Added Tomoya's scene for showcase!!!

sfpcContourProject/contourApp/bin/data/tomoya_shader/datashader.frag

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+#version 150
+
+//uniform vec2 u_mouse;
+uniform sampler2DRect tex0;
+#define MAX_ITEMS 100
+uniform vec2 current[MAX_ITEMS];
+uniform vec2 past[MAX_ITEMS];
+
+uniform vec2 resolution;
+uniform float scale;
+in vec2 texCoordVarying;
+uniform float time; //0~30
+
+out vec4 outputColor;
+
+vec3 rgb2hsb( in vec3 c ){
+    vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
+    vec4 p = mix(vec4(c.bg, K.wz),
+                 vec4(c.gb, K.xy),
+                 step(c.b, c.g));
+    vec4 q = mix(vec4(p.xyw, c.r),
+                 vec4(c.r, p.yzx),
+                 step(p.x, c.r));
+    float d = q.x - min(q.w, q.y);
+    float e = 1.0e-10;
+    return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)),
+                d / (q.x + e),
+                q.x);
+}
+
+//  Function from Iñigo Quiles
+//  https://www.shadertoy.com/view/MsS3Wc
+vec3 hsb2rgb( in vec3 c ){
+    vec3 rgb = clamp(abs(mod(c.x*6.0+vec3(0.0,4.0,2.0),
+                             6.0)-3.0)-1.0,
+                     0.0,
+                     1.0 );
+    rgb = rgb*rgb*(3.0-2.0*rgb);
+    return c.z * mix(vec3(1.0), rgb, c.y);
+}
+// 2D Random
+float random (in vec2 st) {
+    return fract(sin(dot(st.xy,
+                         vec2(12.9898,78.233)))
+                 * 43758.5453123);
+}
+
+// 2D Noise based on Morgan McGuire @morgan3d
+// https://www.shadertoy.com/view/4dS3Wd
+float noise (in vec2 st) {
+    vec2 i = floor(st);
+    vec2 f = fract(st);
+
+    // Four corners in 2D of a tile
+    float a = random(i);
+    float b = random(i + vec2(1.0, 0.0));
+    float c = random(i + vec2(0.0, 1.0));
+    float d = random(i + vec2(1.0, 1.0));
+
+    // Smooth Interpolation
+
+    // Cubic Hermine Curve.  Same as SmoothStep()
+    vec2 u = f*f*(3.0-2.0*f);
+    // u = smoothstep(0.,1.,f);
+
+    // Mix 4 coorners percentages
+    return mix(a, b, u.x) +
+    (c - a)* u.y * (1.0 - u.x) +
+    (d - b) * u.x * u.y;
+}
+float mod289(float x){return x - floor(x * (1.0 / 289.0)) * 289.0;}
+vec4 mod289(vec4 x){return x - floor(x * (1.0 / 289.0)) * 289.0;}
+vec4 perm(vec4 x){return mod289(((x * 34.0) + 1.0) * x);}
+
+float noise(vec3 p){
+    vec3 a = floor(p);
+    vec3 d = p - a;
+    d = d * d * (3.0 - 2.0 * d);
+
+    vec4 b = a.xxyy + vec4(0.0, 1.0, 0.0, 1.0);
+    vec4 k1 = perm(b.xyxy);
+    vec4 k2 = perm(k1.xyxy + b.zzww);
+
+    vec4 c = k2 + a.zzzz;
+    vec4 k3 = perm(c);
+    vec4 k4 = perm(c + 1.0);
+
+    vec4 o1 = fract(k3 * (1.0 / 41.0));
+    vec4 o2 = fract(k4 * (1.0 / 41.0));
+
+    vec4 o3 = o2 * d.z + o1 * (1.0 - d.z);
+    vec2 o4 = o3.yw * d.x + o3.xz * (1.0 - d.x);
+
+    return o4.y * d.y + o4.x * (1.0 - d.y);
+}
+
+void main() {
+    vec2 st = gl_FragCoord.xy;
+    vec2 normst = gl_FragCoord.xy/640;
+    //vec2 center = resolution/2.0;
+    // Scale the coordinate system to see
+    // some noise in action
+    //    vec2 pos = vec2(st*7.);
+    float theta = 1.0;
+    // Use the noise function
+    vec4 color = vec4(0., 0., 0., 1.0);
+
+    for (int i =0; i<100; i+=1) {
+        vec2 pos  = current[i];
+        vec2 pos2 = past[i];
+        vec2 vel = (pos2-pos)*0.06*scale;
+        float poscolormap = max(0,1-0.01*length(st-pos.xy));
+        color.r += poscolormap*vel.x;
+        color.g += poscolormap*vel.y;
+    }
+    //    vec2 center = resolution/2.0;
+
+    //    vec3 pos  = texture(data,vec2(12,time)).rgb; // x is pos,y is time
+    //    vec3 pos2 = texture(data,vec2(12,mod(time+1,30))).rgb; // x is pos,y is time
+    //    vec3 vel = pos2-pos;
+    //    color.r += scale*(10-length(st-pos.xy));
+    //    color.g += scale*(10-length(st-pos.xy));
+    vec4 outc = (0.11)*color+0.9*texture(tex0,st);
+    outputColor = vec4(outc.rgb,1.0);
+}
+
+

sfpcContourProject/contourApp/bin/data/tomoya_shader/datashader.vert

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+#version 150
+
+// these are for the programmable pipeline system
+uniform mat4 modelViewProjectionMatrix;
+uniform mat4 textureMatrix;
+
+in vec4 position;
+in vec2 texcoord;
+in vec4 normal;
+in vec4 color;
+
+out vec2 texCoordVarying;
+
+void main()
+{
+#ifdef INTEL_CARD
+    color = vec4(1.0); // for intel HD cards
+    normal = vec4(1.0); // for intel HD cards
+#endif
+
+    texCoordVarying = texcoord;
+    gl_Position = modelViewProjectionMatrix * position;
+}

sfpcContourProject/contourApp/bin/data/tomoya_shader/datashader2.frag

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+#version 150
+
+//uniform vec2 u_mouse;
+uniform sampler2DRect tex0;
+uniform sampler2DRect accel;
+#define MAX_ITEMS 100
+uniform vec2 current[MAX_ITEMS];
+uniform vec2 past[MAX_ITEMS];
+
+uniform vec2 resolution;
+uniform float scale;
+in vec2 texCoordVarying;
+uniform float time; //0~30
+
+out vec4 outputColor;
+
+vec3 rgb2hsb( in vec3 c ){
+    vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
+    vec4 p = mix(vec4(c.bg, K.wz),
+                 vec4(c.gb, K.xy),
+                 step(c.b, c.g));
+    vec4 q = mix(vec4(p.xyw, c.r),
+                 vec4(c.r, p.yzx),
+                 step(p.x, c.r));
+    float d = q.x - min(q.w, q.y);
+    float e = 1.0e-10;
+    return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)),
+                d / (q.x + e),
+                q.x);
+}
+
+//  Function from Iñigo Quiles
+//  https://www.shadertoy.com/view/MsS3Wc
+vec3 hsb2rgb( in vec3 c ){
+    vec3 rgb = clamp(abs(mod(c.x*6.0+vec3(0.0,4.0,2.0),
+                             6.0)-3.0)-1.0,
+                     0.0,
+                     1.0 );
+    rgb = rgb*rgb*(3.0-2.0*rgb);
+    return c.z * mix(vec3(1.0), rgb, c.y);
+}
+// 2D Random
+float random (in vec2 st) {
+    return fract(sin(dot(st.xy,
+                         vec2(12.9898,78.233)))
+                 * 43758.5453123);
+}
+
+// 2D Noise based on Morgan McGuire @morgan3d
+// https://www.shadertoy.com/view/4dS3Wd
+float noise (in vec2 st) {
+    vec2 i = floor(st);
+    vec2 f = fract(st);
+
+    // Four corners in 2D of a tile
+    float a = random(i);
+    float b = random(i + vec2(1.0, 0.0));
+    float c = random(i + vec2(0.0, 1.0));
+    float d = random(i + vec2(1.0, 1.0));
+
+    // Smooth Interpolation
+
+    // Cubic Hermine Curve.  Same as SmoothStep()
+    vec2 u = f*f*(3.0-2.0*f);
+    // u = smoothstep(0.,1.,f);
+
+    // Mix 4 coorners percentages
+    return mix(a, b, u.x) +
+    (c - a)* u.y * (1.0 - u.x) +
+    (d - b) * u.x * u.y;
+}
+float mod289(float x){return x - floor(x * (1.0 / 289.0)) * 289.0;}
+vec4 mod289(vec4 x){return x - floor(x * (1.0 / 289.0)) * 289.0;}
+vec4 perm(vec4 x){return mod289(((x * 34.0) + 1.0) * x);}
+
+float noise(vec3 p){
+    vec3 a = floor(p);
+    vec3 d = p - a;
+    d = d * d * (3.0 - 2.0 * d);
+
+    vec4 b = a.xxyy + vec4(0.0, 1.0, 0.0, 1.0);
+    vec4 k1 = perm(b.xyxy);
+    vec4 k2 = perm(k1.xyxy + b.zzww);
+
+    vec4 c = k2 + a.zzzz;
+    vec4 k3 = perm(c);
+    vec4 k4 = perm(c + 1.0);
+
+    vec4 o1 = fract(k3 * (1.0 / 41.0));
+    vec4 o2 = fract(k4 * (1.0 / 41.0));
+
+    vec4 o3 = o2 * d.z + o1 * (1.0 - d.z);
+    vec2 o4 = o3.yw * d.x + o3.xz * (1.0 - d.x);
+
+    return o4.y * d.y + o4.x * (1.0 - d.y);
+}
+
+void main() {
+
+    vec2 st = gl_FragCoord.xy;
+
+    vec4 color = vec4(0., 0., 0., 1.0);
+    vec4 color2 = vec4(0., 0., 0., 1.0);
+//
+//    for (int i =0; i<100; i+=1) {
+//        vec2 pos  = current[i];
+//        vec2 pos2 = past[i];
+//        vec2 vel = (pos2-pos)*0.06*scale;
+//        float poscolormap = max(0,1-0.01*length(st-pos.xy));
+//        color.r += poscolormap*vel.x;
+//        color.g += poscolormap*vel.y;
+//    }
+//
+    vec2 vel = texture(accel,st).rg ;//use rg to xy;
+
+    color2.r  = texture(tex0,st+vel*2.00).r;
+    color2.g  = texture(tex0,st+vel*2.05).g;
+    color2.b  = texture(tex0,st+vel*2.1).b;
+
+    color.rgb = texture(accel,st).rgb;
+
+    vec3 outc = color.rgb*0.14+0.9*color2.rgb;
+    outputColor =vec4(outc.rgb,1.0);
+
+}
+
+

sfpcContourProject/contourApp/bin/data/tomoya_shader/datashader2.vert

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+#version 150
+
+// these are for the programmable pipeline system
+uniform mat4 modelViewProjectionMatrix;
+uniform mat4 textureMatrix;
+
+in vec4 position;
+in vec2 texcoord;
+in vec4 normal;
+in vec4 color;
+
+out vec2 texCoordVarying;
+
+void main()
+{
+#ifdef INTEL_CARD
+    color = vec4(1.0); // for intel HD cards
+    normal = vec4(1.0); // for intel HD cards
+#endif
+
+    texCoordVarying = texcoord;
+    gl_Position = modelViewProjectionMatrix * position;
+}