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Enable asset load redirection #106

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Enable asset load redirection #106

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13 changes: 13 additions & 0 deletions src/hello_imgui/hello_imgui_assets.h
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,8 @@ struct AssetFileData
// You *have* to call FreeAssetFileData to free the memory, except if you use
// ImGui::GetIO().Fonts->AddFontFromMemoryTTF, which will take ownership of the
// data and free it for you.
// This function can be redirected with setLoadAssetFileDataFunction. If not redirected,
// it calls DefaultLoadAssetFileData.
AssetFileData LoadAssetFileData(const char *assetPath);

// FreeAssetFileData(AssetFileData *)
Expand All @@ -47,6 +49,17 @@ AssetFileData LoadAssetFileData(const char *assetPath);
void FreeAssetFileData(AssetFileData * assetFileData);
// @@md

// Function type to redirect asset loads. Function receives a path and
// returns an AssetFileData structure. By default, it points to
// DefaultLoadAssetFileData.
typedef AssetFileData (*LoadAssetFileDataFunc)(const char *assetPath);

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Since I have to emit Python bindings for all other code in this library, I cannot use bare C function pointers.

Instead I will need to be replaced by a std::function (which is essentially the same except that it can be bound using Python).

// Redirect asset loads to user-defined function
void setLoadAssetFileDataFunction(LoadAssetFileDataFunc func);

// This function actually performs the asset load, as described in
// LoadAssetFileData
AssetFileData DefaultLoadAssetFileData(const char *assetPath);

// @@md#assetFileFullPath

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17 changes: 15 additions & 2 deletions src/hello_imgui/internal/hello_imgui_assets.cpp
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Expand Up @@ -263,7 +263,7 @@ bool AssetExists(const std::string& assetFilename)

#ifdef HELLOIMGUI_USE_SDL2

AssetFileData LoadAssetFileData(const char *assetPath)
AssetFileData DefaultLoadAssetFileData(const char *assetPath)
{
#ifdef __ANDROID__
{
Expand Down Expand Up @@ -328,7 +328,7 @@ AssetFileData LoadAssetFileData_Impl(const char *assetPath)
}
}

AssetFileData LoadAssetFileData(const char *assetPath)
AssetFileData DefaultLoadAssetFileData(const char *assetPath)
{
std::string fullPath = assetFileFullPath(assetPath);
AssetFileData r = LoadAssetFileData_Impl(fullPath.c_str());
Expand All @@ -348,6 +348,19 @@ void FreeAssetFileData(AssetFileData * assetFileData)
assetFileData = nullptr;
}

static LoadAssetFileDataFunc loadAssetFileDataFunc = DefaultLoadAssetFileData;

AssetFileData LoadAssetFileData(const char *assetPath)
{
AssetFileData data = loadAssetFileDataFunc(assetPath);
return data;
}

void setLoadAssetFileDataFunction(LoadAssetFileDataFunc newLoadAssetFileDataFunc)
{
loadAssetFileDataFunc = newLoadAssetFileDataFunc;
}

#endif // #ifdef HELLOIMGUI_USE_SDL2


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