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#pragma once
#include "GL/GLShaderProgram.h"
#include <Containers/String.h>
#include <Containers/StringView.h>
using namespace Death::Containers;
#if defined(DEATH_TARGET_WINDOWS) && defined(DEATH_TARGET_X86) && defined(DEATH_TARGET_32BIT)
# define __GLAPIENTRY __stdcall
#else
# define __GLAPIENTRY
#endif
namespace nCine
{
/// Manages the cache of binary OpenGL shader programs
class BinaryShaderCache
{
public:
BinaryShaderCache(StringView path);
BinaryShaderCache(const BinaryShaderCache&) = delete;
BinaryShaderCache& operator=(const BinaryShaderCache&) = delete;
inline bool IsAvailable() const {
return isAvailable_;
}
inline std::uint64_t GetPlatformHash() const {
return platformHash_;
}
String GetCachedShaderPath(const char* shaderName);
bool LoadFromCache(const char* shaderName, std::uint64_t shaderVersion, GLShaderProgram* program, GLShaderProgram::Introspection introspection);
bool SaveToCache(const char* shaderName, std::uint64_t shaderVersion, GLShaderProgram* program);
/// Deletes all binary shaders that not belong to this platform from the cache directory
std::uint32_t Prune();
/// Deletes all binary shaders from the cache directory
bool Clear();
/// Returns the current cache directory for binary shaders
inline const StringView Path() {
return path_;
}
/// Sets a new directory as the cache for binary shaders
bool SetPath(StringView path);
private:
using glGetProgramBinary_t = void(__GLAPIENTRY*)(GLuint program, GLsizei bufSize, GLsizei* length, GLenum* binaryFormat, void* binary);
using glProgramBinary_t = void(__GLAPIENTRY*)(GLuint program, GLenum binaryFormat, const void* binary, GLsizei length);
/// A flag that indicates if the OpenGL context supports binary shaders and the cache is available
bool isAvailable_;
/// The hash value that identifies a specific OpenGL platform
std::uint64_t platformHash_;
/// The cache directory containing the binary shaders
String path_;
glGetProgramBinary_t _glGetProgramBinary;
glProgramBinary_t _glProgramBinary;
GLenum _glProgramBinaryLength;
};
}
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