//========================================================================
// GLFW - An OpenGL library
// Platform:    X11/GLX
// API version: 3.0
// WWW:         http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would
//    be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
//    be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
//    distribution.
//
//========================================================================

#ifndef _platform_h_
#define _platform_h_

#include <unistd.h>
#include <signal.h>
#include <stdint.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/Xatom.h>

#define GLX_GLXEXT_LEGACY
#include <GL/glx.h>

// This path may need to be changed if you build GLFW using your own setup
// GLFW comes with its own copy of glxext.h since it uses some fairly new
// extensions and not all operating systems come with an up-to-date version
#include "../support/GL/glxext.h"

// The XF86VidMode extension provides mode setting and gamma control
#if defined(_GLFW_HAS_XF86VIDMODE)
 #include <X11/extensions/xf86vmode.h>
#endif

// The XRandR extension provides mode setting and gamma control
#if defined(_GLFW_HAS_XRANDR)
 #include <X11/extensions/Xrandr.h>
#endif

// dlopen is used as a fallback function retrieval mechanism
#if defined(_GLFW_HAS_DLOPEN)
 #include <dlfcn.h>
#endif

// The Xkb extension provides improved keyboard support
#if defined(_GLFW_HAS_XKB)
 #include <X11/XKBlib.h>
#endif

// GLFW supports four different ways for getting addresses for GL/GLX
// extension functions: glXGetProcAddress, glXGetProcAddressARB,
// glXGetProcAddressEXT, and dlsym
#if defined(_GLFW_HAS_GLXGETPROCADDRESSARB)
 #define _glfw_glXGetProcAddress(x) glXGetProcAddressARB(x)
#elif defined(_GLFW_HAS_GLXGETPROCADDRESS)
 #define _glfw_glXGetProcAddress(x) glXGetProcAddress(x)
#elif defined(_GLFW_HAS_GLXGETPROCADDRESSEXT)
 #define _glfw_glXGetProcAddress(x) glXGetProcAddressEXT(x)
#elif defined(_GLFW_HAS_DLOPEN)
 #define _glfw_glXGetProcAddress(x) dlsym(_glfwLibrary.GLX.libGL, x)
 #define _GLFW_DLOPEN_LIBGL
#else
 #error "No OpenGL entry point retrieval mechanism was enabled"
#endif

#define _GLFW_PLATFORM_WINDOW_STATE  _GLFWwindowX11 X11
#define _GLFW_PLATFORM_CONTEXT_STATE _GLFWcontextGLX GLX
#define _GLFW_PLATFORM_LIBRARY_WINDOW_STATE _GLFWlibraryX11 X11
#define _GLFW_PLATFORM_LIBRARY_OPENGL_STATE _GLFWlibraryGLX GLX

// Clipboard format atom indices
#define _GLFW_CLIPBOARD_FORMAT_UTF8     0
#define _GLFW_CLIPBOARD_FORMAT_COMPOUND 1
#define _GLFW_CLIPBOARD_FORMAT_STRING   2
#define _GLFW_CLIPBOARD_FORMAT_COUNT    3

// Clipboard conversion status tokens
#define _GLFW_CONVERSION_INACTIVE       0
#define _GLFW_CONVERSION_SUCCEEDED      1
#define _GLFW_CONVERSION_FAILED         2

#ifndef GLX_MESA_swap_control
typedef int (*PFNGLXSWAPINTERVALMESAPROC)(int);
#endif


//========================================================================
// GLFW platform specific types
//========================================================================

//------------------------------------------------------------------------
// Pointer length integer
//------------------------------------------------------------------------
typedef intptr_t GLFWintptr;


//------------------------------------------------------------------------
// Platform-specific OpenGL context structure
//------------------------------------------------------------------------
typedef struct _GLFWcontextGLX
{
    GLXContext    context;           // OpenGL rendering context
    XVisualInfo*  visual;            // Visual for selected GLXFBConfig

} _GLFWcontextGLX;


//------------------------------------------------------------------------
// Platform-specific window structure
//------------------------------------------------------------------------
typedef struct _GLFWwindowX11
{
    // Platform specific window resources
    Colormap      colormap;          // Window colormap
    Window        handle;            // Window handle

    // Various platform specific internal variables
    GLboolean     overrideRedirect; // True if window is OverrideRedirect
    GLboolean     cursorGrabbed;    // True if cursor is currently grabbed
    GLboolean     cursorHidden;     // True if cursor is currently hidden
    GLboolean     cursorCentered;   // True if cursor was moved since last poll
    int           cursorPosX, cursorPosY;

    // Window position hint (commited the first time the window is shown)
    GLboolean     windowPosSet;     // False until the window position has
                                    // been set
    int           positionX;        // The window position to be set the
    int           positionY;        // first time the window is shown

} _GLFWwindowX11;


//------------------------------------------------------------------------
// Platform-specific library global data for X11
//------------------------------------------------------------------------
typedef struct _GLFWlibraryX11
{
    Display*        display;
    int             screen;
    Window          root;
    Cursor          cursor;   // Invisible cursor for hidden cursor

    Atom            wmDeleteWindow;    // WM_DELETE_WINDOW atom
    Atom            wmName;            // _NET_WM_NAME atom
    Atom            wmIconName;        // _NET_WM_ICON_NAME atom
    Atom            wmPing;            // _NET_WM_PING atom
    Atom            wmState;           // _NET_WM_STATE atom
    Atom            wmStateFullscreen; // _NET_WM_STATE_FULLSCREEN atom
    Atom            wmActiveWindow;    // _NET_ACTIVE_WINDOW atom

    // True if window manager supports EWMH
    GLboolean       hasEWMH;

    struct {
        GLboolean   available;
        int         eventBase;
        int         errorBase;
    } VidMode;

    struct {
        GLboolean   available;
        int         eventBase;
        int         errorBase;
        int         majorVersion;
        int         minorVersion;
        GLboolean   gammaBroken;
    } RandR;

    struct {
        GLboolean   available;
        int         majorOpcode;
        int         eventBase;
        int         errorBase;
        int         majorVersion;
        int         minorVersion;
    } Xkb;

    // Key code LUT (mapping X11 key codes to GLFW key codes)
    int             keyCodeLUT[256];

    // Screensaver data
    struct {
        GLboolean   changed;
        int         timeout;
        int         interval;
        int         blanking;
        int         exposure;
    } saver;

    // Fullscreen data
    struct {
        GLboolean   modeChanged;
#if defined(_GLFW_HAS_XRANDR)
        SizeID      oldSizeID;
        int         oldWidth;
        int         oldHeight;
        Rotation    oldRotation;
#endif /*_GLFW_HAS_XRANDR*/
#if defined(_GLFW_HAS_XF86VIDMODE)
        XF86VidModeModeInfo oldMode;
#endif /*_GLFW_HAS_XF86VIDMODE*/
    } FS;

    // Timer data
    struct {
        GLboolean   monotonic;
        double      resolution;
        uint64_t    base;
    } timer;

    // Selection data
    struct {
        Atom atom;
        Atom formats[_GLFW_CLIPBOARD_FORMAT_COUNT];
        char* string;
        Atom target;
        Atom targets;
        Atom property;
        int status;
    } selection;

    struct {
        int             present;
        int             fd;
        int             numAxes;
        int             numButtons;
        float*          axis;
        unsigned char*  button;
    } joystick[GLFW_JOYSTICK_LAST + 1];

} _GLFWlibraryX11;


//------------------------------------------------------------------------
// Platform-specific library global data for GLX
//------------------------------------------------------------------------
typedef struct _GLFWlibraryGLX
{
    // Server-side GLX version
    int             majorVersion, minorVersion;

    // GLX extensions
    PFNGLXSWAPINTERVALSGIPROC             SwapIntervalSGI;
    PFNGLXSWAPINTERVALEXTPROC             SwapIntervalEXT;
    PFNGLXSWAPINTERVALMESAPROC            SwapIntervalMESA;
    PFNGLXGETFBCONFIGATTRIBSGIXPROC       GetFBConfigAttribSGIX;
    PFNGLXCHOOSEFBCONFIGSGIXPROC          ChooseFBConfigSGIX;
    PFNGLXCREATECONTEXTWITHCONFIGSGIXPROC CreateContextWithConfigSGIX;
    PFNGLXGETVISUALFROMFBCONFIGSGIXPROC   GetVisualFromFBConfigSGIX;
    PFNGLXCREATECONTEXTATTRIBSARBPROC     CreateContextAttribsARB;
    GLboolean   SGIX_fbconfig;
    GLboolean   SGI_swap_control;
    GLboolean   EXT_swap_control;
    GLboolean   MESA_swap_control;
    GLboolean   ARB_multisample;
    GLboolean   ARB_framebuffer_sRGB;
    GLboolean   ARB_create_context;
    GLboolean   ARB_create_context_profile;
    GLboolean   ARB_create_context_robustness;
    GLboolean   EXT_create_context_es2_profile;

#if defined(_GLFW_DLOPEN_LIBGL)
    void*           libGL;  // dlopen handle for libGL.so
#endif
} _GLFWlibraryGLX;


//========================================================================
// Prototypes for platform specific internal functions
//========================================================================

// Time
void _glfwInitTimer(void);

// Gamma
void _glfwInitGammaRamp(void);
void _glfwTerminateGammaRamp(void);

// OpenGL support
int _glfwInitOpenGL(void);
void _glfwTerminateOpenGL(void);
int _glfwCreateContext(_GLFWwindow* window,
                       const _GLFWwndconfig* wndconfig,
                       const _GLFWfbconfig* fbconfig);
void _glfwDestroyContext(_GLFWwindow* window);
XVisualInfo* _glfwGetContextVisual(_GLFWwindow* window);

// Fullscreen support
int  _glfwGetClosestVideoMode(int* width, int* height, int* rate);
void _glfwSetVideoModeMODE(int mode, int rate);
void _glfwSetVideoMode(int* width, int* height, int* rate);
void _glfwRestoreVideoMode(void);

// Joystick input
int  _glfwInitJoysticks(void);
void _glfwTerminateJoysticks(void);

// Unicode support
long _glfwKeySym2Unicode(KeySym keysym);

// Clipboard handling
GLboolean _glfwReadSelection(XSelectionEvent* request);
Atom _glfwWriteSelection(XSelectionRequestEvent* request);

// Event processing
void _glfwProcessPendingEvents(void);

#endif // _platform_h_