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gainmap-viewer.html
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<html>
<head>
<script>
var canvas;
var gl;
var program;
var base_texture = null;
var altr_texture = null;
var gain_texture = null;
var adapted_texture = null;
var base_size = [0,0];
var alternate_size = [0,0];
var gain_map_size = [0,0];
var display_hdr_headroom;
var hdr_headroom = 0;
var viewport_w;
var viewport_h;
var save_requested = false;
// Supported CICP values.
const kPrimariesSRGB = 1;
const kPrimariesP3 = 12;
const kPrimariesRec2020 = 9;
const kTransferSRGB = 13;
const kTransferGamma22 = 4;
const kTransferPQ = 16;
const kTransferHLG = 18;
const kModeAdaptive = 0;
const kModeBase = 1;
const kModeAlternate = 2;
const kModeGainmap = 3;
const kModeComputeAlternate = 4;
const kModeComputeGainmap = 5;
var gainmaps = [
"gainmap-data/iceberg-sdr-base.json",
"gainmap-data/iceberg-hdr-base.json",
"gainmap-data/bosco-pixel.json",
"gainmap-data/bosco2-pixel.json",
"gainmap-data/centrale-pixel.json",
"gainmap-data/galleria-pixel.json",
"gainmap-data/rochetta-pixel.json",
"gainmap-data/sforzesco-pixel.json",
"gainmap-data/duomo0-pixel.json",
"gainmap-data/gioia-pixel.json",
"gainmap-data/cadorna-pixel.json",
];
let get_channel_param = function(name) {
let e0 = document.getElementById('GainMapMetadata_Channel0_' + name);
let e1 = document.getElementById('GainMapMetadata_Channel1_' + name);
let e2 = document.getElementById('GainMapMetadata_Channel2_' + name);
if (GainMapMetadata_MultiChannel.checked) {
if (e0 != null && e1 != null && e2 != null) {
return [Number(e0.value), Number(e1.value), Number(e2.value)];
}
} else {
if (e0 != null) {
return [Number(e0.value), Number(e0.value), Number(e0.value)];
}
}
console.log(name);
throw new Error('Channels must have length 1 or 3');
}
let pow2 = function(x) {
return Math.pow(x, 2);
}
let log2 = function(x) {
return Math.log(x) / Math.log(2);
}
let clamp = function(x, a, b) {
return Math.min(Math.max(x, a), b);
}
let sign = function(x, a, b) {
return Math.sign(x);
}
let linearToSrgb = function (x) {
let a = 1.1371188301409823;
let c = 12.919999999992248;
let d = 0.003130800090713953;
let e = -0.05499994754780801;
let g = 0.4166666666666667;
if (x < d)
return c*x;
return Math.pow(a*x, g) + e;
}
const vs = `uniform int flip_y;
attribute vec2 position;
varying vec2 texcoord;
void main() {
if (flip_y == 1) {
texcoord = vec2(0.5+0.5*position.x, 0.5-0.5*position.y);
} else {
texcoord = vec2(0.5+0.5*position.x, 0.5+0.5*position.y);
}
gl_Position = vec4(position, 0.0, 1.0);
}`;
const fs = `
precision mediump float;
uniform sampler2D base_texture;
uniform sampler2D altr_texture;
uniform sampler2D gain_texture;
uniform vec3 gain_map_min;
uniform vec3 gain_map_max;
uniform vec3 gamma;
uniform vec3 base_offset;
uniform vec3 alternate_offset;
uniform float base_hdr_headroom;
uniform int base_primaries;
uniform int base_transfer;
uniform float alternate_hdr_headroom;
uniform int alternate_primaries;
uniform int alternate_transfer;
uniform int working_primaries;
uniform int drawingbuffer_primaries;
uniform int drawingbuffer_transfer;
uniform float weight;
uniform float background_gain;
uniform int mode;
varying vec2 texcoord;
int kPrimariesSRGB = 1;
int kPrimariesP3 = 12;
int kPrimariesRec2020 = 9;
int kTransferSRGB = 13;
int kTransferGamma22 = 4;
int kTransferPQ = 16;
int kTransferHLG = 18;
int kModeAdaptive = 0;
int kModeBase = 1;
int kModeAlternate = 2;
int kModeGainmap = 3;
int kModeComputeAlternate = 4;
int kModeComputeGainmap = 5;
float srgbToLinear(float x) {
if (x < 0.0)
return 0.0;
if (x < 0.04045)
return x / 12.92;
return pow((x + 0.055)/1.044, 2.4);
}
float linearToSrgb(float x) {
if (x < 0.003130800090713953)
return 12.919999999992248*x;
return pow(1.1371188301409823*x, 0.4166666666666667) - 0.05499994754780801;
}
vec3 srgbToLinear(vec3 c) {
return vec3(srgbToLinear(c.r), srgbToLinear(c.g), srgbToLinear(c.b));
}
vec3 linearToSrgb(vec3 c) {
return vec3(linearToSrgb(c.r), linearToSrgb(c.g), linearToSrgb(c.b));
}
float pqSignalToNits(float v) {
float c1 = 107.0 / 128.0;
float c2 = 2413.0 / 128.0;
float c3 = 2392.0 / 128.0;
float m1 = 1305.0 / 8192.0;
float m2 = 2523.0 / 32.0;
float p = pow(clamp(v, 0.0, 1.0), 1.0 / m2);
return 10000.0 * pow(max(p - c1, 0.0) / (c2 - c3 * p), 1.0 / m1);
}
float pqNitsToSignal(float L) {
float c1 = 107.0 / 128.0;
float c2 = 2413.0 / 128.0;
float c3 = 2392.0 / 128.0;
float m1 = 1305.0 / 8192.0;
float m2 = 2523.0 / 32.0;
float v = pow(clamp(L / 10000.0, 0.0, 1.0), m1);
return pow((c1 + c2 * v) / (1.0 + c3 * v), m2);
}
float hlgOetfInv(float x) {
const float a = 0.17883277;
const float b = 1.0 - 4.0*a;
const float c = 0.5 - a * log(4.0 * a);
if (x <= 0.5) {
return pow(x, 2.0) / 3.0;
} else {
return (exp((x - c) / a) + b) / 12.0;
}
}
float hlgOetf(float x) {
const float a = 0.17883277;
const float b = 1.0 - 4.0*a;
const float c = 0.5 - a * log(4.0 * a);
float E = 12.0 * x;
if (E < 1.0) {
return 0.5 * sqrt(E);
}
return a * log(E - b) + c;
}
vec3 hlgSignalToNits(vec3 c) {
c = clamp(c, 0.0, 1.0);
c = vec3(hlgOetfInv(c.r), hlgOetfInv(c.g), hlgOetfInv(c.b));
vec3 L = vec3(0.262700, 0.678000, 0.059300);
float Y = dot(L, c);
c *= pow(Y, 0.2);
c *= 1000.0;
return c;
}
vec3 hlgNitsToSignal(vec3 c) {
c /= 1000.0;
if (c.r > 1.0 || c.g > 1.0 || c.b > 1.0) {
return vec3(1.0);
}
c = clamp(c, 0.0, 1.0);
vec3 L = vec3(0.262700, 0.678000, 0.059300);
float Y = dot(L, c);
c *= pow(Y, -0.2 / 1.2);
c = vec3(hlgOetf(c.r), hlgOetf(c.g), hlgOetf(c.b));
return c;
}
vec3 toLinear(vec3 c, int transfer) {
if (transfer == kTransferSRGB) {
return srgbToLinear(c);
}
if (transfer == kTransferGamma22) {
return pow(c, vec3(2.2));
}
if (transfer == kTransferPQ) {
c = vec3(pqSignalToNits(c.r), pqSignalToNits(c.g), pqSignalToNits(c.b));
c /= 203.0;
return c;
}
if (transfer == kTransferHLG) {
c = hlgSignalToNits(c) / 203.0;
return c;
}
return vec3(0.0, 0.0, 0.0);
}
vec3 fromLinear(vec3 c, int transfer) {
if (transfer == kTransferSRGB) {
return linearToSrgb(c);
}
if (transfer == kTransferGamma22) {
return pow(c, vec3(1.0/2.2));
}
if (transfer == kTransferPQ) {
c *= 203.0;
c = vec3(pqNitsToSignal(c.r), pqNitsToSignal(c.g), pqNitsToSignal(c.b));
return c;
}
if (transfer == kTransferHLG) {
c = hlgNitsToSignal(c * 203.0);
return c;
}
return vec3(0.0, 0.0, 0.0);
}
vec3 convertPrimaries(vec3 c, int from, int to) {
if (from == to) {
return c;
}
if (from == kPrimariesSRGB) {
mat3 srgb_to_xyzd50 = mat3( 0.43606567, 0.2224884, 0.01391602,
0.38514709, 0.71687317, 0.09707642,
0.14306641, 0.06060791, 0.71409607);
c = srgb_to_xyzd50 * c;
} else if (from == kPrimariesP3) {
mat3 p3_to_xyzd50 = mat3( 0.515102, 0.241182, -0.00104941,
0.291965, 0.692236, 0.0418818,
0.157153, 0.0665819, 0.784378);
c = p3_to_xyzd50 * c;
} else if (from == kPrimariesRec2020) {
mat3 rec2020_to_xyzd50 = mat3( 0.673459, 0.279033, -0.00193139,
0.165661, 0.675338, 0.0299794,
0.1251, 0.0456288, 0.797162);
c = rec2020_to_xyzd50 * c;
} else {
return vec3(0.0, 0.0, 0.0);
}
if (to == kPrimariesSRGB) {
mat3 xyzd50_to_srgb = mat3( 3.13411215, -0.97878729, 0.07198304,
-1.61739246, 1.91627959, -0.22898585,
-0.4906334, 0.03345471, 1.40538513);
c = xyzd50_to_srgb * c;
} else if (to == kPrimariesP3) {
mat3 xyzd50_to_p3 = mat3( 2.40404516, -0.84222838, 0.04818706,
-0.98989869, 1.79885051, -0.09737385,
-0.39763172, 0.01604817, 1.27350664);
c = xyzd50_to_p3 * c;
} else if (to == kPrimariesRec2020) {
mat3 xyzd50_to_rec2020 = mat3( 1.6472752, -0.68261762, 0.02966273,
-0.39360248, 1.64761778, -0.06291669,
-0.23598029, 0.01281627, 1.25339643);
c = xyzd50_to_rec2020 * c;
} else {
return vec3(0.0, 0.0, 0.0);
}
return c;
}
float pqNormalizedSignal(float L, float Lw, float Lb) {
return (pqNitsToSignal(L) - pqNitsToSignal(Lb)) /
(pqNitsToSignal(Lw) - pqNitsToSignal(Lb));
}
// Return the gainmap in the working linear space.
vec3 applyGainmap(float w) {
vec3 base = texture2D(base_texture, texcoord).rgb;
base = toLinear(base, base_transfer);
base = convertPrimaries(base, base_primaries, working_primaries);
vec3 g = texture2D(gain_texture, texcoord).rgb;
g = pow(g, vec3(1.0)/gamma);
g = gain_map_min + (gain_map_max - gain_map_min) * g;
return (base + base_offset) * exp2(w * g) - alternate_offset;
}
vec3 computeGainmap() {
vec3 base = texture2D(base_texture, texcoord).rgb;
base = toLinear(base, base_transfer);
base = convertPrimaries(base, base_primaries, working_primaries);
vec3 alternate = texture2D(altr_texture, texcoord).rgb;
alternate = toLinear(alternate, alternate_transfer);
alternate = convertPrimaries(alternate, alternate_primaries, working_primaries);
vec3 g;
if (alternate_hdr_headroom < base_hdr_headroom) {
g = (base + base_offset) / (alternate + alternate_offset);
} else {
g = (alternate + alternate_offset) / (base + base_offset);
}
g = max(g, 0.0);
g = log2(g);
g = (g - gain_map_min) / (gain_map_max - gain_map_min);
g = clamp(g, 0.0, 1.0);
g = pow(g, gamma);
return g;
}
void main() {
gl_FragColor.a = 1.0;
vec3 c;
if (mode == kModeBase) {
c = texture2D(base_texture, texcoord).rgb;
c = toLinear(c, base_transfer);
c = convertPrimaries(c, base_primaries, drawingbuffer_primaries);
} else if (mode == kModeAdaptive) {
c = applyGainmap(weight);
c = convertPrimaries(c, working_primaries, drawingbuffer_primaries);
} else if (mode == kModeAlternate) {
c = texture2D(altr_texture, texcoord).rgb;
c = toLinear(c, alternate_transfer);
c = convertPrimaries(c, alternate_primaries, drawingbuffer_primaries);
} else if (mode == kModeGainmap) {
c = texture2D(gain_texture, texcoord).rgb;
} else if (mode == kModeComputeAlternate) {
c = applyGainmap(sign(alternate_hdr_headroom - base_hdr_headroom));
c = convertPrimaries(c, working_primaries, alternate_primaries);
c = fromLinear(c, alternate_transfer);
gl_FragColor.rgb = c;
return;
} else if (mode == kModeComputeGainmap) {
c = computeGainmap();
gl_FragColor.rgb = c;
return;
}
gl_FragColor.rgb = fromLinear(background_gain * c, drawingbuffer_transfer);
}`;
let compileShader = function(gl, vertex_source, fragment_source) {
let vertex_shader = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(vertex_shader, vertex_source);
gl.compileShader(vertex_shader);
if (!gl.getShaderParameter(vertex_shader, gl.COMPILE_STATUS))
throw new Error(gl.getShaderInfoLog(vertex_shader));
let fragment_shader = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(fragment_shader, fragment_source);
gl.compileShader(fragment_shader);
if (!gl.getShaderParameter(fragment_shader, gl.COMPILE_STATUS))
throw new Error(gl.getShaderInfoLog(fragment_shader));
let program = gl.createProgram();
gl.attachShader(program, vertex_shader);
gl.attachShader(program, fragment_shader);
gl.linkProgram(program);
if (!gl.getProgramParameter(program, gl.LINK_STATUS))
throw new Error(gl.getProgramInfoLog(program));
return program;
}
let createTexture = function(size, data) {
let texture = gl.createTexture();
gl.pixelStorei(gl.UNPACK_COLORSPACE_CONVERSION_WEBGL, gl.FALSE);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA16F, size[0], size[1], 0, gl.RGBA, gl.FLOAT, data);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.generateMipmap(gl.TEXTURE_2D);
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.bindTexture(gl.TEXTURE_2D, null);
return texture;
}
let setUniforms = function() {
gl.useProgram(program);
{
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, base_texture);
gl.uniform1i(gl.getUniformLocation(program, 'base_texture'), 0);
}
{
gl.activeTexture(gl.TEXTURE1);
gl.bindTexture(gl.TEXTURE_2D, gain_texture);
gl.uniform1i(gl.getUniformLocation(program, 'gain_texture'), 1);
}
{
gl.activeTexture(gl.TEXTURE2);
gl.bindTexture(gl.TEXTURE_2D, altr_texture);
gl.uniform1i(gl.getUniformLocation(program, 'altr_texture'), 2);
}
gl.uniform3fv(gl.getUniformLocation(program, 'gain_map_min'), get_channel_param('GainMapMin'));
gl.uniform3fv(gl.getUniformLocation(program, 'gain_map_max'), get_channel_param('GainMapMax'));
gl.uniform3fv(gl.getUniformLocation(program, 'gamma'), get_channel_param('Gamma'));
gl.uniform3fv(gl.getUniformLocation(program, 'base_offset'), get_channel_param('BaseOffset'));
gl.uniform3fv(gl.getUniformLocation(program, 'alternate_offset'), get_channel_param('AlternateOffset'));
gl.uniform1f(gl.getUniformLocation(program, 'base_hdr_headroom'),
Number(GainMapMetadata_BaseHdrHeadroom.value));
gl.uniform1i(gl.getUniformLocation(program, 'base_primaries'),
Number(GainMapMetadata_BasePrimaries.value));
gl.uniform1i(gl.getUniformLocation(program, 'base_transfer'),
Number(GainMapMetadata_BaseTransfer.value));
gl.uniform1f(gl.getUniformLocation(program, 'alternate_hdr_headroom'),
Number(GainMapMetadata_AlternateHdrHeadroom.value));
gl.uniform1i(gl.getUniformLocation(program, 'alternate_primaries'),
Number(GainMapMetadata_AlternatePrimaries.value));
gl.uniform1i(gl.getUniformLocation(program, 'alternate_transfer'),
Number(GainMapMetadata_AlternateTransfer.value));
if (GainMapMetadata_UseBaseImageColorSpace.checked) {
gl.uniform1i(gl.getUniformLocation(program, 'working_primaries'),
Number(GainMapMetadata_BasePrimaries.value));
} else {
gl.uniform1i(gl.getUniformLocation(program, 'working_primaries'),
Number(GainMapMetadata_AlternatePrimaries.value));
}
if (save_requested) {
gl.drawingBufferColorSpace = 'rec2100-pq';
gl.uniform1i(gl.getUniformLocation(program, 'drawingbuffer_primaries'), kPrimariesRec2020);
gl.uniform1i(gl.getUniformLocation(program, 'drawingbuffer_transfer'), kTransferPQ);
} else {
if (gl.drawingBufferColorSpace != 'srgb') {
gl.drawingBufferColorSpace = 'srgb';
}
gl.uniform1i(gl.getUniformLocation(program, 'drawingbuffer_primaries'), kPrimariesSRGB);
gl.uniform1i(gl.getUniformLocation(program, 'drawingbuffer_transfer'), kTransferSRGB);
}
{
let alternate_hdr_headroom = Number(GainMapMetadata_AlternateHdrHeadroom.value);
let base_hdr_headroom = Number(GainMapMetadata_BaseHdrHeadroom.value);
const weight =
sign(alternate_hdr_headroom - base_hdr_headroom) *
clamp((hdr_headroom - base_hdr_headroom)/
(alternate_hdr_headroom - base_hdr_headroom), 0, 1);
gl.uniform1f(gl.getUniformLocation(program, 'weight'), weight);
}
gl.uniform1f(gl.getUniformLocation(program, 'background_gain'), BackgroundGainSlider.value);
}
function drawQuad(flipY = false) {
let vertices = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertices);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([-1,-1, 1,-1, 1,1, -1,1]), gl.STATIC_DRAW);
let indices = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indices);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array([0,1,2, 0,2,3]), gl.STATIC_DRAW);
let positionLocation = gl.getAttribLocation(program, 'position');
gl.vertexAttribPointer(positionLocation, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(positionLocation);
gl.uniform1i(gl.getUniformLocation(program, 'flip_y'), flipY ? 1 : 0);
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
}
function computeGainmap() {
if (!base_texture || !altr_texture) {
throw('Need both base and alternate to compute gainmap!');
}
setUniforms();
gain_map_size[0] = Math.min(base_size[0], alternate_size[0]);
gain_map_size[1] = Math.min(base_size[1], alternate_size[1]);
gl.activeTexture(gl.TEXTURE1);
gl.bindTexture(gl.TEXTURE_2D, null);
if (gain_texture) {
gl.deleteTexture(gain_texture);
}
gain_texture = createTexture(gain_map_size, null);
gl.uniform1i(gl.getUniformLocation(program, 'mode'), kModeComputeGainmap);
let fbo = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, gain_texture, 0);
if (gl.FRAMEBUFFER_COMPLETE != gl.checkFramebufferStatus(gl.FRAMEBUFFER)) {
throw('Incomplete framebuffer');
}
drawQuad();
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.deleteFramebuffer(fbo);
draw();
}
function computeAlternate() {
setUniforms();
alternate_size[0] = base_size[0];
alternate_size[1] = base_size[1];
gl.activeTexture(gl.TEXTURE2);
gl.bindTexture(gl.TEXTURE_2D, null);
if (altr_texture) {
gl.deleteTexture(altr_texture);
}
altr_texture = createTexture(alternate_size, null);
gl.uniform1i(gl.getUniformLocation(program, 'mode'), kModeComputeAlternate);
let fbo = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, altr_texture, 0);
if (gl.FRAMEBUFFER_COMPLETE != gl.checkFramebufferStatus(gl.FRAMEBUFFER)) {
throw('Incomplete framebuffer');
}
drawQuad();
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.deleteFramebuffer(fbo);
draw();
}
function swapBaseAndAlternate() {
computeAlternate();
var temp;
temp = base_size; base_size = alternate_size; alternate_size = temp;
temp = base_texture; base_texture = altr_texture; altr_texture = temp;
temp = GainMapMetadata_BaseHdrHeadroom.value; GainMapMetadata_BaseHdrHeadroom.value = GainMapMetadata_AlternateHdrHeadroom.value; GainMapMetadata_AlternateHdrHeadroom.value = temp;
temp = GainMapMetadata_Channel0_BaseOffset.value; GainMapMetadata_Channel0_BaseOffset.value = GainMapMetadata_Channel0_AlternateOffset.value; GainMapMetadata_Channel0_AlternateOffset.value = temp;
temp = GainMapMetadata_Channel1_BaseOffset.value; GainMapMetadata_Channel1_BaseOffset.value = GainMapMetadata_Channel1_AlternateOffset.value; GainMapMetadata_Channel1_AlternateOffset.value = temp;
temp = GainMapMetadata_Channel2_BaseOffset.value; GainMapMetadata_Channel2_BaseOffset.value = GainMapMetadata_Channel2_AlternateOffset.value; GainMapMetadata_Channel2_AlternateOffset.value = temp;
temp = GainMapMetadata_BasePrimaries.value; GainMapMetadata_BasePrimaries.value = GainMapMetadata_AlternatePrimaries.value; GainMapMetadata_AlternatePrimaries.value = temp;
temp = GainMapMetadata_BaseTransfer.value; GainMapMetadata_BaseTransfer.value = GainMapMetadata_AlternateTransfer.value; GainMapMetadata_AlternateTransfer.value = temp;
GainMapMetadata_UseBaseImageColorSpace.checked = !GainMapMetadata_UseBaseImageColorSpace.checked;
draw();
}
let draw = function() {
setUniforms();
if (RadioAdaptive.checked && base_texture && gain_texture) {
gl.uniform1i(gl.getUniformLocation(program, 'mode'), kModeAdaptive);
} else if (RadioBase.checked && base_texture) {
gl.uniform1i(gl.getUniformLocation(program, 'mode'), kModeBase);
} else if (RadioGain.checked && gain_texture) {
gl.uniform1i(gl.getUniformLocation(program, 'mode'), kModeGainmap);
} else if (RadioAlternate.checked && altr_texture) {
gl.uniform1i(gl.getUniformLocation(program, 'mode'), kModeAlternate);
} else if (base_texture) {
gl.uniform1i(gl.getUniformLocation(program, 'mode'), kModeBase);
} else if (altr_texture) {
gl.uniform1i(gl.getUniformLocation(program, 'mode'), kModeAlternate);
} else if (gain_texture) {
gl.uniform1i(gl.getUniformLocation(program, 'mode'), kModeGainmap);
}
drawQuad(flipY = true);
if (save_requested) {
save_requested = false;
var mime_type = "image/png";
var download_link = document.createElement('a');
download_link.download = 'canvas.png';
download_link.href = canvas.toDataURL(mime_type);
download_link.dataset.downloadurl = [mime_type, download_link.download, download_link.href].join(':');
document.body.appendChild(download_link);
download_link.click();
document.body.removeChild(download_link);
}
}
let initializeGL = function() {
warningsText = '';
canvas = document.getElementById('Canvas');
gl = canvas.getContext('webgl2');
if (`configureHighDynamicRange` in canvas) {
canvas.configureHighDynamicRange({ mode:'extended' });
} else {
warningsText += 'Experimental HDR Canvas API not found (configureHighDyanmicRange)!<br>'
}
gl.getExtension('EXT_color_buffer_half_float');
if (`drawingBufferStorage` in gl) {
gl.drawingBufferStorage(gl.RGBA16F, gl.drawingBufferWidth, gl.drawingBufferHeight);
} else {
warningsText += 'Experimental WebGL API not found (drawingBufferStorage)!<br>'
}
gl.drawingBufferColorSpace = 'srgb';
if (warningsText == '') {
} else {
warningsText += 'Use Chrome Canary and Enable "Experimental Web Platform Features" in chrome://flags';
warnings = document.getElementById('Warnings');
warnings.hidden = false;
warnings.style = 'color:red;';
warnings.innerHTML = '<strong>' + warningsText + '</strong>';
}
program = compileShader(gl, vs, fs);
// Start black.
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
}
let loadBaseImage = function(src) {
let image_base = new Image();
image_base.onload = function() {
base_size[0] = image_base.width;
base_size[1] = image_base.height;
base_texture = createTexture(base_size, image_base);
viewport_w = image_base.width;
viewport_h = image_base.height;
canvas.width = viewport_w;
canvas.height = viewport_h;
canvas.style = 'max-width:100%; max-height:75vh;';
gl.viewport(0, 0, viewport_w, viewport_h);
draw();
}
image_base.src = src;
}
let loadGainImage = function(src) {
image_gainmap = new Image();
image_gainmap.onload = function() {
gain_map_size[0] = image_gainmap.width;
gain_map_size[1] = image_gainmap.height;
gain_texture = createTexture(gain_map_size, image_gainmap);
draw();
}
image_gainmap.src = src;
}
let loadAltrImage = function(src) {
image_altr = new Image();
image_altr.onload = function() {
alternate_size[0] = image_altr.width;
alternate_size[1] = image_altr.height;
altr_texture = createTexture(alternate_size, image_altr);
draw();
}
image_altr.src = src;
}
let onGainmapJsonLoaded = function(gainmap_json) {
loadBaseImage(gainmap_json.base_url);
if (`gainmap_url` in gainmap_json) {
loadGainImage(gainmap_json.gainmap_url);
}
if (`alternate_url` in gainmap_json) {
loadAltrImage(gainmap_json.alternate_url);
}
GainMapMetadata_UseBaseImageColorSpace.checked = gainmap_json.use_base_colour_space;
GainMapMetadata_BaseHdrHeadroom.value = gainmap_json.base_hdr_headroom;
GainMapMetadata_AlternateHdrHeadroom.value = gainmap_json.alternate_hdr_headroom;
GainMapMetadata_MultiChannel.checked = gainmap_json.channels.length == 3;
GainMapMetadata_Channel0_GainMapMin.value = gainmap_json.channels[0].gain_map_min;
GainMapMetadata_Channel0_GainMapMax.value = gainmap_json.channels[0].gain_map_max;
GainMapMetadata_Channel0_Gamma.value = gainmap_json.channels[0].gamma;
GainMapMetadata_Channel0_BaseOffset.value = gainmap_json.channels[0].base_offset;
GainMapMetadata_Channel0_AlternateOffset.value = gainmap_json.channels[0].alternate_offset;
if (gainmap_json.channels.length == 3) {
GainMapMetadata_MultiChannel.checked = true;
GainMapMetadata_Channel1_GainMapMin.value = gainmap_json.channels[1].gain_map_min;
GainMapMetadata_Channel1_GainMapMax.value = gainmap_json.channels[1].gain_map_max;
GainMapMetadata_Channel1_Gamma.value = gainmap_json.channels[1].gamma;
GainMapMetadata_Channel1_BaseOffset.value = gainmap_json.channels[1].base_offset;
GainMapMetadata_Channel1_AlternateOffset.value = gainmap_json.channels[1].alternate_offset;
GainMapMetadata_Channel2_GainMapMin.value = gainmap_json.channels[2].gain_map_min;
GainMapMetadata_Channel2_GainMapMax.value = gainmap_json.channels[2].gain_map_max;
GainMapMetadata_Channel2_Gamma.value = gainmap_json.channels[2].gamma;
GainMapMetadata_Channel2_BaseOffset.value = gainmap_json.channels[2].base_offset;
GainMapMetadata_Channel2_AlternateOffset.value = gainmap_json.channels[2].alternate_offset;
} else {
GainMapMetadata_MultiChannel.checked = false;
}
GainMapMetadata_Channel1.hidden = !GainMapMetadata_MultiChannel.checked;
GainMapMetadata_Channel2.hidden = !GainMapMetadata_MultiChannel.checked;
GainMapMetadata_BasePrimaries.value = gainmap_json.base_primaries;
GainMapMetadata_BaseTransfer.value = gainmap_json.base_transfer;
GainMapMetadata_AlternatePrimaries.value = gainmap_json.alternate_primaries;
GainMapMetadata_AlternateTransfer.value = gainmap_json.alternate_transfer;
}
let loadGainmap = function(gainmap_json_url) {
base_texture = null;
gain_texture = null;
altr_texture = null;
fetch(gainmap_json_url)
.then(res => res.json())
.then(out => onGainmapJsonLoaded(out))
.catch();
}
function onHdrToSdrSliderChanged() {
hdr_headroom = Number(HdrToSdrSlider.value);
HdrToSdrSliderLabel.innerText = 'Rendering HDR to SDR ratio: ' + hdr_headroom.toFixed(2);
draw();
}
function onBackgroundGainSliderChanged() {
let background_gain = BackgroundGainSlider.value;
let val = (255*linearToSrgb(background_gain)).toFixed();
BackgroundGainSliderLabel.innerHTML =
'Background: rgb(' + val + ')<br>' +
'Gain: 1/' + (1/background_gain).toFixed(2);
document.body.style.backgroundColor = 'rgb(' + val + ',' + val + ',' + val + ')';
draw();
}
let onChange = function() {
GainMapMetadata_Channel1.hidden = !GainMapMetadata_MultiChannel.checked;
GainMapMetadata_Channel2.hidden = !GainMapMetadata_MultiChannel.checked;
draw();
}
function onHdrToSdrFromScreenChanged() {
if (UpdateHdrToSdrFromScreen.checked && display_hdr_headroom) {
HdrToSdrSlider.value = display_hdr_headroom;
onHdrToSdrSliderChanged();
}
}
function main() {
initializeGL();
// Build the gallery.
for (i in gainmaps) {
let gainmap_json_url = gainmaps[i];
let element = new Image();
element.style = 'max-width:150px; max-height:150px; padding:10px;';
let fn = function() { loadGainmap(gainmap_json_url); };
element.onclick = fn;
Gallery.appendChild(element);
let setThumbnail = function(gainmap_json) {
if (`thumbnail_url` in gainmap_json) {
element.src = gainmap_json.thumbnail_url;
}
element.src = gainmap_json.base_url;
}
// Fetch the JSON
fetch(gainmap_json_url)
.then(res => res.json())
.then(out => setThumbnail(out))
.catch();
}
HdrToSdrSlider.addEventListener('input', onHdrToSdrSliderChanged, false);
BackgroundGainSlider.addEventListener('input', onBackgroundGainSliderChanged, false);
// Configure the HDR screen info.
{
async function screenDetails() {
const screens = await window.getScreenDetails();
const s = screens.currentScreen;
function updateCurrentScreenInfo(s) {
display_hdr_headroom = log2(s.highDynamicRangeHeadroom).toFixed(2);
if (UpdateHdrToSdrFromScreen.checked) {
onHdrToSdrFromScreenChanged();
}
document.getElementById('DisplayValue').innerText =
'Screen HDR headroom: ' + display_hdr_headroom + '.';
}
updateCurrentScreenInfo(s);
screens.addEventListener('currentscreenchange', (event) => {
updateCurrentScreenInfo(s);
});
}
ButtonDetails.addEventListener('click', screenDetails);
}
let saveCanvas = function() {
save_requested = true;
draw();
}
ButtonSave.addEventListener('click', saveCanvas);
ButtonComputeGainmap.addEventListener('click', computeGainmap);
ButtonComputeAltr.addEventListener('click', computeAlternate);
ButtonSwapBaseAndAltr.addEventListener('click', swapBaseAndAlternate);
let loadImage = function(fileList, fn) {
let reader = new FileReader();
reader.onloadend = function() {
let url = reader.result;
fn(url);
}
reader.readAsDataURL(fileList[0]);
}
ButtonUploadBaseFake.addEventListener('click', function() { ButtonUploadBase.click(); });
ButtonUploadBaseFake.addEventListener('dragover', function (e) { e.preventDefault(); });
ButtonUploadAltrFake.addEventListener('click', function() { ButtonUploadAltr.click(); });
ButtonUploadAltrFake.addEventListener('dragover', function (e) { e.preventDefault(); });
ButtonUploadGainFake.addEventListener('click', function() { ButtonUploadGain.click(); });
ButtonUploadGainFake.addEventListener('dragover', function (e) { e.preventDefault(); });
ButtonUploadBaseFake.addEventListener('drop', function (e) {
e.preventDefault();
loadImage(e.dataTransfer.files, loadBaseImage);
});
ButtonUploadBase.addEventListener('change', function(e) {
loadImage(ButtonUploadBase.files, loadBaseImage);
});
ButtonUploadAltrFake.addEventListener('drop', function (e) {
e.preventDefault();
loadImage(e.dataTransfer.files, loadAltrImage);
});
ButtonUploadAltr.addEventListener('change', function(e) {
loadImage(ButtonUploadAltr.files, loadAltrImage);
});
ButtonUploadGainFake.addEventListener('drop', function (e) {
e.preventDefault();
loadImage(e.dataTransfer.files, loadGainImage);
});
ButtonUploadGain.addEventListener('change', function(e) {
loadImage(ButtonUploadGain.files, loadGainImage);
});
}
</script>
</head>
<body onload='main()'>
<h3>Rendering Parameters</h3>
<div style="text-align:center;">
<p>
Rendering mode:
<input type="radio" id="RadioAdaptive" name="render_mode" onchange='draw();' value="adaptive" checked="true">
<label for="RadioAdaptive">Adaptive</label>
<input type="radio" id="RadioBase" name="render_mode" onchange='draw();' value="base">
<label for="RadioBase">Base</label>
<input type="radio" id="RadioGain" name="render_mode" onchange='draw();' value="gainmap">
<label for="RadioGain">Gainmap</label>
<input type="radio" id="RadioAlternate" name="render_mode" onchange='draw();' value="alternate">
<label for="RadioAlternate">Alternate</label>
</p>
<p style="text-align:center">
<table style="margin-left: auto; margin-right: auto;">
<tr>
<td style="text-align:center; width:300px;">
<p><label id="HdrToSdrSliderLabel" for="HdrToSdrSlider">Rendering HDR to SDR ratio: 1.00</label></p>
<p><input id="HdrToSdrSlider" type="range" min="0" max="5" step="0.1" value="0" list="tickmarks""/></p>
<datalist id="tickmarks">
<option value="0" label="0"></option>
<option value="1" label="1"></option>
<option value="2" label="2"></option>
<option value="3" label="3"></option>
<option value="4" label="4"></option>
</datalist>
</td>
<td style="width:15px;"></td><td style="width:15px; border-left:1px solid black;"></td>
<td style="text-align:center; width:300px;">
<p id="DisplayValue">Screen HDR to SDR ratio: (unknown)</p>
<p><button type="button" id="ButtonDetails">Query display HDR to SDR ratio</button></p>
</td>
<td style="width:15px;"></td><td style="width:15px; border-left:1px solid black;"></td>
<td style="text-align:center; width:300px;">
<p><label id="UpdateHdrToSdrFromScreenLabel" for="UpdateHdrToSdrFromScreen">Set rendering HDR to SDR ratio from screen:</label></p>
<p><input type="checkbox" id="UpdateHdrToSdrFromScreen" name="UpdateHdrToSdrFromScreen" value="true" onclick="onHdrToSdrFromScreenChanged();"></p>
</td>
<td style="width:15px;"></td><td style="width:15px; border-left:1px solid black;"></td>
<td style="text-align:center; width:150px;">
<p><label id="BackgroundGainSliderLabel" for="BackgroundGainSlider">Background gain: 1.00</label></p>
<p><input id="BackgroundGainSlider" type="range" min="0" max="1" step="0.005" value="1"/></p>
<p><button type="button" id="ButtonSave">Save Canvas</button></p>
</td>
</tr>
</table>
</p>
</div>
<h3>Rendering Canvas</h3>
<div id='Viewer' style='text-align:center;'>
<p id='Warnings' hidden=true>Click an image from the gallery to view it</p>
<p><canvas id='Canvas' width='32' height='32'></canvas></p>
</div>
<h3>Gallery</h3>
<p>
Images are from Eric Chan's HDR <a href="https://people.csail.mit.edu/ericchan/hdr/hdr.php">AVIF gallery</a> and <a href="https://people.csail.mit.edu/ericchan/hdr/jpeg-gain-map.php">JPEG gallery</a>, used with permission.
</p>
<div id='GalleryContainer'>
<div id='Gallery' style="dynamic-range-limit:standard;">
</div>
</div>
<h3>Gainmap image properties</h3>
<p>
<input type="file" id="ButtonUploadBase" style="display:none">
<button type="button" id="ButtonUploadBaseFake">Upload base</button>
<input type="file" id="ButtonUploadAltr" style="display:none">
<button type="button" id="ButtonUploadAltrFake">Upload alternate</button>
<input type="file" id="ButtonUploadGain" style="display:none">
<button type="button" id="ButtonUploadGainFake">Upload gainmap</button>
</p>
<p>
<button type="button" id="ButtonSwapBaseAndAltr">Swap base and alternate</button>
<button type="button" id="ButtonComputeAltr">Compute alternate</button>
<button type="button" id="ButtonComputeGainmap">Compute gainmap</button>
</p>
<p>
<label for="GainMapMetadata_UseBaseImageColorSpace">Use base image color space</label>
<input id="GainMapMetadata_UseBaseImageColorSpace" type="checkbox" onchange='onChange();' checked/>
<br>
<!-- Base image parameters -->
<span style="width:80px;display:inline-block;">Base:</span>