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#include "headless_display.hpp"
#include <cstring>
#include <stdexcept>
namespace mbgl {
HeadlessDisplay::HeadlessDisplay() {
#if MBGL_USE_CGL
// TODO: test if OpenGL 4.1 with GL_ARB_ES2_compatibility is supported
// If it is, use kCGLOGLPVersion_3_2_Core and enable that extension.
CGLPixelFormatAttribute attributes[] = {
kCGLPFAOpenGLProfile,
(CGLPixelFormatAttribute) kCGLOGLPVersion_Legacy,
kCGLPFAAccelerated,
(CGLPixelFormatAttribute) 0
};
GLint num;
CGLError error = CGLChoosePixelFormat(attributes, &pixelFormat, &num);
if (error) {
fprintf(stderr, "Error pixel format: %s\n", CGLErrorString(error));
return;
}
#endif
#if MBGL_USE_GLX
if (!XInitThreads()) {
throw std::runtime_error("Failed to XInitThreads");
}
x_display = XOpenDisplay(nullptr);
if (x_display == nullptr) {
throw std::runtime_error("Failed to open X display");
}
const char *extensions = (char *)glXQueryServerString(x_display, DefaultScreen(x_display), 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");
}
static int pixelFormat[] = {
GLX_DOUBLEBUFFER, False,
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_ALPHA_SIZE, 8,
GLX_DEPTH_SIZE, 24,
GLX_STENCIL_SIZE, 8,
None
};
int configs = 0;
fb_configs = glXChooseFBConfig(x_display, DefaultScreen(x_display), pixelFormat, &configs);
if (configs <= 0) {
throw std::runtime_error("No Framebuffer configurations");
}
XSync(x_display, False);
#endif
}
HeadlessDisplay::~HeadlessDisplay() {
#if MBGL_USE_CGL
CGLDestroyPixelFormat(pixelFormat);
#endif
#if MBGL_USE_GLX
XFree(fb_configs);
XCloseDisplay(x_display);
#endif
}
}
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