Added shader packs

tools/packsrc/Neon Ball Pit/shaders/Common.frag

@@ -0,0 +1,47 @@
+// uncomment this line for a faster version
+//#define LOW_QUALITY
+
+
+#ifdef LOW_QUALITY
+#define AA 1
+#define DOF_SAMPLES 3
+#else
+#define AA 2
+#define DOF_SAMPLES 6
+#endif
+
+
+#define APERTURE .01
+#define DOF_CLAMPING .7
+#define FOCAL_DISTANCE 8.
+
+vec4 sampleDof(sampler2D channel, vec2 channelDim, vec2 dir, vec2 u) {
+    float screenAperture = channelDim.y*APERTURE;
+    float sampleToRad = screenAperture * DOF_CLAMPING / float(DOF_SAMPLES);
+    vec4 o = vec4(0);
+    float sum = 0.;
+    for(int i = -DOF_SAMPLES; i <= DOF_SAMPLES; i++) {
+        float sRad = float(i)*sampleToRad;
+        vec4 p = texture(channel, (u+dir*sRad)/channelDim);
+        float rad = min(abs(p.a-FOCAL_DISTANCE)/p.a, DOF_CLAMPING);
+        float influence = clamp((rad*screenAperture - abs(sRad)) + .5, 0., 1.) / (rad*rad+.001);
+        o += influence * p;
+        sum += influence;
+    }
+    return o/sum;
+}
+
+float fresnel(const vec3 dir, const vec3 n) {
+    const float ior = 1.8;
+    const float r0 = ((1. - ior) / (1. + ior)) * ((1. - ior) / (1. + ior));
+    float x = 1.+dot(n, dir);
+    return r0 + (1.-r0) * x*x*x*x*x;
+}
+
+mat3 rotationMatrix(const vec3 rotation) {
+    vec3 c = cos(rotation), s = sin(rotation);
+    mat3 rx = mat3(1, 0, 0, 0, c.x, -s.x, 0, s.x, c.x);
+    mat3 ry = mat3(c.y, 0, -s.y, 0, 1, 0, s.y, 0, c.y);
+    mat3 rz = mat3(c.z, -s.z, 0, s.z, c.z, 0, 0, 0, 1);
+    return rz * rx * ry;
+}