97 lines
2.3 KiB
TypeScript
97 lines
2.3 KiB
TypeScript
import { enableExtension } from '../helper/enable-extension';
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import { FrameBuffer } from './frame-buffer';
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export class IntermediateFrameBuffer extends FrameBuffer {
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private frameTexture: WebGLTexture;
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private floatLinearEnabled = false;
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constructor(gl: WebGL2RenderingContext) {
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super(gl);
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enableExtension(gl, 'EXT_color_buffer_float');
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try {
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enableExtension(gl, 'OES_texture_float_linear');
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this.floatLinearEnabled = true;
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} catch {
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// it's okay
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}
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const texture = this.gl.createTexture();
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if (!texture) {
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throw new Error('Could not create texture');
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}
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this.frameTexture = texture;
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this.configureTexture();
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const frameBuffer = this.gl.createFramebuffer();
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if (!frameBuffer) {
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throw new Error('Could not create frame buffer');
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}
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this.frameBuffer = frameBuffer;
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this.configureFrameBuffer();
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this.setSize();
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}
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public get colorTexture(): WebGLTexture {
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return this.frameTexture;
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}
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public setSize(): boolean {
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const hasChanged = super.setSize();
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if (hasChanged) {
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this.gl.bindTexture(this.gl.TEXTURE_2D, this.frameTexture);
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this.gl.texImage2D(
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this.gl.TEXTURE_2D,
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0,
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this.gl.RG16F,
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this.size.x,
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this.size.y,
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0,
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this.gl.RG,
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this.gl.FLOAT,
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null
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);
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}
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return hasChanged;
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}
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private configureTexture() {
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this.gl.bindTexture(this.gl.TEXTURE_2D, this.frameTexture);
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this.gl.texParameteri(
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this.gl.TEXTURE_2D,
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this.gl.TEXTURE_MAG_FILTER,
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this.floatLinearEnabled ? this.gl.LINEAR : this.gl.NEAREST
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);
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this.gl.texParameteri(
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this.gl.TEXTURE_2D,
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this.gl.TEXTURE_MIN_FILTER,
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this.floatLinearEnabled ? this.gl.LINEAR : this.gl.NEAREST
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);
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this.gl.texParameteri(
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this.gl.TEXTURE_2D,
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this.gl.TEXTURE_WRAP_S,
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this.gl.CLAMP_TO_EDGE
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);
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this.gl.texParameteri(
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this.gl.TEXTURE_2D,
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this.gl.TEXTURE_WRAP_T,
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this.gl.CLAMP_TO_EDGE
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);
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}
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private configureFrameBuffer() {
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this.gl.bindFramebuffer(this.gl.FRAMEBUFFER, this.frameBuffer);
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const attachmentPoint = this.gl.COLOR_ATTACHMENT0;
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this.gl.framebufferTexture2D(
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this.gl.FRAMEBUFFER,
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attachmentPoint,
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this.gl.TEXTURE_2D,
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this.frameTexture,
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0
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);
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}
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}
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