@tolokoban/tgd
Version:
ToloGameDev library for WebGL2
69 lines • 6.47 kB
JavaScript
export class TgdTextureCubeImpl {
constructor(context, options) {
this.context = context;
this._width = 0;
this._height = 0;
this.numberOfImagesToLoad = 6;
const { gl } = context;
const texture = gl.createTexture();
if (!texture)
throw new Error("Unable to create a WebGLTexture!");
this.texture = texture;
this.loadImage(gl.TEXTURE_CUBE_MAP_POSITIVE_X, options.imagePosX);
this.loadImage(gl.TEXTURE_CUBE_MAP_NEGATIVE_X, options.imageNegX);
this.loadImage(gl.TEXTURE_CUBE_MAP_POSITIVE_Y, options.imagePosY);
this.loadImage(gl.TEXTURE_CUBE_MAP_NEGATIVE_Y, options.imageNegY);
this.loadImage(gl.TEXTURE_CUBE_MAP_POSITIVE_Z, options.imagePosZ);
this.loadImage(gl.TEXTURE_CUBE_MAP_NEGATIVE_Z, options.imageNegZ);
}
delete() {
this.context.gl.deleteTexture(this.texture);
}
get ready() {
return this.numberOfImagesToLoad === 0;
}
get width() {
return this._width;
}
get height() {
return this._height;
}
bind() {
const { gl } = this.context;
gl.bindTexture(gl.TEXTURE_CUBE_MAP, this.texture);
}
activate(unit, program, uniformName) {
if (!this.ready)
return;
const { context, texture } = this;
const { gl } = context;
gl.activeTexture(gl.TEXTURE0 + unit);
gl.bindTexture(gl.TEXTURE_CUBE_MAP, texture);
program.uniform1i(uniformName, unit);
}
loadImage(target, image) {
const { width, height } = image;
if (width !== height) {
throw new Error(`Images in a CubeMap must be squares, but we got ${width}×${height}!`);
}
if (this._width === 0) {
this._width = width;
this._height = height;
}
else if (this._width !== width || this._height !== height) {
throw new Error(`Images in a CubeMap must all have the same size, but we got ${this._width}×${this._height} and ${width}×${height}!`);
}
const { context, texture } = this;
const { gl } = context;
gl.bindTexture(gl.TEXTURE_CUBE_MAP, texture);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, image instanceof Image);
gl.texImage2D(target, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
this.numberOfImagesToLoad--;
if (this.numberOfImagesToLoad === 0) {
gl.generateMipmap(gl.TEXTURE_CUBE_MAP);
gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR);
context.paint();
}
}
}
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