68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
#include <mbgl/platform/default/headless_backend.hpp>
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#include <mbgl/platform/default/headless_display.hpp>
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#include <mbgl/platform/log.hpp>
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// #include <cassert>
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#include <GL/glx.h>
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namespace mbgl {
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gl::glProc HeadlessBackend::initializeExtension(const char* name) {
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return glXGetProcAddress(reinterpret_cast<const GLubyte*>(name));
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}
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void HeadlessBackend::createContext() {
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xDisplay = display->xDisplay;
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fbConfigs = display->fbConfigs;
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if (!glContext) {
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// Try to create a legacy context
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glContext = glXCreateNewContext(xDisplay, fbConfigs[0], GLX_RGBA_TYPE, None, True);
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if (glContext) {
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if (!glXIsDirect(xDisplay, glContext)) {
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Log::Error(Event::OpenGL, "failed to create direct OpenGL Legacy context");
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glXDestroyContext(xDisplay, glContext);
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glContext = nullptr;
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}
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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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// Create a dummy pbuffer. We will render to framebuffers anyway, but we need a pbuffer to
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// activate the context.
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int pbufferAttributes[] = {
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GLX_PBUFFER_WIDTH, 8,
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GLX_PBUFFER_HEIGHT, 8,
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None
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};
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glxPbuffer = glXCreatePbuffer(xDisplay, fbConfigs[0], pbufferAttributes);
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}
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void HeadlessBackend::destroyContext() {
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if (glxPbuffer) {
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glXDestroyPbuffer(xDisplay, glxPbuffer);
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glxPbuffer = 0;
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}
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glXDestroyContext(xDisplay, glContext);
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}
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void HeadlessBackend::activateContext() {
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if (!glXMakeContextCurrent(xDisplay, glxPbuffer, glxPbuffer, glContext)) {
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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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if (!glXMakeContextCurrent(xDisplay, 0, 0, nullptr)) {
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throw std::runtime_error("Removing OpenGL context failed.\n");
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}
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}
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} // namespace mbgl
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