Vulkan: Rewrite GHOST_ContextVK #111473

Jeroen Bakker · 2023-08-24T15:42:36+02:00

Jeroen Bakker commented

2023-08-24 15:42:36 +02:00

This is a rewrite of GHOST_ContextVK to align with Metal backend as described
in #111389 - solution 3 with the adaptation that GHOST is still responsible
for presenting the swap chain image and a post callback is still needed in
case the swapchain needed to be recreated.

Technical documentation: https://developer.blender.org/docs/eevee_and_viewport/gpu/vulkan/swap_chain/

Renderpasses and framebuffers are not owned anymore by GHOST_ContextVK
VKFramebuffer doesn't contain a swap chain image.
Swapchain images can only be used as a blit destination or present source.
Not as an attachment.
GHOST_ContextVK::swapBuffers would call a callback with the image the
GPU module needs to blit the results to.
Clearing of depth/stencil attachments when no depth write state is set.
Enable VK_KHR_maintenance4 to relax the stage interface mapping.
Removes most vulkan validation warnings/errors.
Detection of frame buffer changes that needs to be applied before
performing a command requiring render pass (draw/clear attachment)

Benefits

Late retrieval of a swap chain image results in better overall performance as
Blender doesn't need to wait until the image is presented on the screen.
Easier API and clearer state (transitions)
More control over Image layouts and command buffer states. (Better alignment with
Vulkan API)

This is a rewrite of GHOST_ContextVK to align with Metal backend as described in #111389 - solution 3 with the adaptation that GHOST is still responsible for presenting the swap chain image and a post callback is still needed in case the swapchain needed to be recreated. Technical documentation: https://developer.blender.org/docs/eevee_and_viewport/gpu/vulkan/swap_chain/ * Renderpasses and framebuffers are not owned anymore by GHOST_ContextVK * VKFramebuffer doesn't contain a swap chain image. * Swapchain images can only be used as a blit destination or present source. Not as an attachment. * GHOST_ContextVK::swapBuffers would call a callback with the image the GPU module needs to blit the results to. * Clearing of depth/stencil attachments when no depth write state is set. * Enable VK_KHR_maintenance4 to relax the stage interface mapping. * Removes most vulkan validation warnings/errors. * Detection of frame buffer changes that needs to be applied before performing a command requiring render pass (draw/clear attachment) **Benefits** * Late retrieval of a swap chain image results in better overall performance as Blender doesn't need to wait until the image is presented on the screen. * Easier API and clearer state (transitions) * More control over Image layouts and command buffer states. (Better alignment with Vulkan API)

Jeroen Bakker added this to the 4.0 milestone 2023-08-24 15:42:36 +02:00

Jeroen Bakker added the

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Vulkan: Rewrite GHOST_ContextVK #111473