fossvg (client): Clean up GLFW-related code

- add some Vulkan-specific things to deal with GLFW
- get rid of useless warnings
- allow to set window size from the command line

The Window size is fixed for now because that will hopefully make
things easier in the strt. I intend to have a resizable window
in the future but getting things going is more important.

src/fossvg.cpp

@@ -21,7 +21,10 @@
 #include <cstdint>
 #include <string>
 
-#include <GLFW/glfw3.h>
+#define GLFW_INCLUDE_VULKAN
+extern "C" {
+    #include <GLFW/glfw3.h>
+}
 
 #include "./lib/cli.hpp"
 
@@ -29,24 +32,27 @@
 #define EXIT_RUNTIME 1
 #define EXIT_USAGE   2
 
+uint32_t windowWidth = 1366;
+uint32_t windowHeight = 768;
+
 //TODO: check the TODO above glfwInit() in void main()
 // #### Callbacks ##############################################################
-void cursorPositionCallback(GLFWwindow* window, double x, double y) {
+void cursorPositionCallback([[maybe_unused]] GLFWwindow* window, [[maybe_unused]] double x, [[maybe_unused]] double y) {
 }
 
-void keyCallback(GLFWwindow* window, int32_t key, int32_t scancode, int32_t action, int32_t mods) {
+void keyCallback([[maybe_unused]] GLFWwindow* window, [[maybe_unused]] int32_t key, [[maybe_unused]] int32_t scancode, [[maybe_unused]] int32_t action, [[maybe_unused]] int32_t mods) {
 }
 
-void textInputCallback(GLFWwindow* window, uint32_t codepoint) {
+void textInputCallback([[maybe_unused]] GLFWwindow* window, [[maybe_unused]] uint32_t codepoint) {
 }
 
-void cursorEnterLeaveCallback(GLFWwindow* window, int32_t entered) {
+void cursorEnterLeaveCallback([[maybe_unused]] GLFWwindow* window, [[maybe_unused]] int32_t entered) {
 }
 
-void mouseButtonCallback(GLFWwindow* window, int32_t button, int32_t action, int32_t mods) {
+void mouseButtonCallback([[maybe_unused]] GLFWwindow* window, [[maybe_unused]] int32_t button, [[maybe_unused]] int32_t action, [[maybe_unused]] int32_t mods) {
 }
 
-void scrollCallback(GLFWwindow* window, double x, double y) {
+void scrollCallback([[maybe_unused]] GLFWwindow* window, [[maybe_unused]] double x, [[maybe_unused]] double y) {
 }
 // #### End Callbacks ##########################################################
 
@@ -55,6 +61,8 @@ int main(int argc, char* argv[]) {
     flags.push_back(CLI::Flag('h', "help",    "print help and exit"));
     flags.push_back(CLI::Flag('l', "license", "print license information and exit"));
     std::vector<CLI::Option> options;
+    options.push_back(CLI::Option('x', "window-width",  "PIXELS", "window width on startup"));
+    options.push_back(CLI::Option('y', "window-height", "PIXELS", "window height on startup"));
     std::vector<CLI::Argument> arguments;
     CLI::ArgumentsParser cliParser = CLI::ArgumentsParser(argc, argv, flags, options, arguments, "FOSS-VG Client");
 
@@ -88,6 +96,14 @@ int main(int argc, char* argv[]) {
         return EXIT_USAGE;
     }
 
+    if (cliParser.getOption("window-width").errorCode != ErrorCodes::NOT_PRESENT) {
+        windowWidth = std::stoi(cliParser.getOption("window-width").value);
+    }
+
+    if (cliParser.getOption("window-height").errorCode != ErrorCodes::NOT_PRESENT) {
+        windowHeight = std::stoi(cliParser.getOption("window-height").value);
+    }
+
 
     // TODO: Find a better place for this
     // Ideally, the window management and rendering portion of FOSS-VG should
@@ -99,9 +115,11 @@ int main(int argc, char* argv[]) {
             return EXIT_RUNTIME;
         }
 
-        //TODO: allow to set startup window size using CLI options
-        uint32_t windowWidth  = 1366;
-        uint32_t windowHeight = 768;
+        // do not create OpenGL context
+        glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
+
+        glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);
+
         //TODO: add a version macro
         // (for example Git commit hash passed on the compiler command line)
         std::string windowTitle = "FOSS-VG";
@@ -124,6 +142,7 @@ int main(int argc, char* argv[]) {
             glfwPollEvents();
         }
 
+        glfwDestroyWindow(window);
         glfwTerminate();
     }