3D Graphics Rendering Cookbook by Sergey Kosarevsky & Viktor Latypov

Author:Sergey Kosarevsky & Viktor Latypov [Sergey Kosarevsky]
Language: eng
Format: epub, pdf
Publisher: Packt Publishing
Published: 2021-08-24T16:00:00+00:00

How to do it...

Let's start by discussing the process of writing a texture-generating GLSL compute shader. The simplest shader to generate a red-green-blue-alpha (RGBA) image without using any input data outputs an image by using the gl_GlobalInvocationID built-in variable to know which pixel to output. This maps directly to how ShaderToy shaders operate, thus we can transform them into a compute shader just by adding some input and output (I/O) parameters and layout modifiers specific to compute shaders and Vulkan. Let's take a look at a minimalistic compute shader that creates a red-green gradient texture.

As in all other compute shaders, one mandatory line at the beginning tells the driver how to distribute the workload on the GPU. In our case, we are processing tiles of 16x16 pixels:layout (local_size_x = 16, local_size_y = 16) in;

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