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Backends: Vulkan: Support for custom function/symbol loader (#3759, #3227)

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- It adds an optional feature to support dynamic linkage of Vulkan instead of using default linkage.
 - It is now possible to have several potentially working implementation and whenever the Vulkan library was available it can work.
This commit is contained in:
Hossein Noroozpour
2021-01-26 21:04:12 +03:30
committed by ocornut
parent 066406b9be
commit 6001c54598
2 changed files with 110 additions and 14 deletions
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45
backends/imgui_impl_vulkan.h
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@ -22,25 +22,44 @@
#pragma once
#include "imgui.h" // IMGUI_IMPL_API
// In order to be able to use a customized Vulkan loader instead of the default one, you can uncomment the
// underlying definition in here (not in your code) or define it as a compilation flag in your build system.
// After enabling this, the user has to provide 'GetVulkanProcAddressFn' (and 'user_data' if it was needed) in
// the 'ImGui_ImplVulkan_InitInfo' so the implementation can resolve function addresses with that.
// If you have no idea what it is, leave it alone!
//#define IMGUI_IMPL_VULKAN_NO_PROTOTYPES
#ifdef IMGUI_IMPL_VULKAN_NO_PROTOTYPES
#define VK_NO_PROTOTYPES 1
#endif
#include <vulkan/vulkan.h>
// Initialization data, for ImGui_ImplVulkan_Init()
// [Please zero-clear before use!]
struct ImGui_ImplVulkan_InitInfo
{
VkInstance Instance;
VkPhysicalDevice PhysicalDevice;
VkDevice Device;
uint32_t QueueFamily;
VkQueue Queue;
VkPipelineCache PipelineCache;
VkDescriptorPool DescriptorPool;
uint32_t Subpass;
uint32_t MinImageCount; // >= 2
uint32_t ImageCount; // >= MinImageCount
VkSampleCountFlagBits MSAASamples; // >= VK_SAMPLE_COUNT_1_BIT
const VkAllocationCallbacks* Allocator;
void (*CheckVkResultFn)(VkResult err);
VkInstance Instance;
VkPhysicalDevice PhysicalDevice;
VkDevice Device;
uint32_t QueueFamily;
VkQueue Queue;
VkPipelineCache PipelineCache;
VkDescriptorPool DescriptorPool;
uint32_t Subpass;
uint32_t MinImageCount; // >= 2
uint32_t ImageCount; // >= MinImageCount
VkSampleCountFlagBits MSAASamples; // >= VK_SAMPLE_COUNT_1_BIT
const VkAllocationCallbacks* Allocator;
void (*CheckVkResultFn)(VkResult err);
#ifdef IMGUI_IMPL_VULKAN_NO_PROTOTYPES
// This function pointer is needed when the default Vulkan loader is disabled(not applicable).
// For more information look at comments before '#define IMGUI_IMPL_VULKAN_NO_PROTOTYPES'
PFN_vkVoidFunction (*GetVulkanProcAddressFn)(void *user_data, const char* pName);
// This pointer is going to be fed to the 'GetVulkanProcAddressFn', you can use it for
// accessing contex/object that is maybe needed for the function call.
void *user_data;
#endif
};
// Called by user code