vulkan

package
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 Go to latest Published: Dec 24, 2025 License: MIT Imports: 9 Imported by: 0

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Overview

Package vulkan provides Pure Go Vulkan backend for the HAL.

This backend uses goffi for cross-platform Vulkan API calls, requiring no CGO. Function pointers are loaded dynamically from vulkan-1.dll (Windows), libvulkan.so.1 (Linux), or MoltenVK (macOS).

Architecture

The backend follows wgpu-hal patterns:

  • Instance: VkInstance wrapper with extension loading
  • Adapter: VkPhysicalDevice enumeration and capabilities
  • Device: VkDevice with queues and memory allocator
  • Queue: Command submission and synchronization
  • Resources: Buffers, textures, pipelines with Vulkan objects

Memory Management

Unlike OpenGL, Vulkan requires explicit memory allocation. This backend implements a pool-based memory allocator similar to gpu-allocator.

Platform Support

  • Windows: vulkan-1.dll + VK_KHR_win32_surface
  • Linux: libvulkan.so.1 + VK_KHR_xlib_surface/VK_KHR_xcb_surface (planned)
  • macOS: MoltenVK + VK_EXT_metal_surface (planned)

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Adapter 

type Adapter struct {
	// contains filtered or unexported fields
}

Adapter implements hal.Adapter for Vulkan.

func (*Adapter) Destroy 

func (a *Adapter) Destroy()

Destroy releases the adapter.

func (*Adapter) Open 

func (a *Adapter) Open(features types.Features, limits types.Limits) (hal.OpenDevice, error)

Open creates a logical device with the requested features and limits.

func (*Adapter) SurfaceCapabilities 

func (a *Adapter) SurfaceCapabilities(surface hal.Surface) *hal.SurfaceCapabilities

SurfaceCapabilities returns surface capabilities.

func (*Adapter) TextureFormatCapabilities 

func (a *Adapter) TextureFormatCapabilities(format types.TextureFormat) hal.TextureFormatCapabilities

TextureFormatCapabilities returns capabilities for a texture format.

type Backend 

type Backend struct{}

Backend implements hal.Backend for Vulkan.

func (Backend) CreateInstance 

func (Backend) CreateInstance(desc *hal.InstanceDescriptor) (hal.Instance, error)

CreateInstance creates a new Vulkan instance.

func (Backend) Variant 

func (Backend) Variant() types.Backend

Variant returns the backend type identifier.

type BindGroup 

type BindGroup struct {
	// contains filtered or unexported fields
}

BindGroup implements hal.BindGroup for Vulkan.

func (*BindGroup) Destroy 

func (g *BindGroup) Destroy()

Destroy releases the bind group.

func (*BindGroup) Handle 

func (g *BindGroup) Handle() vk.DescriptorSet

Handle returns the VkDescriptorSet handle.

type BindGroupLayout 

type BindGroupLayout struct {
	// contains filtered or unexported fields
}

BindGroupLayout implements hal.BindGroupLayout for Vulkan.

func (*BindGroupLayout) Counts 

func (l *BindGroupLayout) Counts() DescriptorCounts

Counts returns the descriptor counts for this layout.

func (*BindGroupLayout) Destroy 

func (l *BindGroupLayout) Destroy()

Destroy releases the bind group layout.

func (*BindGroupLayout) Handle 

func (l *BindGroupLayout) Handle() vk.DescriptorSetLayout

Handle returns the VkDescriptorSetLayout handle.

type Buffer 

type Buffer struct {
	// contains filtered or unexported fields
}

Buffer implements hal.Buffer for Vulkan.

func (*Buffer) Destroy 

func (b *Buffer) Destroy()

Destroy releases the buffer.

func (*Buffer) Handle 

func (b *Buffer) Handle() vk.Buffer

Handle returns the VkBuffer handle.

func (*Buffer) Size 

func (b *Buffer) Size() uint64

Size returns the buffer size in bytes.

type CommandBuffer 

type CommandBuffer struct {
	// contains filtered or unexported fields
}

CommandBuffer holds a recorded Vulkan command buffer.

func (*CommandBuffer) Destroy 

func (c *CommandBuffer) Destroy()

Destroy releases the command buffer resources.

type CommandEncoder 

type CommandEncoder struct {
	// contains filtered or unexported fields
}

CommandEncoder implements hal.CommandEncoder for Vulkan.

func (*CommandEncoder) BeginComputePass 

func (e *CommandEncoder) BeginComputePass(desc *hal.ComputePassDescriptor) hal.ComputePassEncoder

BeginComputePass begins a compute pass.

func (*CommandEncoder) BeginEncoding 

func (e *CommandEncoder) BeginEncoding(label string) error

BeginEncoding begins command recording.

func (*CommandEncoder) BeginRenderPass 

func (e *CommandEncoder) BeginRenderPass(desc *hal.RenderPassDescriptor) hal.RenderPassEncoder

BeginRenderPass begins a render pass using dynamic rendering (Vulkan 1.3+).

func (*CommandEncoder) ClearBuffer 

func (e *CommandEncoder) ClearBuffer(buffer hal.Buffer, offset, size uint64)

ClearBuffer clears a buffer region to zero.

func (*CommandEncoder) CopyBufferToBuffer 

func (e *CommandEncoder) CopyBufferToBuffer(src, dst hal.Buffer, regions []hal.BufferCopy)

CopyBufferToBuffer copies data between buffers.

func (*CommandEncoder) CopyBufferToTexture 

func (e *CommandEncoder) CopyBufferToTexture(src hal.Buffer, dst hal.Texture, regions []hal.BufferTextureCopy)

CopyBufferToTexture copies data from a buffer to a texture.

func (*CommandEncoder) CopyTextureToBuffer 

func (e *CommandEncoder) CopyTextureToBuffer(src hal.Texture, dst hal.Buffer, regions []hal.BufferTextureCopy)

CopyTextureToBuffer copies data from a texture to a buffer.

func (*CommandEncoder) CopyTextureToTexture 

func (e *CommandEncoder) CopyTextureToTexture(src, dst hal.Texture, regions []hal.TextureCopy)

CopyTextureToTexture copies data between textures.

func (*CommandEncoder) DiscardEncoding 

func (e *CommandEncoder) DiscardEncoding()

DiscardEncoding discards the encoder.

func (*CommandEncoder) EndEncoding 

func (e *CommandEncoder) EndEncoding() (hal.CommandBuffer, error)

EndEncoding finishes command recording and returns a command buffer.

func (*CommandEncoder) ResetAll 

func (e *CommandEncoder) ResetAll(commandBuffers []hal.CommandBuffer)

ResetAll resets command buffers for reuse.

func (*CommandEncoder) TransitionBuffers 

func (e *CommandEncoder) TransitionBuffers(barriers []hal.BufferBarrier)

TransitionBuffers transitions buffer states for synchronization.

func (*CommandEncoder) TransitionTextures 

func (e *CommandEncoder) TransitionTextures(barriers []hal.TextureBarrier)

TransitionTextures transitions texture states for synchronization.

type CommandPool 

type CommandPool struct {
	// contains filtered or unexported fields
}

CommandPool manages command buffer allocation.

type ComputePassEncoder 

type ComputePassEncoder struct {
	// contains filtered or unexported fields
}

ComputePassEncoder implements hal.ComputePassEncoder for Vulkan.

func (*ComputePassEncoder) Dispatch 

func (e *ComputePassEncoder) Dispatch(x, y, z uint32)

Dispatch dispatches compute work.

func (*ComputePassEncoder) DispatchIndirect 

func (e *ComputePassEncoder) DispatchIndirect(buffer hal.Buffer, offset uint64)

DispatchIndirect dispatches compute work with GPU-generated parameters.

func (*ComputePassEncoder) End 

func (e *ComputePassEncoder) End()

End finishes the compute pass.

func (*ComputePassEncoder) SetBindGroup 

func (e *ComputePassEncoder) SetBindGroup(index uint32, group hal.BindGroup, offsets []uint32)

SetBindGroup sets a bind group.

func (*ComputePassEncoder) SetPipeline 

func (e *ComputePassEncoder) SetPipeline(pipeline hal.ComputePipeline)

SetPipeline sets the compute pipeline.

type ComputePipeline 

type ComputePipeline struct {
	// contains filtered or unexported fields
}

ComputePipeline implements hal.ComputePipeline for Vulkan.

func (*ComputePipeline) Destroy 

func (p *ComputePipeline) Destroy()

Destroy releases the compute pipeline.

type DescriptorAllocator 

type DescriptorAllocator struct {
	// contains filtered or unexported fields
}

DescriptorAllocator manages descriptor pool allocation.

Thread-safe. Uses on-demand pool growth strategy with FREE_DESCRIPTOR_SET flag for individual descriptor set freeing. Follows wgpu patterns adapted for Go.

func NewDescriptorAllocator 

func NewDescriptorAllocator(device vk.Device, cmds *vk.Commands, config DescriptorAllocatorConfig) *DescriptorAllocator

NewDescriptorAllocator creates a new descriptor allocator.

func (*DescriptorAllocator) Allocate 

func (a *DescriptorAllocator) Allocate(layout vk.DescriptorSetLayout, counts DescriptorCounts) (vk.DescriptorSet, *DescriptorPool, error)

Allocate allocates a descriptor set from the given layout.

func (*DescriptorAllocator) Destroy 

func (a *DescriptorAllocator) Destroy()

Destroy releases all descriptor pools.

func (*DescriptorAllocator) Free 

func (a *DescriptorAllocator) Free(pool *DescriptorPool, set vk.DescriptorSet) error

Free frees a descriptor set back to its pool.

func (*DescriptorAllocator) Stats 

func (a *DescriptorAllocator) Stats() (pools int, allocated, freed uint32)

Stats returns allocator statistics.

type DescriptorAllocatorConfig 

type DescriptorAllocatorConfig struct {
	// InitialPoolSize is the number of sets in the first pool.
	// Default: 64
	InitialPoolSize uint32

	// MaxPoolSize is the maximum sets per pool.
	// Default: 4096
	MaxPoolSize uint32

	// GrowthFactor is the multiplier for each new pool size.
	// Default: 2
	GrowthFactor uint32
}

DescriptorAllocatorConfig configures the descriptor allocator.

func DefaultDescriptorAllocatorConfig 

func DefaultDescriptorAllocatorConfig() DescriptorAllocatorConfig

DefaultDescriptorAllocatorConfig returns sensible defaults.

type DescriptorCounts 

type DescriptorCounts struct {
	Samplers           uint32
	SampledImages      uint32
	StorageImages      uint32
	UniformBuffers     uint32
	StorageBuffers     uint32
	UniformTexelBuffer uint32
	StorageTexelBuffer uint32
	InputAttachments   uint32
}

DescriptorCounts tracks the number of descriptors by type. Used to determine pool sizes for allocation.

func (DescriptorCounts) IsEmpty 

func (c DescriptorCounts) IsEmpty() bool

IsEmpty returns true if no descriptors are needed.

func (DescriptorCounts) Multiply 

func (c DescriptorCounts) Multiply(factor uint32) DescriptorCounts

Multiply multiplies all counts by a factor.

func (DescriptorCounts) Total 

func (c DescriptorCounts) Total() uint32

Total returns the total number of descriptors.

type DescriptorPool 

type DescriptorPool struct {
	// contains filtered or unexported fields
}

DescriptorPool wraps a VkDescriptorPool with tracking.

type Device 

type Device struct {
	// contains filtered or unexported fields
}

Device implements hal.Device for Vulkan.

func (*Device) CreateBindGroup 

func (d *Device) CreateBindGroup(desc *hal.BindGroupDescriptor) (hal.BindGroup, error)

CreateBindGroup creates a bind group.

func (*Device) CreateBindGroupLayout 

func (d *Device) CreateBindGroupLayout(desc *hal.BindGroupLayoutDescriptor) (hal.BindGroupLayout, error)

CreateBindGroupLayout creates a bind group layout.

func (*Device) CreateBuffer 

func (d *Device) CreateBuffer(desc *hal.BufferDescriptor) (hal.Buffer, error)

CreateBuffer creates a GPU buffer.

func (*Device) CreateCommandEncoder 

func (d *Device) CreateCommandEncoder(desc *hal.CommandEncoderDescriptor) (hal.CommandEncoder, error)

CreateCommandEncoder creates a command encoder.

func (*Device) CreateComputePipeline 

func (d *Device) CreateComputePipeline(desc *hal.ComputePipelineDescriptor) (hal.ComputePipeline, error)

CreateComputePipeline creates a compute pipeline.

func (*Device) CreateFence 

func (d *Device) CreateFence() (hal.Fence, error)

CreateFence creates a synchronization fence.

func (*Device) CreatePipelineLayout 

func (d *Device) CreatePipelineLayout(desc *hal.PipelineLayoutDescriptor) (hal.PipelineLayout, error)

CreatePipelineLayout creates a pipeline layout.

func (*Device) CreateRenderPipeline 

func (d *Device) CreateRenderPipeline(desc *hal.RenderPipelineDescriptor) (hal.RenderPipeline, error)

CreateRenderPipeline creates a render pipeline.

func (*Device) CreateSampler 

func (d *Device) CreateSampler(desc *hal.SamplerDescriptor) (hal.Sampler, error)

CreateSampler creates a texture sampler.

func (*Device) CreateShaderModule 

func (d *Device) CreateShaderModule(desc *hal.ShaderModuleDescriptor) (hal.ShaderModule, error)

CreateShaderModule creates a shader module.

func (*Device) CreateTexture 

func (d *Device) CreateTexture(desc *hal.TextureDescriptor) (hal.Texture, error)

CreateTexture creates a GPU texture.

func (*Device) CreateTextureView 

func (d *Device) CreateTextureView(texture hal.Texture, desc *hal.TextureViewDescriptor) (hal.TextureView, error)

CreateTextureView creates a view into a texture.

func (*Device) Destroy 

func (d *Device) Destroy()

Destroy releases the device.

func (*Device) DestroyBindGroup 

func (d *Device) DestroyBindGroup(group hal.BindGroup)

DestroyBindGroup destroys a bind group.

func (*Device) DestroyBindGroupLayout 

func (d *Device) DestroyBindGroupLayout(layout hal.BindGroupLayout)

DestroyBindGroupLayout destroys a bind group layout.

func (*Device) DestroyBuffer 

func (d *Device) DestroyBuffer(buffer hal.Buffer)

DestroyBuffer destroys a GPU buffer.

func (*Device) DestroyComputePipeline 

func (d *Device) DestroyComputePipeline(pipeline hal.ComputePipeline)

DestroyComputePipeline destroys a compute pipeline.

func (*Device) DestroyFence 

func (d *Device) DestroyFence(fence hal.Fence)

DestroyFence destroys a fence.

func (*Device) DestroyPipelineLayout 

func (d *Device) DestroyPipelineLayout(layout hal.PipelineLayout)

DestroyPipelineLayout destroys a pipeline layout.

func (*Device) DestroyRenderPipeline 

func (d *Device) DestroyRenderPipeline(pipeline hal.RenderPipeline)

DestroyRenderPipeline destroys a render pipeline.

func (*Device) DestroySampler 

func (d *Device) DestroySampler(sampler hal.Sampler)

DestroySampler destroys a sampler.

func (*Device) DestroyShaderModule 

func (d *Device) DestroyShaderModule(module hal.ShaderModule)

DestroyShaderModule destroys a shader module.

func (*Device) DestroyTexture 

func (d *Device) DestroyTexture(texture hal.Texture)

DestroyTexture destroys a GPU texture.

func (*Device) DestroyTextureView 

func (d *Device) DestroyTextureView(view hal.TextureView)

DestroyTextureView destroys a texture view.

func (*Device) Wait 

func (d *Device) Wait(fence hal.Fence, _ uint64, timeout time.Duration) (bool, error)

Wait waits for a fence to reach the specified value. Note: Standard Vulkan fences don't support timeline values, so value is ignored. For timeline semantics, use VK_KHR_timeline_semaphore extension.

type Extent3D 

type Extent3D struct {
	Width  uint32
	Height uint32
	Depth  uint32
}

Extent3D represents 3D dimensions.

type Fence 

type Fence struct {
	// contains filtered or unexported fields
}

Fence implements hal.Fence for Vulkan.

func (*Fence) Destroy 

func (f *Fence) Destroy()

Destroy releases the fence.

func (*Fence) Handle 

func (f *Fence) Handle() vk.Fence

Handle returns the VkFence handle.

type Instance 

type Instance struct {
	// contains filtered or unexported fields
}

Instance implements hal.Instance for Vulkan.

func (*Instance) CreateSurface 

func (i *Instance) CreateSurface(display, window uintptr) (hal.Surface, error)

CreateSurface creates an X11 surface from display and window handles. Parameters:

  • display: X11 Display pointer (Display*)
  • window: X11 Window handle (Window)

func (*Instance) Destroy 

func (i *Instance) Destroy()

Destroy releases the Vulkan instance.

func (*Instance) EnumerateAdapters 

func (i *Instance) EnumerateAdapters(surfaceHint hal.Surface) []hal.ExposedAdapter

EnumerateAdapters returns available Vulkan adapters (physical devices).

type PipelineLayout 

type PipelineLayout struct {
	// contains filtered or unexported fields
}

PipelineLayout implements hal.PipelineLayout for Vulkan.

func (*PipelineLayout) Destroy 

func (l *PipelineLayout) Destroy()

Destroy releases the pipeline layout.

func (*PipelineLayout) Handle 

func (l *PipelineLayout) Handle() vk.PipelineLayout

Handle returns the VkPipelineLayout handle.

type Queue 

type Queue struct {
	// contains filtered or unexported fields
}

Queue implements hal.Queue for Vulkan.

func (*Queue) GetTimestampPeriod 

func (q *Queue) GetTimestampPeriod() float32

GetTimestampPeriod returns the timestamp period in nanoseconds.

func (*Queue) Present 

func (q *Queue) Present(surface hal.Surface, texture hal.SurfaceTexture) error

Present presents a surface texture to the screen.

func (*Queue) Submit 

func (q *Queue) Submit(commandBuffers []hal.CommandBuffer, fence hal.Fence, fenceValue uint64) error

Submit submits command buffers to the GPU.

func (*Queue) SubmitForPresent 

func (q *Queue) SubmitForPresent(commandBuffers []hal.CommandBuffer, swapchain *Swapchain) error

SubmitForPresent submits command buffers with swapchain synchronization.

func (*Queue) WriteBuffer 

func (q *Queue) WriteBuffer(buffer hal.Buffer, offset uint64, data []byte)

WriteBuffer writes data to a buffer immediately.

func (*Queue) WriteTexture 

func (q *Queue) WriteTexture(dst *hal.ImageCopyTexture, data []byte, layout *hal.ImageDataLayout, size *hal.Extent3D)

WriteTexture writes data to a texture immediately.

type RenderPassEncoder 

type RenderPassEncoder struct {
	// contains filtered or unexported fields
}

RenderPassEncoder implements hal.RenderPassEncoder for Vulkan.

func (*RenderPassEncoder) Draw 

func (e *RenderPassEncoder) Draw(vertexCount, instanceCount, firstVertex, firstInstance uint32)

Draw draws primitives.

func (*RenderPassEncoder) DrawIndexed 

func (e *RenderPassEncoder) DrawIndexed(indexCount, instanceCount, firstIndex uint32, baseVertex int32, firstInstance uint32)

DrawIndexed draws indexed primitives.

func (*RenderPassEncoder) DrawIndexedIndirect 

func (e *RenderPassEncoder) DrawIndexedIndirect(buffer hal.Buffer, offset uint64)

DrawIndexedIndirect draws indexed primitives with GPU-generated parameters.

func (*RenderPassEncoder) DrawIndirect 

func (e *RenderPassEncoder) DrawIndirect(buffer hal.Buffer, offset uint64)

DrawIndirect draws primitives with GPU-generated parameters.

func (*RenderPassEncoder) End 

func (e *RenderPassEncoder) End()

End finishes the render pass.

func (*RenderPassEncoder) ExecuteBundle 

func (e *RenderPassEncoder) ExecuteBundle(bundle hal.RenderBundle)

ExecuteBundle executes a pre-recorded render bundle.

func (*RenderPassEncoder) SetBindGroup 

func (e *RenderPassEncoder) SetBindGroup(index uint32, group hal.BindGroup, offsets []uint32)

SetBindGroup sets a bind group.

func (*RenderPassEncoder) SetBlendConstant 

func (e *RenderPassEncoder) SetBlendConstant(color *types.Color)

SetBlendConstant sets the blend constant.

func (*RenderPassEncoder) SetIndexBuffer 

func (e *RenderPassEncoder) SetIndexBuffer(buffer hal.Buffer, format types.IndexFormat, offset uint64)

SetIndexBuffer sets the index buffer.

func (*RenderPassEncoder) SetPipeline 

func (e *RenderPassEncoder) SetPipeline(pipeline hal.RenderPipeline)

SetPipeline sets the render pipeline.

func (*RenderPassEncoder) SetScissorRect 

func (e *RenderPassEncoder) SetScissorRect(x, y, width, height uint32)

SetScissorRect sets the scissor rectangle.

func (*RenderPassEncoder) SetStencilReference 

func (e *RenderPassEncoder) SetStencilReference(ref uint32)

SetStencilReference sets the stencil reference value.

func (*RenderPassEncoder) SetVertexBuffer 

func (e *RenderPassEncoder) SetVertexBuffer(slot uint32, buffer hal.Buffer, offset uint64)

SetVertexBuffer sets a vertex buffer.

func (*RenderPassEncoder) SetViewport 

func (e *RenderPassEncoder) SetViewport(x, y, width, height, minDepth, maxDepth float32)

SetViewport sets the viewport.

type RenderPipeline 

type RenderPipeline struct {
	// contains filtered or unexported fields
}

RenderPipeline implements hal.RenderPipeline for Vulkan.

func (*RenderPipeline) Destroy 

func (p *RenderPipeline) Destroy()

Destroy releases the render pipeline.

type Sampler 

type Sampler struct {
	// contains filtered or unexported fields
}

Sampler implements hal.Sampler for Vulkan.

func (*Sampler) Destroy 

func (s *Sampler) Destroy()

Destroy releases the sampler.

func (*Sampler) Handle 

func (s *Sampler) Handle() vk.Sampler

Handle returns the VkSampler handle.

type ShaderModule 

type ShaderModule struct {
	// contains filtered or unexported fields
}

ShaderModule implements hal.ShaderModule for Vulkan.

func (*ShaderModule) Destroy 

func (m *ShaderModule) Destroy()

Destroy releases the shader module.

func (*ShaderModule) Handle 

func (m *ShaderModule) Handle() vk.ShaderModule

Handle returns the VkShaderModule handle.

type Surface 

type Surface struct {
	// contains filtered or unexported fields
}

Surface implements hal.Surface for Vulkan.

func (*Surface) AcquireTexture 

func (s *Surface) AcquireTexture(_ hal.Fence) (*hal.AcquiredSurfaceTexture, error)

AcquireTexture acquires the next surface texture for rendering.

func (*Surface) Configure 

func (s *Surface) Configure(device hal.Device, config *hal.SurfaceConfiguration) error

Configure configures the surface for presentation.

func (*Surface) Destroy 

func (s *Surface) Destroy()

Destroy releases the surface.

func (*Surface) DiscardTexture 

func (s *Surface) DiscardTexture(_ hal.SurfaceTexture)

DiscardTexture discards a surface texture without presenting it.

func (*Surface) Unconfigure 

func (s *Surface) Unconfigure(_ hal.Device)

Unconfigure removes surface configuration.

type Swapchain 

type Swapchain struct {
	// contains filtered or unexported fields
}

Swapchain manages Vulkan swapchain for a surface.

func (*Swapchain) Destroy 

func (sc *Swapchain) Destroy()

Destroy destroys the swapchain completely.

type SwapchainTexture 

type SwapchainTexture struct {
	// contains filtered or unexported fields
}

SwapchainTexture wraps a swapchain image as a SurfaceTexture.

func (*SwapchainTexture) Destroy 

func (t *SwapchainTexture) Destroy()

Destroy implements hal.Texture.

type Texture 

type Texture struct {
	// contains filtered or unexported fields
}

Texture implements hal.Texture for Vulkan.

func (*Texture) Destroy 

func (t *Texture) Destroy()

Destroy releases the texture.

func (*Texture) Handle 

func (t *Texture) Handle() vk.Image

Handle returns the VkImage handle.

type TextureView 

type TextureView struct {
	// contains filtered or unexported fields
}

TextureView implements hal.TextureView for Vulkan.

func (*TextureView) Destroy 

func (v *TextureView) Destroy()

Destroy releases the texture view.

func (*TextureView) Handle 

func (v *TextureView) Handle() vk.ImageView

Handle returns the VkImageView handle.

Source Files

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Directories

Path Synopsis
Package memory provides GPU memory allocation for Vulkan backend.
 Package memory provides GPU memory allocation for Vulkan backend.

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