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[core] fold HeadlessDisplay into the headless RenderBackend implementation

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This commit is contained in:
Konstantin Käfer
2017-11-27 16:34:52 +01:00
parent 772b909062
commit 335f04f7e1
17 changed files with 288 additions and 445 deletions
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140
platform/linux/src/headless_backend_glx.cpp
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@@ -1,5 +1,4 @@
#include <mbgl/gl/headless_backend.hpp>
#include <mbgl/gl/headless_display.hpp>
#include <mbgl/util/logging.hpp>
@@ -9,79 +8,122 @@
namespace mbgl {
struct GLXImpl : public HeadlessBackend::Impl {
GLXImpl(GLXContext glContext_, GLXPbuffer glxPbuffer_, Display* xDisplay_, GLXFBConfig* fbConfigs_)
: glContext(glContext_),
glxPbuffer(glxPbuffer_),
xDisplay(xDisplay_),
fbConfigs(fbConfigs_) {
// This class provides a singleton that contains information about the configuration used for
// instantiating new headless rendering contexts.
class GLXDisplayConfig {
private:
// Key for singleton construction.
struct Key { explicit Key() = default; };
public:
GLXDisplayConfig(Key) {
if (!XInitThreads()) {
throw std::runtime_error("Failed to XInitThreads.");
}
xDisplay = XOpenDisplay(nullptr);
if (xDisplay == nullptr) {
throw std::runtime_error("Failed to open X display.");
}
const auto* extensions = reinterpret_cast<const char*>(
glXQueryServerString(xDisplay, DefaultScreen(xDisplay), GLX_EXTENSIONS));
if (!extensions) {
throw std::runtime_error("Cannot read GLX extensions.");
}
if (!strstr(extensions, "GLX_SGIX_fbconfig")) {
throw std::runtime_error("Extension GLX_SGIX_fbconfig was not found.");
}
if (!strstr(extensions, "GLX_SGIX_pbuffer")) {
throw std::runtime_error("Cannot find glXCreateContextAttribsARB.");
}
// We're creating a dummy pbuffer anyway that we're not using.
static int pixelFormat[] = { GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT, None };
int configs = 0;
fbConfigs = glXChooseFBConfig(xDisplay, DefaultScreen(xDisplay), pixelFormat, &configs);
if (fbConfigs == nullptr) {
throw std::runtime_error("Failed to glXChooseFBConfig.");
}
if (configs <= 0) {
throw std::runtime_error("No Framebuffer configurations.");
}
}
~GLXImpl() override {
if (glxPbuffer) {
glXDestroyPbuffer(xDisplay, glxPbuffer);
~GLXDisplayConfig() {
XFree(fbConfigs);
XCloseDisplay(xDisplay);
}
static std::shared_ptr<const GLXDisplayConfig> create() {
static std::weak_ptr<const GLXDisplayConfig> instance;
auto shared = instance.lock();
if (!shared) {
instance = shared = std::make_shared<GLXDisplayConfig>(Key{});
}
glXDestroyContext(xDisplay, glContext);
return shared;
}
public:
Display* xDisplay = nullptr;
GLXFBConfig* fbConfigs = nullptr;
};
struct GLXImpl : public HeadlessBackend::Impl {
GLXImpl() {
// Try to create a legacy context.
glContext = glXCreateNewContext(glxDisplay->xDisplay, glxDisplay->fbConfigs[0],
GLX_RGBA_TYPE, None, True);
if (glContext && !glXIsDirect(glxDisplay->xDisplay, glContext)) {
Log::Error(Event::OpenGL, "failed to create direct OpenGL Legacy context");
glXDestroyContext(glxDisplay->xDisplay, glContext);
glContext = nullptr;
}
if (glContext == nullptr) {
throw std::runtime_error("Error creating GL context object.");
}
// Create a dummy pbuffer. We will render to framebuffers anyway, but we need a pbuffer to
// activate the context.
int pbufferAttributes[] = { GLX_PBUFFER_WIDTH, 8, GLX_PBUFFER_HEIGHT, 8, None };
glxPbuffer =
glXCreatePbuffer(glxDisplay->xDisplay, glxDisplay->fbConfigs[0], pbufferAttributes);
}
~GLXImpl() final {
if (glxPbuffer) {
glXDestroyPbuffer(glxDisplay->xDisplay, glxPbuffer);
}
glXDestroyContext(glxDisplay->xDisplay, glContext);
}
void activateContext() final {
if (!glXMakeContextCurrent(xDisplay, glxPbuffer, glxPbuffer, glContext)) {
if (!glXMakeContextCurrent(glxDisplay->xDisplay, glxPbuffer, glxPbuffer, glContext)) {
throw std::runtime_error("Switching OpenGL context failed.\n");
}
}
void deactivateContext() final {
if (!glXMakeContextCurrent(xDisplay, 0, 0, nullptr)) {
if (!glXMakeContextCurrent(glxDisplay->xDisplay, 0, 0, nullptr)) {
throw std::runtime_error("Removing OpenGL context failed.\n");
}
}
private:
const std::shared_ptr<const GLXDisplayConfig> glxDisplay = GLXDisplayConfig::create();
GLXContext glContext = nullptr;
GLXPbuffer glxPbuffer = 0;
// Needed for ImplDeleter.
Display* xDisplay = nullptr;
GLXFBConfig* fbConfigs = nullptr;
};
gl::ProcAddress HeadlessBackend::initializeExtension(const char* name) {
return glXGetProcAddress(reinterpret_cast<const GLubyte*>(name));
}
bool HeadlessBackend::hasDisplay() {
if (!display) {
display = HeadlessDisplay::create();
}
return bool(display);
};
void HeadlessBackend::createContext() {
assert(!hasContext());
auto* xDisplay = display->attribute<Display*>();
auto* fbConfigs = display->attribute<GLXFBConfig*>();
// Try to create a legacy context.
GLXContext glContext = glXCreateNewContext(xDisplay, fbConfigs[0], GLX_RGBA_TYPE, None, True);
if (glContext && !glXIsDirect(xDisplay, glContext)) {
Log::Error(Event::OpenGL, "failed to create direct OpenGL Legacy context");
glXDestroyContext(xDisplay, glContext);
glContext = nullptr;
}
if (glContext == nullptr) {
throw std::runtime_error("Error creating GL context object.");
}
// Create a dummy pbuffer. We will render to framebuffers anyway, but we need a pbuffer to
// activate the context.
int pbufferAttributes[] = {
GLX_PBUFFER_WIDTH, 8,
GLX_PBUFFER_HEIGHT, 8,
None
};
GLXPbuffer glxPbuffer = glXCreatePbuffer(xDisplay, fbConfigs[0], pbufferAttributes);
impl = std::make_unique<mbgl::GLXImpl>(glContext, glxPbuffer, xDisplay, fbConfigs);
impl = std::make_unique<GLXImpl>();
}
} // namespace mbgl