diff options
Diffstat (limited to 'main.js')
| -rw-r--r-- | main.js | 93 |
1 files changed, 91 insertions, 2 deletions
@@ -5,7 +5,7 @@ let settings = { brightness: {}, saturate: {}, contrast: {}, - blur: {filter: value => value * canvas.width / 100 + 'px'} + blur: { filter: value => value * canvas.width / 100 + 'px' } }; const img = new Image(); @@ -80,9 +80,65 @@ function settings_apply(event) { draw(true); } +function length(vec) { + return Math.sqrt(vec.reduce((acc, e) => acc + e * e, 0)) +} +function mul(vec, scalar) { + return vec.map(e => e * scalar); +} +function add(vec_a, vec_b) { + return vec_a.map((e, i) => e + vec_b[i]); +} +function mix(vec_x, vec_y, scalar) { + return add(mul(vec_x, 1 - scalar), mul(vec_y, scalar)); +} + +// https://www.shadertoy.com/view/ldSXWK +function lensflare(uv, pos) { + const intensity = 1.5; + // const main = add(uv, mul(pos, -1)); + const uvd = mul(uv, length(uv)); + + // let dist = length(main); dist = Math.pow(dist, .1); + + // const f1 = max(0.01-Math.pow(length(add(uv,mul(pos,1.2))),1.9),.0)*7.0; + + const f2 = Math.max(1.0 / (1.0 + 32.0 * Math.pow(length(add(uvd, mul(pos, 0.8))), 2.0)), .0) * 0.1; + const f22 = Math.max(1.0 / (1.0 + 32.0 * Math.pow(length(add(uvd, mul(pos, 0.85))), 2.0)), .0) * 0.08; + const f23 = Math.max(1.0 / (1.0 + 32.0 * Math.pow(length(add(uvd, mul(pos, 0.9))), 2.0)), .0) * 0.06; + + let uvx = mix(uv, uvd, -0.5); + + const f4 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.4))), 2.4), .0) * 6.0; + const f42 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.45))), 2.4), .0) * 5.0; + const f43 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.5))), 2.4), .0) * 3.0; + + uvx = mix(uv, uvd, -.4); + + const f5 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.2))), 5.5), .0) * 2.0; + const f52 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.4))), 5.5), .0) * 2.0; + const f53 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.6))), 5.5), .0) * 2.0; + + uvx = mix(uv, uvd, -0.5); + + const f6 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, -0.3))), 1.6), .0) * 6.0; + const f62 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, -0.325))), 1.6), .0) * 3.0; + const f63 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, -0.35))), 1.6), .0) * 5.0; + + let c = [ + f2 + f4 + f5 + f6, + f22 + f42 + f52 + f62, + f23 + f43 + f53 + f63 + ]; + + c = mul(c, 1.3).map(e => e - length(uvd) * .05); + + return mul(c, intensity); +} + function draw(viewport_scale) { const filter = Object.entries(settings) - .map(([setting, {elements, filter}]) => `${setting}(${filter(elements[0].value)})`) + .map(([setting, { elements, filter }]) => `${setting}(${filter(elements[0].value)})`) .join(" ") // set the resolution to the original and then scale down to the viewport to @@ -96,5 +152,38 @@ function draw(viewport_scale) { ctx.filter = filter console.log(filter); ctx.drawImage(img, 0, 0, canvas.width, canvas.height); + ctx.filter = ''; + + // for (let y = 0; y < canvas.height; y++) { + // for (let x = 0; x < canvas.width; x++) { + // let uv = [x / canvas.width, y / canvas.height]; + // // uv[0] *= canvas.width / canvas.height; + // // let color = lensflare(uv, [.5,.5]); + // ctx.fillStyle = `rgb(${[...uv,0].map(e => Math.floor(e * 255)).join()})`; + // ctx.fillRect(x,y,1,1); + // } + // } + + var imgdata = ctx.getImageData(0, 0, canvas.width, canvas.height); + const pixel_count = imgdata.data.length / 4; + for (let i = 0; i < pixel_count; i++) { + let x = i % canvas.width; + let y = i / canvas.width; + let u = (x / canvas.width - .5) * canvas.width / canvas.height; + let v = y / canvas.height - .5; + + // imgdata.data[4*i] = u * 255; + // imgdata.data[4*i+1] = v * 255; + // imgdata.data[4*i+2] = 0 + // imgdata.data[4*i+3] = 255; + + let color = lensflare([u, v], [0.3, 0.3]); + imgdata.data[4 * i] = color[0] * 255; + imgdata.data[4 * i + 1] = color[1] * 255; + imgdata.data[4 * i + 2] = color[2] * 255; + imgdata.data[4 * i + 3] = 255; + } + ctx.putImageData(imgdata, 0, 0); + } |