hostsidetests/sustainedperf/shadertoy_android/jni/shaders.cpp

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <string>

std::string g_shader = R"(

// various noise functions
float Hash2d(vec2 uv)
{
    float f = uv.x + uv.y * 47.0;
    return fract(cos(f*3.333)*100003.9);
}
float Hash3d(vec3 uv)
{
    float f = uv.x + uv.y * 37.0 + uv.z * 521.0;
    return fract(cos(f*3.333)*100003.9);
}
float mixP(float f0, float f1, float a)
{
    return mix(f0, f1, a*a*(3.0-2.0*a));
}
const vec2 zeroOne = vec2(0.0, 1.0);
float noise2d(vec2 uv)
{
    vec2 fr = fract(uv.xy);
    vec2 fl = floor(uv.xy);
    float h00 = Hash2d(fl);
    float h10 = Hash2d(fl + zeroOne.yx);
    float h01 = Hash2d(fl + zeroOne);
    float h11 = Hash2d(fl + zeroOne.yy);
    return mixP(mixP(h00, h10, fr.x), mixP(h01, h11, fr.x), fr.y);
}
float noise2dT(vec2 uv)
{
    vec2 fr = fract(uv);
    vec2 smooth = fr*fr*(3.0-2.0*fr);
    vec2 fl = floor(uv);
    uv = smooth + fl;
    return texture2D(iChannel0, (uv + 0.5)/iChannelResolution[0].xy).y; // use constant here instead?
}
float noise(vec3 uv)
{
    vec3 fr = fract(uv.xyz);
    vec3 fl = floor(uv.xyz);
    float h000 = Hash3d(fl);
    float h100 = Hash3d(fl + zeroOne.yxx);
    float h010 = Hash3d(fl + zeroOne.xyx);
    float h110 = Hash3d(fl + zeroOne.yyx);
    float h001 = Hash3d(fl + zeroOne.xxy);
    float h101 = Hash3d(fl + zeroOne.yxy);
    float h011 = Hash3d(fl + zeroOne.xyy);
    float h111 = Hash3d(fl + zeroOne.yyy);
    return mixP(
        mixP(mixP(h000, h100, fr.x), mixP(h010, h110, fr.x), fr.y),
        mixP(mixP(h001, h101, fr.x), mixP(h011, h111, fr.x), fr.y)
        , fr.z);
}

float PI=3.14159265;

vec3 saturate(vec3 a)
{
    return clamp(a, 0.0, 1.0);
}
vec2 saturate(vec2 a)
{
    return clamp(a, 0.0, 1.0);
}
float saturate(float a)
{
    return clamp(a, 0.0, 1.0);
}

float Density(vec3 p)
{
    //float ws = 0.06125*0.125;
    //vec3 warp = vec3(noise(p*ws), noise(p*ws + 111.11), noise(p*ws + 7111.11));
    float final = noise(p*0.06125);// + sin(iGlobalTime)*0.5-1.95 + warp.x*4.0;
    float other = noise(p*0.06125 + 1234.567);
    other -= 0.5;
    final -= 0.5;
    final = 0.1/(abs(final*final*other));
    final += 0.5;
    return final*0.0001;
}

void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
    // ---------------- First, set up the camera rays for ray marching ----------------
    vec2 uv = fragCoord.xy/iResolution.xy * 2.0 - 1.0;// - 0.5;

    // Camera up vector.
    vec3 camUp=vec3(0,1,0); // vuv

    // Camera lookat.
    vec3 camLookat=vec3(0,0.0,0);   // vrp

    float mx=iMouse.x/iResolution.x*PI*2.0 + iGlobalTime * 0.01;
    float my=-iMouse.y/iResolution.y*10.0 + sin(iGlobalTime * 0.03)*0.2+0.2;//*PI/2.01;
    vec3 camPos=vec3(cos(my)*cos(mx),sin(my),cos(my)*sin(mx))*(200.2);  // prp

    // Camera setup.
    vec3 camVec=normalize(camLookat - camPos);//vpn
    vec3 sideNorm=normalize(cross(camUp, camVec));  // u
    vec3 upNorm=cross(camVec, sideNorm);//v
    vec3 worldFacing=(camPos + camVec);//vcv
    vec3 worldPix = worldFacing + uv.x * sideNorm * (iResolution.x/iResolution.y) + uv.y * upNorm;//scrCoord
    vec3 relVec = normalize(worldPix - camPos);//scp

    // --------------------------------------------------------------------------------
    float t = 0.0;
    float inc = 0.02;
    float maxDepth = 70.0;
    vec3 pos = vec3(0,0,0);
    float density = 0.0;
    // ray marching time
    for (int i = 0; i < 37; i++)    // This is the count of how many times the ray actually marches.
    {
        if ((t > maxDepth)) break;
        pos = camPos + relVec * t;
        float temp = Density(pos);
        //temp *= saturate(t-1.0);

        inc = 1.9 + temp*0.05;  // add temp because this makes it look extra crazy!
        density += temp * inc;
        t += inc;
    }

    // --------------------------------------------------------------------------------
    // Now that we have done our ray marching, let's put some color on this.
    vec3 finalColor = vec3(0.01,0.1,1.0)* density*0.2;

    // output the final color with sqrt for "gamma correction"
    fragColor = vec4(sqrt(clamp(finalColor, 0.0, 1.0)),1.0);
}


)";