| <html> |
| <head> |
| <title>Canvas 3D</title> |
| </head> |
| <body> |
| <canvas id='canvas1' style="border: 1px solid black;"></canvas> |
| </body> |
| <script type="text/javascript"> |
| var canvas = document.getElementById('canvas1'); |
| var ctx = canvas.getContext('webgl'); |
| // Make the canvas very large but still falling inside the viewport; |height| |
| // also has to account for the Shelf (taskbar) at the bottom. |
| const dpr = window.devicePixelRatio || 1; |
| canvas.width = (window.innerWidth / dpr) * 0.9 / dpr; |
| canvas.height = (window.innerHeight / dpr) * 0.9 / dpr; |
| |
| var draw_passes_count = 0; |
| |
| function draw_pass() { |
| // Consider a seeded random number generator if there are reproducibility |
| // problems. |
| ctx.clearColor(0, Math.random(), 0, 1.0); |
| ctx.clear(ctx.COLOR_BUFFER_BIT); |
| draw_passes_count++; |
| } |
| setInterval(draw_pass, 1000); |
| |
| function get_draw_passes_count() { |
| return draw_passes_count; |
| } |
| |
| </script> |
| </html> |
