1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
#include <mbgl/platform/default/headless_display.hpp>
#include <cstring>
#include <stdexcept>
#if MBGL_USE_GLX
#include <GL/glx.h>
#endif
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,
static_cast<CGLPixelFormatAttribute>(kCGLOGLPVersion_Legacy),
kCGLPFAAccelerated,
static_cast<CGLPixelFormatAttribute>(0)
};
GLint num;
CGLError error = CGLChoosePixelFormat(attributes, &pixelFormat, &num);
if (error != kCGLNoError) {
throw std::runtime_error(std::string("Error choosing pixel format:") + CGLErrorString(error) + "\n");
return;
}
if (num <= 0) {
throw std::runtime_error("No pixel formats found.");
return;
}
#endif
#if MBGL_USE_GLX
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 char *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.");
}
#endif
}
HeadlessDisplay::~HeadlessDisplay() {
#if MBGL_USE_CGL
CGLDestroyPixelFormat(pixelFormat);
#endif
#if MBGL_USE_GLX
XFree(fbConfigs);
XCloseDisplay(xDisplay);
#endif
}
}
|
