Added support for dynamic d3dcompile load

If you really want to use d3dcompile, then I think its better to find the most recent d3dcompile you have on your computer and load its D3DCompile function.
This process is now automatically handled. Just define  the right Preprocessor.

ImGui/impls/imgui_impl_dx10.cpp

@@ -335,6 +335,12 @@ bool    ImGui_ImplDX10_CreateDeviceObjects()
     //  2) use code to detect any version of the DLL and grab a pointer to D3DCompile from the DLL.
     // See https://github.com/ocornut/imgui/pull/638 for sources and details.
 
+#ifdef USE_D3DCOMPILE
+    decltype(D3DCompile)* D3DCompile = load_d3dcompile();
+    if (D3DCompile == nullptr)
+        return false;
+#endif
+
     // Create the vertex shader
     {
 #ifdef USE_D3DCOMPILE
@@ -367,6 +373,7 @@ bool    ImGui_ImplDX10_CreateDeviceObjects()
             }";
 
         D3DCompile(vertexShader, strlen(vertexShader), NULL, NULL, NULL, "main", "vs_4_0", 0, 0, &g_pVertexShaderBlob, NULL);
+
         if (g_pVertexShaderBlob == NULL) // NB: Pass ID3D10Blob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
             return false;
 
@@ -424,6 +431,7 @@ bool    ImGui_ImplDX10_CreateDeviceObjects()
             }";
 
         D3DCompile(pixelShader, strlen(pixelShader), NULL, NULL, NULL, "main", "ps_4_0", 0, 0, &g_pPixelShaderBlob, NULL);
+
         if (g_pPixelShaderBlob == NULL)  // NB: Pass ID3D10Blob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
             return false;
         if (g_pd3dDevice->CreatePixelShader((DWORD*)g_pPixelShaderBlob->GetBufferPointer(), g_pPixelShaderBlob->GetBufferSize(), &g_pPixelShader) != S_OK)
@@ -434,6 +442,10 @@ bool    ImGui_ImplDX10_CreateDeviceObjects()
 #endif
     }
 
+#ifdef USE_D3DCOMPILE
+    unload_d3dcompile();
+#endif
+
     // Create the blending setup
     {
         D3D10_BLEND_DESC desc;

ImGui/impls/imgui_impl_dx11.cpp

@@ -342,6 +342,12 @@ bool    ImGui_ImplDX11_CreateDeviceObjects()
     //  2) use code to detect any version of the DLL and grab a pointer to D3DCompile from the DLL.
     // See https://github.com/ocornut/imgui/pull/638 for sources and details.
 
+#ifdef USE_D3DCOMPILE
+    decltype(D3DCompile)* D3DCompile = load_d3dcompile();
+    if (D3DCompile == nullptr)
+        return false;
+#endif
+
     // Create the vertex shader
     {
 #ifdef USE_D3DCOMPILE
@@ -441,6 +447,10 @@ bool    ImGui_ImplDX11_CreateDeviceObjects()
 #endif
     }
 
+#ifdef USE_D3DCOMPILE
+    unload_d3dcompile();
+#endif
+
     // Create the blending setup
     {
         D3D11_BLEND_DESC desc;

ImGui/impls/imgui_impl_dx12.cpp

@@ -468,6 +468,12 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
     psoDesc.SampleDesc.Count = 1;
     psoDesc.Flags = D3D12_PIPELINE_STATE_FLAG_NONE;
 
+#ifdef USE_D3DCOMPILE
+    decltype(D3DCompile)* D3DCompile = load_d3dcompile();
+    if (D3DCompile == nullptr)
+        return false;
+#endif
+
     // Create the vertex shader
     {
 #ifdef USE_D3DCOMPILE
@@ -546,6 +552,10 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
 #endif
     }
 
+#ifdef USE_D3DCOMPILE
+    unload_d3dcompile();
+#endif
+
     // Create the blending setup
     {
         D3D12_BLEND_DESC& desc = psoDesc.BlendState;

overlay_experimental/ImGui_ShaderBlobs.cpp

@@ -1,5 +1,36 @@
 #include "ImGui_ShaderBlobs.h"
 
+#ifdef USE_D3DCOMPILE
+
+#include <stdio.h>
+
+static HMODULE d3dcompile_dll = nullptr;
+
+decltype(D3DCompile)* load_d3dcompile()
+{
+    decltype(D3DCompile)* func = nullptr;
+    for (int i = 47; i > 30; i--)
+    {
+        char dll_name[20];
+        sprintf_s(dll_name, "d3dcompiler_%02d.dll", i);
+        if (d3dcompile_dll = LoadLibraryA(dll_name))
+        {
+            func = (decltype(D3DCompile)*)GetProcAddress(d3dcompile_dll, "D3DCompile");
+            break;
+        }
+    }
+
+    return func;
+}
+
+void unload_d3dcompile()
+{
+    if (d3dcompile_dll)
+        FreeLibrary(d3dcompile_dll);
+}
+
+#else
+
 extern unsigned char ImGui_vertexShaderDX10[] = {
   0x44, 0x58, 0x42, 0x43, 0x7a, 0x54, 0x84, 0x96, 0xdf, 0xd1, 0x9e, 0x21,
   0xfd, 0x85, 0x86, 0x3d, 0x28, 0xd1, 0x03, 0xae, 0x01, 0x00, 0x00, 0x00,
@@ -284,3 +315,5 @@ extern unsigned char ImGui_pixelShaderDX12[] = {
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00
 };
+
+#endif

overlay_experimental/ImGui_ShaderBlobs.h

@@ -6,9 +6,12 @@
 
 #ifdef USE_D3DCOMPILE
     #include <d3dcompiler.h>
-  #ifdef _MSC_VER
-    #pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
-  #endif
+  //#ifdef _MSC_VER
+  //  #pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
+  //#endif
+
+    decltype(D3DCompile)* load_d3dcompile();
+    void unload_d3dcompile();
 #else
 
 #define ImGui_vertexShaderDX10_len 876