanlineWeights(abs(1.0-uv_ratio.y), col2))/3.0;
+  uv_ratio.y =uv_ratio.y-2.0/3.0*filter_;
+  weights=weights+scanlineWeights(abs(uv_ratio.y), col)/3.0;
+  weights2=weights2+scanlineWeights(abs(1.0-uv_ratio.y), col2)/3.0;
+#endif
+  vec3 mul_res  = (col * weights + col2 * weights2).rgb * vec3(cval);
+
+  // dot-mask emulation:
+  // Output pixels are alternately tinted green and magenta.
+  vec3 dotMaskWeights = mix(
+          vec3(1.0, 0.7, 1.0),
+          vec3(0.7, 1.0, 0.7),
+          floor(mod(mod_factor, 2.0))
+      );
+					
+  mul_res *= dotMaskWeights;
+
+  // Convert the image gamma for display on our output device.
+  mul_res = pow(mul_res, vec3(1.0 / monitorgamma));
+
+FragColor = vec4(mul_res, 1.0);
+}
diff --git a/crt/crt-geom.slangp b/crt/crt-geom.slangp
new file mode 100644
index 0000000..7addf36
--- /dev/null
+++ b/crt/crt-geom.slangp
@@ -0,0 +1,5 @@
+shaders = 1
+
+shader0 = crt-geom.slang
+filter_linear0 = false
+scale_type_0 = source