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#include <mbgl/gl/headless_display.hpp>
#include <GL/glx.h>
#include <cstring>
#include <stdexcept>
#include <string>
namespace mbgl {
class HeadlessDisplay::Impl {
public:
Impl();
~Impl();
Display* xDisplay = nullptr;
GLXFBConfig* fbConfigs = nullptr;
};
HeadlessDisplay::Impl::Impl() {
if (!XInitThreads()) {
throw std::runtime_error("Failed to XInitThreads.");
}
xDisplay = XOpenDisplay(nullptr);
if (xDisplay == nullptr) {
throw std::runtime_error("Failed to open X display.");
}
const auto *extensions = reinterpret_cast<const char *>(glXQueryServerString(xDisplay, DefaultScreen(xDisplay), GLX_EXTENSIONS));
if (!extensions) {
throw std::runtime_error("Cannot read GLX extensions.");
}
if (!strstr(extensions,"GLX_SGIX_fbconfig")) {
throw std::runtime_error("Extension GLX_SGIX_fbconfig was not found.");
}
if (!strstr(extensions, "GLX_SGIX_pbuffer")) {
throw std::runtime_error("Cannot find glXCreateContextAttribsARB.");
}
// We're creating a dummy pbuffer anyway that we're not using.
static int pixelFormat[] = {
GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT,
None
};
int configs = 0;
fbConfigs = glXChooseFBConfig(xDisplay, DefaultScreen(xDisplay), pixelFormat, &configs);
if (fbConfigs == nullptr) {
throw std::runtime_error("Failed to glXChooseFBConfig.");
}
if (configs <= 0) {
throw std::runtime_error("No Framebuffer configurations.");
}
}
HeadlessDisplay::Impl::~Impl() {
XFree(fbConfigs);
XCloseDisplay(xDisplay);
}
template <>
Display* HeadlessDisplay::attribute() const {
return impl->xDisplay;
}
template <>
GLXFBConfig* HeadlessDisplay::attribute() const {
return impl->fbConfigs;
}
HeadlessDisplay::HeadlessDisplay()
: impl(std::make_unique<Impl>()) {
}
HeadlessDisplay::~HeadlessDisplay() = default;
} // namespace mbgl
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