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#include <mbgl/gl/extension.hpp>
#include <mbgl/gl/gl.hpp>
#include <mbgl/platform/log.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;
const char* getGLString(GLenum name) {
return reinterpret_cast<const char*>(MBGL_CHECK_ERROR(glGetString(name)));
}
void InitializeExtensions(glProc (*getProcAddress)(const char*)) {
std::call_once(initializeExtensionsOnce, [getProcAddress] {
#ifndef NDEBUG
if (const char* vendor = getGLString(GL_VENDOR)) {
mbgl::Log::Info(mbgl::Event::OpenGL, "Vendor: %s", vendor);
}
if (const char* renderer = getGLString(GL_RENDERER)) {
mbgl::Log::Info(mbgl::Event::OpenGL, "Renderer: %s", renderer);
}
if (const char* version = getGLString(GL_VERSION)) {
mbgl::Log::Info(mbgl::Event::OpenGL, "Version: %s", version);
}
if (const char* shaderVersion = getGLString(GL_SHADING_LANGUAGE_VERSION)) {
mbgl::Log::Info(mbgl::Event::OpenGL, "Shading Language Version: %s", shaderVersion);
}
#endif
if (const char* extensions = getGLString(GL_EXTENSIONS)) {
#ifndef NDEBUG
mbgl::Log::Info(mbgl::Event::OpenGL, "Extensions: %s", extensions);
#endif
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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