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Create AtlasPage

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This commit is contained in:
Daniel Imms
2022-10-28 19:08:33 -07:00
parent 84ab6a49c4
commit 6b37187b4d
3 changed files with 69 additions and 57 deletions
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addons/xterm-addon-webgl/src/GlyphRenderer.ts
+31 -31
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@@ -77,6 +77,7 @@ void main() {
const INDICES_PER_CELL = 11;
const BYTES_PER_CELL = INDICES_PER_CELL * Float32Array.BYTES_PER_ELEMENT;
const CELL_POSITION_INDICES = 2;
const MAX_ATLAS_PAGES = 8;
// Work variables to avoid garbage collection
let $i = 0;
@@ -90,8 +91,7 @@ export class GlyphRenderer extends Disposable {
private readonly _projectionLocation: WebGLUniformLocation;
private readonly _resolutionLocation: WebGLUniformLocation;
private readonly _textureLocation: WebGLUniformLocation;
private readonly _atlasTexture: WebGLTexture;
private readonly _atlasTexture1: WebGLTexture;
private readonly _atlasTextures: WebGLTexture[];
private readonly _attributesBuffer: WebGLBuffer;
private _atlas: ITextureAtlas | undefined;
@@ -166,22 +166,18 @@ export class GlyphRenderer extends Disposable {
gl.vertexAttribPointer(VertexAttribLocations.CELL_POSITION, 2, gl.FLOAT, false, BYTES_PER_CELL, 9 * Float32Array.BYTES_PER_ELEMENT);
gl.vertexAttribDivisor(VertexAttribLocations.CELL_POSITION, 1);
// Setup empty texture atlas
this._atlasTexture = throwIfFalsy(gl.createTexture());
this.register(toDisposable(() => gl.deleteTexture(this._atlasTexture)));
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, this._atlasTexture);
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, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array([0, 0, 255, 255]));
this._atlasTexture1 = throwIfFalsy(gl.createTexture());
this.register(toDisposable(() => gl.deleteTexture(this._atlasTexture1)));
gl.activeTexture(gl.TEXTURE0 + 1);
gl.bindTexture(gl.TEXTURE_2D, this._atlasTexture1);
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, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array([255, 0, 0, 255]));
// Setup empty textures for all potential atlas pages
this._atlasTextures = [];
for (let i = 0; i < MAX_ATLAS_PAGES; i++) {
const texture = throwIfFalsy(gl.createTexture());
this.register(toDisposable(() => gl.deleteTexture(texture)));
gl.activeTexture(gl.TEXTURE0 + i);
gl.bindTexture(gl.TEXTURE_2D, texture);
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, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array([255, 0, 0, 255]));
this._atlasTextures[i] = texture;
}
// Allow drawing of transparent texture
gl.enable(gl.BLEND);
@@ -334,15 +330,17 @@ export class GlyphRenderer extends Disposable {
const layerTextureUnits = new Int32Array([0, 1]);
gl.uniform1iv(this._textureLocation, layerTextureUnits);
gl.activeTexture(gl.TEXTURE0 + 0);
gl.bindTexture(gl.TEXTURE_2D, this._atlasTexture);
gl.bindTexture(gl.TEXTURE_2D, this._atlasTextures[0]);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, this._atlas.cacheCanvas);
gl.generateMipmap(gl.TEXTURE_2D);
// TODO: Check if the particular texture page changed
gl.activeTexture(gl.TEXTURE0 + 1);
gl.bindTexture(gl.TEXTURE_2D, this._atlasTexture1);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, this._atlas.cacheCanvas1!);
gl.generateMipmap(gl.TEXTURE_2D);
if (this._atlas.pages.length > 1) {
// TODO: Check if the particular texture page changed
gl.activeTexture(gl.TEXTURE0 + 1);
gl.bindTexture(gl.TEXTURE_2D, this._atlasTextures[1]);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, this._atlas.pages[1]);
gl.generateMipmap(gl.TEXTURE_2D);
}
}
@@ -359,18 +357,20 @@ export class GlyphRenderer extends Disposable {
this._atlas = atlas;
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, this._atlasTexture);
gl.bindTexture(gl.TEXTURE_2D, this._atlasTextures[0]);
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, atlas.cacheCanvas);
gl.generateMipmap(gl.TEXTURE_2D);
gl.activeTexture(gl.TEXTURE0 + 1);
gl.bindTexture(gl.TEXTURE_2D, this._atlasTexture1);
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, atlas.cacheCanvas1!);
gl.generateMipmap(gl.TEXTURE_2D);
if (atlas.pages.length > 1) {
gl.activeTexture(gl.TEXTURE0 + 1);
gl.bindTexture(gl.TEXTURE_2D, this._atlasTextures[1]);
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, atlas.pages[1]);
gl.generateMipmap(gl.TEXTURE_2D);
}
}
public setDimensions(dimensions: IRenderDimensions): void {