91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
#include <mbgl/platform/default/headless_display.hpp>
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#if MBGL_USE_GLX
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#include <GL/glx.h>
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#endif
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#include <cstring>
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#include <stdexcept>
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#include <string>
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namespace mbgl {
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HeadlessDisplay::HeadlessDisplay() {
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#if MBGL_USE_CGL
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// TODO: test if OpenGL 4.1 with GL_ARB_ES2_compatibility is supported
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// If it is, use kCGLOGLPVersion_3_2_Core and enable that extension.
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CGLPixelFormatAttribute attributes[] = {
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kCGLPFAOpenGLProfile, static_cast<CGLPixelFormatAttribute>(kCGLOGLPVersion_Legacy),
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// Not adding kCGLPFAAccelerated, as this will make headless rendering impossible when running in VMs.
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kCGLPFAClosestPolicy,
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kCGLPFAAccumSize, static_cast<CGLPixelFormatAttribute>(32),
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kCGLPFAColorSize, static_cast<CGLPixelFormatAttribute>(24),
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kCGLPFAAlphaSize, static_cast<CGLPixelFormatAttribute>(8),
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kCGLPFADepthSize, static_cast<CGLPixelFormatAttribute>(16),
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kCGLPFAStencilSize, static_cast<CGLPixelFormatAttribute>(8),
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kCGLPFASupportsAutomaticGraphicsSwitching,
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kCGLPFAAllowOfflineRenderers, // Allows using the integrated GPU
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static_cast<CGLPixelFormatAttribute>(0)
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};
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GLint num;
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CGLError error = CGLChoosePixelFormat(attributes, &pixelFormat, &num);
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if (error != kCGLNoError) {
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throw std::runtime_error(std::string("Error choosing pixel format:") + CGLErrorString(error) + "\n");
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}
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if (num <= 0) {
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throw std::runtime_error("No pixel formats found.");
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}
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#endif
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#if MBGL_USE_GLX
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if (!XInitThreads()) {
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throw std::runtime_error("Failed to XInitThreads.");
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}
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xDisplay = XOpenDisplay(nullptr);
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if (xDisplay == nullptr) {
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throw std::runtime_error("Failed to open X display.");
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}
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const char *extensions = reinterpret_cast<const char *>(glXQueryServerString(xDisplay, DefaultScreen(xDisplay), GLX_EXTENSIONS));
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if (!extensions) {
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throw std::runtime_error("Cannot read GLX extensions.");
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}
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if (!strstr(extensions,"GLX_SGIX_fbconfig")) {
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throw std::runtime_error("Extension GLX_SGIX_fbconfig was not found.");
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}
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if (!strstr(extensions, "GLX_SGIX_pbuffer")) {
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throw std::runtime_error("Cannot find glXCreateContextAttribsARB.");
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}
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// We're creating a dummy pbuffer anyway that we're not using.
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static int pixelFormat[] = {
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GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT,
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None
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};
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int configs = 0;
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fbConfigs = glXChooseFBConfig(xDisplay, DefaultScreen(xDisplay), pixelFormat, &configs);
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if (fbConfigs == nullptr) {
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throw std::runtime_error("Failed to glXChooseFBConfig.");
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}
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if (configs <= 0) {
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throw std::runtime_error("No Framebuffer configurations.");
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}
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#endif
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}
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HeadlessDisplay::~HeadlessDisplay() {
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#if MBGL_USE_CGL
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CGLDestroyPixelFormat(pixelFormat);
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#endif
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#if MBGL_USE_GLX
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XFree(fbConfigs);
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XCloseDisplay(xDisplay);
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#endif
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}
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} // namespace mbgl
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