1 files changed, 157 insertions, 0 deletions
diff --git a/web/pw-frontend/src/lib/visualizer/webgl/renderer.ts b/web/pw-frontend/src/lib/visualizer/webgl/renderer.ts
new file mode 100644
index 0000000..c3b219f
--- /dev/null
+++ b/web/pw-frontend/src/lib/visualizer/webgl/renderer.ts
@@ -0,0 +1,157 @@
+import type { IndexBuffer } from './buffer';
+import type { VertexArray } from './vertexBufferLayout';
+import type { Texture } from './texture';
+import type { Dictionary } from './util';
+import type { Shader, Uniform } from './shader';
+import { Uniform1i } from './shader';
+
+function sortedIndex(array, value) {
+    var low = 0,
+        high = array.length;
+
+    while (low < high) {
+        var mid = (low + high) >>> 1;
+        if (array[mid] < value) low = mid + 1;
+        else high = mid;
+    }
+    return low;
+}
+
+export interface Renderable {
+    getUniforms() : Dictionary<Uniform>;
+    render(gl: WebGLRenderingContext): void;
+    updateVAOBuffer(gl: WebGLRenderingContext, index: number, data: number[]);
+    updateIndexBuffer(gl: WebGLRenderingContext, data: number[]);
+}
+
+export class DefaultRenderable implements Renderable {
+    ibo: IndexBuffer;
+    va: VertexArray;
+    shader: Shader;
+    textures: Texture[];
+    uniforms: Dictionary<Uniform>;
+
+    constructor(
+        ibo: IndexBuffer,
+        va: VertexArray,
+        shader: Shader,
+        textures: Texture[],
+        uniforms: Dictionary<Uniform>,
+    ) {
+        this.ibo = ibo;
+        this.va = va;
+        this.shader = shader;
+        this.textures = textures;
+        this.uniforms = uniforms;
+    }
+
+    getUniforms(): Dictionary<Uniform> {
+        return this.uniforms;
+    }
+
+    updateVAOBuffer(gl: WebGLRenderingContext, index: number, data: number[]) {
+        this.va.updateBuffer(gl, index, data);
+    }
+
+    updateIndexBuffer(gl: WebGLRenderingContext, data: number[]) {
+        this.ibo.updateData(gl, data);
+    }
+
+    render(gl: WebGLRenderingContext): void {
+
+        const indexBuffer = this.ibo;
+        const vertexArray = this.va;
+        const uniforms = this.uniforms;
+
+        const shader = this.shader;
+        const textures = this.textures;
+        let texLocation = 0;
+
+        for (let texture of textures) {
+
+            shader.uniform(gl, texture.name, new Uniform1i(texLocation));
+            texture.bind(gl, texLocation);
+
+            texLocation ++;
+            // if (texLocation > maxTextures) {
+            //     console.error("Using too many textures, this is not supported yet\nUndefined behaviour!");
+            // }
+        }
+
+        if (vertexArray && shader && uniforms) {
+            for(let key in uniforms) {
+                shader.uniform(gl, key, uniforms[key]);
+            }
+
+            vertexArray.bind(gl, shader);
+
+            if (indexBuffer) {
+                indexBuffer.bind(gl);
+                gl.drawElements(gl.TRIANGLES, indexBuffer.getCount(), gl.UNSIGNED_SHORT, 0);
+            } else {
+                console.error("IndexBuffer is required to render, for now");
+            }
+        }
+
+    }
+}
+
+export class Renderer {
+    renderables: { [id: number] : [Renderable, boolean][]; };
+    renderable_layers: number[];
+
+    constructor() {
+        this.renderables = {};
+        this.renderable_layers = [];
+    }
+
+    updateUniform(i: number, f: (uniforms: Dictionary<Uniform>) => void, layer=0, ) {
+        f(this.renderables[layer][i][0].getUniforms());
+    }
+
+    disableRenderable(i: number, layer=0) {
+        this.renderables[layer][i][1] = false;
+    }
+
+    enableRenderable(i: number, layer=0) {
+        this.renderables[layer][i][1] = true;
+    }
+
+    addRenderable(item: Renderable, layer=0): number {
+        if(!this.renderables[layer]) {
+            const idx = sortedIndex(this.renderable_layers, layer);
+            this.renderable_layers.splice(idx, 0, layer);
+            this.renderables[layer] = [];
+        }
+
+        this.renderables[layer].push([item, true]);
+        return this.renderables[layer].length - 1;
+    }
+
+    addToDraw(indexBuffer: IndexBuffer, vertexArray: VertexArray, shader: Shader, uniforms?: Dictionary<Uniform>, texture?: Texture[], layer=0): number {
+        return this.addRenderable(
+            new DefaultRenderable(
+                indexBuffer,
+                vertexArray,
+                shader,
+                texture || [],
+                uniforms || {},
+            ), layer
+        );
+    }
+
+    render(gl: WebGLRenderingContext, frameBuffer?: WebGLFramebuffer, width?: number, height?: number) {
+        gl.bindFramebuffer(gl.FRAMEBUFFER, frameBuffer);
+        gl.viewport(0, 0, width || gl.canvas.width, height || gl.canvas.height);
+        gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+
+        const maxTextures = gl.getParameter(gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS);
+
+        for (let layer of this.renderable_layers) {
+            for (let [r, e] of this.renderables[layer]) {
+                if (!e) continue;
+                r.render(gl);
+            }
+        }
+    }
+}