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Buffers in Vulkan

Buffers in Vulkan

I've now got the Vulkan renderer drawing multiple different models in one single pass. This is done by merging all mesh geometry into one single vertex and indice buffer and using indirect drawing. I implemented this originally in OpenGL and was able to translate the technique over to Vulkan. This can allow an entire scene to be drawn in just one or a few draw calls. This will make a tremendous improvement in performance in complex scenes like The Zone. In that scene in Leadwerks the slow step i

Josh

Josh

First Vulkan Performance Results

Using my box test of over 100,000 boxes, I can compare performance in the new engine using OpenGL and Vulkan side by side. The results are astounding. Our new engine uses extensive multithreading to perform culling and rendering on separate threads, bringing down the time the GPU sits around waiting for the CPU to nearly zero. Hardware: Nvidia GEForce GTX 1070 (notebook) OpenGL: ~380 FPS Vulkan 700+ FPS. FRAPS does not work with Vulkan, so the only FPS counter I have is

Josh

Josh

Uniform Buffers in Vulkan

Uniform Buffers in Vulkan

Following this tutorial, I have managed to add uniform buffers into my Vulkan graphics pipeline. Since each image in the swapchain has a different graphics pipeline object, and uniform buffers are tied to a pipeline, you end up uploading all the data three times every time it changes. OpenGL might be doing something like this under the hood, but I am not sure this is a good approach. There are three ways to get data to a shader in Vulkan. Push constants are synonymous with GLSL uniforms, althoug

Josh

Josh

Command Buffer Synchronization in Vulkan

Command Buffer Synchronization in Vulkan

The Vulkan graphics API is unbelievably complex. To create a render context, you must create a series of images for the front and back buffers (you can create three for triple-buffering). This is called a swap chain. Now, Vulkan operates on the principle of command buffers, which are a list of commands that get sent to the GPU. Guess what? The target image is part of the command buffer! So for each image in your swap chain, you need to maintain a separate command buffer  If anything changes in y

Josh

Josh

Vulkan Shader Compilation

One of the best points of Vulkan is how shaders are loaded from precompiled Spir-V files. This means GLSL shaders either work or they don't. Unlike OpenGL, there is no different outcome on Intel, AMD, or nVidia hardware. SPIR-V files can be compiled using a couple of different utilities. I favor LunarG's compiler because it supports #include directives. Shader.vert: #version 450 #extension GL_ARB_separate_shader_objects : enable #include "VertexLayout.glsl" layout(push_constant) unifo

Josh

Josh

Vulkan Shader Uniforms

In Vulkan all shader uniforms are packed into a single structure declared in a GLSL shader like this: layout(push_constant) uniform pushBlock { vec4 color; } pushConstantsBlock; You can add more values, but the shaders all need to use the same structure, and it needs to be declared exactly the same inside the program. Like everything else in Vulkan, shaders are set inside a command buffer. But these shader values are likely to be constantly changing each frame, so how do you hand

Josh

Josh

Compatibility Wrapper

While we have Leadwerks today to make our apps, Turbo is currently in development. To make my projects more long term, I decided to take a step back from my VR project and create a wrapper class that apps can use to more easily transfer to the new engine.  Keep in-mind, this doesn't cover everything and I'm used the last beta from November for testing so things can change. Regardless, as long as that bridge is made, I can always go back and edit the Turbo stuff as more things come online. The go

reepblue

reepblue

Vulkan Nitty-Gritty

I am surprised at how quickly Vulkan development is coming together. The API is ridiculously verbose, but at the same time it eliminates a lot of hidden states and implicit behavior that made OpenGL difficult to work with. I have vertex buffers working now. Vertices in the new engine will always use this layout:     struct VkVertex     {         float position[3];         float normal[3];         float texcoords0[2];         float texcoords1[2];         float tangent[3];         unsigned cha

Josh

Josh

Resizable Vulkan Window

When a window in Vulkan resizes you have to manually delete the about a dozen objects and then recreate them with the new size. It's unbelievably complicated. They've pushed all the driver complexity onto the application, in an effort to simplify the job of writing drivers. I can see the advantage to this, because OpenGL drivers in the past were always inconsistent, but it is still shocking how many little details they expose in Vulkan. Just resizing a window and swapping the screen buffer invol

Josh

Josh

Hello Vulkan

Hello Vulkan

Two days and 823 lines of code later, I present to you the Vulkan triangle of awesomeness, running in our engine: Here are my thoughts on Vulkan: It's ridiculously verbose. You have to specify every little detail of the rasterizer, there's a million classes to create, and every little variable has to be exactly right. There's really no reason for this because 90% of the code is just something you copy and paste. Shaders can use GLSL, which seems very weird, but it makes thin

Josh

Josh

Getting Started with Vulkan

Getting Started with Vulkan

The latest design of my OpenGL renderer using bindless textures has some problems, and although these can be resolved, I think I have hit the limit on how useful an initial OpenGL implementation will be for the new engine. I decided it was time to dive into the Vulkan API. This is sort of scary, because I feel like it sets me back quite a lot, but at the same time the work I do with this will carry forward much better. A Vulkan-based renderer can run on Windows, Linux, Mac, iOS, Android, PS4, an

Josh

Josh

Leadwerks Game Engine 4.6 Updated

A new update for Leadwerks Game Engine 4.6 is available on the default branch. This fixes a physics bug that would cause boxes to float into the air after the player stepped on them.

Admin

Admin

Turbo Game Engine Design Document

Subscribers can now download my current revision of the Turbo Game Engine design document in the private forum here: Here are a few excerpts: The document is still evolving so expect changes and updates.

Josh

Josh

Pawn 0.0 Alpha  Release

Pawn 0.0 Alpha Release

Technical Demo File type : File.rar. Size : 15 Megas. Executable : Pawn.exe Windows Operating System. Mouse and keyboard. Control the character : W, S keys, Space and camera rotation with the mouse. Space key to jump and with the shift key run. Special key : E key, to interact with the boxes, wheel mouse click to establish if a box is kicked or transported. Notes : The player starts with 10 units of energy, which is exhausted only when running and walking, spending

Iris3D Games

Iris3D Games

Luawerks Updated

Luawerks has been updated to 1.2.8, making some small adjustments and fixes to the system. If you have previously purchased Luawerks, this update is available for free on the Leadwerks Marketplace. Following changes include: Fixed GUI code for Leadwerks Game Engine 4.6 Removed the feature "allowfullscreenfromeditor" as it was causing conflicts with fullscreen. Added ignoreeditorwinsettings bool setting to force the game to ignore editor launch settings. (Sorry f

reepblue

reepblue

Dev Log

My last NASA project is complete. There's a physics bug in Leadwerks 4.6 that will get resolved this weekend. Starting Monday I am going to focus on the new engine again and move us forward so we can release in 2020. I am really looking forward to getting back in the game.

Josh

Josh

Procedural Grass

Thought I'd show off what I've been working on this weekend.  I have implemented procedural grass as found here at Outerra.  There is still more work to be done on it but so far it looks promising.
Stacking Boxes

Stacking Boxes

The stacking of boxes has been successful, this is thanks to the system that has been implemented, kicking the box, carrying a box, and releasing a box. You could make things better, more realistic, such as when the kick and that the tip of the foot of the character to touch the box is flying, but the truth does not matter is just a simple game. At this point everything has been a challenge, and what is done at the moment is just an immersion learning process in the set of tools that L
This continues

This continues

Despite the obstacles you continue with this, a challenge of making a video game, and on the basis of this come a number of questions. Why do you do it?, What do I get from this?, the truth is nothing, nothing matters, for some reason with the passage of time, I've noticed and I think I've already said it once, this is a hobby, that if it ends in something, it would be great, but if it doesn't, everything is fine. The inconveniences at the moment, the ban of the steam account, I think it wa
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