Add GL version command-line option

src/GameWindow.cpp

@@ -1,5 +1,6 @@
 #include "GameWindow.hpp"
 
+#include <cctype>
 #include <sstream>
 
 #include <al.h>
@@ -18,6 +19,7 @@
 #include "render/gl/Debug.hpp"
 #include "util/Log.hpp"
 #include "util/MemoryTracker.hpp"
+#include "util/StringUtil.hpp"
 
 namespace diggler {
 
@@ -50,10 +52,28 @@ GameWindow::GameWindow(Game *G) : G(G) {
 
   m_w = 640; m_h = 480;
 
-  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
-  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
-  glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_API /*GLFW_OPENGL_ES_API*/);
-  //glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
+  if (GlobalProperties::GfxOverrides != nullptr) {
+    for (const std::string &opt : Util::StringUtil::explode(GlobalProperties::GfxOverrides, ',')) {
+      if (opt.size() == 4 && opt[0] == 'g' && opt[1] == 'l' &&
+          isdigit(opt[2]) && isdigit(opt[3])) {
+        glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_API);
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, opt[2] - '0');
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, opt[3] - '0');
+      } else if (opt.size() == 6 && opt[0] == 'g' && opt[1] == 'l' &&
+          opt[2] == 'e' && opt[3] == 's' && isdigit(opt[4]) && isdigit(opt[5])) {
+        glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, opt[4] - '0');
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, opt[5] - '0');
+      } else if (opt == "fwd") {
+        glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
+      } else if (opt == "compat") {
+        glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_COMPAT_PROFILE);
+      } else if (opt == "core") {
+        glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+      }
+    }
+  }
+
   glfwWindowHint(GLFW_SAMPLES, 0); // Gimme aliasing everywhere
   //glfwWindowHint(GLFW_STENCIL_BITS, 8);
 

src/GlobalProperties.cpp

@@ -15,5 +15,6 @@ bool GlobalProperties::IsSoundEnabled = true;
 
 int GlobalProperties::UIScale = 2;
 
+char *GlobalProperties::GfxOverrides = nullptr;
 
 }

src/GlobalProperties.hpp

@@ -16,6 +16,8 @@ namespace GlobalProperties {
   extern bool IsSoundEnabled;
 
   extern int UIScale;
+
+  extern char *GfxOverrides;
 }
 
 }

src/main.cpp

@@ -68,7 +68,7 @@ int main(int argc, char **argv) {
 
   string host = GlobalProperties::DefaultServerHost;
   int    port = GlobalProperties::DefaultServerPort;
-  for (int i=1; i < argc; i++) {
+  for (int i=1; i < argc; ++i) {
     if (strcmp(argv[i], "-h") == 0 ||
       strcmp(argv[i], "--help") == 0) {
       showHelp(argv);
@@ -95,6 +95,8 @@ int main(int argc, char **argv) {
         GlobalProperties::PlayerName = argv[++i];
         Log(Info, TAG) << "Player's name set to " << GlobalProperties::PlayerName;
       }
+    } else if (strcmp(argv[i], "-g") == 0) {
+      GlobalProperties::GfxOverrides = argv[++i];
     } else {
       // For now, assume it's the server address
       host = argv[i];

src/util/StringUtil.cpp

@@ -6,7 +6,7 @@
 namespace diggler {
 namespace Util {
 
-std::vector<std::string> explode(const std::string &s, char delim) {
+std::vector<std::string> StringUtil::explode(const std::string &s, char delim) {
   std::vector<std::string> result;
   std::istringstream iss(s);
   for (std::string token; std::getline(iss, token, delim); ) {
@@ -15,7 +15,7 @@ std::vector<std::string> explode(const std::string &s, char delim) {
   return result;
 }
 
-std::vector<std::u32string> explode(const std::u32string &s, char32_t delim) {
+std::vector<std::u32string> StringUtil::explode(const std::u32string &s, char32_t delim) {
   std::vector<std::u32string> result;
   std::basic_istringstream<char32_t> iss(s);
   for (std::u32string token; std::getline(iss, token, delim); ) {