adding gfx and ui stuff

gfx/platform.h

@@ -0,0 +1,91 @@
+#ifndef PLATFORM_H
+#define PLATFORM_H
+
+#include "../core.h"
+
+typedef struct OS_Input OS_Input;
+struct OS_Input {
+    struct {
+        bool escape;
+        bool enter;
+        bool space;
+        bool lshift;
+        bool x;
+        bool y;
+        bool z;
+        bool w;
+    } keyboard;
+    struct {
+        union {
+            struct {
+                real32 x;
+                real32 y;
+            };
+            Vec2 point;
+        };
+        struct {
+            real64 dX;
+            real64 dY;
+        } scroll;
+        bool btnLeft;
+        bool btnRight;
+        bool btnMiddle;
+    } mouse;
+};
+
+enum OS_WindowEventKind {
+    OS_WindowEventKind_Resize,
+
+    // ---
+    OS_WindowEventKind_Count,
+};
+
+typedef struct OS_WindowEvent OS_WindowEvent;
+struct OS_WindowEvent {
+    enum OS_WindowEventKind kind;
+    union {
+        struct {
+            int32 width;
+            int32 height;
+        } resize;
+    };
+};
+
+struct OS_Window;
+typedef void (*OS_WindowEventCallback)(OS_WindowEvent *e, struct OS_Window *userData);
+
+typedef struct OS_WindowInitParams OS_WindowInitParams;
+struct OS_WindowInitParams {
+    string name;
+    int32 width;
+    int32 height;
+    void *data;
+    OS_WindowEventCallback eventHandler;
+};
+
+typedef struct OS_Window OS_Window;
+struct OS_Window {
+    void *handle;
+    int32 width;
+    int32 height;
+    real64 fps;
+    void *userData;
+    void *platformData;
+    struct {
+        real64 start;
+        real64 fps;
+    } frame;
+};
+
+
+DefineResult(OS_Window*, OS_WindowInit);
+OS_WindowInitResult os_windowInit(Arena *arena, OS_WindowInitParams params);
+bool os_windowShouldClose(OS_Window *window);
+void os_windowProcessEvents(OS_Window *window);
+void os_windowGetInput(OS_Window *window, OS_Input *input);
+void os_windowSwapBuffers(OS_Window *window);
+void os_windowFrameBegin(OS_Window *window);
+void os_windowFrameEnd(OS_Window *window);
+void os_windowTerminate(OS_Window *window);
+
+#endif