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#include <mbgl/gl/extension.hpp>
#include <mbgl/gl/gl.hpp>
#include <mutex>
#include <string>
#include <vector>
#include <cstring>
namespace mbgl {
namespace gl {
namespace detail {
using Probes = std::vector<ExtensionFunctionBase::Probe>;
using ExtensionFunctions = std::vector<std::pair<glProc*, Probes>>;
ExtensionFunctions& extensionFunctions() {
static ExtensionFunctions functions;
return functions;
}
ExtensionFunctionBase::ExtensionFunctionBase(std::initializer_list<Probe> probes) {
extensionFunctions().emplace_back(&ptr, probes);
}
} // namespace detail
static std::once_flag initializeExtensionsOnce;
void InitializeExtensions(glProc (*getProcAddress)(const char*)) {
std::call_once(initializeExtensionsOnce, [getProcAddress] {
if (const char* extensions =
reinterpret_cast<const char*>(MBGL_CHECK_ERROR(glGetString(GL_EXTENSIONS)))) {
for (auto fn : detail::extensionFunctions()) {
for (auto probe : fn.second) {
if (strstr(extensions, probe.first) != nullptr) {
*fn.first = getProcAddress(probe.second);
break;
}
}
}
}
});
}
} // namespace gl
} // namespace mbgl
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