229 lines
7.5 KiB
GLSL
229 lines
7.5 KiB
GLSL
/*
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MIT License
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Copyright (c) 2022 railgunSR
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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/*
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THIS MAKES USE OF OPENSIMPLEX2, A NOISE ALGORITHM CREATED BY THE FINE FOLKS
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OVER AT https://github.com/KdotJPG/OpenSimplex2
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PLEASE GIVE THEM SOME LOVE.
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THE FLAME FUNCTION IS ONE CREATED BY ME BLENDING A LOG2 INTO A EXPONENTIAL.
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*/
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//version
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#version 330 core
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//macros
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#extension GL_ARB_explicit_uniform_location : enable
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//output
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out vec4 fragColor;
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//input
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in vec3 FragPos;
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in vec3 Normal;
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in vec2 TexCoord;
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in vec4 projCoord;
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in vec4 modelCoord;
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//uniforms
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uniform float time;
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//layout uniforms
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layout (location = 5) uniform sampler2D volumeDepthFrontface;
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layout (location = 6) uniform sampler2D volumeDepthBackface;
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//function declarations
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vec4 openSimplex2_Conventional(vec3 X);
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vec4 openSimplex2_ImproveXY(vec3 X);
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float flameTex(float x, float y);
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float getNoise(float scale, float timeScale);
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/*
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Main method
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*/
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void main(){
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float timeS = time * 0.01;
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// Normalized pixel coordinates (from 0 to 1)
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vec3 projCoordNorm = projCoord.xyz / projCoord.w / 2.0 + 0.5;
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//make vec2
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vec2 finalProd = projCoordNorm.xy;
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//grab depth values
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float closeDepth = texture(volumeDepthFrontface, finalProd.xy).r;
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float farDepth = texture(volumeDepthBackface, finalProd.xy).r;
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//distance between the two
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float volume = abs(farDepth - closeDepth);
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//based on distance of model coords from center
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float dist = length(modelCoord.xyz);
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//noise
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// float noiseInX = modelCoord.x * 7.0;
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// float noiseInZ = FragPos.y * 7.0 - timeS;
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// float noiseInY = modelCoord.y * 7.0;
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// float noise = openSimplex2_ImproveXY(vec3(noiseInX,noiseInY,noiseInZ)).x;
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float noise = (getNoise(7.0,1.5 * timeS) + getNoise(10.0,1.5 * (timeS + 0.1)) + getNoise(14.0,1.5 * (timeS + 0.2)) + getNoise(20.0,3.0 * timeS)) / 4.0;
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// float noise = getNoise(10.0,1.5);
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// float noise = getNoise(14.0,2.0);
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float vertical = -modelCoord.z;
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float amountOfFire = volume * 50.0 + vertical * 2.0 + noise * 0.1;// + dist * 0.1; //should be a function of volume + noise + dist from center
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// if(amountOfFire < 0.1){
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// discard;
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// }
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amountOfFire = amountOfFire * 2.0;
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float red = amountOfFire * 2.0;
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float green = amountOfFire * 0.8;
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float blue = amountOfFire * 0.2;
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float alpha = amountOfFire * 3.0;
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vec4 color = vec4(
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red,
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green,
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blue,
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alpha
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);
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// if(val < 0.3){
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// discard;
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// }
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// Output to screen
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fragColor = color;
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}
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float getNoise(float scale, float time){
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float noiseInX = modelCoord.x * scale;
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float noiseInZ = FragPos.y * scale - time;
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float noiseInY = modelCoord.y * scale;
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float noise = openSimplex2_ImproveXY(vec3(noiseInX,noiseInY,noiseInZ)).x;
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return noise;
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}
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//////////////// K.jpg's Re-oriented 4-Point BCC Noise (OpenSimplex2) ////////////////
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////////////////////// Output: vec4(dF/dx, dF/dy, dF/dz, value) //////////////////////
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// Inspired by Stefan Gustavson's noise
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vec4 permute(vec4 t) {
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return t * (t * 34.0 + 133.0);
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}
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// Gradient set is a normalized expanded rhombic dodecahedron
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vec3 grad(float hash) {
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// Random vertex of a cube, +/- 1 each
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vec3 cube = mod(floor(hash / vec3(1.0, 2.0, 4.0)), 2.0) * 2.0 - 1.0;
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// Random edge of the three edges connected to that vertex
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// Also a cuboctahedral vertex
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// And corresponds to the face of its dual, the rhombic dodecahedron
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vec3 cuboct = cube;
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cuboct[int(hash / 16.0)] = 0.0;
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// In a funky way, pick one of the four points on the rhombic face
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float type = mod(floor(hash / 8.0), 2.0);
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vec3 rhomb = (1.0 - type) * cube + type * (cuboct + cross(cube, cuboct));
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// Expand it so that the new edges are the same length
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// as the existing ones
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vec3 grad = cuboct * 1.22474487139 + rhomb;
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// To make all gradients the same length, we only need to shorten the
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// second type of vector. We also put in the whole noise scale constant.
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// The compiler should reduce it into the existing floats. I think.
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grad *= (1.0 - 0.042942436724648037 * type) * 32.80201376986577;
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return grad;
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}
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// BCC lattice split up into 2 cube lattices
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vec4 openSimplex2Base(vec3 X) {
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// First half-lattice, closest edge
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vec3 v1 = round(X);
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vec3 d1 = X - v1;
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vec3 score1 = abs(d1);
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vec3 dir1 = step(max(score1.yzx, score1.zxy), score1);
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vec3 v2 = v1 + dir1 * sign(d1);
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vec3 d2 = X - v2;
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// Second half-lattice, closest edge
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vec3 X2 = X + 144.5;
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vec3 v3 = round(X2);
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vec3 d3 = X2 - v3;
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vec3 score2 = abs(d3);
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vec3 dir2 = step(max(score2.yzx, score2.zxy), score2);
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vec3 v4 = v3 + dir2 * sign(d3);
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vec3 d4 = X2 - v4;
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// Gradient hashes for the four points, two from each half-lattice
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vec4 hashes = permute(mod(vec4(v1.x, v2.x, v3.x, v4.x), 289.0));
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hashes = permute(mod(hashes + vec4(v1.y, v2.y, v3.y, v4.y), 289.0));
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hashes = mod(permute(mod(hashes + vec4(v1.z, v2.z, v3.z, v4.z), 289.0)), 48.0);
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// Gradient extrapolations & kernel function
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vec4 a = max(0.5 - vec4(dot(d1, d1), dot(d2, d2), dot(d3, d3), dot(d4, d4)), 0.0);
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vec4 aa = a * a; vec4 aaaa = aa * aa;
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vec3 g1 = grad(hashes.x); vec3 g2 = grad(hashes.y);
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vec3 g3 = grad(hashes.z); vec3 g4 = grad(hashes.w);
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vec4 extrapolations = vec4(dot(d1, g1), dot(d2, g2), dot(d3, g3), dot(d4, g4));
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// Derivatives of the noise
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vec3 derivative = -8.0 * mat4x3(d1, d2, d3, d4) * (aa * a * extrapolations)
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+ mat4x3(g1, g2, g3, g4) * aaaa;
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// Return it all as a vec4
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return vec4(derivative, dot(aaaa, extrapolations));
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}
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// Use this if you don't want Z to look different from X and Y
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vec4 openSimplex2_Conventional(vec3 X) {
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// Rotate around the main diagonal. Not a skew transform.
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vec4 result = openSimplex2Base(dot(X, vec3(2.0/3.0)) - X);
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return vec4(dot(result.xyz, vec3(2.0/3.0)) - result.xyz, result.w);
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}
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// Use this if you want to show X and Y in a plane, then use Z for time, vertical, etc.
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vec4 openSimplex2_ImproveXY(vec3 X) {
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// Rotate so Z points down the main diagonal. Not a skew transform.
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mat3 orthonormalMap = mat3(
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0.788675134594813, -0.211324865405187, -0.577350269189626,
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-0.211324865405187, 0.788675134594813, -0.577350269189626,
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0.577350269189626, 0.577350269189626, 0.577350269189626);
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vec4 result = openSimplex2Base(orthonormalMap * X);
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return vec4(result.xyz * orthonormalMap, result.w);
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}
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//////////////////////////////// End noise code //////////////////////////////// |