Yeomai/SpineViewer
1
0 Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

预览一致性修复

Browse Source
This commit is contained in:
tianmo committed 2026-09-11 00:33:43 +08:00
1 parent 11b1c95d98
commit f0c7e27552
7 files changed
+189 -36
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

js/spine-webgl-rasterizer.js
+59 -24
View File
@@ -1,5 +1,18 @@
'use strict';
// Decode file bytes without the Canvas 2D premultiply/unpremultiply round trip.
// In low-alpha PMA pixels that round trip destroys RGB precision before blending.
const preparedTextures = new WeakMap();
async function prepareTexture(image, blob) {
if (typeof createImageBitmap !== 'function') return;
const options = { colorSpaceConversion: 'none' };
const [pma, straight] = await Promise.all([
createImageBitmap(blob, { ...options, premultiplyAlpha: 'none' }),
createImageBitmap(blob, { ...options, premultiplyAlpha: 'premultiply' })
]);
preparedTextures.set(image, { pma, straight });
}
// Rasterize adjacent mesh triangles together, with GPU edge ownership rules.
// Canvas clip()+drawImage() anti-aliases each triangle separately and exposes
// the background along shared edges, which looks like a wireframe overlay.
@@ -21,50 +34,64 @@ function createRasterizer(context) {
const vertex = shader(gl.VERTEX_SHADER, `
attribute vec2 position;
attribute vec2 uv;
attribute vec4 light;
attribute vec4 dark;
uniform vec2 resolution;
varying vec2 textureUV;
varying vec4 lightColor;
varying vec4 darkColor;
void main() {
vec2 p = position / resolution * 2.0 - 1.0;
gl_Position = vec4(p.x, -p.y, 0.0, 1.0);
textureUV = uv;
lightColor = light; darkColor = dark;
}`);
const fragment = shader(gl.FRAGMENT_SHADER, `
precision mediump float;
uniform sampler2D image;
uniform float opacity;
varying vec2 textureUV;
varying vec4 lightColor;
varying vec4 darkColor;
void main() {
vec4 color = texture2D(image, textureUV);
float alpha = color.a * opacity;
gl_FragColor = vec4(color.rgb * opacity, alpha);
float alpha = color.a * lightColor.a;
// Textures are PMA in GPU memory. Light/dark colors arrive straight.
vec3 rgb = (color.rgb * lightColor.rgb + (color.a - color.rgb) * darkColor.rgb) * lightColor.a;
gl_FragColor = vec4(rgb, alpha);
}`);
const program = gl.createProgram(); gl.attachShader(program, vertex); gl.attachShader(program, fragment); gl.linkProgram(program);
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) throw new Error(gl.getProgramInfoLog(program));
gl.deleteShader(vertex); gl.deleteShader(fragment);
const buffer = gl.createBuffer();
const position = gl.getAttribLocation(program, 'position'), uv = gl.getAttribLocation(program, 'uv');
const resolution = gl.getUniformLocation(program, 'resolution'), opacity = gl.getUniformLocation(program, 'opacity');
const resolution = gl.getUniformLocation(program, 'resolution');
const light = gl.getAttribLocation(program, 'light'), dark = gl.getAttribLocation(program, 'dark');
const textures = new Map();
let coordinates = [], currentImage = null, currentAlpha = 1, currentMode = 'source-over', transform;
let disposed = false, lost = false;
let premultipliedAlpha = false;
canvas.addEventListener('webglcontextlost', event => { event.preventDefault(); lost = true; });
function texture(image) {
if (textures.has(image) && image !== context.canvas) return textures.get(image);
const t = textures.get(image) || gl.createTexture(); gl.bindTexture(gl.TEXTURE_2D, t);
const pma = image !== context.canvas && premultipliedAlpha;
let pair = textures.get(image);
if (!pair) { pair = {}; textures.set(image, pair); }
const key = pma ? 'pma' : 'straight';
if (pair[key] && image !== context.canvas) return pair[key];
const t = pair[key] || gl.createTexture(); gl.bindTexture(gl.TEXTURE_2D, t);
// Premultiply before interpolation so translucent edges do not darken.
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, !pma);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
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.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
textures.set(image, t); return t;
const prepared = preparedTextures.get(image);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, prepared ? prepared[key] : image);
pair[key] = t; return t;
}
function flush() {
if (!coordinates.length) return;
gl.bindTexture(gl.TEXTURE_2D, texture(currentImage));
gl.uniform1f(opacity, currentAlpha);
// Premultiplied RGB factors; keep source-over alpha independently.
const factors = currentMode === 'lighter' ? [gl.ONE, gl.ONE]
: currentMode === 'multiply' ? [gl.DST_COLOR, gl.ONE_MINUS_SRC_ALPHA]
@@ -72,12 +99,13 @@ function createRasterizer(context) {
: [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
gl.blendFuncSeparate(factors[0], factors[1], gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(coordinates), gl.STREAM_DRAW);
gl.drawArrays(gl.TRIANGLES, 0, coordinates.length / 4);
gl.drawArrays(gl.TRIANGLES, 0, coordinates.length / 12);
coordinates.length = 0;
}
return {
begin() {
begin(pma = false) {
if (disposed || lost || gl.isContextLost()) return false;
premultipliedAlpha = pma;
const target = context.canvas;
if (canvas.width !== target.width) canvas.width = target.width;
if (canvas.height !== target.height) canvas.height = target.height;
@@ -85,8 +113,10 @@ function createRasterizer(context) {
gl.viewport(0, 0, canvas.width, canvas.height);
gl.clearColor(0, 0, 0, 0); gl.clear(gl.COLOR_BUFFER_BIT);
gl.useProgram(program); gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.enableVertexAttribArray(position); gl.vertexAttribPointer(position, 2, gl.FLOAT, false, 16, 0);
gl.enableVertexAttribArray(uv); gl.vertexAttribPointer(uv, 2, gl.FLOAT, false, 16, 8);
gl.enableVertexAttribArray(position); gl.vertexAttribPointer(position, 2, gl.FLOAT, false, 48, 0);
gl.enableVertexAttribArray(uv); gl.vertexAttribPointer(uv, 2, gl.FLOAT, false, 48, 8);
gl.enableVertexAttribArray(light); gl.vertexAttribPointer(light, 4, gl.FLOAT, false, 48, 16);
gl.enableVertexAttribArray(dark); gl.vertexAttribPointer(dark, 4, gl.FLOAT, false, 48, 32);
gl.uniform2f(resolution, canvas.width, canvas.height);
gl.activeTexture(gl.TEXTURE0); gl.uniform1i(gl.getUniformLocation(program, 'image'), 0);
gl.enable(gl.BLEND); gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
@@ -94,19 +124,23 @@ function createRasterizer(context) {
// checkerboard background). CSS backgrounds cannot participate in blending.
currentImage = target; currentAlpha = 1; currentMode = 'source-over';
const w = canvas.width, h = canvas.height;
coordinates.push(0,0,0,0, w,0,1,0, w,h,1,1, 0,0,0,0, w,h,1,1, 0,h,0,1);
for (const vertex of [[0,0,0,0],[w,0,1,0],[w,h,1,1],[0,0,0,0],[w,h,1,1],[0,h,0,1]])
coordinates.push(...vertex, 1,1,1,1, 0,0,0,0);
flush(); currentImage = null;
return true;
},
triangle(image, x0, y0, u0, v0, x1, y1, u1, v1, x2, y2, u2, v2) {
triangle(image, x0, y0, u0, v0, x1, y1, u1, v1, x2, y2, u2, v2, colors, darkColors) {
const alpha = context.globalAlpha;
const mode = context.globalCompositeOperation || 'source-over';
if (image !== currentImage || alpha !== currentAlpha || mode !== currentMode) { flush(); currentImage = image; currentAlpha = alpha; currentMode = mode; }
const t = transform;
coordinates.push(
t.a * x0 + t.c * y0 + t.e, t.b * x0 + t.d * y0 + t.f, u0, v0,
t.a * x1 + t.c * y1 + t.e, t.b * x1 + t.d * y1 + t.f, u1, v1,
t.a * x2 + t.c * y2 + t.e, t.b * x2 + t.d * y2 + t.f, u2, v2);
const points = [[x0,y0,u0,v0],[x1,y1,u1,v1],[x2,y2,u2,v2]];
for (let i=0; i<3; i++) {
const [x,y,u,v] = points[i], j=i*4;
coordinates.push(t.a*x+t.c*y+t.e, t.b*x+t.d*y+t.f, u,v,
...(colors ? colors.slice(j,j+4) : [1,1,1,alpha]),
...(darkColors ? darkColors.slice(j,j+4) : [0,0,0,0]));
}
},
end() {
flush();
@@ -116,7 +150,7 @@ function createRasterizer(context) {
},
dispose() {
if (disposed) return; disposed = true;
for (const value of textures.values()) gl.deleteTexture(value);
for (const pair of textures.values()) for (const value of Object.values(pair)) gl.deleteTexture(value);
textures.clear(); gl.deleteBuffer(buffer); gl.deleteProgram(program);
const extension = gl.getExtension('WEBGL_lose_context'); if (extension) extension.loseContext();
}
@@ -129,14 +163,15 @@ function attach(renderer, context) {
if (!rasterizer) return renderer;
const draw = renderer.draw.bind(renderer), triangle = renderer.drawTriangle.bind(renderer);
renderer.draw = skeleton => {
if (!rasterizer.begin()) return draw(skeleton);
if (!rasterizer.begin(!!renderer.premultipliedAlpha)) return draw(skeleton);
renderer.gpuDrawing = true;
renderer.drawTriangle = rasterizer.triangle;
try { draw(skeleton); rasterizer.end(); }
finally { renderer.drawTriangle = triangle; }
finally { renderer.drawTriangle = triangle; renderer.gpuDrawing = false; }
};
renderer.dispose = rasterizer.dispose;
renderer.rasterization = 'webgl';
return renderer;
}
module.exports = { createRasterizer, attach };
module.exports = { createRasterizer, attach, prepareTexture };