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Backends: Vulkan: added a way to specify custom vertex/fragment shaders. (#8585, #8271)

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johan0A 2025-04-05 21:36:20 +02:00 • committed by ocornut
parent bf2e0b2c6f
commit 01686c6294
3 changed files with 23 additions and 12 deletions
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25
backends/imgui_impl_vulkan.cpp
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@ -27,6 +27,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2025-09-26: Vulkan: Added a way to customize shaders by filling ImGui_ImplVulkan_InitInfo::CustomShaderVertCreateInfo/CustomShaderFragCreateInfo. (#8585)
// 2025-09-18: Call platform_io.ClearRendererHandlers() on shutdown.
// 2025-09-04: Vulkan: Added ImGui_ImplVulkan_CreateMainPipeline(). (#8110, #8111)
// 2025-07-27: Vulkan: Fixed texture update corruption introduced on 2025-06-11. (#8801, #8755, #8840)
@ -887,24 +888,26 @@ void ImGui_ImplVulkan_UpdateTexture(ImTextureData* tex)
static void ImGui_ImplVulkan_CreateShaderModules(VkDevice device, const VkAllocationCallbacks* allocator)
{
// Create the shader modules
ImGui_ImplVulkan_Data* bd = ImGui_ImplVulkan_GetBackendData();
ImGui_ImplVulkan_InitInfo* v = &bd->VulkanInitInfo;
if (bd->ShaderModuleVert == VK_NULL_HANDLE)
{
VkShaderModuleCreateInfo vert_info = {};
vert_info.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
vert_info.codeSize = sizeof(__glsl_shader_vert_spv);
vert_info.pCode = (uint32_t*)__glsl_shader_vert_spv;
VkResult err = vkCreateShaderModule(device, &vert_info, allocator, &bd->ShaderModuleVert);
VkShaderModuleCreateInfo default_vert_info = {};
default_vert_info.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
default_vert_info.codeSize = sizeof(__glsl_shader_vert_spv);
default_vert_info.pCode = (uint32_t*)__glsl_shader_vert_spv;
VkShaderModuleCreateInfo* p_vert_info = (v->CustomShaderVertCreateInfo.sType == VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO) ? &v->CustomShaderVertCreateInfo : &default_vert_info;
VkResult err = vkCreateShaderModule(device, p_vert_info, allocator, &bd->ShaderModuleVert);
check_vk_result(err);
}
if (bd->ShaderModuleFrag == VK_NULL_HANDLE)
{
VkShaderModuleCreateInfo frag_info = {};
frag_info.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
frag_info.codeSize = sizeof(__glsl_shader_frag_spv);
frag_info.pCode = (uint32_t*)__glsl_shader_frag_spv;
VkResult err = vkCreateShaderModule(device, &frag_info, allocator, &bd->ShaderModuleFrag);
VkShaderModuleCreateInfo default_frag_info = {};
default_frag_info.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
default_frag_info.codeSize = sizeof(__glsl_shader_frag_spv);
default_frag_info.pCode = (uint32_t*)__glsl_shader_frag_spv;
VkShaderModuleCreateInfo* p_frag_info = (v->CustomShaderFragCreateInfo.sType == VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO) ? &v->CustomShaderFragCreateInfo : &default_frag_info;
VkResult err = vkCreateShaderModule(device, p_frag_info, allocator, &bd->ShaderModuleFrag);
check_vk_result(err);
}
}

8
backends/imgui_impl_vulkan.h
View file

@ -102,7 +102,13 @@ struct ImGui_ImplVulkan_InitInfo
// (Optional) Allocation, Debugging
const VkAllocationCallbacks* Allocator;
void (*CheckVkResultFn)(VkResult err);
VkDeviceSize MinAllocationSize; // Minimum allocation size. Set to 1024*1024 to satisfy zealous best practices validation layer and waste a little memory.
VkDeviceSize MinAllocationSize; // Minimum allocation size. Set to 1024*1024 to satisfy zealous best practices validation layer and waste a little memory.
// (Optional) Customize default vertex/fragment shaders.
// - if .sType == VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO we use specified structs, otherwise we use defaults.
// - Shader inputs/outputs need to match ours. Code/data pointed to by the structure needs to survive for whole during of backend usage.
VkShaderModuleCreateInfo CustomShaderVertCreateInfo;
VkShaderModuleCreateInfo CustomShaderFragCreateInfo;
};
// Follow "Getting Started" link and check examples/ folder to learn about using backends!