f06f60803c
Co-authored-by: acalcutt <acalcutt@techidiots.net> Co-authored-by: Bart Louwers <bart.louwers@gmail.com> Co-authored-by: Ovidiu Voda <ovi.voda@gmail.com>
54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
#include <mbgl/util/logging.hpp>
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#include <cassert>
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#include <mbgl/gl/headless_backend.hpp>
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#include <GL/osmesa.h>
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namespace mbgl {
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namespace gl {
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// This class provides a singleton that contains information about the configuration used for
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// instantiating new headless rendering contexts.
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class OSMesaBackendImpl final : public HeadlessBackend::Impl {
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public:
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OSMesaBackendImpl() {
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context = OSMesaCreateContextAttribs(std::initializer_list<int>({
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OSMESA_FORMAT, OSMESA_RGBA,
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OSMESA_DEPTH_BITS, 24,
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OSMESA_STENCIL_BITS, 8,
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OSMESA_PROFILE, OSMESA_COMPAT_PROFILE,
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NULL
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}).begin(), NULL);
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}
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~OSMesaBackendImpl() final {
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OSMesaDestroyContext(context);
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}
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gl::ProcAddress getExtensionFunctionPointer(const char* name) final {
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return (ProcAddress)::OSMesaGetProcAddress(name);
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}
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void activateContext() final {
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OSMesaMakeCurrent(context, buffer.get(), GL_UNSIGNED_BYTE, 2048, 2048);
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}
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void deactivateContext() final {
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}
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private:
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std::unique_ptr<uint8_t[]> buffer = std::make_unique<uint8_t[]>(2048 * 2048 * 4);
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OSMesaContext context = NULL;
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};
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void HeadlessBackend::createImpl() {
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assert(!impl);
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impl = std::make_unique<OSMesaBackendImpl>();
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}
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} // namespace gl
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} // namespace mbgl
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