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nanogui.cpp
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nanogui.cpp
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#include <nanogui/screen.h>
#if defined(WIN32)
#include <windows.h>
#endif
#include <nanogui/opengl.h>
#include <map>
#include <thread>
#include <chrono>
#include <iostream>
#if !defined(WIN32)
#include <locale.h>
#include <signal.h>
#include <sys/dir.h>
#endif
NANOGUI_NAMESPACE_BEGIN
static bool __mainloop_active = false;
extern std::map<GLFWwindow *, Screen *> __nanogui_screens;
void init() {
#if !defined(WIN32)
/* Avoid locale-related number parsing issues */
setlocale(LC_NUMERIC, "C");
#endif
if (!glfwInit())
throw std::runtime_error("Could not initialize GLFW!");
glfwSetErrorCallback(
[](int error, const char *desc) {
std::cerr << "GLFW error " << error << ": " << desc << std::endl;
}
);
glfwSetTime(0);
}
void mainloop() {
__mainloop_active = true;
/* If there are no mouse/keyboard events, try to refresh the
view roughly every 50 ms; this is to support animations
such as progress bards while keeping the system load
reasonably low */
std::thread refresh_thread = std::thread(
[&]() {
std::chrono::milliseconds time(50);
while (__mainloop_active) {
std::this_thread::sleep_for(time);
glfwPostEmptyEvent();
}
}
);
while (__mainloop_active) {
int numScreens = 0;
for (auto kv : __nanogui_screens) {
Screen *screen = kv.second;
if (!screen->visible()) {
continue;
} else if (glfwWindowShouldClose(screen->glfwWindow())) {
screen->setVisible(false);
continue;
}
screen->drawAll();
numScreens++;
}
if (numScreens == 0) {
/* Give up if there was nothing to draw */
__mainloop_active = false;
break;
}
/* Wait for mouse/keyboard or empty refresh events */
glfwWaitEvents();
}
refresh_thread.join();
}
void leave() {
__mainloop_active = false;
}
void shutdown() {
glfwTerminate();
}
std::array<char, 8> utf8(int c) {
std::array<char, 8> seq;
int n = 0;
if (c < 0x80) n = 1;
else if (c < 0x800) n = 2;
else if (c < 0x10000) n = 3;
else if (c < 0x200000) n = 4;
else if (c < 0x4000000) n = 5;
else if (c <= 0x7fffffff) n = 6;
seq[n] = '\0';
switch (n) {
case 6: seq[5] = 0x80 | (c & 0x3f); c = c >> 6; c |= 0x4000000;
case 5: seq[4] = 0x80 | (c & 0x3f); c = c >> 6; c |= 0x200000;
case 4: seq[3] = 0x80 | (c & 0x3f); c = c >> 6; c |= 0x10000;
case 3: seq[2] = 0x80 | (c & 0x3f); c = c >> 6; c |= 0x800;
case 2: seq[1] = 0x80 | (c & 0x3f); c = c >> 6; c |= 0xc0;
case 1: seq[0] = c;
}
return seq;
}
inline int __nanogui_get_image(NVGcontext *ctx, const std::string &name, uint8_t *data, uint32_t size) {
static std::map<std::string, int> iconCache;
auto it = iconCache.find(name);
if (it != iconCache.end())
return it->second;
int iconID = nvgCreateImageMem(ctx, 0, data, size);
if (iconID == 0)
throw std::runtime_error("Unable to load resource data.");
iconCache[name] = iconID;
return iconID;
}
std::vector<std::pair<int, std::string>>
loadImageDirectory(NVGcontext *ctx, const std::string &path) {
std::vector<std::pair<int, std::string> > result;
#if !defined(WIN32)
DIR *dp = opendir(path.c_str());
if (!dp)
throw std::runtime_error("Could not open image directory!");
struct dirent *ep;
while ((ep = readdir(dp))) {
const char *fname = ep->d_name;
#else
WIN32_FIND_DATA ffd;
std::string searchPath = path + "/*.*";
HANDLE handle = FindFirstFileA(searchPath.c_str(), &ffd);
if (handle == INVALID_HANDLE_VALUE)
throw std::runtime_error("Could not open image directory!");
do {
const char *fname = ffd.cFileName;
#endif
if (strstr(fname, "png") == nullptr)
continue;
std::string fullName = path + "/" + std::string(fname);
int img = nvgCreateImage(ctx, fullName.c_str(), 0);
if (img == 0)
throw std::runtime_error("Could not open image data!");
result.push_back(
std::make_pair(img, fullName.substr(0, fullName.length() - 4)));
#if !defined(WIN32)
}
closedir(dp);
#else
} while (FindNextFileA(handle, &ffd) != 0);
FindClose(handle);
#endif
return result;
}
#if !defined(__APPLE__)
std::string file_dialog(const std::vector<std::pair<std::string, std::string>> &filetypes, bool save) {
#define FILE_DIALOG_MAX_BUFFER 1024
#if defined(WIN32)
OPENFILENAME ofn;
ZeroMemory(&ofn, sizeof(OPENFILENAME));
ofn.lStructSize = sizeof(OPENFILENAME);
char tmp = '\0';
ofn.lpstrFile = &tmp;
ofn.nMaxFile = FILE_DIALOG_MAX_BUFFER;
ofn.nFilterIndex = 1;
std::vector<char> filter;
for (auto pair: filetypes) {
for (char c : pair.second)
filter.push_back(c);
filter.push_back('\0');
for (char c : pair.first)
filter.push_back(c);
filter.push_back('\0');
}
filter.push_back('\0');
ofn.lpstrFilter = filter.data();
if (save) {
ofn.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_OVERWRITEPROMPT;
if (GetSaveFileNameA(&ofn) == FALSE)
return "";
} else {
ofn.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
if (GetOpenFileNameA(&ofn) == FALSE)
return "";
}
return std::string(ofn.lpstrFile);
#else
char buffer[FILE_DIALOG_MAX_BUFFER];
std::string cmd = "/usr/bin/zenity --file-selection ";
if (save)
cmd += "--save ";
cmd += "--file-filter=\"";
for (auto pair: filetypes)
cmd += "\"*." + pair.first + "\" ";
cmd += "\"";
FILE *output = popen(cmd.c_str(), "r");
while (fgets(buffer, FILE_DIALOG_MAX_BUFFER, output) != NULL)
;
pclose(output);
std::string result(buffer);
result.erase(std::remove(result.begin(), result.end(), '\n'), result.end());
return result;
#endif
}
#endif
NANOGUI_NAMESPACE_END