Push constants is a way to quickly provide a small amount of uniform data to shaders. It should be much quicker than UBOs but a huge limitation is the size of data – spec requires 128 bytes to be available for a push constant range. Hardware vendors may support more, but compared to other means … Read more
They have one so that the pNext field actually works. Yes, the API takes a struct with a proper C type, so both the caller and the receiver agree on what type that struct is. But especially nowadays, many such structs have linked lists of structures that provide additional information to the implementation. These extension … Read more
VkFramebuffer + VkRenderPass defines the render target. Render pass defines which attachment will be written with colors. VkFramebuffer defines which VkImageView is to be which attachment. VkImageView defines which part of VkImage to use. VkImage defines which VkDeviceMemory is used and a format of the texel. Or maybe in opposite sequence: VkDeviceMemory is just a … Read more
How does OpenCL relates to vulkan ? I understand that OpenCL is higher level and abstracts the devices, but does ( or could ) it uses Vulkan internally ? They’re not related to each other at all. Well, they do technically use the same intermediate shader language, but Vulkan forbids the Kernel execution model, and … Read more
To understand queue families, you first have to understand queues. A queue is something you submit command buffers to, and command buffers submitted to a queue are executed in order[*1] relative to each other. Command buffers submitted to different queues are unordered relative to each other unless you explicitly synchronize them with VkSemaphore. You can … Read more
NO! Never do this! When declaring UBOs/SSBOs, pretend that all 3-element vector types don’t exist. This includes column-major matrices with 3 rows or row-major matrices with 3 columns. Pretend that the only types are scalars, 2, and 4 element vectors (and matrices). You will save yourself a very great deal of grief if you do … Read more
In the most general sense, no. OpenGL and Direct3D only allow one index per vertex; the index fetches from each stream of vertex data. Therefore, every unique combination of components must have its own separate index. So if you have a cube, where each face has its own normal, you will need to replicate the … Read more