mirror of
https://github.com/dyuri/repa-shader.git
synced 2025-12-16 11:14:25 +00:00
106 lines
2.7 KiB
HTML
106 lines
2.7 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title><repa-shader> demo</title>
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<script type="module" src="../src/repa-texture.js"></script>
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<script type="module" src="../src/repa-shader.js"></script>
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<style>
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body {
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margin: 0;
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padding: 0;
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background: repeating-linear-gradient(45deg, #333, #333 10px, #666 10px, #666 20px);
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min-height: 100vh;
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display: flex;
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align-items: center;
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justify-content: center;
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flex-direction: column;
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}
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#fsinput {
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width: 90vw;
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height: 50vh;
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}
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#cnt {
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display: flex;
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flex-direction: row;
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}
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label {
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display: block;
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padding: .5rem 1rem;
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background: white;
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}
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#drwcnt {
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position: relative;
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}
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#drwcnt .tooltip {
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position: absolute;
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left: 0;
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right: 0;
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top: 0;
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background-color: rgba(0, 0, 0, .5);
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color: white;
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padding: .5em;
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text-align: center;
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pointer-events: none;
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}
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</style>
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</head>
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<body>
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<div id="cnt">
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<div id="drwcnt">
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<canvas id="drawing" width=512 height=512></canvas>
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<div class="tooltip">Draw here!</div>
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</div>
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<repa-shader id="demoshader" fs-input="fsinput" alpha mouse snippets="noise.glsl" width=512 height=512>
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<repa-texture ref="drawing"></repa-texture>
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<script type="x-shader/x-fragment">
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void main() {
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vec2 uv = gl_FragCoord.xy / resolution.xy;
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vec3 col = .5 + .5 * cos(uv.xyx + time + vec3(0, 2, 4));
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col *= texture(texture0, vec2(uv.x, 1.-uv.y)).rgb;
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float dist = distance(uv, mouse.xy);
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float circle = smoothstep(.1, .2, dist) * .5 + .5;
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vec4 acolor = vec4(col * circle, circle);
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outColor = vec4(acolor);
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}
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</script>
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</repa-shader>
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</div>
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<div>
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<label for="reverse_draw"><input id="reverse_draw" type="checkbox"> Reverse draw</label>
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</div>
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<div>
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<textarea id="fsinput"></textarea>
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</div>
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<button id="update">Update</button>
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<script>
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const updateButton = document.getElementById('update');
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updateButton.addEventListener('click', () => {
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const fsinput = document.getElementById('fsinput');
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const shader = document.querySelector('repa-shader');
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shader.render(fsinput.value);
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});
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// draw on canvas with mouse
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const canvas = document.getElementById("drawing");
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const ctx = canvas.getContext("2d");
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ctx.fillStyle = "black";
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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const draw = (e) => {
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if (e.buttons) {
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const ctx = canvas.getContext("2d");
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const reverseDraw = document.getElementById("reverse_draw").checked;
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ctx.fillStyle = reverseDraw ? 'black' : 'white';
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ctx.fillRect(e.offsetX - 5, e.offsetY - 5, 10, 10);
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}
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};
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canvas.addEventListener("mousedown", draw);
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canvas.addEventListener('mousemove', draw);
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</script>
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</body>
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</html>
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