73 lines
2.2 KiB
TypeScript
73 lines
2.2 KiB
TypeScript
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import { Renderable } from './renderer';
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import { Shader, Uniform } from './shader';
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import { Dictionary } from './util';
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function createAndSetupTexture(gl: WebGLRenderingContext): WebGLTexture {
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var texture = gl.createTexture();
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gl.bindTexture(gl.TEXTURE_2D, texture);
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// Set up texture so we can render any size image and so we are
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// working with pixels.
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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return texture;
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}
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export class Foo implements Renderable {
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stages: Stage[];
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textures: WebGLTexture[];
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framebuffers: WebGLFramebuffer[];
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width: number;
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height: number;
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constructor(gl: WebGLRenderingContext, width: number, height: number) {
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this.width = width;
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this.height = height;
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for (let ii = 0; ii < 2; ++ii) {
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const texture = createAndSetupTexture(gl);
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this.textures.push(texture);
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// make the texture the same size as the image
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gl.texImage2D(
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gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0,
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gl.RGBA, gl.UNSIGNED_BYTE, null);
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// Create a framebuffer
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const fbo = gl.createFramebuffer();
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this.framebuffers.push(fbo);
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gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
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// Attach a texture to it.
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gl.framebufferTexture2D(
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gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
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}
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}
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render(gl: WebGLRenderingContext) {
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this.stages.forEach( (item, i) => {
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gl.bindFramebuffer(gl.FRAMEBUFFER, this.framebuffers[i%2]);
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item.render(gl);
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gl.bindTexture(gl.TEXTURE_2D, this.textures[i % 2]);
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});
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}
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}
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class Stage implements Renderable {
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program: Shader;
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uniforms: Dictionary<Uniform>;
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render(gl: WebGLRenderingContext) {
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this.program.bind(gl);
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for (let name in this.uniforms) {
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this.program.uniform(gl, name, this.uniforms[name]);
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}
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}
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}
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