mirror of
https://github.com/nicbarker/clay.git
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500 lines
26 KiB
HTML
500 lines
26 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>Clay - UI Layout Library</title>
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<style>
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html,
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body {
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width: 100%;
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height: 100%;
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overflow: hidden;
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padding: 0;
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margin: 0;
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pointer-events: none;
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}
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@font-face {
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font-family: 'Calistoga';
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font-style: normal;
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font-weight: 400;
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src: url('/fonts/Calistoga-Regular.ttf') format('truetype');
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}
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@font-face {
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font-family: 'Quicksand';
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font-style: normal;
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font-weight: 400;
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src: url('/fonts/Quicksand-Semibold.ttf') format('truetype');
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}
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body>canvas {
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width: 100%;
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height: 100%;
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}
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</style>
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</head>
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<script type="module">
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const CLAY_RENDER_COMMAND_TYPE_NONE = 0;
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const CLAY_RENDER_COMMAND_TYPE_RECTANGLE = 1;
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const CLAY_RENDER_COMMAND_TYPE_BORDER = 2;
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const CLAY_RENDER_COMMAND_TYPE_TEXT = 3;
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const CLAY_RENDER_COMMAND_TYPE_IMAGE = 4;
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const CLAY_RENDER_COMMAND_TYPE_SCISSOR_START = 5;
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const CLAY_RENDER_COMMAND_TYPE_SCISSOR_END = 6;
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const CLAY_RENDER_COMMAND_TYPE_CUSTOM = 7;
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const GLOBAL_FONT_SCALING_FACTOR = 0.8;
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let renderCommandSize = 0;
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let scratchSpaceAddress = 0;
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let heapSpaceAddress = 0;
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let memoryDataView;
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let textDecoder = new TextDecoder("utf-8");
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let previousFrameTime;
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let fontsById = [
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// YOUR FONTS HERE
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];
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let elementCache = {};
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let imageCache = {};
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let colorDefinition = {
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type: 'struct', members: [
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{ name: 'r', type: 'float' },
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{ name: 'g', type: 'float' },
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{ name: 'b', type: 'float' },
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{ name: 'a', type: 'float' },
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]
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};
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let stringDefinition = {
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type: 'struct', members: [
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{ name: 'length', type: 'uint32_t' },
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{ name: 'chars', type: 'uint32_t' },
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]
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};
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let borderDefinition = {
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type: 'struct', members: [
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{ name: 'width', type: 'uint32_t' },
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{ name: 'color', ...colorDefinition },
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]
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};
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let cornerRadiusDefinition = {
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type: 'struct', members: [
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{ name: 'topLeft', type: 'float' },
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{ name: 'topRight', type: 'float' },
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{ name: 'bottomLeft', type: 'float' },
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{ name: 'bottomRight', type: 'float' },
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]
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};
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let rectangleConfigDefinition = {
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name: 'rectangle', type: 'struct', members: [
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{ name: 'color', ...colorDefinition },
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{ name: 'cornerRadius', ...cornerRadiusDefinition },
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{ name: 'link', ...stringDefinition },
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{ name: 'cursorPointer', type: 'uint8_t' },
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]
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};
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let borderConfigDefinition = {
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name: 'text', type: 'struct', members: [
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{ name: 'left', ...borderDefinition },
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{ name: 'right', ...borderDefinition },
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{ name: 'top', ...borderDefinition },
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{ name: 'bottom', ...borderDefinition },
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{ name: 'betweenChildren', ...borderDefinition },
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{ name: 'cornerRadius', ...cornerRadiusDefinition }
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]
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};
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let textConfigDefinition = {
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name: 'text', type: 'struct', members: [
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{ name: 'textColor', ...colorDefinition },
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{ name: 'fontId', type: 'uint16_t' },
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{ name: 'fontSize', type: 'uint16_t' },
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{ name: 'letterSpacing', type: 'uint16_t' },
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{ name: 'lineHeight', type: 'uint16_t' },
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{ name: 'wrapMode', type: 'uint32_t' },
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{ name: 'disablePointerEvents', type: 'uint8_t' }
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]
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};
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let imageConfigDefinition = {
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name: 'image', type: 'struct', members: [
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{ name: 'imageData', type: 'uint32_t' },
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{
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name: 'sourceDimensions', type: 'struct', members: [
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{ name: 'width', type: 'float' },
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{ name: 'height', type: 'float' },
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]
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},
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{ name: 'sourceURL', ...stringDefinition }
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]
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};
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let customConfigDefinition = {
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name: 'custom', type: 'struct', members: [
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{ name: 'customData', type: 'uint32_t' },
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]
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}
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let renderCommandDefinition = {
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name: 'CLay_RenderCommand',
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type: 'struct',
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members: [
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{
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name: 'boundingBox', type: 'struct', members: [
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{ name: 'x', type: 'float' },
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{ name: 'y', type: 'float' },
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{ name: 'width', type: 'float' },
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{ name: 'height', type: 'float' },
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]
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},
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{ name: 'config', type: 'uint32_t' },
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{ name: 'text', ...stringDefinition },
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{ name: 'id', type: 'uint32_t' },
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{ name: 'commandType', type: 'uint32_t', },
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]
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};
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function getStructTotalSize(definition) {
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switch (definition.type) {
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case 'union':
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case 'struct': {
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let totalSize = 0;
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for (const member of definition.members) {
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let result = getStructTotalSize(member);
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if (definition.type === 'struct') {
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totalSize += result;
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} else {
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totalSize = Math.max(totalSize, result);
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}
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}
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return totalSize;
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}
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case 'float': return 4;
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case 'uint32_t': return 4;
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case 'uint16_t': return 2;
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case 'uint8_t': return 1;
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default: {
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throw "Unimplemented C data type " + definition.type
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}
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}
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}
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function readStructAtAddress(address, definition) {
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switch (definition.type) {
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case 'union':
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case 'struct': {
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let struct = { __size: 0 };
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for (const member of definition.members) {
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let result = readStructAtAddress(address, member);
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struct[member.name] = result;
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if (definition.type === 'struct') {
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struct.__size += result.__size;
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address += result.__size;
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} else {
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struct.__size = Math.max(struct.__size, result.__size);
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}
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}
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return struct;
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}
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case 'float': return { value: memoryDataView.getFloat32(address, true), __size: 4 };
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case 'uint32_t': return { value: memoryDataView.getUint32(address, true), __size: 4 };
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case 'uint16_t': return { value: memoryDataView.getUint16(address, true), __size: 2 };
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case 'uint8_t': return { value: memoryDataView.getUint16(address, true), __size: 1 };
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default: {
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throw "Unimplemented C data type " + definition.type
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}
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}
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}
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function getTextDimensions(text, font) {
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// re-use canvas object for better performance
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window.canvasContext.font = font;
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let metrics = window.canvasContext.measureText(text);
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return { width: metrics.width, height: metrics.fontBoundingBoxAscent + metrics.fontBoundingBoxDescent };
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}
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function createMainArena(arenaStructAddress, arenaMemoryAddress) {
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let memorySize = instance.exports.Clay_MinMemorySize();
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// Last arg is address to store return value
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instance.exports.Clay_CreateArenaWithCapacityAndMemory(arenaStructAddress, memorySize, arenaMemoryAddress);
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}
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async function init() {
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await Promise.all(fontsById.map(f => document.fonts.load(`12px "${f}"`)));
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window.htmlRoot = document.body.appendChild(document.createElement('div'));
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window.canvasRoot = document.body.appendChild(document.createElement('canvas'));
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window.canvasContext = window.canvasRoot.getContext("2d");
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window.mousePositionXThisFrame = 0;
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window.mousePositionYThisFrame = 0;
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window.mouseWheelXThisFrame = 0;
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window.mouseWheelYThisFrame = 0;
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window.touchDown = false;
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let zeroTimeout = null;
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addEventListener("wheel", (event) => {
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window.mouseWheelXThisFrame = event.deltaX * -0.1;
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window.mouseWheelYThisFrame = event.deltaY * -0.1;
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clearTimeout(zeroTimeout);
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zeroTimeout = setTimeout(() => {
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window.mouseWheelXThisFrame = 0;
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window.mouseWheelYThisFrame = 0;
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}, 10);
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});
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function handleTouch(event) {
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if (event.touches.length === 1) {
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window.touchDown = true;
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window.mousePositionXThisFrame = event.changedTouches[0].pageX;
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window.mousePositionYThisFrame = event.changedTouches[0].pageY;
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}
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}
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document.addEventListener("touchstart", handleTouch);
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document.addEventListener("touchmove", handleTouch);
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document.addEventListener("touchend", () => {
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window.touchDown = false;
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window.mousePositionXThisFrame = 0;
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window.mousePositionYThisFrame = 0;
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})
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document.addEventListener("mousemove", (event) => {
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window.mousePositionXThisFrame = event.x;
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window.mousePositionYThisFrame = event.y;
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});
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document.addEventListener("mousedown", (event) => {
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window.mouseDown = true;
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});
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document.addEventListener("keydown", (event) => {
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if (event.key === "ArrowDown") {
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window.arrowKeyDownPressedThisFrame = true;
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}
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if (event.key === "ArrowUp") {
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window.arrowKeyUpPressedThisFrame = true;
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}
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if (event.key === "d") {
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window.dKeyPressedThisFrame = true;
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}
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});
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const importObject = {
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clay: {
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measureTextFunction: (addressOfDimensions, textToMeasure, addressOfConfig) => {
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let stringLength = memoryDataView.getUint32(textToMeasure, true);
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let pointerToString = memoryDataView.getUint32(textToMeasure + 4, true);
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let textConfig = readStructAtAddress(addressOfConfig, textConfigDefinition);
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let textDecoder = new TextDecoder("utf-8");
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let text = textDecoder.decode(memoryDataView.buffer.slice(pointerToString, pointerToString + stringLength));
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let sourceDimensions = getTextDimensions(text, `${Math.round(textConfig.fontSize.value * GLOBAL_FONT_SCALING_FACTOR)}px ${fontsById[textConfig.fontId.value]}`);
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memoryDataView.setFloat32(addressOfDimensions, sourceDimensions.width, true);
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memoryDataView.setFloat32(addressOfDimensions + 4, sourceDimensions.height, true);
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}
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},
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};
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const { instance } = await WebAssembly.instantiateStreaming(
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fetch("./index.wasm"), importObject
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);
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memoryDataView = new DataView(new Uint8Array(instance.exports.memory.buffer).buffer);
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scratchSpaceAddress = instance.exports.__heap_base.value;
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heapSpaceAddress = instance.exports.__heap_base.value + 1024;
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let arenaAddress = scratchSpaceAddress;
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window.instance = instance;
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createMainArena(arenaAddress, heapSpaceAddress);
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instance.exports.Clay_Initialize(arenaAddress);
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renderCommandSize = getStructTotalSize(renderCommandDefinition);
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renderLoop();
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}
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function renderLoopCanvas() {
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// Note: Rendering to canvas needs to be scaled up by window.devicePixelRatio in both width and height.
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// e.g. if we're working on a device where devicePixelRatio is 2, we need to render
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// everything at width^2 x height^2 resolution, then scale back down with css to get the correct pixel density.
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let capacity = memoryDataView.getUint32(scratchSpaceAddress, true);
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let length = memoryDataView.getUint32(scratchSpaceAddress + 4, true);
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let arrayOffset = memoryDataView.getUint32(scratchSpaceAddress + 8, true);
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window.canvasRoot.width = window.innerWidth * window.devicePixelRatio;
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window.canvasRoot.height = window.innerHeight * window.devicePixelRatio;
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window.canvasRoot.style.width = window.innerWidth + 'px';
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window.canvasRoot.style.height = window.innerHeight + 'px';
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let ctx = window.canvasContext;
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let scale = window.devicePixelRatio;
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for (let i = 0; i < length; i++, arrayOffset += renderCommandSize) {
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let renderCommand = readStructAtAddress(arrayOffset, renderCommandDefinition);
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let boundingBox = renderCommand.boundingBox;
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// note: commandType is packed to uint8_t and has 3 garbage bytes of padding
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switch(renderCommand.commandType.value & 0xff) {
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case (CLAY_RENDER_COMMAND_TYPE_NONE): {
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break;
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}
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case (CLAY_RENDER_COMMAND_TYPE_RECTANGLE): {
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let config = readStructAtAddress(renderCommand.config.value, rectangleConfigDefinition);
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let color = config.color;
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ctx.beginPath();
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window.canvasContext.fillStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
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window.canvasContext.roundRect(
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boundingBox.x.value * scale, // x
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boundingBox.y.value * scale, // y
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boundingBox.width.value * scale, // width
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boundingBox.height.value * scale,
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[config.cornerRadius.topLeft.value * scale, config.cornerRadius.topRight.value * scale, config.cornerRadius.bottomRight.value * scale, config.cornerRadius.bottomLeft.value * scale]) // height;
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ctx.fill();
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ctx.closePath();
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// Handle link clicks
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let linkContents = config.link.length.value > 0 ? textDecoder.decode(new Uint8Array(memoryDataView.buffer.slice(config.link.chars.value, config.link.chars.value + config.link.length.value))) : 0;
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memoryDataView.setUint32(0, renderCommand.id.value, true);
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if (linkContents.length > 0 && (window.mouseDownThisFrame || window.touchDown) && instance.exports.Clay_PointerOver(0)) {
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window.location.href = linkContents;
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}
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break;
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}
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case (CLAY_RENDER_COMMAND_TYPE_BORDER): {
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let config = readStructAtAddress(renderCommand.config.value, borderConfigDefinition);
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ctx.beginPath();
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ctx.moveTo(boundingBox.x.value * scale, boundingBox.y.value * scale);
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// Top Left Corner
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if (config.cornerRadius.topLeft.value > 0) {
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let lineWidth = config.top.width.value;
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let halfLineWidth = lineWidth / 2;
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ctx.moveTo((boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + config.cornerRadius.topLeft.value + halfLineWidth) * scale);
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let color = config.top.color;
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ctx.lineWidth = lineWidth * scale;
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ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
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ctx.arcTo((boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale, (boundingBox.x.value + config.cornerRadius.topLeft.value + halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale, config.cornerRadius.topLeft.value * scale);
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ctx.stroke();
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}
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// Top border
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if (config.top.width.value > 0) {
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let lineWidth = config.top.width.value;
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let halfLineWidth = lineWidth / 2;
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let color = config.top.color;
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ctx.lineWidth = lineWidth * scale;
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ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
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ctx.moveTo((boundingBox.x.value + config.cornerRadius.topLeft.value + halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale);
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ctx.lineTo((boundingBox.x.value + boundingBox.width.value - config.cornerRadius.topRight.value - halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale);
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ctx.stroke();
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}
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// Top Right Corner
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if (config.cornerRadius.topRight.value > 0) {
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let lineWidth = config.top.width.value;
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let halfLineWidth = lineWidth / 2;
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ctx.moveTo((boundingBox.x.value + boundingBox.width.value - config.cornerRadius.topRight.value - halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale);
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let color = config.top.color;
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ctx.lineWidth = lineWidth * scale;
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ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
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ctx.arcTo((boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale, (boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + config.cornerRadius.topRight.value + halfLineWidth) * scale, config.cornerRadius.topRight.value * scale);
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ctx.stroke();
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}
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// Right border
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if (config.right.width.value > 0) {
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let color = config.right.color;
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let lineWidth = config.right.width.value;
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let halfLineWidth = lineWidth / 2;
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ctx.lineWidth = lineWidth * scale;
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ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
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ctx.moveTo((boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + config.cornerRadius.topRight.value + halfLineWidth) * scale);
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ctx.lineTo((boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - config.cornerRadius.topRight.value - halfLineWidth) * scale);
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ctx.stroke();
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}
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// Bottom Right Corner
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if (config.cornerRadius.bottomRight.value > 0) {
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let color = config.top.color;
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let lineWidth = config.top.width.value;
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let halfLineWidth = lineWidth / 2;
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ctx.moveTo((boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - config.cornerRadius.bottomRight.value - halfLineWidth) * scale);
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ctx.lineWidth = lineWidth * scale;
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ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
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ctx.arcTo((boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale, (boundingBox.x.value + boundingBox.width.value - config.cornerRadius.bottomRight.value - halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale, config.cornerRadius.bottomRight.value * scale);
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ctx.stroke();
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}
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// Bottom Border
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if (config.bottom.width.value > 0) {
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let color = config.bottom.color;
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let lineWidth = config.bottom.width.value;
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let halfLineWidth = lineWidth / 2;
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ctx.lineWidth = lineWidth * scale;
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ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
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ctx.moveTo((boundingBox.x.value + config.cornerRadius.bottomLeft.value + halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale);
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ctx.lineTo((boundingBox.x.value + boundingBox.width.value - config.cornerRadius.bottomRight.value - halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale);
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ctx.stroke();
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}
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// Bottom Left Corner
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if (config.cornerRadius.bottomLeft.value > 0) {
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let color = config.bottom.color;
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let lineWidth = config.bottom.width.value;
|
|
let halfLineWidth = lineWidth / 2;
|
|
ctx.moveTo((boundingBox.x.value + config.cornerRadius.bottomLeft.value + halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale);
|
|
ctx.lineWidth = lineWidth * scale;
|
|
ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
|
|
ctx.arcTo((boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale, (boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - config.cornerRadius.bottomLeft.value - halfLineWidth) * scale, config.cornerRadius.bottomLeft.value * scale);
|
|
ctx.stroke();
|
|
}
|
|
// Left Border
|
|
if (config.left.width.value > 0) {
|
|
let color = config.left.color;
|
|
let lineWidth = config.left.width.value;
|
|
let halfLineWidth = lineWidth / 2;
|
|
ctx.lineWidth = lineWidth * scale;
|
|
ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
|
|
ctx.moveTo((boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - config.cornerRadius.bottomLeft.value - halfLineWidth) * scale);
|
|
ctx.lineTo((boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + config.cornerRadius.bottomRight.value + halfLineWidth) * scale);
|
|
ctx.stroke();
|
|
}
|
|
ctx.closePath();
|
|
break;
|
|
}
|
|
case (CLAY_RENDER_COMMAND_TYPE_TEXT): {
|
|
let config = readStructAtAddress(renderCommand.config.value, textConfigDefinition);
|
|
let textContents = renderCommand.text;
|
|
let stringContents = new Uint8Array(memoryDataView.buffer.slice(textContents.chars.value, textContents.chars.value + textContents.length.value));
|
|
let fontSize = config.fontSize.value * GLOBAL_FONT_SCALING_FACTOR * scale;
|
|
ctx.font = `${fontSize}px ${fontsById[config.fontId.value]}`;
|
|
let color = config.textColor;
|
|
ctx.textBaseline = 'middle';
|
|
ctx.fillStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
|
|
ctx.fillText(textDecoder.decode(stringContents), boundingBox.x.value * scale, (boundingBox.y.value + boundingBox.height.value / 2 + 1) * scale);
|
|
break;
|
|
}
|
|
case (CLAY_RENDER_COMMAND_TYPE_SCISSOR_START): {
|
|
window.canvasContext.save();
|
|
window.canvasContext.beginPath();
|
|
window.canvasContext.rect(boundingBox.x.value * scale, boundingBox.y.value * scale, boundingBox.width.value * scale, boundingBox.height.value * scale);
|
|
window.canvasContext.clip();
|
|
window.canvasContext.closePath();
|
|
break;
|
|
}
|
|
case (CLAY_RENDER_COMMAND_TYPE_SCISSOR_END): {
|
|
window.canvasContext.restore();
|
|
break;
|
|
}
|
|
case (CLAY_RENDER_COMMAND_TYPE_IMAGE): {
|
|
let config = readStructAtAddress(renderCommand.config.value, imageConfigDefinition);
|
|
let src = textDecoder.decode(new Uint8Array(memoryDataView.buffer.slice(config.sourceURL.chars.value, config.sourceURL.chars.value + config.sourceURL.length.value)));
|
|
if (!imageCache[src]) {
|
|
imageCache[src] = {
|
|
image: new Image(),
|
|
loaded: false,
|
|
}
|
|
imageCache[src].image.onload = () => imageCache[src].loaded = true;
|
|
imageCache[src].image.src = src;
|
|
} else if (imageCache[src].loaded) {
|
|
ctx.drawImage(imageCache[src].image, boundingBox.x.value * scale, boundingBox.y.value * scale, boundingBox.width.value * scale, boundingBox.height.value * scale);
|
|
}
|
|
break;
|
|
}
|
|
case (CLAY_RENDER_COMMAND_TYPE_CUSTOM): break;
|
|
}
|
|
}
|
|
}
|
|
|
|
function renderLoop(currentTime) {
|
|
const elapsed = currentTime - previousFrameTime;
|
|
previousFrameTime = currentTime;
|
|
instance.exports.UpdateDrawFrame(scratchSpaceAddress, window.innerWidth, window.innerHeight, window.mouseWheelXThisFrame, window.mouseWheelYThisFrame, window.mousePositionXThisFrame, window.mousePositionYThisFrame, window.touchDown, window.mouseDown, elapsed / 1000);
|
|
renderLoopCanvas();
|
|
requestAnimationFrame(renderLoop);
|
|
window.mouseDown = false;
|
|
}
|
|
init();
|
|
</script>
|
|
|
|
<body>
|
|
</body>
|
|
|
|
</html> |