Struct imgui_rs_vulkan_renderer::Renderer

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pub struct Renderer { /* private fields */ }

Expand description

Vulkan renderer for imgui.

It records rendering command to the provided command buffer at each call to cmd_draw.

The renderer holds a set of vertex/index buffers per in flight frames. Vertex and index buffers are resized at each call to cmd_draw if draw data does not fit.

Implementations

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impl Renderer

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pub fn with_default_allocator(
 instance: &Instance,
 physical_device: PhysicalDevice,
 device: Device,
 queue: Queue,
 command_pool: CommandPool,
 render_pass: RenderPass,
 imgui: &mut Context,
 options: Option<Options>
) -> RendererResult<Self>

Initialize and return a new instance of the renderer.

At initialization all Vulkan resources are initialized and font texture is created and uploaded to the gpu. Vertex and index buffers are not created yet.

Arguments

instance - A reference to a Vulkan instance.
physical_device - A Vulkan physical device.
device - A Vulkan device.
queue - A Vulkan queue. It will be used to submit commands during initialization to upload data to the gpu. The type of queue must be supported by the following commands: vkCmdCopyBufferToImage, vkCmdPipelineBarrier
command_pool - A Vulkan command pool used to allocate command buffers to upload textures to the gpu.
render_pass - The render pass used to render the gui.
imgui - The imgui context.
options - Optional parameters of the renderer.

Errors

RendererError - If the number of in flight frame in incorrect.
RendererError - If any Vulkan or io error is encountered during initialization.

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pub fn set_render_pass(&mut self, render_pass: RenderPass) -> RendererResult<()>

Change the render pass to render to.

Useful if you need to render to a new render pass but don’t want to rebuild the entire renderer. It will rebuild the graphics pipeline from scratch so it is an expensive operation.

Arguments

render_pass - The render pass used to render the gui.

Errors

RendererError - If any Vulkan error is encountered during pipeline creation.

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pub fn textures(&mut self) -> &mut Textures<DescriptorSet>

Returns the texture mapping used by the renderer to lookup textures.

Textures are provided by the application as vk::DescriptorSets.

Example

let descriptor_set = ...;
// Insert a vk::DescriptorSet in the renderer textures map.
// The renderer returns a generated texture id.
let texture_id = renderer.textures().insert(descriptor_set);
...
// Create an `Image` that references the texture by its id.
Image::new(texture_id, [100, 100]).build(&ui);

Caveat

Provided vk::DescriptorSets must be created with a descriptor set layout that is compatible with the one used by the renderer. See Pipeline Layout Compatibility.

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pub fn update_fonts_texture(
 &mut self,
 queue: Queue,
 command_pool: CommandPool,
 imgui: &mut Context
) -> RendererResult<()>

Update the fonts texture after having added new fonts to imgui.

Arguments

queue - A Vulkan queue. It will be used to submit commands during initialization to upload data to the gpu. The type of queue must be supported by the following commands: vkCmdCopyBufferToImage, vkCmdPipelineBarrier
command_pool - A Vulkan command pool used to allocate command buffers to upload textures to the gpu.
imgui - The imgui context.