1 files changed, 38 insertions, 0 deletions
diff --git a/src/Framebuffer.ts b/src/Framebuffer.ts
new file mode 100644
index 0000000..b9926d2
--- /dev/null
+++ b/src/Framebuffer.ts
@@ -0,0 +1,38 @@
+import {Colour} from './Colour';
+
+export class Framebuffer {
+  readonly width: number;
+  readonly height: number;
+  readonly canvasContext: CanvasRenderingContext2D;
+  readonly canvasImageData: ImageData;
+
+  constructor(width: number, height: number) {
+    this.width = width;
+    this.height = height;
+
+    const canvas = document.getElementById(
+      'render-output'
+    ) as HTMLCanvasElement;
+
+    canvas.width = this.width;
+    canvas.height = this.height;
+
+    this.canvasContext = canvas.getContext('2d')!;
+    this.canvasImageData = this.canvasContext.createImageData(
+      this.width,
+      this.height
+    );
+  }
+
+  writePixelAt(x: number, y: number, colour: Colour) {
+    const startIdx = (y * this.width + x) * 4;
+    this.canvasImageData.data[startIdx] = colour.r;
+    this.canvasImageData.data[startIdx + 1] = colour.g;
+    this.canvasImageData.data[startIdx + 2] = colour.b;
+    this.canvasImageData.data[startIdx + 3] = 255; // No A
+  }
+
+  flush() {
+    this.canvasContext.putImageData(this.canvasImageData, 0, 0);
+  }
+}