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#pragma once
#include <map>
#include <string>
#include <string_view>
#include <unordered_map>
struct PyMOLGlobals;
class ShaderPreprocessor
{
public:
ShaderPreprocessor(PyMOLGlobals* G,
std::map<std::string, const char*>* rawShaderCache = nullptr);
/**
* Set a preprocessor variable
* @param key The preprocessor variable name
* @param value preprocessor value
*/
void setVar(std::string_view key, bool value);
/**
* Gets a preprocessor variable
* @param key The preprocessor variable name
* @return preprocessor value
*/
bool& getVar(std::string_view key);
/**
* Get the preprocessed shader source
* @param filename The shader filename
* @return The preprocessed shader source
* @note There must be a single whitespace character between the directive and
* argument.
*/
std::string getSource(std::string_view filename);
/**
* Sets the preprocessed shader source
* @param filename The shader filename
* @param source The preprocessed shader source
* @note - get() will automatically perform preprocessing. This method
* is only needed if you want to set the preprocessed shader source
*/
void setSource(std::string_view filename, std::string_view source);
/**
* Invalidate the preprocessed shader source for a given filename
* @param filename The shader filename
*/
void invalidate(std::string_view filename);
/**
* Deletes the preprocessed shader source cache
*/
void clear();
private:
PyMOLGlobals* m_G;
std::map<std::string, const char*>* m_rawShaderCache{};
std::unordered_map<std::string, bool> m_vars;
std::unordered_map<std::string, std::string> m_cache_processed;
};
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