mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-11-14 22:43:53 +01:00
926 lines
27 KiB
GLSL
926 lines
27 KiB
GLSL
#extension GL_OES_standard_derivatives : enable
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//Inigo Quilez
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//Oh where would I be without you.
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#define MAX_SHAPES 16
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#define MAX_OP 32
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varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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const float EPSILON = 1e-5;
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const float PI = 3.14159265358979323846;
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const float SUBTEXTURE_SIZE = 1024.;
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const float TEXTURE_N = 8192. / SUBTEXTURE_SIZE;
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const float TEXTURE_S = TEXTURE_N * TEXTURE_N;
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const float TEXTURE_T = SUBTEXTURE_SIZE / 8192.;
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uniform sampler2D texture0;
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uniform sampler2D texture1;
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uniform sampler2D texture2;
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uniform sampler2D texture3;
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uniform int MAX_MARCHING_STEPS;
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uniform int operations[MAX_OP];
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uniform float opArgument[MAX_OP];
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uniform int opLength;
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///////////////////////////////////////////////////////////////////
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uniform int shapeAmount;
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uniform int shape[MAX_SHAPES] ;
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uniform vec3 size[MAX_SHAPES] ;
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uniform float radius[MAX_SHAPES] ;
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uniform float thickness[MAX_SHAPES] ;
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uniform float crop[MAX_SHAPES] ;
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uniform float angle[MAX_SHAPES] ;
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uniform float height[MAX_SHAPES] ;
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uniform vec2 radRange[MAX_SHAPES] ;
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uniform float sizeUni[MAX_SHAPES] ;
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uniform vec3 elongate[MAX_SHAPES] ;
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uniform float rounded[MAX_SHAPES] ;
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uniform vec4 corner[MAX_SHAPES] ;
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uniform vec2 size2D[MAX_SHAPES] ;
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uniform int sides[MAX_SHAPES] ;
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uniform vec3 waveAmp[MAX_SHAPES] ;
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uniform vec3 waveInt[MAX_SHAPES] ;
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uniform vec3 waveShift[MAX_SHAPES] ;
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uniform int twistAxis[MAX_SHAPES] ;
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uniform float twistAmount[MAX_SHAPES] ;
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uniform vec3 position[MAX_SHAPES] ;
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uniform vec3 rotation[MAX_SHAPES] ;
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uniform float objectScale[MAX_SHAPES] ;
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uniform int tileActive[MAX_SHAPES] ;
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uniform vec3 tileSize[MAX_SHAPES] ;
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uniform vec3 tileAmount[MAX_SHAPES] ;
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uniform vec3 tileShiftPos[MAX_SHAPES] ;
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uniform vec3 tileShiftRot[MAX_SHAPES] ;
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uniform float tileShiftSca[MAX_SHAPES] ;
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uniform vec4 diffuseColor[MAX_SHAPES] ;
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uniform float reflective[MAX_SHAPES] ;
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uniform int volumetric[MAX_SHAPES] ;
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uniform float volumeDensity[MAX_SHAPES] ;
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uniform int useTexture[MAX_SHAPES] ;
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uniform float textureScale[MAX_SHAPES] ;
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uniform float triplanar[MAX_SHAPES] ;
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///////////////////////////////////////////////////////////////////
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uniform vec3 camRotation;
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uniform float camScale;
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uniform float camRatio;
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uniform int ortho;
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uniform float fov;
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uniform float orthoScale;
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uniform vec2 viewRange;
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uniform float depthInt;
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uniform int drawBg;
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uniform vec4 background;
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uniform float ambientIntns;
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uniform vec3 lightPosition;
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uniform int useEnv;
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uniform int drawGrid;
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uniform float gridStep;
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uniform float gridScale;
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uniform float axisBlend;
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float influences[MAX_SHAPES];
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#region ////========== Transform ============
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mat3 rotateX(float dg) {
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float c = cos(radians(dg));
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float s = sin(radians(dg));
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return mat3(
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vec3(1, 0, 0),
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vec3(0, c, -s),
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vec3(0, s, c)
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);
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}
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mat3 rotateY(float dg) {
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float c = cos(radians(dg));
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float s = sin(radians(dg));
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return mat3(
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vec3( c, 0, s),
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vec3( 0, 1, 0),
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vec3(-s, 0, c)
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);
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}
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mat3 rotateZ(float dg) {
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float c = cos(radians(dg));
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float s = sin(radians(dg));
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return mat3(
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vec3(c, -s, 0),
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vec3(s, c, 0),
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vec3(0, 0, 1)
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);
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}
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mat3 inverse(mat3 m) {
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float a00 = m[0][0], a01 = m[0][1], a02 = m[0][2];
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float a10 = m[1][0], a11 = m[1][1], a12 = m[1][2];
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float a20 = m[2][0], a21 = m[2][1], a22 = m[2][2];
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float b01 = a22 * a11 - a12 * a21;
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float b11 = -a22 * a10 + a12 * a20;
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float b21 = a21 * a10 - a11 * a20;
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float det = a00 * b01 + a01 * b11 + a02 * b21;
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return mat3(b01, (-a22 * a01 + a02 * a21), (a12 * a01 - a02 * a11),
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b11, (a22 * a00 - a02 * a20), (-a12 * a00 + a02 * a10),
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b21, (-a21 * a00 + a01 * a20), (a11 * a00 - a01 * a10)) / det;
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}
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#endregion
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#region ////============= Util ==============
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float random (in vec3 st) { return fract(sin(dot(st + vec3(1.0534, 0.453, 1.678), vec3(12.9898, 78.233, 63.1076))) * 43758.5453123); }
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float round(float v) { return fract(v) >= 0.5? ceil(v) : floor(v); }
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vec3 round(vec3 v) { return vec3(round(v.x), round(v.y), round(v.z)); }
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float dot2( in vec2 v ) { return dot(v,v); }
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float dot2( in vec3 v ) { return dot(v,v); }
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float ndot( in vec2 a, in vec2 b ) { return a.x*b.x - a.y*b.y; }
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vec4 sampleTexture(int textureIndex, vec2 coord) {
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if(coord.x < 0. || coord.y < 0. || coord.x > 1. || coord.y > 1.) return vec4(0.);
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float i = float(textureIndex);
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float txIndex = floor(i / TEXTURE_S);
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float stcInd = i - txIndex * TEXTURE_S;
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float row = floor(stcInd / TEXTURE_N);
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float col = stcInd - row * TEXTURE_N;
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vec2 tx = vec2(col, row) * TEXTURE_T;
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vec2 sm = tx + coord * TEXTURE_T;
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if(txIndex == 0.) return texture2D(texture0, sm);
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else if(txIndex == 1.) return texture2D(texture1, sm);
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else if(txIndex == 2.) return texture2D(texture2, sm);
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else if(txIndex == 3.) return texture2D(texture3, sm);
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return texture2D(texture0, sm);
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}
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vec2 equirectangularUv(vec3 dir) {
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vec3 n = normalize(dir);
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return vec2((atan(n.x, n.z) / (PI * 2.)) + 0.5, 1. - acos(n.y) / PI);
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}
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vec4 blend(in vec4 bg, in vec4 fg) {
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float al = fg.a + bg.a * (1. - fg.a);
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if(al == 0.) return bg;
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vec4 res = ((fg * fg.a) + (bg * bg.a * (1. - fg.a))) / al;
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res.a = al;
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return res;
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}
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#endregion
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#region ////======== 2D Primitives ==========
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float sdRoundedBox( in vec2 p, in vec2 b, in vec4 r ) {
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r.xy = (p.x > 0.0)? r.xy : r.zw;
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r.x = (p.y > 0.0)? r.x : r.y;
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vec2 q = abs(p) - b + r.x;
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return min(max(q.x, q.y), 0.0) + length(max(q, 0.0)) - r.x;
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}
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float sdRegularPolygon(in vec2 p, in float r, in int n ) {
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// these 4 lines can be precomputed for a given shape
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float an = 3.141593 / float(n);
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vec2 acs = vec2(cos(an), sin(an));
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// reduce to first sector
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float bn = mod(atan(p.x, p.y), 2.0 * an) - an;
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p = length(p) * vec2(cos(bn), abs(sin(bn)));
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// line sdf
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p -= r * acs;
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p.y += clamp( -p.y, 0.0, r * acs.y);
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return length(p) * sign(p.x);
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}
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float sdPie( in vec2 p, in float angle, in float r ) {
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vec2 c = vec2(sin(angle), cos(angle));
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p.x = abs(p.x);
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float l = length(p) - r;
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float m = length(p - c * clamp(dot(p, c), 0.0, r)); // c=sin/cos of aperture
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return max(l, m * sign(c.y * p.x - c.x * p.y));
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}
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#endregion
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#region ////======== 3D Primitives ==========
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float sdPlane( vec3 p, vec3 n, float h ) {
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return dot(p,n) + h;
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}
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float sdBox( vec3 p, vec3 b ) {
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vec3 q = abs(p) - b;
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return length(max(q,0.0)) + min(max(q.x,max(q.y,q.z)),0.0);
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}
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float sdBoxFrame( vec3 p, vec3 b, float e ) {
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p = abs(p)-b;
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vec3 q = abs(p+e)-e;
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return min(min(
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length(max(vec3(p.x,q.y,q.z),0.0))+min(max(p.x,max(q.y,q.z)),0.0),
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length(max(vec3(q.x,p.y,q.z),0.0))+min(max(q.x,max(p.y,q.z)),0.0)),
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length(max(vec3(q.x,q.y,p.z),0.0))+min(max(q.x,max(q.y,p.z)),0.0));
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}
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//////////////////////////////////////////////////////////////////////////////////////////////
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float sdSphere(vec3 p, float radius) {
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return length(p) - radius;
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}
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float sdEllipsoid( vec3 p, vec3 r ) {
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float k0 = length(p/r);
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float k1 = length(p/(r*r));
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return k0*(k0-1.0)/k1;
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}
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float sdTorus( vec3 p, vec2 t ) {
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vec2 q = vec2(length(p.xz)-t.x,p.y);
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return length(q)-t.y;
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}
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// r is the sphere's radius, h is the plane's position
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float sdCutSphere( vec3 p, float r, float h ) {
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// sampling independent computations (only depend on shape)
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float w = sqrt(r*r-h*h);
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// sampling dependant computations
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vec2 q = vec2( length(p.xz), p.y );
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float s = max( (h-r)*q.x*q.x+w*w*(h+r-2.0*q.y), h*q.x-w*q.y );
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return (s<0.0) ? length(q)-r :
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(q.x<w) ? h - q.y :
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length(q-vec2(w,h));
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}
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// r = sphere's radius
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// h = cutting's plane's position
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// t = thickness
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float sdCutHollowSphere( vec3 p, float r, float h, float t ) {
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// sampling independent computations (only depend on shape)
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float w = sqrt(r*r-h*h);
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// sampling dependant computations
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vec2 q = vec2( length(p.xz), p.y );
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return ((h*q.x<w*q.y) ? length(q-vec2(w,h)) :
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abs(length(q)-r) ) - t;
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}
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float sdCappedTorus( vec3 p, float an, float ra, float rb) {
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vec2 sc = vec2(sin(an),cos(an));
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p.x = abs(p.x);
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float k = (sc.y*p.x>sc.x*p.y) ? dot(p.xy,sc) : length(p.xy);
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return sqrt( dot(p,p) + ra*ra - 2.0*ra*k ) - rb;
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}
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//////////////////////////////////////////////////////////////////////////////////////////////
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float sdCylinder( vec3 p, vec3 c ) {
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return length(p.xz-c.xy)-c.z;
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}
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float sdCappedCylinder( vec3 p, float h, float r ) {
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vec2 d = abs(vec2(length(p.xz),p.y)) - vec2(r,h);
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return min(max(d.x,d.y),0.0) + length(max(d,0.0));
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}
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float sdCapsule( vec3 p, vec3 a, vec3 b, float r ) {
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vec3 pa = p - a, ba = b - a;
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float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );
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return length( pa - ba*h ) - r;
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}
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float sdCone( vec3 p, float an, float h ) {
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vec2 c = vec2(sin(an),cos(an));
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// c is the sin/cos of the angle, h is height
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// Alternatively pass q instead of (c,h),
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// which is the point at the base in 2D
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vec2 q = h*vec2(c.x/c.y,-1.0);
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vec2 w = vec2( length(p.xz), p.y );
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vec2 a = w - q*clamp( dot(w,q)/dot(q,q), 0.0, 1.0 );
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vec2 b = w - q*vec2( clamp( w.x/q.x, 0.0, 1.0 ), 1.0 );
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float k = sign( q.y );
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float d = min(dot( a, a ),dot(b, b));
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float s = max( k*(w.x*q.y-w.y*q.x),k*(w.y-q.y) );
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return sqrt(d)*sign(s);
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}
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float sdCappedCone( vec3 p, float h, float r1, float r2 ) {
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vec2 q = vec2( length(p.xz), p.y );
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vec2 k1 = vec2(r2,h);
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vec2 k2 = vec2(r2-r1,2.0*h);
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vec2 ca = vec2(q.x-min(q.x,(q.y<0.0)?r1:r2), abs(q.y)-h);
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vec2 cb = q - k1 + k2*clamp( dot(k1-q,k2)/dot2(k2), 0.0, 1.0 );
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float s = (cb.x<0.0 && ca.y<0.0) ? -1.0 : 1.0;
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return s*sqrt( min(dot2(ca),dot2(cb)) );
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}
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float sdRoundCone( vec3 p, float h, float r1, float r2 ) {
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// sampling independent computations (only depend on shape)
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float b = (r1-r2)/h;
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float a = sqrt(1.0-b*b);
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// sampling dependant computations
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vec2 q = vec2( length(p.xz), p.y );
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float k = dot(q,vec2(-b,a));
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if( k<0.0 ) return length(q) - r1;
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if( k>a*h ) return length(q-vec2(0.0,h)) - r2;
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return dot(q, vec2(a,b) ) - r1;
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}
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float sdSolidAngle( vec3 p, float an, float ra ) {
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vec2 c = vec2(sin(an),cos(an));
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vec2 q = vec2( length(p.xz), p.y );
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float l = length(q) - ra;
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float m = length(q - c*clamp(dot(q,c),0.0,ra) );
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return max(l,m*sign(c.y*q.x-c.x*q.y));
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}
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//////////////////////////////////////////////////////////////////////////////////////////////
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float sdOctahedron( vec3 p, float s ) {
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p = abs(p);
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float m = p.x+p.y+p.z-s;
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vec3 q;
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if( 3.0*p.x < m ) q = p.xyz;
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else if( 3.0*p.y < m ) q = p.yzx;
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else if( 3.0*p.z < m ) q = p.zxy;
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else return m*0.57735027;
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float k = clamp(0.5*(q.z-q.y+s),0.0,s);
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return length(vec3(q.x,q.y-s+k,q.z-k));
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}
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float sdPyramid( vec3 p, float h ) {
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float m2 = h*h + 0.25;
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p.xz = abs(p.xz);
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p.xz = (p.z>p.x) ? p.zx : p.xz;
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p.xz -= 0.5;
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vec3 q = vec3( p.z, h*p.y - 0.5*p.x, h*p.x + 0.5*p.y);
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float s = max(-q.x,0.0);
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float t = clamp( (q.y-0.5*p.z)/(m2+0.25), 0.0, 1.0 );
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float a = m2*(q.x+s)*(q.x+s) + q.y*q.y;
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float b = m2*(q.x+0.5*t)*(q.x+0.5*t) + (q.y-m2*t)*(q.y-m2*t);
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float d2 = min(q.y,-q.x*m2-q.y*0.5) > 0.0 ? 0.0 : min(a,b);
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return sqrt( (d2+q.z*q.z)/m2 ) * sign(max(q.z,-p.y));
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}
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#endregion
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#region ////============ Modify =============
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vec4 opElongate( in vec3 p, in vec3 h ) {
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vec3 q = abs(p) - h;
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return vec4( max(q, 0.0), min(max(q.x, max(q.y, q.z)), 0.0) );
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}
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float opExtrusion( in vec3 p, in float h, in float df2d ) {
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vec2 w = vec2( df2d, abs(p.z) - h );
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return min(max(w.x, w.y), 0.0) + length(max(w, 0.0));
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}
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vec3 wave(vec3 amp, vec3 shift, vec3 inten, vec3 p) {
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p.x += sin(p.y * amp.y + shift.x * PI * 2.) * inten.x +
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sin(p.z * amp.z + shift.x * PI * 2.) * inten.x;
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p.y += sin(p.x * amp.x + shift.y * PI * 2.) * inten.y +
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sin(p.z * amp.z + shift.y * PI * 2.) * inten.y;
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p.z += sin(p.y * amp.y + shift.z * PI * 2.) * inten.z +
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sin(p.x * amp.x + shift.z * PI * 2.) * inten.z;
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return p;
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}
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vec3 twist(float amo, int axis, vec3 p) {
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float c = cos(amo * p[axis]);
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float s = sin(amo * p[axis]);
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mat2 m = mat2(c, -s, s, c);
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if(axis == 0) {
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vec2 q = m * p.yz;
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return vec3(p.x, q);
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} else if(axis == 1) {
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vec2 q = m * p.xz;
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return vec3(q.x, p.y, q.y);
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|
} else if(axis == 2) {
|
|
vec2 q = m * p.xy;
|
|
return vec3(q, p.z);
|
|
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region ////============ Combine =============
|
|
|
|
vec2 smin( float a, float b, float k ) {
|
|
float h = 1.0 - min( abs(a - b) / (4.0 * k), 1.0 );
|
|
float w = h * h;
|
|
float m = w * 0.5;
|
|
float s = w * k;
|
|
return (a < b) ? vec2(a - s, m) : vec2(b - s, 1.0 - m);
|
|
}
|
|
|
|
float opSmoothSubtraction( float d1, float d2, float k ) {
|
|
float h = clamp( 0.5 - 0.5 * (d2 + d1) / k, 0.0, 1.0 );
|
|
return mix( d2, -d1, h ) + k * h * (1.0 - h);
|
|
}
|
|
|
|
float opSmoothIntersection( float d1, float d2, float k ) {
|
|
float h = clamp( 0.5 - 0.5*(d2-d1)/k, 0.0, 1.0 );
|
|
return mix( d2, d1, h ) + k*h*(1.0-h);
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region ////=========== View Mod ============
|
|
|
|
vec3 tilePosition(vec3 amount, vec3 size, vec3 p) {
|
|
if(amount == vec3(0.))
|
|
return p - size * round(p / size);
|
|
return p - size * clamp(round(p / size), -amount, amount);
|
|
}
|
|
|
|
vec3 tileIndex(vec3 amount, vec3 size, vec3 p) {
|
|
if(amount == vec3(0.))
|
|
return size * round(p / size);
|
|
return size * clamp(round(p / size), -amount, amount);
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region ////=========== Texturing ============
|
|
|
|
vec4 boxmap( in int textureIndex, in vec3 p, in vec3 n, in float k ) {
|
|
// project+fetch
|
|
vec4 x = sampleTexture( textureIndex, fract(p.yz) );
|
|
vec4 y = sampleTexture( textureIndex, fract(p.zx) );
|
|
vec4 z = sampleTexture( textureIndex, fract(p.xy) );
|
|
|
|
// blend weights
|
|
vec3 w = pow( abs(n), vec3(k) );
|
|
// blend and return
|
|
return (x * w.x + y * w.y + z * w.z) / (w.x + w.y + w.z);
|
|
}
|
|
|
|
|
|
vec4 viewGrid(vec2 pos, float scale) {
|
|
vec2 coord = pos * scale; // use the scale variable to set the distance between the lines
|
|
vec2 derivative = fwidth(coord);
|
|
vec2 grid = abs(fract(coord - 0.5) - 0.5) / derivative;
|
|
float line = min(grid.x, grid.y);
|
|
float minimumy = min(derivative.y, 1.);
|
|
float minimumx = min(derivative.x, 1.);
|
|
vec4 color = vec4(.3, .3, .3, 1. - min(line, 1.));
|
|
|
|
// y axis
|
|
if(pos.x > -1. * minimumx / scale && pos.x < 1. * minimumx / scale)
|
|
color.y = 0.3 + axisBlend * 0.7;
|
|
// x axis
|
|
|
|
if(pos.y > -1. * minimumy / scale && pos.y < 1. * minimumy / scale)
|
|
color.x = 0.3 + axisBlend * 0.7;
|
|
return color;
|
|
}
|
|
|
|
#endregion
|
|
|
|
////========= Ray Marching ==========
|
|
|
|
float sceneSDF(int index, vec3 p) {
|
|
float d;
|
|
|
|
mat3 rx = rotateX(rotation[index].x);
|
|
mat3 ry = rotateY(rotation[index].y);
|
|
mat3 rz = rotateZ(rotation[index].z);
|
|
mat3 rotMatrix = rx * ry * rz;
|
|
mat3 irotMatrix = inverse(rotMatrix);
|
|
|
|
float sca = objectScale[index];
|
|
p -= position[index];
|
|
p = irotMatrix * p;
|
|
p /= sca;
|
|
|
|
p = wave(waveAmp[index], waveShift[index], waveInt[index], p);
|
|
|
|
if(tileActive[index] == 1) {
|
|
vec3 tindex = tileIndex(tileAmount[index], tileSize[index], p);
|
|
|
|
vec3 tpos = tileShiftPos[index] * (random(tindex + vec3(1., 0., 0.)) * 2. - 1.);
|
|
vec3 trot = tileShiftRot[index] * (random(tindex + vec3(0., 1., 0.)) * 2. - 1.);
|
|
float tsca = 1. + tileShiftSca[index] * (random(tindex + vec3(0., 0., 1.)) * 2. - 1.);
|
|
|
|
tindex += tpos;
|
|
p = p - tindex;
|
|
|
|
mat3 trx = rotateX(trot.x);
|
|
mat3 try = rotateY(trot.y);
|
|
mat3 trz = rotateZ(trot.z);
|
|
mat3 trotMatrix = rx * ry * rz;
|
|
mat3 tirotMatrix = inverse(trotMatrix);
|
|
|
|
sca *= tsca;
|
|
p /= tsca;
|
|
p = tirotMatrix * p;
|
|
}
|
|
|
|
p = twist(twistAmount[index], twistAxis[index], p);
|
|
|
|
vec4 el = vec4(0.);
|
|
|
|
if(elongate[index] != vec3(0.)) {
|
|
el = opElongate(p, elongate[index]);
|
|
p = el.xyz;
|
|
}
|
|
|
|
int shp = shape[index];
|
|
|
|
if(shp == 100) d = sdPlane( p, vec3(0., -1., 0.), 0.);
|
|
else if(shp == 101) d = sdBox( p, size[index] / 2.);
|
|
else if(shp == 102) d = sdBoxFrame( p, size[index] / 2., thickness[index]);
|
|
else if(shp == 103) d = opExtrusion( p, thickness[index], sdRoundedBox(p.xy, size2D[index], corner[index]));
|
|
|
|
else if(shp == 200) d = sdSphere( p, radius[index]);
|
|
else if(shp == 201) d = sdEllipsoid( p, size[index] / 2.);
|
|
else if(shp == 202) d = sdCutSphere( p, radius[index], crop[index]);
|
|
else if(shp == 203) d = sdCutHollowSphere( p, radius[index], crop[index], thickness[index]);
|
|
else if(shp == 204) d = sdTorus( p, vec2(radius[index], thickness[index]));
|
|
else if(shp == 205) d = sdCappedTorus( p, angle[index], radius[index], thickness[index]);
|
|
|
|
else if(shp == 300) d = sdCappedCylinder( p, height[index], radius[index]);
|
|
else if(shp == 301) d = sdCapsule( p, vec3(-height[index], 0., 0.), vec3(height[index], 0., 0.), radius[index]);
|
|
else if(shp == 302) d = sdCone( p, angle[index], height[index]);
|
|
else if(shp == 303) d = sdCappedCone( p, height[index], radRange[index].x, radRange[index].y);
|
|
else if(shp == 304) d = sdRoundCone( p, height[index], radRange[index].x, radRange[index].y);
|
|
else if(shp == 305) d = sdSolidAngle( p, angle[index], radius[index]);
|
|
else if(shp == 306) d = opExtrusion( p, thickness[index], sdRegularPolygon(p.xy, 0.5, sides[index]));
|
|
else if(shp == 307) d = opExtrusion( p, thickness[index], sdPie(p.xy, angle[index], radius[index]));
|
|
|
|
else if(shp == 400) d = sdOctahedron( p, sizeUni[index]);
|
|
else if(shp == 401) d = sdPyramid( p, sizeUni[index]);
|
|
|
|
if(elongate[index] != vec3(0.)) {
|
|
d += el.w;
|
|
}
|
|
|
|
d -= rounded[index];
|
|
d *= sca;
|
|
|
|
return d;
|
|
}
|
|
|
|
float operateSceneSDF(vec3 p, out vec3 blendIndx) {
|
|
blendIndx = vec3(0., 0., 1.);
|
|
|
|
if(operations[0] == -1) {
|
|
influences[0] = 1.;
|
|
return sceneSDF(0, p);
|
|
}
|
|
|
|
float depth[MAX_OP];
|
|
int index[MAX_OP];
|
|
|
|
float d1, d2, mrg;
|
|
int o1, o2;
|
|
int top = 0;
|
|
int opr = 0;
|
|
|
|
for(int i = 0; i < opLength; i++) {
|
|
opr = operations[i];
|
|
mrg = opArgument[i];
|
|
|
|
if(opr < 100) {
|
|
depth[top] = sceneSDF(opr, p);
|
|
index[top] = opr;
|
|
top++;
|
|
|
|
} else if(top >= 2) {
|
|
top--;
|
|
d1 = depth[top];
|
|
o1 = index[top];
|
|
|
|
top--;
|
|
d2 = depth[top];
|
|
o2 = index[top];
|
|
|
|
if(opr == 100) {
|
|
if(d1 < d2) {
|
|
depth[top] = d1;
|
|
index[top] = o1;
|
|
blendIndx.x = float(o1);
|
|
|
|
influences[o1] = 1.;
|
|
influences[o2] = 0.;
|
|
|
|
} else {
|
|
depth[top] = d2;
|
|
index[top] = o2;
|
|
blendIndx.x = float(o2);
|
|
|
|
influences[o1] = 0.;
|
|
influences[o2] = 1.;
|
|
|
|
}
|
|
|
|
} else if(opr == 101) {
|
|
vec2 m = smin(d1, d2, mrg);
|
|
blendIndx.x = float(o1);
|
|
blendIndx.y = float(o2);
|
|
blendIndx.z = m.y;
|
|
|
|
influences[o1] = 1. - m.y;
|
|
influences[o2] = m.y;
|
|
|
|
depth[top] = m.x;
|
|
index[top] = d1 < d2? o1 : o2;
|
|
|
|
} else if(opr == 102) {
|
|
float m = opSmoothSubtraction(d1, d2, mrg);
|
|
blendIndx.x = float(o2);
|
|
|
|
influences[o1] = 0.;
|
|
influences[o2] = 1.;
|
|
|
|
depth[top] = m;
|
|
index[top] = o2;
|
|
|
|
} else if(opr == 103) {
|
|
float m = opSmoothIntersection(d1, d2, mrg);
|
|
blendIndx.x = float(o1);
|
|
|
|
influences[o1] = 1.;
|
|
influences[o2] = 0.;
|
|
|
|
depth[top] = m;
|
|
index[top] = o1;
|
|
|
|
}
|
|
|
|
top++;
|
|
|
|
} else //error, not enough values
|
|
break;
|
|
}
|
|
|
|
return depth[0];
|
|
}
|
|
|
|
vec3 normal(vec3 p) {
|
|
vec3 b;
|
|
|
|
vec2 e = vec2(1.0, -1.0) * 0.0001;
|
|
return normalize( e.xyy * operateSceneSDF( p + e.xyy, b ) +
|
|
e.yyx * operateSceneSDF( p + e.yyx, b ) +
|
|
e.yxy * operateSceneSDF( p + e.yxy, b ) +
|
|
e.xxx * operateSceneSDF( p + e.xxx, b ) );
|
|
|
|
}
|
|
|
|
float march(vec3 camera, vec3 direction, out vec3 blendIndx) {
|
|
if(shapeAmount == 0) return viewRange.y;
|
|
float depth = viewRange.x;
|
|
|
|
for (int i = 0; i < MAX_MARCHING_STEPS; i++) {
|
|
float dist = operateSceneSDF(camera + depth * direction, blendIndx);
|
|
if (dist < EPSILON)
|
|
return depth;
|
|
|
|
depth += dist;
|
|
if (depth >= viewRange.y)
|
|
return viewRange.y;
|
|
}
|
|
|
|
return viewRange.y;
|
|
}
|
|
|
|
float marchLinear(vec3 camera, vec3 direction, out vec3 blendIndx) {
|
|
float st = 1. / float(MAX_MARCHING_STEPS);
|
|
|
|
for (int i = 0; i <= MAX_MARCHING_STEPS; i++) {
|
|
float depth = mix(viewRange.x, viewRange.y, float(i) * st);
|
|
vec3 pos = camera + depth * direction;
|
|
float hit = operateSceneSDF(pos, blendIndx);
|
|
|
|
if (hit <= 0.)
|
|
return depth;
|
|
}
|
|
|
|
return viewRange.y;
|
|
}
|
|
|
|
float marchDensity(vec3 camera, vec3 direction) {
|
|
float maxx = float(MAX_MARCHING_STEPS);
|
|
float st = 1. / maxx;
|
|
float density = 0.;
|
|
float dens, stp;
|
|
vec3 blendIndx;
|
|
|
|
for (float i = 0.; i <= maxx; i++) {
|
|
float depth = mix(viewRange.x, viewRange.y, i * st);
|
|
vec3 pos = camera + depth * direction;
|
|
float hit = operateSceneSDF(pos, blendIndx);
|
|
|
|
if (hit <= 0.) {
|
|
dens = volumeDensity[int(floor(blendIndx.x))];
|
|
stp = dens == 0. ? 0. : pow(2., 10. * dens - 10.);
|
|
|
|
density += stp;
|
|
}
|
|
}
|
|
|
|
return density;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
vec4 scene() {
|
|
mat3 rx = rotateX(camRotation.x);
|
|
mat3 ry = rotateY(camRotation.y);
|
|
mat3 rz = rotateZ(camRotation.z);
|
|
mat3 camRotMatrix = rx * ry * rz;
|
|
mat3 camIrotMatrix = inverse(camRotMatrix);
|
|
|
|
vec3 dir, eye;
|
|
|
|
vec2 cps = (v_vTexcoord - .5) * 2.;
|
|
cps.x *= camRatio;
|
|
|
|
if(ortho == 0) {
|
|
float dz = 1. / tan(radians(fov) / 2.);
|
|
|
|
dir = vec3(cps, -dz);
|
|
eye = vec3(0., 0., 5.);
|
|
|
|
} else if(ortho == 1) {
|
|
|
|
dir = vec3(0., 0., -1.);
|
|
eye = vec3(cps * orthoScale, 5.);
|
|
}
|
|
|
|
dir = normalize(camIrotMatrix * dir);
|
|
eye = camIrotMatrix * eye;
|
|
eye /= camScale;
|
|
|
|
if(volumetric[0] == 1) {
|
|
float _dens = clamp(marchDensity(eye, dir), 0., 1.);
|
|
return diffuseColor[0] * _dens;
|
|
}
|
|
|
|
vec3 blendIndx;
|
|
float depth = march(eye, dir, blendIndx);
|
|
|
|
int idx0 = int(floor(blendIndx.x));
|
|
int idx1 = int(floor(blendIndx.y));
|
|
float rat = blendIndx.z;
|
|
|
|
vec3 coll = eye + dir * depth;
|
|
vec3 norm = normal(coll);
|
|
vec4 grid = vec4(0.);
|
|
|
|
if(drawGrid == 1 && (shapeAmount == 0 || sign(eye.y) != sign(coll.y))) {
|
|
vec3 gp = eye + dir * depth * (abs(eye.y) / (abs(coll.y) + abs(eye.y)));
|
|
grid = viewGrid( gp.xz, gridStep );
|
|
grid.a *= clamp(1. - length(gp.xz) * gridScale, 0., 1.) * 0.75;
|
|
}
|
|
|
|
if(shapeAmount == 0 || depth > viewRange.y - EPSILON) // Not hitting anything.
|
|
return drawGrid == 1? grid : vec4(0.);
|
|
|
|
///////////////////////////////////////////////////////////
|
|
|
|
float totalInfluences = 0.;
|
|
for(int i = 0; i < shapeAmount; i++)
|
|
totalInfluences += influences[i];
|
|
|
|
vec3 c = vec3(0.);
|
|
float refl = 0.;
|
|
|
|
if(totalInfluences > 0.) {
|
|
for(int i = 0; i < shapeAmount; i++) {
|
|
if(influences[i] == 0.) continue;
|
|
|
|
rx = rotateX(rotation[i].x);
|
|
ry = rotateY(rotation[i].y);
|
|
rz = rotateZ(rotation[i].z);
|
|
mat3 rotMatrix = rx * ry * rz;
|
|
mat3 irotMatrix = inverse(rotMatrix);
|
|
|
|
vec3 _c = useTexture[i] == 1?
|
|
boxmap(int(TEXTURE_S) + i, irotMatrix * coll * textureScale[i], irotMatrix * norm, triplanar[i]).rgb * diffuseColor[i].rgb :
|
|
diffuseColor[i].rgb;
|
|
|
|
c += _c * (influences[i] / totalInfluences);
|
|
refl += reflective[i] * (influences[i] / totalInfluences);
|
|
}
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////
|
|
|
|
float distNorm = (depth - viewRange.x) / (viewRange.y - viewRange.x);
|
|
distNorm = 1. - distNorm;
|
|
distNorm = smoothstep(.0, .3, distNorm);
|
|
c = mix(c * background.rgb, c, mix(1., distNorm, depthInt));
|
|
|
|
///////////////////////////////////////////////////////////
|
|
|
|
if(useEnv == 1) {
|
|
vec3 ref = reflect(dir, norm);
|
|
vec4 refC = sampleTexture(0, equirectangularUv(ref));
|
|
c = mix(c, c * refC.rgb, refl);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////
|
|
|
|
vec3 light = normalize(lightPosition);
|
|
float lamo = min(1., max(0., dot(norm, light)) + ambientIntns);
|
|
c = mix(c * background.rgb, c, lamo);
|
|
|
|
///////////////////////////////////////////////////////////
|
|
|
|
vec4 res = vec4(c, 1.);
|
|
|
|
if(drawGrid == 1 && sign(eye.y) != sign(coll.y))
|
|
res = blend(res, grid);
|
|
|
|
return res;
|
|
}
|
|
|
|
void main() {
|
|
|
|
vec4 bg = background;
|
|
if(useEnv == 1) {
|
|
// float edz = 1. / tan(radians(fov * 2.) / 2.);
|
|
// vec3 edir = normalize(vec3((v_vTexcoord - .5) * 2., -edz));
|
|
|
|
mat3 rx = rotateX(camRotation.x);
|
|
mat3 ry = rotateY(camRotation.y);
|
|
mat3 rz = rotateZ(camRotation.z);
|
|
mat3 camRotMatrix = rx * ry * rz;
|
|
mat3 camIrotMatrix = inverse(camRotMatrix);
|
|
|
|
vec3 dir;
|
|
vec2 cps = (v_vTexcoord - .5) * 2.;
|
|
cps.x *= camRatio;
|
|
|
|
if(ortho == 0) {
|
|
float dz = 1. / tan(radians(fov) / 2.);
|
|
dir = vec3(cps, -dz);
|
|
|
|
} else if(ortho == 1) {
|
|
dir = vec3(0., 0., -1.);
|
|
}
|
|
|
|
dir = normalize(camIrotMatrix * dir);
|
|
|
|
vec2 envUV = equirectangularUv(dir);
|
|
vec4 endC = sampleTexture(0, envUV);
|
|
bg = endC;
|
|
}
|
|
|
|
vec4 result = drawBg == 1? bg : vec4(0.);
|
|
result = blend(result, scene());
|
|
|
|
//////////////////////////////////////////////////
|
|
|
|
gl_FragColor = result;
|
|
} |