Today is the day we finally move training of our simple model onto the GPU. As I’ve mentioned before, I’ll be using the Vulkan API for that. The shaders - the actual programs that run on the GPU - will be written in GLSL, a simple C-like language. Vulkan is famous for its complexity and verbosity, but in return it offers an incredible amount of control. Writing GPU code is tough, and writing GPU code in Vulkan is even tougher. Read more

Last time, we ended with a working naive implementation of a simple neural network. We also briefly touched on the performance difference between floats and doubles. But as you may remember, the ultimate goal is to train the network on a GPU using Vulkan Compute. In Vulkan Compute shaders (I’ll use GLSL as the shader language), we don’t have anything comparable to the C++ standard library. In fact, we have very little - just basic arithmetic operations and a small set of built-in functions. Read more

Last time I added a brief note about choosing float over double, where I said that float is better - because we’ll work mostly with small numbers, so the precision is not an issue, and because GPUs prefer floats (at least, mass-consumer GPUs). Also, logic says that float should be faster - addition and subtraction should take the same amount of cycles, but memory throughput should be better with float, since more data can fit into a single cache line. Read more

I don’t remember when AI became a big thing. It didn’t happen suddenly, but it did happen fast. Three or four years ago, my friend - a big AI fan but not a programmer - told me he didn’t need to learn programming languages because ChatGPT could write programs. I asked him to create a simple ping-pong game with it; the language didn’t matter. He couldn’t - the tool didn’t understand what he wanted, produced incorrect code, and it was impossible to tell it to fix just that specific part. Read more

In the previous step, we finally got our first image. But unfortunately, it was broken - the polygons were drawn in the incorrect order. I omit the depth buffer management to make the complex Vulkan a little bit simpler. Also, I wanted to show how to change the existing renderer. With all the knowledge we have, it should be quite simple. Read more

Today we’ll fight with the final boss and save the princess. We’ll finally see our teapot on the screen. Read more

At this point, we have shaders, static data is uploaded to the GPU, the pipelines are set up, and we’re almost ready to start to draw. Except that we don’t have an image where we can draw. An image is just memory, and this entire step is dedicated to these special images for drawing - swapchain images. Read more

In the previous step we uploaded the data to the GPU, but we still don’t know how to use it. Today we’ll fill that gap partially. We need to tell Vulkan upfront which resources we’re going to use for a particular effect. We do it via pipelines. Read more

We have 4 shaders we created in the previous step, but these are useless until we feed GPU data. Let’s look at the picture to recall which kind of resources we need. Read more

In the previous lesson, we made all necessary preparations to start exploring Vulkan. Read more