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
|
#include <mbgl/platform/default/headless_backend.hpp>
#include <mbgl/platform/default/headless_display.hpp>
#include <mbgl/platform/log.hpp>
// #include <cassert>
#include <GL/glx.h>
namespace mbgl {
gl::glProc HeadlessBackend::initializeExtension(const char* name) {
return glXGetProcAddress(reinterpret_cast<const GLubyte*>(name));
}
void HeadlessBackend::createContext() {
xDisplay = display->xDisplay;
fbConfigs = display->fbConfigs;
if (!glContext) {
// Try to create a legacy context
glContext = glXCreateNewContext(xDisplay, fbConfigs[0], GLX_RGBA_TYPE, None, True);
if (glContext) {
if (!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 = glXCreatePbuffer(xDisplay, fbConfigs[0], pbufferAttributes);
}
void HeadlessBackend::destroyContext() {
if (glxPbuffer) {
glXDestroyPbuffer(xDisplay, glxPbuffer);
glxPbuffer = 0;
}
glXDestroyContext(xDisplay, glContext);
}
void HeadlessBackend::activateContext() {
if (!glXMakeContextCurrent(xDisplay, glxPbuffer, glxPbuffer, glContext)) {
throw std::runtime_error("Switching OpenGL context failed.\n");
}
}
void HeadlessBackend::deactivateContext() {
if (!glXMakeContextCurrent(xDisplay, 0, 0, nullptr)) {
throw std::runtime_error("Removing OpenGL context failed.\n");
}
}
} // namespace mbgl
|
