axmol/tests/cpp-tests/Source/ShaderTest/shaderTest.psh.h

/****************************************************************************
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axmolengine.github.io/

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 THE SOFTWARE.
 ****************************************************************************/

#define STRINGIFY(A) #A

static const char* starFlame = STRINGIFY(

    uniform vec2 center; uniform vec2 resolution;

    vec2 iResolution  = resolution;  // viewport resolution (in pixels)
    float iGlobalTime = AX_Time[1];  // shader playback time (in seconds)
    // uniform float     iChannelTime[4];       // channel playback time (in seconds)
    // uniform vec3      iChannelResolution[4]; // channel resolution (in pixels)
    vec4 iMouse = vec4(0, 0, 0, 0);  // mouse pixel coords. xy: current (if MLB down), zw: click
    // uniform sampler2D iChannel0;          // input channel. XX = 2D/Cube

    float noise(vec3 p)  // Thx to Las^Mercury
    {
        vec3 i = floor(p);
        vec4 a = dot(i, vec3(1., 57., 21.)) + vec4(0., 57., 21., 78.);
        vec3 f = cos((p - i) * acos(-1.)) * (-.5) + .5;
        a      = mix(sin(cos(a) * a), sin(cos(1. + a) * (1. + a)), f.x);
        a.xy   = mix(a.xz, a.yw, f.y);
        return mix(a.x, a.y, f.z);
    }

    float sphere(vec3 p, vec4 spr) { return length(spr.xyz - p) - spr.w; }

    float flame(vec3 p) {
        float d = sphere(p * vec3(1., .5, 1.), vec4(.0, -1., .0, 1.));
        return d + (noise(p + vec3(.0, iGlobalTime * 2., .0)) + noise(p * 3.) * .5) * .25 * (p.y);
    }

    float scene(vec3 p) { return min(100. - length(p), abs(flame(p))); }

    vec4 raymarch(vec3 org, vec3 dir) {
        float d     = 0.0;
        float glow  = 0.0;
        float eps   = 0.02;
        vec3 p      = org;
        bool glowed = false;

        for (int i = 0; i < 64; i++)
        {
            d = scene(p) + eps;
            p += d * dir;
            if (d > eps)
            {
                if (flame(p) < .0)
                    glowed = true;
                if (glowed)
                    glow = float(i) / 64.;
            }
        }
        return vec4(p, glow);
    }

    void main() {
        vec2 v = -1.0 + (2.0 * gl_FragCoord.xy) / iResolution.xy;
        // vec2 v = 2.0 * gl_FragCoord.xy / iResolution.xy;
        v.x *= iResolution.x / iResolution.y;

        vec3 org = vec3(0., -2., 4.);
        vec3 dir = normalize(vec3(v.x * 1.6, -v.y, -1.5));

        vec4 p     = raymarch(org, dir);
        float glow = p.w;

        vec4 col = mix(vec4(1., .5, .1, 1.), vec4(0.1, .5, 1., 1.), p.y * .02 + .4);

        gl_FragColor = mix(vec4(0.), col, pow(glow * 2., 4.));
        // gl_FragColor = col;
        // gl_FragColor = mix(vec4(1.), mix(vec4(1.,.5,.1,1.),vec4(0.1,.5,1.,1.),p.y*.02+.4), pow(glow*2.,4.));
    }

);

static const char* starNestFrg = STRINGIFY(

    uniform vec2 center; uniform vec2 resolution;

    vec2 iCenter      = center;
    vec2 iResolution  = resolution;  // viewport resolution (in pixels)
    float iGlobalTime = AX_Time[1];  // shader playback time (in seconds)
    // uniform float     iChannelTime[4];       // channel playback time (in seconds)
    // uniform vec3      iChannelResolution[4]; // channel resolution (in pixels)
    vec4 iMouse = vec4(0, 0, 0, 0);  // mouse pixel coords. xy: current (if MLB down), zw: click
    // uniform sampler2D iChannel0;          // input channel. XX = 2D/Cube

    // Star Nest by Pablo Román Andrioli

    // This content is under the MIT License.

    int iterations   = 17;
    float formuparam = 0.53;

    int volsteps   = 20;
    float stepsize = 0.1;

    float zoom  = 0.800;
    float tile  = 0.850;
    float speed = 0.010;

    float brightness = 0.0015;
    float darkmatter = 0.300;
    float distfading = 0.730;
    float saturation = 0.850;

    void main() {
        //	iCenter = vec2(300, 300);
        // get coords and direction
        vec2 uv = gl_FragCoord.xy / iResolution.xy - .5;
        // vec2 uv=gl_FragCoord.xy/iResolution.xy     ;
        // vec2 uv = ( 2* gl_FragCoord.xy - iCenter.xy) /  resolution.xy;
        uv.y *= iResolution.y / iResolution.x;

        // vec2 uv = 2.0* (gl_FragCoord.xy-iResolution.xy)/min(iResolution.y,iResolution.x);

        vec3 dir   = vec3(uv * zoom, 1.);
        float time = iGlobalTime * speed + .25;

        // mouse rotation
        float a1  = .5 + iMouse.x / iResolution.x * 2.;
        float a2  = .8 + iMouse.y / iResolution.y * 2.;
        mat2 rot1 = mat2(cos(a1), sin(a1), -sin(a1), cos(a1));
        mat2 rot2 = mat2(cos(a2), sin(a2), -sin(a2), cos(a2));
        dir.xz *= rot1;
        dir.xy *= rot2;
        vec3 from = vec3(1., .5, 0.5);
        from += vec3(time * 2., time, -2.);
        from.xz *= rot1;
        from.xy *= rot2;

        // volumetric rendering
        float s    = 0.1;
        float fade = 1.;
        vec3 v     = vec3(0.);
        for (int r = 0; r < volsteps; r++)
        {
            vec3 p = from + s * dir * .5;
            p      = abs(vec3(tile) - mod(p, vec3(tile * 2.)));  // tiling fold

            float a  = 0.;
            float pa = 0.;
            for (int i = 0; i < iterations; i++)
            {
                p = abs(p) / dot(p, p) - formuparam;  // the magic formula
                a += abs(length(p) - pa);             // absolute sum of average change
                pa = length(p);
            }
            float dm = max(0., darkmatter - a * a * .001);  // dark matter
            a *= a * a;                                     // add contrast
            if (r > 6)
                fade *= 1. - dm;  // dark matter, don't render near
            // v+=vec3(dm,dm*.5,0.);
            v += fade;
            v += vec3(s, s * s, s * s * s * s) * a * brightness * fade;  // coloring based on distance
            fade *= distfading;                                          // distance fading
            s += stepsize;
        }
        v            = mix(vec3(length(v)), v, saturation);  // color adjust
        gl_FragColor = vec4(v * .01, 1.);
    });

static const char* shadertoyRelentlessFrag = STRINGIFY(

    uniform vec2 center; uniform vec2 resolution;

    vec2 iCenter      = center;
    vec2 iResolution  = resolution;  // viewport resolution (in pixels)
    float iGlobalTime = AX_Time[1];  // shader playback time (in seconds)
                                     // uniform float     iChannelTime[4];       // channel playback time (in seconds)
    // uniform vec3      iChannelResolution[4]; // channel resolution (in pixels)

    vec4 iMouse = vec4(0, 0, 0, 0);  // mouse pixel coords. xy: current (if MLB down), zw: click
    // uniform sampler2D iChannel0;          // input channel. XX = 2D/Cube

    // srtuss, 2013
    // collecting some design ideas for a new game project.
    // no raymarching is used.

    // if i could add a custom soundtrack, it'd use this one (essential for desired sensation)
    // http://www.youtube.com/watch?v=1uFAu65tZpo

    //#define GREEN_VERSION

    // ** improved camera shaking
    // ** cleaned up code
    // ** added stuff to the gates

    float time = iGlobalTime;

    vec2 rotate(vec2 p, float a) {
        return vec2(p.x * cos(a) - p.y * sin(a), p.x * sin(a) + p.y * cos(a));
    } float box(vec2 p, vec2 b, float r) { return length(max(abs(p) - b, 0.0)) - r; }

    // iq's ray-plane-intersection code
    vec3 intersect(in vec3 o, in vec3 d, vec3 c, vec3 u, vec3 v) {
        vec3 q = o - c;
        return vec3(dot(cross(u, v), q), dot(cross(q, u), d), dot(cross(v, q), d)) / dot(cross(v, u), d);
    }

    // some noise functions for fast developing
    float rand11(float p) { return fract(sin(p * 591.32) * 43758.5357); }

    float rand12(vec2 p) { return fract(sin(dot(p.xy, vec2(12.9898, 78.233))) * 43758.5357); }

    vec2 rand21(float p) { return fract(vec2(sin(p * 591.32), cos(p * 391.32))); }

    vec2 rand22(in vec2 p) { return fract(vec2(sin(p.x * 591.32 + p.y * 154.077), cos(p.x * 391.32 + p.y * 49.077))); }

    float noise11(float p) {
        float fl = floor(p);
        return mix(rand11(fl), rand11(fl + 1.0), fract(p));  // smoothstep(0.0, 1.0, fract(p)));
    }

    float fbm11(float p) { return noise11(p) * 0.5 + noise11(p * 2.0) * 0.25 + noise11(p * 5.0) * 0.125; }

    vec3 noise31(float p) { return vec3(noise11(p), noise11(p + 18.952), noise11(p - 11.372)) * 2.0 - 1.0; }

    // something that looks a bit like godrays coming from the surface
    float sky(vec3 p) {
        float a = atan(p.x, p.z);
        float t = time * 0.1;
        float v =
            rand11(floor(a * 4.0 + t)) * 0.5 + rand11(floor(a * 8.0 - t)) * 0.25 + rand11(floor(a * 16.0 + t)) * 0.125;
        return v;
    }

    vec3 voronoi(in vec2 x) {
        vec2 n = floor(x);  // grid cell id
        vec2 f = fract(x);  // grid internal position
        vec2 mg;            // shortest distance...
        vec2 mr;            // ..and second shortest distance
        float md  = 8.0;
        float md2 = 8.0;
        for (int j = -1; j <= 1; j++)
        {
            for (int i = -1; i <= 1; i++)
            {
                vec2 g = vec2(float(i), float(j));  // cell id
                vec2 o = rand22(n + g);             // offset to edge point
                vec2 r = g + o - f;

                float d = max(abs(r.x), abs(r.y));  // distance to the edge

                if (d < md)
                {
                    md2 = md;
                    md  = d;
                    mr  = r;
                    mg  = g;
                }
                else if (d < md2)
                {
                    md2 = d;
                }
            }
        }
        return vec3(n + mg, md2 - md);
    }

    //#define A2V(a) vec2(sin((a) * 6.28318531 / 100.0), cos((a) * 6.28318531 / 100.0))
    vec2 A2V(float a) { return vec2(sin((a)*6.28318531 / 100.0), cos((a)*6.28318531 / 100.0)); }

    float circles(vec2 p) {
        float v;
        float w;
        float l;
        float c;
        vec2 pp;
        l = length(p);

        pp = rotate(p, time * 3.0);
        c  = max(dot(pp, normalize(vec2(-0.2, 0.5))), -dot(pp, normalize(vec2(0.2, 0.5))));
        c  = min(c, max(dot(pp, normalize(vec2(0.5, -0.5))), -dot(pp, normalize(vec2(0.2, -0.5)))));
        c  = min(c, max(dot(pp, normalize(vec2(0.3, 0.5))), -dot(pp, normalize(vec2(0.2, 0.5)))));

        // innerest stuff
        v = abs(l - 0.5) - 0.03;
        v = max(v, -c);
        v = min(v, abs(l - 0.54) - 0.02);
        v = min(v, abs(l - 0.64) - 0.05);

        pp = rotate(p, time * -1.333);
        c  = max(dot(pp, A2V(-5.0)), -dot(pp, A2V(5.0)));
        c  = min(c, max(dot(pp, A2V(25.0 - 5.0)), -dot(pp, A2V(25.0 + 5.0))));
        c  = min(c, max(dot(pp, A2V(50.0 - 5.0)), -dot(pp, A2V(50.0 + 5.0))));
        c  = min(c, max(dot(pp, A2V(75.0 - 5.0)), -dot(pp, A2V(75.0 + 5.0))));

        w = abs(l - 0.83) - 0.09;
        v = min(v, max(w, c));

        return v;
    }

    float shade1(float d) {
        float v = 1.0 - smoothstep(0.0, mix(0.012, 0.2, 0.0), d);
        float g = exp(d * -20.0);
        return v + g * 0.5;
    }

    void main() {
        vec2 uv = gl_FragCoord.xy / iResolution.xy;
        uv      = uv * 2.0 - 1.0;
        uv.x *= iResolution.x / iResolution.y;

        // using an iq styled camera this time :)
        // ray origin
        vec3 ro = 0.7 * vec3(cos(0.2 * time), 0.0, sin(0.2 * time));
        ro.y    = cos(0.6 * time) * 0.3 + 0.65;
        // camera look at
        vec3 ta = vec3(0.0, 0.2, 0.0);

        // camera shake intensity
        float shake = clamp(3.0 * (1.0 - length(ro.yz)), 0.3, 1.0);
        float st    = mod(time, 10.0) * 143.0;

        // build camera matrix
        vec3 ww = normalize(ta - ro + noise31(st) * shake * 0.01);
        vec3 uu = normalize(cross(ww, normalize(vec3(0.0, 1.0, 0.2 * sin(time)))));
        vec3 vv = normalize(cross(uu, ww));
        // obtain ray direction
        vec3 rd = normalize(uv.x * uu + uv.y * vv + 1.0 * ww);

        // shaking and movement
        ro += noise31(-st) * shake * 0.015;
        ro.x += time * 2.0;

        float inten = 0.0;

        // background
        float sd = dot(rd, vec3(0.0, 1.0, 0.0));
        inten    = pow(1.0 - abs(sd), 20.0) + pow(sky(rd), 5.0) * step(0.0, rd.y) * 0.2;

        vec3 its;
        float v;
        float g;

        // voronoi floor layers
        for (int i = 0; i < 4; i++)
        {
            float layer = float(i);
            its = intersect(ro, rd, vec3(0.0, -5.0 - layer * 5.0, 0.0), vec3(1.0, 0.0, 0.0), vec3(0.0, 0.0, 1.0));
            if (its.x > 0.0)
            {
                vec3 vo = voronoi((its.yz) * 0.05 + 8.0 * rand21(float(i)));
                v       = exp(-100.0 * (vo.z - 0.02));

                float fx = 0.0;

                // add some special fx to lowest layer
                if (i == 3)
                {
                    float crd = 0.0;                           // fract(time * 0.2) * 50.0 - 25.0;
                    float fxi = cos(vo.x * 0.2 + time * 1.5);  // abs(crd - vo.x);
                    fx        = clamp(smoothstep(0.9, 1.0, fxi), 0.0, 0.9) * 1.0 * rand12(vo.xy);
                    fx *= exp(-3.0 * vo.z) * 2.0;
                }
                inten += v * 0.1 + fx;
            }
        }

        // draw the gates, 4 should be enough
        float gatex = floor(ro.x / 8.0 + 0.5) * 8.0 + 4.0;
        float go    = -16.0;
        for (int i = 0; i < 4; i++)
        {
            its = intersect(ro, rd, vec3(gatex + go, 0.0, 0.0), vec3(0.0, 1.0, 0.0), vec3(0.0, 0.0, 1.0));
            if (dot(its.yz, its.yz) < 2.0 && its.x > 0.0)
            {
                v = circles(its.yz);
                inten += shade1(v);
            }

            go += 8.0;
        }

        // draw the stream
        for (int j = 0; j < 20; j++)
        {
            float id = float(j);

            vec3 bp  = vec3(0.0, (rand11(id) * 2.0 - 1.0) * 0.25, 0.0);
            vec3 its = intersect(ro, rd, bp, vec3(1.0, 0.0, 0.0), vec3(0.0, 0.0, 1.0));

            if (its.x > 0.0)
            {
                vec2 pp   = its.yz;
                float spd = (1.0 + rand11(id) * 3.0) * 2.5;
                pp.y += time * spd;
                pp += (rand21(id) * 2.0 - 1.0) * vec2(0.3, 1.0);
                float rep = rand11(id) + 1.5;
                pp.y      = mod(pp.y, rep * 2.0) - rep;
                float d   = box(pp, vec2(0.02, 0.3), 0.1);
                float foc = 0.0;
                float v   = 1.0 - smoothstep(0.0, 0.03, abs(d) - 0.001);
                float g   = min(exp(d * -20.0), 2.0);

                inten += (v + g * 0.7) * 0.5;
            }
        }

        inten *= 0.4 + (sin(time) * 0.5 + 0.5) * 0.6;

    // find a color for the computed intensity
#ifdef GREEN_VERSION
        vec3 col = pow(vec3(inten), vec3(2.0, 0.15, 9.0));
#else
        vec3 col = pow(vec3(inten), 1.5 * vec3(0.15, 2.0, 9.0));
#endif

        gl_FragColor = vec4(col, 1.0);
    }

);