1 files changed, 47 insertions, 0 deletions
diff --git a/platform/default/src/mbgl/gl/headless_backend_osmesa.cpp b/platform/default/src/mbgl/gl/headless_backend_osmesa.cpp
new file mode 100644
index 0000000000..0da1caf9af
--- /dev/null
+++ b/platform/default/src/mbgl/gl/headless_backend_osmesa.cpp
@@ -0,0 +1,47 @@
+#include <mbgl/gl/headless_backend.hpp>
+#include <mbgl/util/logging.hpp>
+
+#include <GL/osmesa.h>
+
+#include <cassert>
+
+namespace mbgl {
+
+class OSMesaBackendImpl : public HeadlessBackend::Impl {
+public:
+    OSMesaBackendImpl() {
+#if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
+        glContext = OSMesaCreateContextExt(OSMESA_RGBA, 16, 0, 0, nullptr);
+#else
+        glContext = OSMesaCreateContext(OSMESA_RGBA, nullptr);
+#endif
+        if (glContext == nullptr) {
+            throw std::runtime_error("Error creating GL context object.");
+        }
+    }
+
+    ~OSMesaBackendImpl() final {
+        OSMesaDestroyContext(glContext);
+    }
+
+    gl::ProcAddress getExtensionFunctionPointer(const char* name) final {
+        return OSMesaGetProcAddress(name);
+    }
+
+    void activateContext() final {
+        if (!OSMesaMakeCurrent(glContext, &fakeBuffer, GL_UNSIGNED_BYTE, 1, 1)) {
+            throw std::runtime_error("Switching OpenGL context failed.\n");
+        }
+    }
+
+private:
+    OSMesaContext glContext = nullptr;
+    GLubyte fakeBuffer = 0;
+};
+
+void HeadlessBackend::createImpl() {
+    assert(!impl);
+    impl = std::make_unique<OSMesaBackendImpl>();
+}
+
+} // namespace mbgl