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