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04c-filter.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>WebGL</title>
</head>
<body>
<div>
<input type="range" id="brightness" min="-1" max="1" step="0.1" />Brightness<br />
<input type="range" id="contrast" min="0" max="2" step="0.1" />Contrast<br />
<input type="range" id="exposure" min="0" max="2" step="0.1" />Exposure<br />
<input type="range" id="saturation" min="0" max="2" step="0.1" />Saturation<br />
<select id="filter"></select>
<button id="save">Save</button>
</div>
<canvas id="c"></canvas>
<script type="module">
import * as mat4 from "./js/gl-matrix/mat4.js";
import * as vec4 from "./js/gl-matrix/vec4.js";
const createShader = (gl, type, source) => {
const shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
const success = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
if (success) {
return shader;
}
console.error(gl.getShaderInfoLog(shader));
gl.deleteShader(shader);
};
const createProgram = (gl, vertexShader, fragmentShader) => {
const program = gl.createProgram();
gl.attachShader(program, vertexShader);
gl.attachShader(program, fragmentShader);
gl.linkProgram(program);
const success = gl.getProgramParameter(program, gl.LINK_STATUS);
if (success) {
return program;
}
console.error(gl.getProgramInfoLog(program));
gl.deleteProgram(program);
};
const canvas = document.querySelector('#c');
const $brightness = document.getElementById('brightness');
const $contrast = document.getElementById('contrast');
const $exposure = document.getElementById('exposure');
const $saturation = document.getElementById('saturation');
const $filter = document.getElementById('filter');
const $button = document.getElementById('save');
const gl = canvas.getContext('webgl');
const vertexShader = createShader(gl, gl.VERTEX_SHADER, `
precision mediump float;
attribute vec2 a_position;
attribute vec2 a_texCoord;
varying vec2 uv;
void main() {
gl_Position = vec4(a_position, 1, 1);
uv = a_texCoord;
}
`);
const fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, `
precision mediump float;
uniform sampler2D texture;
uniform mat4 matrix;
uniform vec4 offset;
varying vec2 uv;
void main() {
vec4 sampleColor = texture2D(texture, uv);
gl_FragColor = matrix * sampleColor + offset;
}
`);
const program = createProgram(gl, vertexShader, fragmentShader);
const positionAttributeLocation = gl.getAttribLocation(program, "a_position");
const positionBuffer = gl.createBuffer();
const texCoordAttributeLocation = gl.getAttribLocation(program, "a_texCoord");
const texCoordBuffer = gl.createBuffer();
const matrixLocation = gl.getUniformLocation(program, "matrix");
const offsetLocation = gl.getUniformLocation(program, "offset");
const matrix = mat4.create();
const offset = vec4.create();
const u_brightnessMatrix = mat4.create();
const u_brightnessOffset = vec4.create();
const u_contrastMatrix = mat4.create();
const u_contrastOffset = vec4.create();
const u_exposureMatrix = mat4.create();
const u_exposureOffset = vec4.create();
const u_saturationMatrix = mat4.create();
const u_saturationOffset = vec4.create();
const filters = {
// make sure the original style is in the list
'original': {
label: 'Original',
matrix: () => [
1, 0, 0, 0, 0,
0, 1, 0, 0, 0,
0, 0, 1, 0, 0,
0, 0, 0, 1, 0,
]
},
// the default filters
'chrome': {
label: 'Bright',
matrix: () => [
1.398,-0.316, 0.065,-0.273, 0.201,
-0.051, 1.278,-0.080,-0.273, 0.201,
-0.051, 0.119, 1.151,-0.290, 0.215,
0.000, 0.000, 0.000, 1.000, 0.000
]
},
'fade': {
label: 'Dark',
matrix: () => [
1.073,-0.015, 0.092,-0.115,-0.017,
0.107, 0.859, 0.184,-0.115,-0.017,
0.015, 0.077, 1.104,-0.115,-0.017,
0.000, 0.000, 0.000, 1.000, 0.000
]
},
'mono': {
label: 'Mono',
matrix: () => [
0.212, 0.715, 0.114, 0.000, 0.000,
0.212, 0.715, 0.114, 0.000, 0.000,
0.212, 0.715, 0.114, 0.000, 0.000,
0.000, 0.000, 0.000, 1.000, 0.000
]
},
'noir': {
label: 'Noir',
matrix: () => [
0.150, 1.300,-0.250, 0.100,-0.200,
0.150, 1.300,-0.250, 0.100,-0.200,
0.150, 1.300,-0.250, 0.100,-0.200,
0.000, 0.000, 0.000, 1.000, 0.000
]
},
// add your own filters
'sepia': {
label: 'Sepia',
matrix: () => [
0.394, 0.769, 0.189, 0.000, 0.000,
0.349, 0.686, 0.168, 0.000, 0.000,
0.272, 0.534, 0.131, 0.000, 0.000,
0.000, 0.000, 0.000, 1.000, 0.000
]
}
};
let selectedFilter = filters.original;
const init = async () => {
const imgTexture = await loadImage("images/devine_selectie-087.jpg");
gl.useProgram(program);
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([
-1.0, 1.0,
1.0, 1.0,
-1.0, -1.0,
-1.0, -1.0,
1.0, 1.0,
1.0, -1.0
]),
gl.STATIC_DRAW);
gl.enableVertexAttribArray(positionAttributeLocation);
gl.vertexAttribPointer(positionAttributeLocation, 2, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, texCoordBuffer);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([
0.0, 0.0,
1.0, 0.0,
0.0, 1.0,
0.0, 1.0,
1.0, 0.0,
1.0, 1.0,
]),
gl.STATIC_DRAW);
gl.enableVertexAttribArray(texCoordAttributeLocation);
gl.vertexAttribPointer(texCoordAttributeLocation, 2, gl.FLOAT, false, 0, 0);
uploadImageToTexture(imgTexture, "texture", 0);
canvas.width = imgTexture.width;
canvas.height = imgTexture.height;
$brightness.addEventListener('input', e => {
const value = $brightness.value;
u_brightnessOffset[0] = value;
u_brightnessOffset[1] = value;
u_brightnessOffset[2] = value;
});
$contrast.addEventListener('input', e => {
const x = $contrast.value;
const y = (1 - x) / 2;
u_contrastMatrix[0] = x;
u_contrastMatrix[5] = x;
u_contrastMatrix[10] = x;
u_contrastMatrix[15] = x;
u_contrastOffset[0] = y;
u_contrastOffset[1] = y;
u_contrastOffset[2] = y;
});
$exposure.addEventListener('input', e => {
const x = $exposure.value;
u_exposureMatrix[0] = x;
u_exposureMatrix[5] = x;
u_exposureMatrix[10] = x;
u_exposureMatrix[15] = x;
});
$saturation.addEventListener('input', e => {
// https://www.w3.org/TR/WCAG20/#relativeluminancedef
const lr = 0.2126;
const lg = 0.7152;
const lb = 0.0722;
const s = parseFloat($saturation.value);
const sr = (1 - s) * lr;
const sg = (1 - s) * lg;
const sb = (1 - s) * lb;
u_saturationMatrix[0] = sr+s;
u_saturationMatrix[1] = sg;
u_saturationMatrix[2] = sb;
u_saturationMatrix[4] = sr;
u_saturationMatrix[5] = sg+s;
u_saturationMatrix[6] = sb;
u_saturationMatrix[8] = sr;
u_saturationMatrix[9] = sg;
u_saturationMatrix[10] = sb+s;
});
for (const filterName in filters) {
if (filters.hasOwnProperty(filterName)) {
const filter = filters[filterName];
const $option = document.createElement('option');
$option.value = filterName;
$option.textContent = filter.label;
$filter.appendChild($option);
}
}
$filter.addEventListener('input', (e) => {
const filterName = $filter.value;
selectedFilter = filters[filterName];
});
$button.addEventListener('click', (e) => {
mat4.identity(matrix);
mat4.multiply(matrix, matrix, u_brightnessMatrix);
mat4.multiply(matrix, matrix, u_contrastMatrix);
mat4.multiply(matrix, matrix, u_exposureMatrix);
const saturationTransposed = mat4.create();
mat4.transpose(saturationTransposed, u_saturationMatrix);
mat4.multiply(matrix, matrix, saturationTransposed);
const selectedFilterResult = selectedFilter.matrix();
const filterMatrix = mat4.fromValues(
selectedFilterResult[0], selectedFilterResult[1], selectedFilterResult[2], selectedFilterResult[3],
selectedFilterResult[5], selectedFilterResult[6], selectedFilterResult[7], selectedFilterResult[8],
selectedFilterResult[10], selectedFilterResult[11], selectedFilterResult[12], selectedFilterResult[13],
selectedFilterResult[15], selectedFilterResult[16], selectedFilterResult[17], selectedFilterResult[18],
);
mat4.transpose(filterMatrix, filterMatrix);
const filterOffset = vec4.fromValues(selectedFilterResult[4], selectedFilterResult[9], selectedFilterResult[14], selectedFilterResult[19]);
mat4.multiply(matrix, matrix, filterMatrix);
vec4.zero(offset);
vec4.add(offset, offset, u_brightnessOffset);
vec4.add(offset, offset, u_contrastOffset);
vec4.add(offset, offset, u_exposureOffset);
vec4.add(offset, offset, u_saturationOffset);
vec4.add(offset, offset, filterOffset);
console.log(matrix);
console.log(offset);
});
drawScene();
};
const drawScene = () => {
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
gl.clearColor(0, 0, 0, 0);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.useProgram(program);
mat4.identity(matrix);
mat4.multiply(matrix, matrix, u_brightnessMatrix);
mat4.multiply(matrix, matrix, u_contrastMatrix);
mat4.multiply(matrix, matrix, u_exposureMatrix);
const saturationTransposed = mat4.create();
mat4.transpose(saturationTransposed, u_saturationMatrix);
mat4.multiply(matrix, matrix, saturationTransposed);
const selectedFilterResult = selectedFilter.matrix();
const filterMatrix = mat4.fromValues(
selectedFilterResult[0], selectedFilterResult[1], selectedFilterResult[2], selectedFilterResult[3],
selectedFilterResult[5], selectedFilterResult[6], selectedFilterResult[7], selectedFilterResult[8],
selectedFilterResult[10], selectedFilterResult[11], selectedFilterResult[12], selectedFilterResult[13],
selectedFilterResult[15], selectedFilterResult[16], selectedFilterResult[17], selectedFilterResult[18],
);
mat4.transpose(filterMatrix, filterMatrix);
const filterOffset = vec4.fromValues(selectedFilterResult[4], selectedFilterResult[9], selectedFilterResult[14], selectedFilterResult[19]);
mat4.multiply(matrix, matrix, filterMatrix);
vec4.zero(offset);
vec4.add(offset, offset, u_brightnessOffset);
vec4.add(offset, offset, u_contrastOffset);
vec4.add(offset, offset, u_exposureOffset);
vec4.add(offset, offset, u_saturationOffset);
vec4.add(offset, offset, filterOffset);
gl.uniformMatrix4fv(matrixLocation, false, matrix);
gl.uniform4fv(offsetLocation, offset);
gl.drawArrays(gl.TRIANGLES, 0, 6);
requestAnimationFrame(drawScene);
};
const loadImage = (src) => {
return new Promise((resolve, reject) => {
const img = new Image();
img.addEventListener("load", () => resolve(img));
img.addEventListener("error", err => reject(err));
img.src = src;
});
};
const map = (value, x1, y1, x2, y2) => (value - x1) * (y2 - x2) / (y1 - x1) + x2;
const uploadImageToTexture = (img, uniformName, textureUnitIndex) => {
const u_imageLoc = gl.getUniformLocation(program, uniformName);
gl.uniform1i(u_imageLoc, textureUnitIndex);
const texture = gl.createTexture();
gl.activeTexture(gl.TEXTURE0 + textureUnitIndex);
gl.bindTexture(gl.TEXTURE_2D, texture);
// Set the parameters so we can render any size image.
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
// Upload the image into the texture.
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img);
};
init();
</script>
</body>
</html>