48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
#include <mbgl/platform/default/headless_backend.hpp>
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#include <mbgl/platform/log.hpp>
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namespace mbgl {
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gl::glProc HeadlessBackend::initializeExtension(const char* name) {
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return OSMesaGetProcAddress(name);
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}
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void HeadlessBackend::createContext() {
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if (glContext == nullptr) {
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#if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
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glContext = OSMesaCreateContextExt(OSMESA_RGBA, 16, 0, 0, nullptr);
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#else
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glContext = OSMesaCreateContext(OSMESA_RGBA, nullptr);
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#endif
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if (glContext == nullptr) {
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Log::Error(Event::OpenGL, "failed to create OSMesa context");
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}
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}
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if (glContext == nullptr) {
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throw std::runtime_error("Error creating GL context object.");
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}
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}
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void HeadlessBackend::destroyContext() {
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if (glContext) {
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if (glContext != OSMesaGetCurrentContext()) {
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activateContext();
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}
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OSMesaDestroyContext(glContext);
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glContext = nullptr;
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}
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}
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void HeadlessBackend::activateContext() {
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if (!OSMesaMakeCurrent(glContext, &fakeBuffer, GL_UNSIGNED_BYTE, 1, 1)) {
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throw std::runtime_error("Switching OpenGL context failed.\n");
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}
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}
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void HeadlessBackend::deactivateContext() {
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// no-op.
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}
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} // namespace mbgl
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