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Avoid setting uniforms every frame

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This commit is contained in:
Daniel Imms
2022-10-29 14:26:51 -07:00
parent c257a7247e
commit 86ccd709bf
1 changed files with 8 additions and 9 deletions
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addons/xterm-addon-webgl/src/GlyphRenderer.ts
+8 -9
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@@ -178,7 +178,13 @@ 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 textures for all potential atlas pages
// Setup static uniforms
gl.useProgram(this._program);
gl.uniform1iv(this._textureLocation, new Int32Array([0, 1, 2, 3, 4, 5, 6, 7]));
gl.uniformMatrix4fv(this._projectionLocation, false, PROJECTION_MATRIX);
// Setup 1x1 red pixel textures for all potential atlas pages, if one of these invalid textures
// is ever drawn it will show characters as red rectangles.
this._atlasTextures = [];
for (let i = 0; i < MAX_ATLAS_PAGES; i++) {
const texture = throwIfFalsy(gl.createTexture());
@@ -299,6 +305,7 @@ export class GlyphRenderer extends Disposable {
public handleResize(): void {
const gl = this._gl;
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
gl.uniform2f(this._resolutionLocation, gl.canvas.width, gl.canvas.height);
this.clear();
}
@@ -335,10 +342,6 @@ export class GlyphRenderer extends Disposable {
gl.bindBuffer(gl.ARRAY_BUFFER, this._attributesBuffer);
gl.bufferData(gl.ARRAY_BUFFER, activeBuffer.subarray(0, bufferLength), gl.STREAM_DRAW);
// TODO: Only do this once
const layerTextureUnits = new Int32Array([0, 1, 2, 3, 4, 5, 6, 7]);
gl.uniform1iv(this._textureLocation, layerTextureUnits);
// Bind the atlas page texture if they have changed
for (let i = 0; i < this._atlas.pages.length; i++) {
if (this._atlas.pages[i].hasCanvasChanged) {
@@ -350,10 +353,6 @@ export class GlyphRenderer extends Disposable {
}
}
// Set uniforms
gl.uniformMatrix4fv(this._projectionLocation, false, PROJECTION_MATRIX);
gl.uniform2f(this._resolutionLocation, gl.canvas.width, gl.canvas.height);
// Draw the viewport
gl.drawElementsInstanced(gl.TRIANGLE_STRIP, 4, gl.UNSIGNED_BYTE, 0, bufferLength / INDICES_PER_CELL);
}