Make windows close-able with the window buttons

A window can now be closed by  clicking on the X in the title bar. The
input  controller is  already running  in its own  thread, calling the
handler-functions given to it on an event's arrival.

modules/core/inc-c/voxula/internals/core.h

@@ -7,12 +7,16 @@
 #include <stdio.h>
 
 #include <voxula/internals/utility.h>
+#include <voxula/internals/window.h>
 
 typedef struct vx_core vx_core_s;
 
 struct vx_core
 {
     vx_uuid_table_s *uuid_table;
+    vx_input_controller_s *input_controller;
+    vx_window_s *main_window;
+    bool running;
 };
 
 #endif // VOXULA_CORE_H

modules/core/src-c/main.c

@@ -1,7 +1,47 @@
 #include <voxula/internals/core.h>
 
+void vx_handle_window_close(vx_window_s *window, vx_window_event_s event)
+{
+    if(event.type == VX_WINDOW_EVENT_CLOSE)
+    {
+        vx_core_s *core = window->userdata;
+        core->input_controller->running = false;
+        vx_win_hide(core->main_window);
+        return;
+    }
+    if(event.type == VX_WINDOW_EVENT_QUIT)
+    {
+        vx_core_s *core = window->userdata;;
+        core->input_controller->running = false;
+        core->running = false;
+    }
+}
+
 int main(int argc, char **argv)
 {
-    puts("The build-system is working!");
-    return -1;
+    if(argc > 1)
+    {
+        if( ! strcmp(argv[1], "--help"))
+        {
+            puts("The Voxula voxel-game engine.");
+            return 0;
+        }
+    }
+    vx_core_s core;
+    core.uuid_table = vx_new_uuid_table();
+    core.input_controller = vx_new_input_controller();
+    core.main_window = vx_new_window(core.input_controller);
+    core.main_window->fn_handle_input = vx_handle_window_close;
+    core.main_window->userdata = &core;
+    core.running = true;
+    vx_start_input_controller(core.input_controller);
+    while(core.running)
+    {
+        vx_win_show(core.main_window);
+        vx_win_present(core.main_window);
+        SDL_Delay(1000 / 30);
+    }
+    vx_free_window(core.main_window);
+
+    return 0;
 }

modules/window/inc-c/voxula/internals/window.h

@@ -0,0 +1,122 @@
+
+#ifndef VOXULA_WINDOW_H
+#define VOXULA_WINDOW_H
+
+#include <stdint.h>
+#include <threads.h>
+
+#include <SDL2/SDL.h>
+#include <voxula/internals/utility.h>
+
+typedef struct vx_input_controller vx_input_controller_s;
+typedef struct vx_window vx_window_s;
+typedef struct vx_window_event vx_window_event_s;
+
+typedef enum
+{
+    VX_WINDOW_EVENT_INVALID = 0,
+
+    VX_WINDOW_EVENT_KEY_PRESS,
+    VX_WINDOW_EVENT_KEY_RELEASE,
+
+    VX_WINDOW_EVENT_MOUSE_PRESS,
+    VX_WINDOW_EVENT_MOUSE_RELEASE,
+    VX_WINDOW_EVENT_MOUSE_MOVE,
+    VX_WINDOW_EVENT_MOUSE_SCROLL,
+
+    VX_WINDOW_EVENT_CLOSE = 254,
+    VX_WINDOW_EVENT_QUIT = 255
+
+} vx_window_event_e;
+
+typedef enum
+{
+    VX_KEY_MODIFIER_NONE = 0,
+
+    VX_KEY_MODIFIER_LEFT_CONTROL = 1,
+    VX_KEY_MODIFIER_RIGHT_CONTROL = 1 << 1,
+    VX_KEY_MODIFIER_CONTROL = 1 | (1 << 1),
+
+    VX_KEY_MODIFIER_LEFT_SHIFT = 1 << 2,
+    VX_KEY_MODIFIER_RIGHT_SHIFT = 1 << 3,
+    VX_KEY_MODIFIER_SHIFT = (1 << 2) | (1 << 3)
+
+} vx_key_modifier_e;
+
+struct vx_window_event
+{
+    vx_window_event_e type;
+    vx_window_s *association;
+
+    union vx_window_event_union
+    {
+        struct vx_key_press
+        {
+            uint16_t modifiers;
+            uint32_t character;
+        } key_press;
+
+        struct vx_key_release
+        {
+            uint16_t modifiers;
+            uint32_t character;
+        } key_release;
+
+        struct vx_mouse_press
+        {
+            vx_vec2f_s position_change;
+        } mouse_press;
+
+        struct vx_mouse_release
+        {
+            vx_vec2f_s position;
+        } mouse_release;
+
+        struct vx_mouse_move
+        {
+            vx_vec2f_s position;
+        } mouse_move;
+
+        struct vx_mouse_scroll
+        {
+            float amount;
+        } mouse_scroll;
+    } specifics;
+};
+
+struct vx_window
+{
+    vx_input_controller_s *controller;
+    SDL_Window *window;
+    SDL_GLContext gl_context;
+    void (*fn_handle_input)(vx_window_s *window, vx_window_event_s event);
+    void *userdata;
+};
+
+struct vx_input_controller
+{
+    uint32_t window_list_capacity;
+    uint32_t num_windows;
+    vx_window_s **windows;
+
+    bool running;
+    thrd_t thread;
+};
+
+vx_input_controller_s * vx_new_input_controller();
+void vx_free_input_controller(vx_input_controller_s *controller);
+
+void vx_start_input_controller(vx_input_controller_s *controller);
+void vx_stop_input_controller(vx_input_controller_s *controller);
+
+vx_window_s * vx_new_window(vx_input_controller_s *controller);
+void vx_free_window(vx_window_s *window);
+
+void vx_win_set_title(vx_window_s *window, const char *title);
+void vx_win_resize(vx_window_s *window, vx_vec2u_s size);
+void vx_win_move(vx_window_s *window, vx_vec2i_s position);
+void vx_win_show(vx_window_s *window);
+void vx_win_hide(vx_window_s *window);
+void vx_win_present(vx_window_s *window);
+
+#endif // VOXULA_WINDOW_H

modules/window/includes.txt

@@ -1,3 +1,4 @@
 {module}/inc-c
 {module-folder}/utility/inc-c
 {module-folder}/ecs/inc-c
+{dependencies}/inc-c

modules/window/src-c/window.c

@@ -0,0 +1,164 @@
+#include <voxula/internals/window.h>
+#include <glad/glad.h>
+
+vx_window_s * vx_find_window_with_id(vx_input_controller_s *controller, uint32_t window_id)
+{
+    uint32_t window_index = 0;
+    while(window_index < controller->num_windows)
+    {
+        if(window_id == SDL_GetWindowID(controller->windows[window_index]->window))
+        {
+            return controller->windows[window_index];
+        }
+        ++window_index;
+    }
+    return NULL;
+}
+
+int vx_input_controller_mainloop(void *userdata)
+{
+    vx_input_controller_s *controller = userdata;
+    controller->running = true;
+    while(controller->running)
+    {
+        SDL_Event event;
+        while(SDL_PollEvent(&event))
+        {
+            if(event.type == SDL_WINDOWEVENT_CLOSE)
+            {
+                vx_window_s *window = vx_find_window_with_id(controller, event.window.windowID);
+                if(window == NULL)
+                {
+                    continue;
+                }
+                if(window->fn_handle_input == NULL)
+                {
+                    continue;
+                }
+                vx_window_event_s quit_event;
+                quit_event.type = VX_WINDOW_EVENT_CLOSE;
+                quit_event.association = window;
+                window->fn_handle_input(window, quit_event);
+            }
+            if(event.type == SDL_QUIT)
+            {
+                vx_window_event_s quit_event;
+                quit_event.type = VX_WINDOW_EVENT_QUIT;
+                quit_event.association = NULL;
+                uint32_t window_index = 0;
+                while(window_index < controller->num_windows)
+                {
+                    vx_window_s *window = controller->windows[window_index];
+                    window->fn_handle_input(window, quit_event);
+                    ++window_index;
+                }
+                controller->running = false;
+            }
+        }
+        SDL_Delay(2);
+    }
+    return 0;
+}
+
+vx_input_controller_s * vx_new_input_controller()
+{
+    vx_input_controller_s *controller = malloc(sizeof(vx_input_controller_s));
+    controller->num_windows = 0;
+    controller->window_list_capacity = 8;
+    controller->windows = malloc(controller->window_list_capacity * sizeof(vx_window_s));
+    thrd_create(&controller->thread, vx_input_controller_mainloop, controller);
+
+    return controller;
+}
+
+void vx_free_input_controller(vx_input_controller_s *controller)
+{
+    uint32_t window_index = 0;
+    while(window_index < controller->num_windows)
+    {
+        vx_window_s *window = controller->windows[window_index];
+        vx_free_window(window);
+        ++window_index;
+    }
+    controller->running = false;
+    thrd_join(controller->thread, NULL);
+    free(controller->windows);
+    free(controller);
+}
+
+void vx_start_input_controller(vx_input_controller_s *controller)
+{
+    controller->running = true;
+    thrd_detach(controller->thread);
+}
+
+void vx_stop_input_controller(vx_input_controller_s *controller)
+{
+    controller->running = false;
+}
+
+vx_window_s * vx_new_window(vx_input_controller_s *controller)
+{
+    vx_window_s *window = malloc(sizeof(vx_window_s));
+    if(controller->window_list_capacity >= controller->num_windows)
+    {
+        controller->window_list_capacity *= 2;
+        controller->windows = realloc(
+            controller->windows,
+            controller->window_list_capacity
+          * sizeof(vx_window_s *)
+        );
+    }
+    controller->windows[controller->num_windows++] = window;
+    window->controller = controller;
+    window->window = SDL_CreateWindow(
+        "Voxula Window",
+        SDL_WINDOWPOS_CENTERED,
+        SDL_WINDOWPOS_CENTERED,
+        1200,
+        750,
+        SDL_WINDOW_HIDDEN | SDL_WINDOW_OPENGL
+    );
+    window->gl_context = SDL_GL_CreateContext(window->window);
+    gladLoadGLLoader(SDL_GL_GetProcAddress);
+    gladLoadGL();
+
+    return window;
+}
+
+void vx_free_window(vx_window_s *window)
+{
+    SDL_DestroyWindow(window->window);
+    SDL_GL_DeleteContext(window->gl_context);
+    free(window);
+}
+
+void vx_win_set_title(vx_window_s *window, const char *title)
+{
+    SDL_SetWindowTitle(window->window, title);
+}
+
+void vx_win_resize(vx_window_s *window, vx_vec2u_s size)
+{
+    SDL_SetWindowSize(window->window, size.x, size.y);
+}
+
+void vx_win_move(vx_window_s *window, vx_vec2i_s position)
+{
+    SDL_SetWindowPosition(window->window, position.x, position.y);
+}
+
+void vx_win_show(vx_window_s *window)
+{
+    SDL_ShowWindow(window->window);
+}
+
+void vx_win_hide(vx_window_s *window)
+{
+    SDL_HideWindow(window->window);
+}
+
+void vx_win_present(vx_window_s *window)
+{
+    SDL_GL_SwapWindow(window->window);
+}