75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
#include "headless_display.hpp"
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#include <cstring>
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#include <stdexcept>
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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,
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(CGLPixelFormatAttribute) kCGLOGLPVersion_Legacy,
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kCGLPFAAccelerated,
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(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) {
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fprintf(stderr, "Error pixel format: %s\n", CGLErrorString(error));
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return;
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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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x_display = XOpenDisplay(nullptr);
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if (x_display == 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 = (char *)glXQueryServerString(x_display, DefaultScreen(x_display), 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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fb_configs = glXChooseFBConfig(x_display, DefaultScreen(x_display), pixelFormat, &configs);
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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(fb_configs);
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XCloseDisplay(x_display);
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#endif
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}
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}
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