@tolokoban/tgd
Version:
ToloGameDev library for WebGL2
153 lines • 14.2 kB
JavaScript
import { TgdPainterGroup } from "./group.js";
import { webglCreateFramebuffer, webglLookup } from "./../utils/index.js";
export class TgdPainterFramebuffer extends TgdPainterGroup {
constructor(context, options) {
super(options.children);
this.context = context;
this.options = options;
/**
* The framebuffer becomes dirty as soon as the width or height changes.
*/
this.dirty = true;
this._width = 0;
this._height = 0;
this._framebuffer = null;
this._depthBuffer = null;
this._stencilBuffer = null;
const { textureColor0, textureColor1, textureColor2, textureColor3 } = options;
if (!(textureColor0 || textureColor1 || textureColor2 || textureColor3)) {
console.error("[TgdPainterFramebuffer] You gave no color texture in the constructor: nothing will be rendered!", options);
}
this.textureColor0 = nameTexture(textureColor0, "textureColor0");
this.textureColor1 = nameTexture(textureColor1, "textureColor1");
this.textureColor2 = nameTexture(textureColor2, "textureColor2");
this.textureColor3 = nameTexture(textureColor3, "textureColor3");
this.textureDepth = options.textureDepth;
this.onEnter = options.onEnter;
this.onExit = options.onExit;
const { gl } = this.context;
this.drawBuffers = [
this.textureColor0 ? gl.COLOR_ATTACHMENT0 : gl.NONE,
this.textureColor1 ? gl.COLOR_ATTACHMENT1 : gl.NONE,
this.textureColor2 ? gl.COLOR_ATTACHMENT2 : gl.NONE,
this.textureColor3 ? gl.COLOR_ATTACHMENT3 : gl.NONE,
];
}
get width() {
return this._width;
}
set width(v) {
if (this._width === v)
return;
this._width = v;
this.dirty = true;
}
get height() {
return this._height;
}
set height(v) {
if (this._height === v)
return;
this._height = v;
this.dirty = true;
}
updateTextureForColor(tgdTexture, attachment) {
if (!tgdTexture)
return;
const { context, width, height } = this;
const { gl } = context;
tgdTexture.resize(width, height);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + attachment, gl.TEXTURE_2D, tgdTexture.glTexture, 0);
}
createTextureForDepth() {
const tgdTexture = this.textureDepth;
if (!tgdTexture)
return;
const { context, width, height } = this;
const { gl } = context;
tgdTexture.resize(width, height);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, tgdTexture.glTexture, 0);
}
createDepthBuffer(gl) {
if (this.options.depthBuffer === false)
return;
const { width, height } = this;
// Create a Depth Buffer, because the default
// framebuffer has none.
const depthBuffer = gl.createRenderbuffer();
if (!depthBuffer)
throw new Error("Unable to create WebGLRenderBuffer for depth!");
this._depthBuffer = depthBuffer;
gl.bindRenderbuffer(gl.RENDERBUFFER, depthBuffer);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, width, height);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, depthBuffer);
}
createStencilBuffer(gl) {
if (this.options.stencilBuffer !== false) {
const { width, height } = this;
const stencilBuffer = gl.createRenderbuffer();
if (!stencilBuffer)
throw new Error("Unable to create WebGLRenderBuffer for stencil!");
this._stencilBuffer = stencilBuffer;
gl.bindRenderbuffer(gl.RENDERBUFFER, stencilBuffer);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_STENCIL, width, height);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.RENDERBUFFER, stencilBuffer);
}
}
createFramebufferIfNeeded() {
if (!this.dirty)
return;
const { context } = this;
const { gl } = context;
this.delete();
this._framebuffer = webglCreateFramebuffer(gl);
gl.bindFramebuffer(gl.FRAMEBUFFER, this._framebuffer);
this.updateTextureForColor(this.textureColor0, 0);
this.updateTextureForColor(this.textureColor1, 1);
this.updateTextureForColor(this.textureColor2, 2);
this.updateTextureForColor(this.textureColor3, 3);
this.createTextureForDepth();
this.createDepthBuffer(gl);
this.createStencilBuffer(gl);
const status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
if (status !== gl.FRAMEBUFFER_COMPLETE) {
console.error(`Your Framebuffer is incomplete: ${webglLookup(status)}!`);
}
this.dirty = false;
}
paint(time, delay) {
const { context, options } = this;
const { gl } = context;
const { viewportMatchingScale = 1 } = options;
this.width = Math.round(context.width * viewportMatchingScale);
this.height = Math.round(context.height * viewportMatchingScale);
this.createFramebufferIfNeeded();
gl.bindFramebuffer(gl.FRAMEBUFFER, this._framebuffer);
gl.drawBuffers(this.drawBuffers);
super.paint(time, delay);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
}
delete() {
const { context, _framebuffer, _depthBuffer, _stencilBuffer } = this;
const { gl } = context;
if (_framebuffer) {
gl.deleteFramebuffer(_framebuffer);
this._framebuffer = null;
}
if (_depthBuffer) {
gl.deleteRenderbuffer(_depthBuffer);
this._depthBuffer = null;
}
if (_stencilBuffer) {
gl.deleteRenderbuffer(_stencilBuffer);
this._stencilBuffer = null;
}
}
}
function nameTexture(texture, name) {
if (texture) {
texture.name += `/${name}`;
}
return texture;
}
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