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Backends: vulkan: add possibility for custom frag and vertex shaders #8585

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Backends: vulkan: add possibility for custom frag and vertex shaders #8585

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25 changes: 21 additions & 4 deletions backends/imgui_impl_vulkan.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -852,21 +852,38 @@ static void ImGui_ImplVulkan_CreateShaderModules(VkDevice device, const VkAlloca
{
// Create the shader modules
ImGui_ImplVulkan_Data* bd = ImGui_ImplVulkan_GetBackendData();
ImGui_ImplVulkan_InitInfo* initInfo = &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;
if (initInfo->CustomVertShader)
{
vert_info.codeSize = initInfo->CustomVertShaderSize;
vert_info.pCode = initInfo->CustomVertShader;
}
else
{
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);
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;
if (initInfo->CustomFragShader)
{
frag_info.codeSize = initInfo->CustomFragShaderSize;
frag_info.pCode = initInfo->CustomFragShader;
}
else
{
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);
check_vk_result(err);
}
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6 changes: 6 additions & 0 deletions backends/imgui_impl_vulkan.h
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Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,12 @@ struct ImGui_ImplVulkan_InitInfo
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.

// (Optional) Set to overwrite default frag and vertex shaders
const uint32_t* CustomFragShader;
size_t CustomFragShaderSize; // in bytes
const uint32_t* CustomVertShader;
size_t CustomVertShaderSize; // in bytes
};

// Follow "Getting Started" link and check examples/ folder to learn about using backends!
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