use modern opengl

data/glsl/rotate_by_angle.frag

@@ -0,0 +1,12 @@
+#version 120
+
+uniform sampler2D sampler;
+
+varying vec2 tex_coord0;
+
+void main()
+{
+  gl_FragColor =
+    texture2D (sampler, tex_coord0);
+  gl_FragColor = vec4 (1.0, 0.0, 0.0, 1.0);
+}

data/glsl/rotate_by_angle.vert

@@ -1,8 +1,12 @@
 #version 130
 
+attribute vec2 position;
+attribute vec2 tex_coord;
+
 /* angle to rotate with */
 uniform float _angle;
-varying vec2 mypos;
+
+varying vec2 tex_coord0;
 
 mat2 rotation2d(float angle) {
   float s = sin(angle);
@@ -20,8 +24,15 @@ vec2 rotate(vec2 v, float angle) {
 
 void main()
 {
-  mypos = gl_Vertex.xy - vec2(-0.5f,-0.5f);
+  vec4 vertex_pos =
+    gl_ModelViewProjectionMatrix *
+    vec4 (position, 0.0, 1.0);
+  vec2 mypos = vertex_pos.xy;
+  mypos = mypos - vec2(-0.5f,-0.5f);
   mypos = rotate (mypos, _angle);
   mypos = mypos + vec2(0.5f,0.5f);
-  gl_Position = vec4 (mypos, gl_Vertex.z, 1.0);
+
+  tex_coord0 = tex_coord;
+
+  gl_Position = vec4 (mypos, 0.0, 1.0);
 }

data/glsl/unchanged.frag

@@ -0,0 +1,16 @@
+#version 430
+
+/* this is the currently bound texture */
+uniform sampler2D sampler;
+
+/* tex coordinate passed from vertex shader */
+varying vec2 tex_coord0;
+
+/* equivalent to gl_FragColor */
+out vec4 out_color;
+
+void main()
+{
+  out_color =
+    texture2D (sampler, tex_coord0);
+}

data/glsl/unchanged.vert

@@ -0,0 +1,52 @@
+#version 430
+
+/* screen size we can use to convert the coordinates
+ * from screen space to [-1...1] */
+uniform vec2 screen;
+
+/* angle to rotate by, or 0 to not rotate */
+uniform float angle;
+
+/* vertex position in screen coordinates */
+attribute vec2 position;
+
+/* texture coordinate in ([0...1],[0...1]) */
+attribute vec2 tex_coord;
+
+/* tex coordinate to pass to fragment shader */
+varying vec2 tex_coord0;
+
+mat2 rotation2d(float angle) {
+  float s = sin(angle);
+  float c = cos(angle);
+
+  return mat2(
+    c, -s,
+    s, c
+  );
+}
+
+vec2 rotate(vec2 v, float angle) {
+  return rotation2d(angle) * v;
+}
+
+void main()
+{
+  tex_coord0 = tex_coord;
+
+  /* rotate if necessary */
+  vec2 mypos = position.xy;
+  if (angle > 0.1 || angle < -0.1)
+    {
+      mypos = rotate (vec2 (0, 0), angle);
+      mypos = mypos + position.xy;
+    }
+
+  /* convert to shader coordinates [-1...1] on each
+   * axis */
+  gl_Position =
+    vec4 (
+      (mypos.x / screen.x) * 2 - 1.0,
+      (mypos.y / screen.y) * 2 - 1.0,
+      0.0, 1.0);;
+}

data/meson.build

@@ -0,0 +1,23 @@
+# Copyright (C) 2019 Alexandros Theodotou <alex at zrythm dot org>
+#
+# This file is part of Ion
+#
+# Ion is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ion is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with Ion.  If not, see <https://www.gnu.org/licenses/>.
+
+install_data (
+  join_paths ('glsl', 'unchanged.vert'),
+  install_dir: glsldir)
+install_data (
+  join_paths ('glsl', 'unchanged.frag'),
+  install_dir: glsldir)

inc/KHR/khrplatform.h

@@ -0,0 +1,290 @@
+#ifndef __khrplatform_h_
+#define __khrplatform_h_
+
+/*
+** Copyright (c) 2008-2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+/* Khronos platform-specific types and definitions.
+ *
+ * The master copy of khrplatform.h is maintained in the Khronos EGL
+ * Registry repository at https://github.com/KhronosGroup/EGL-Registry
+ * The last semantic modification to khrplatform.h was at commit ID:
+ *      67a3e0864c2d75ea5287b9f3d2eb74a745936692
+ *
+ * Adopters may modify this file to suit their platform. Adopters are
+ * encouraged to submit platform specific modifications to the Khronos
+ * group so that they can be included in future versions of this file.
+ * Please submit changes by filing pull requests or issues on
+ * the EGL Registry repository linked above.
+ *
+ *
+ * See the Implementer's Guidelines for information about where this file
+ * should be located on your system and for more details of its use:
+ *    http://www.khronos.org/registry/implementers_guide.pdf
+ *
+ * This file should be included as
+ *        #include <KHR/khrplatform.h>
+ * by Khronos client API header files that use its types and defines.
+ *
+ * The types in khrplatform.h should only be used to define API-specific types.
+ *
+ * Types defined in khrplatform.h:
+ *    khronos_int8_t              signed   8  bit
+ *    khronos_uint8_t             unsigned 8  bit
+ *    khronos_int16_t             signed   16 bit
+ *    khronos_uint16_t            unsigned 16 bit
+ *    khronos_int32_t             signed   32 bit
+ *    khronos_uint32_t            unsigned 32 bit
+ *    khronos_int64_t             signed   64 bit
+ *    khronos_uint64_t            unsigned 64 bit
+ *    khronos_intptr_t            signed   same number of bits as a pointer
+ *    khronos_uintptr_t           unsigned same number of bits as a pointer
+ *    khronos_ssize_t             signed   size
+ *    khronos_usize_t             unsigned size
+ *    khronos_float_t             signed   32 bit floating point
+ *    khronos_time_ns_t           unsigned 64 bit time in nanoseconds
+ *    khronos_utime_nanoseconds_t unsigned time interval or absolute time in
+ *                                         nanoseconds
+ *    khronos_stime_nanoseconds_t signed time interval in nanoseconds
+ *    khronos_boolean_enum_t      enumerated boolean type. This should
+ *      only be used as a base type when a client API's boolean type is
+ *      an enum. Client APIs which use an integer or other type for
+ *      booleans cannot use this as the base type for their boolean.
+ *
+ * Tokens defined in khrplatform.h:
+ *
+ *    KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
+ *
+ *    KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
+ *    KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
+ *
+ * Calling convention macros defined in this file:
+ *    KHRONOS_APICALL
+ *    KHRONOS_APIENTRY
+ *    KHRONOS_APIATTRIBUTES
+ *
+ * These may be used in function prototypes as:
+ *
+ *      KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
+ *                                  int arg1,
+ *                                  int arg2) KHRONOS_APIATTRIBUTES;
+ */
+
+#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
+#   define KHRONOS_STATIC 1
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(KHRONOS_STATIC)
+    /* If the preprocessor constant KHRONOS_STATIC is defined, make the
+     * header compatible with static linking. */
+#   define KHRONOS_APICALL
+#elif defined(_WIN32)
+#   define KHRONOS_APICALL __declspec(dllimport)
+#elif defined (__SYMBIAN32__)
+#   define KHRONOS_APICALL IMPORT_C
+#elif defined(__ANDROID__)
+#   define KHRONOS_APICALL __attribute__((visibility("default")))
+#else
+#   define KHRONOS_APICALL
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIENTRY
+ *-------------------------------------------------------------------------
+ * This follows the return type of the function  and precedes the function
+ * name in the function prototype.
+ */
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(KHRONOS_STATIC)
+    /* Win32 but not WinCE */
+#   define KHRONOS_APIENTRY __stdcall
+#else
+#   define KHRONOS_APIENTRY
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIATTRIBUTES
+ *-------------------------------------------------------------------------
+ * This follows the closing parenthesis of the function prototype arguments.
+ */
+#if defined (__ARMCC_2__)
+#define KHRONOS_APIATTRIBUTES __softfp
+#else
+#define KHRONOS_APIATTRIBUTES
+#endif
+
+/*-------------------------------------------------------------------------
+ * basic type definitions
+ *-----------------------------------------------------------------------*/
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
+
+
+/*
+ * Using <stdint.h>
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__VMS ) || defined(__sgi)
+
+/*
+ * Using <inttypes.h>
+ */
+#include <inttypes.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
+
+/*
+ * Win32
+ */
+typedef __int32                 khronos_int32_t;
+typedef unsigned __int32        khronos_uint32_t;
+typedef __int64                 khronos_int64_t;
+typedef unsigned __int64        khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__sun__) || defined(__digital__)
+
+/*
+ * Sun or Digital
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#if defined(__arch64__) || defined(_LP64)
+typedef long int                khronos_int64_t;
+typedef unsigned long int       khronos_uint64_t;
+#else
+typedef long long int           khronos_int64_t;
+typedef unsigned long long int  khronos_uint64_t;
+#endif /* __arch64__ */
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif 0
+
+/*
+ * Hypothetical platform with no float or int64 support
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#define KHRONOS_SUPPORT_INT64   0
+#define KHRONOS_SUPPORT_FLOAT   0
+
+#else
+
+/*
+ * Generic fallback
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#endif
+
+
+/*
+ * Types that are (so far) the same on all platforms
+ */
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+
+/*
+ * Types that differ between LLP64 and LP64 architectures - in LLP64,
+ * pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
+ * to be the only LLP64 architecture in current use.
+ */
+#ifdef _WIN64
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+typedef signed   long  int     khronos_ssize_t;
+typedef unsigned long  int     khronos_usize_t;
+#endif
+
+#if KHRONOS_SUPPORT_FLOAT
+/*
+ * Float type
+ */
+typedef          float         khronos_float_t;
+#endif
+
+#if KHRONOS_SUPPORT_INT64
+/* Time types
+ *
+ * These types can be used to represent a time interval in nanoseconds or
+ * an absolute Unadjusted System Time.  Unadjusted System Time is the number
+ * of nanoseconds since some arbitrary system event (e.g. since the last
+ * time the system booted).  The Unadjusted System Time is an unsigned
+ * 64 bit value that wraps back to 0 every 584 years.  Time intervals
+ * may be either signed or unsigned.
+ */
+typedef khronos_uint64_t       khronos_utime_nanoseconds_t;
+typedef khronos_int64_t        khronos_stime_nanoseconds_t;
+#endif
+
+/*
+ * Dummy value used to pad enum types to 32 bits.
+ */
+#ifndef KHRONOS_MAX_ENUM
+#define KHRONOS_MAX_ENUM 0x7FFFFFFF
+#endif
+
+/*
+ * Enumerated boolean type
+ *
+ * Values other than zero should be considered to be true.  Therefore
+ * comparisons should not be made against KHRONOS_TRUE.
+ */
+typedef enum {
+    KHRONOS_FALSE = 0,
+    KHRONOS_TRUE  = 1,
+    KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
+} khronos_boolean_enum_t;
+
+#endif /* __khrplatform_h_ */

inc/game/ion_world.h

@@ -30,6 +30,7 @@ typedef struct GLFWwindow GLFWwindow;
 typedef struct SkinManager SkinManager;
 typedef struct Texture Texture;
 typedef struct ShaderManager ShaderManager;
+typedef struct MainMenu MainMenu;
 
 /**
  * @addtogroup game
@@ -75,6 +76,12 @@ typedef struct IonWorld
   /** The game GLFW window. */
   GLFWwindow *     window;
 
+  int              viewport_width;
+  int              viewport_height;
+
+  int              monitor_width;
+  int              monitor_height;
+
   char *           skins_dir;
   char *           beatmaps_dir;
 
@@ -87,6 +94,8 @@ typedef struct IonWorld
   /* FIXME delete */
   Texture *        test_texture;
 
+  MainMenu *       main_menu;
+
   ShaderManager *  shader_manager;
 } IonWorld;
 
@@ -98,7 +107,13 @@ IonWorld * ion_world;
  */
 IonWorld *
 ion_world_new (
-  GLFWwindow * window);
+  GLFWwindow * window,
+  int          monitor_width,
+  int          monitor_height);
+
+void
+ion_world_load_skin (
+  IonWorld * self);
 
 /**
  * To be called when the framebuffer size changes.

inc/glad/glad_glx.h

@@ -0,0 +1,434 @@
+/*
+
+    GLX loader generated by glad 0.1.33 on Fri Nov 29 01:47:21 2019.
+
+    Language/Generator: C/C++
+    Specification: glx
+    APIs: glx=1.4
+    Profile: -
+    Extensions:
+        
+    Loader: True
+    Local files: False
+    Omit khrplatform: False
+    Reproducible: False
+
+    Commandline:
+        --api="glx=1.4" --generator="c" --spec="glx" --extensions=""
+    Online:
+        https://glad.dav1d.de/#language=c&specification=glx&loader=on&api=glx%3D1.4
+*/
+
+
+#include <X11/X.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <glad/glad.h>
+
+#ifndef __glad_glxext_h_
+
+#ifdef __glxext_h_
+#error GLX header already included, remove this include, glad already provides it
+#endif
+
+#define __glad_glxext_h_
+#define __glxext_h_
+
+#ifndef APIENTRY
+#define APIENTRY
+#endif
+#ifndef APIENTRYP
+#define APIENTRYP APIENTRY *
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void* (* GLADloadproc)(const char *name);
+
+#ifndef GLAPI
+# if defined(GLAD_GLAPI_EXPORT)
+#  if defined(_WIN32) || defined(__CYGWIN__)
+#   if defined(GLAD_GLAPI_EXPORT_BUILD)
+#    if defined(__GNUC__)
+#     define GLAPI __attribute__ ((dllexport)) extern
+#    else
+#     define GLAPI __declspec(dllexport) extern
+#    endif
+#   else
+#    if defined(__GNUC__)
+#     define GLAPI __attribute__ ((dllimport)) extern
+#    else
+#     define GLAPI __declspec(dllimport) extern
+#    endif
+#   endif
+#  elif defined(__GNUC__) && defined(GLAD_GLAPI_EXPORT_BUILD)
+#   define GLAPI __attribute__ ((visibility ("default"))) extern
+#  else
+#   define GLAPI extern
+#  endif
+# else
+#  define GLAPI extern
+# endif
+#endif
+
+GLAPI int gladLoadGLX(Display *dpy, int screen);
+
+GLAPI int gladLoadGLXLoader(GLADloadproc, Display *dpy, int screen);
+
+#ifndef GLEXT_64_TYPES_DEFINED
+/* This code block is duplicated in glext.h, so must be protected */
+#define GLEXT_64_TYPES_DEFINED
+/* Define int32_t, int64_t, and uint64_t types for UST/MSC */
+/* (as used in the GLX_OML_sync_control extension). */
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+#include <inttypes.h>
+#elif defined(__sun__) || defined(__digital__)
+#include <inttypes.h>
+#if defined(__STDC__)
+#if defined(__arch64__) || defined(_LP64)
+typedef long int int64_t;
+typedef unsigned long int uint64_t;
+#else
+typedef long long int int64_t;
+typedef unsigned long long int uint64_t;
+#endif /* __arch64__ */
+#endif /* __STDC__ */
+#elif defined( __VMS ) || defined(__sgi)
+#include <inttypes.h>
+#elif defined(__SCO__) || defined(__USLC__)
+#include <stdint.h>
+#elif defined(__UNIXOS2__) || defined(__SOL64__)
+typedef long int int32_t;
+typedef long long int int64_t;
+typedef unsigned long long int uint64_t;
+#elif defined(_WIN32) && defined(__GNUC__)
+#include <stdint.h>
+#elif defined(_WIN32)
+typedef __int32 int32_t;
+typedef __int64 int64_t;
+typedef unsigned __int64 uint64_t;
+#else
+/* Fallback if nothing above works */
+#include <inttypes.h>
+#endif
+#endif
+typedef XID GLXFBConfigID;
+typedef struct __GLXFBConfigRec *GLXFBConfig;
+typedef XID GLXContextID;
+typedef struct __GLXcontextRec *GLXContext;
+typedef XID GLXPixmap;
+typedef XID GLXDrawable;
+typedef XID GLXWindow;
+typedef XID GLXPbuffer;
+typedef void (APIENTRY *__GLXextFuncPtr)(void);
+typedef XID GLXVideoCaptureDeviceNV;
+typedef unsigned int GLXVideoDeviceNV;
+typedef XID GLXVideoSourceSGIX;
+typedef XID GLXFBConfigIDSGIX;
+typedef struct __GLXFBConfigRec *GLXFBConfigSGIX;
+typedef XID GLXPbufferSGIX;
+typedef struct {
+    int event_type;      /* GLX_DAMAGED or GLX_SAVED */
+    int draw_type;       /* GLX_WINDOW or GLX_PBUFFER */
+    unsigned long serial;       /* # of last request processed by server */
+    Bool send_event;     /* true if this came for SendEvent request */
+    Display *display;    /* display the event was read from */
+    GLXDrawable drawable;       /* XID of Drawable */
+    unsigned int buffer_mask;   /* mask indicating which buffers are affected */
+    unsigned int aux_buffer;    /* which aux buffer was affected */
+    int x, y;
+    int width, height;
+    int count;    /* if nonzero, at least this many more */
+} GLXPbufferClobberEvent;
+typedef struct {
+    int type;
+    unsigned long serial;       /* # of last request processed by server */
+    Bool send_event;     /* true if this came from a SendEvent request */
+    Display *display;    /* Display the event was read from */
+    GLXDrawable drawable;       /* drawable on which event was requested in event mask */
+    int event_type;
+    int64_t ust;
+    int64_t msc;
+    int64_t sbc;
+} GLXBufferSwapComplete;
+typedef union __GLXEvent {
+    GLXPbufferClobberEvent glxpbufferclobber;
+    GLXBufferSwapComplete glxbufferswapcomplete;
+    long pad[24];
+} GLXEvent;
+typedef struct {
+    int type;
+    unsigned long serial;
+    Bool send_event;
+    Display *display;
+    int extension;
+    int evtype;
+    GLXDrawable window;
+    Bool stereo_tree;
+} GLXStereoNotifyEventEXT;
+typedef struct {
+    int type;
+    unsigned long serial;   /* # of last request processed by server */
+    Bool send_event; /* true if this came for SendEvent request */
+    Display *display;       /* display the event was read from */
+    GLXDrawable drawable;   /* i.d. of Drawable */
+    int event_type;  /* GLX_DAMAGED_SGIX or GLX_SAVED_SGIX */
+    int draw_type;   /* GLX_WINDOW_SGIX or GLX_PBUFFER_SGIX */
+    unsigned int mask;      /* mask indicating which buffers are affected*/
+    int x, y;
+    int width, height;
+    int count;       /* if nonzero, at least this many more */
+} GLXBufferClobberEventSGIX;
+typedef struct {
+    char    pipeName[80]; /* Should be [GLX_HYPERPIPE_PIPE_NAME_LENGTH_SGIX] */
+    int     networkId;
+} GLXHyperpipeNetworkSGIX;
+typedef struct {
+    char    pipeName[80]; /* Should be [GLX_HYPERPIPE_PIPE_NAME_LENGTH_SGIX] */
+    int     channel;
+    unsigned int participationType;
+    int     timeSlice;
+} GLXHyperpipeConfigSGIX;
+typedef struct {
+    char pipeName[80]; /* Should be [GLX_HYPERPIPE_PIPE_NAME_LENGTH_SGIX] */
+    int srcXOrigin, srcYOrigin, srcWidth, srcHeight;
+    int destXOrigin, destYOrigin, destWidth, destHeight;
+} GLXPipeRect;
+typedef struct {
+    char pipeName[80]; /* Should be [GLX_HYPERPIPE_PIPE_NAME_LENGTH_SGIX] */
+    int XOrigin, YOrigin, maxHeight, maxWidth;
+} GLXPipeRectLimits;
+#define GLX_EXTENSION_NAME "GLX"
+#define GLX_PbufferClobber 0
+#define GLX_BufferSwapComplete 1
+#define __GLX_NUMBER_EVENTS 17
+#define GLX_BAD_SCREEN 1
+#define GLX_BAD_ATTRIBUTE 2
+#define GLX_NO_EXTENSION 3
+#define GLX_BAD_VISUAL 4
+#define GLX_BAD_CONTEXT 5
+#define GLX_BAD_VALUE 6
+#define GLX_BAD_ENUM 7
+#define GLX_USE_GL 1
+#define GLX_BUFFER_SIZE 2
+#define GLX_LEVEL 3
+#define GLX_RGBA 4
+#define GLX_DOUBLEBUFFER 5
+#define GLX_STEREO 6
+#define GLX_AUX_BUFFERS 7
+#define GLX_RED_SIZE 8
+#define GLX_GREEN_SIZE 9
+#define GLX_BLUE_SIZE 10
+#define GLX_ALPHA_SIZE 11
+#define GLX_DEPTH_SIZE 12
+#define GLX_STENCIL_SIZE 13
+#define GLX_ACCUM_RED_SIZE 14
+#define GLX_ACCUM_GREEN_SIZE 15
+#define GLX_ACCUM_BLUE_SIZE 16
+#define GLX_ACCUM_ALPHA_SIZE 17
+#define GLX_VENDOR 0x1
+#define GLX_VERSION 0x2
+#define GLX_EXTENSIONS 0x3
+#define GLX_WINDOW_BIT 0x00000001
+#define GLX_PIXMAP_BIT 0x00000002
+#define GLX_PBUFFER_BIT 0x00000004
+#define GLX_RGBA_BIT 0x00000001
+#define GLX_COLOR_INDEX_BIT 0x00000002
+#define GLX_PBUFFER_CLOBBER_MASK 0x08000000
+#define GLX_FRONT_LEFT_BUFFER_BIT 0x00000001
+#define GLX_FRONT_RIGHT_BUFFER_BIT 0x00000002
+#define GLX_BACK_LEFT_BUFFER_BIT 0x00000004
+#define GLX_BACK_RIGHT_BUFFER_BIT 0x00000008
+#define GLX_AUX_BUFFERS_BIT 0x00000010
+#define GLX_DEPTH_BUFFER_BIT 0x00000020
+#define GLX_STENCIL_BUFFER_BIT 0x00000040
+#define GLX_ACCUM_BUFFER_BIT 0x00000080
+#define GLX_CONFIG_CAVEAT 0x20
+#define GLX_X_VISUAL_TYPE 0x22
+#define GLX_TRANSPARENT_TYPE 0x23
+#define GLX_TRANSPARENT_INDEX_VALUE 0x24
+#define GLX_TRANSPARENT_RED_VALUE 0x25
+#define GLX_TRANSPARENT_GREEN_VALUE 0x26
+#define GLX_TRANSPARENT_BLUE_VALUE 0x27
+#define GLX_TRANSPARENT_ALPHA_VALUE 0x28
+#define GLX_DONT_CARE 0xFFFFFFFF
+#define GLX_NONE 0x8000
+#define GLX_SLOW_CONFIG 0x8001
+#define GLX_TRUE_COLOR 0x8002
+#define GLX_DIRECT_COLOR 0x8003
+#define GLX_PSEUDO_COLOR 0x8004
+#define GLX_STATIC_COLOR 0x8005
+#define GLX_GRAY_SCALE 0x8006
+#define GLX_STATIC_GRAY 0x8007
+#define GLX_TRANSPARENT_RGB 0x8008
+#define GLX_TRANSPARENT_INDEX 0x8009
+#define GLX_VISUAL_ID 0x800B
+#define GLX_SCREEN 0x800C
+#define GLX_NON_CONFORMANT_CONFIG 0x800D
+#define GLX_DRAWABLE_TYPE 0x8010
+#define GLX_RENDER_TYPE 0x8011
+#define GLX_X_RENDERABLE 0x8012
+#define GLX_FBCONFIG_ID 0x8013
+#define GLX_RGBA_TYPE 0x8014
+#define GLX_COLOR_INDEX_TYPE 0x8015
+#define GLX_MAX_PBUFFER_WIDTH 0x8016
+#define GLX_MAX_PBUFFER_HEIGHT 0x8017
+#define GLX_MAX_PBUFFER_PIXELS 0x8018
+#define GLX_PRESERVED_CONTENTS 0x801B
+#define GLX_LARGEST_PBUFFER 0x801C
+#define GLX_WIDTH 0x801D
+#define GLX_HEIGHT 0x801E
+#define GLX_EVENT_MASK 0x801F
+#define GLX_DAMAGED 0x8020
+#define GLX_SAVED 0x8021
+#define GLX_WINDOW 0x8022
+#define GLX_PBUFFER 0x8023
+#define GLX_PBUFFER_HEIGHT 0x8040
+#define GLX_PBUFFER_WIDTH 0x8041
+#define GLX_SAMPLE_BUFFERS 100000
+#define GLX_SAMPLES 100001
+#ifndef GLX_VERSION_1_0
+#define GLX_VERSION_1_0 1
+GLAPI int GLAD_GLX_VERSION_1_0;
+typedef XVisualInfo * (APIENTRYP PFNGLXCHOOSEVISUALPROC)(Display *dpy, int screen, int *attribList);
+GLAPI PFNGLXCHOOSEVISUALPROC glad_glXChooseVisual;
+#define glXChooseVisual glad_glXChooseVisual
+typedef GLXContext (APIENTRYP PFNGLXCREATECONTEXTPROC)(Display *dpy, XVisualInfo *vis, GLXContext shareList, Bool direct);
+GLAPI PFNGLXCREATECONTEXTPROC glad_glXCreateContext;
+#define glXCreateContext glad_glXCreateContext
+typedef void (APIENTRYP PFNGLXDESTROYCONTEXTPROC)(Display *dpy, GLXContext ctx);
+GLAPI PFNGLXDESTROYCONTEXTPROC glad_glXDestroyContext;
+#define glXDestroyContext glad_glXDestroyContext
+typedef Bool (APIENTRYP PFNGLXMAKECURRENTPROC)(Display *dpy, GLXDrawable drawable, GLXContext ctx);
+GLAPI PFNGLXMAKECURRENTPROC glad_glXMakeCurrent;
+#define glXMakeCurrent glad_glXMakeCurrent
+typedef void (APIENTRYP PFNGLXCOPYCONTEXTPROC)(Display *dpy, GLXContext src, GLXContext dst, unsigned long mask);
+GLAPI PFNGLXCOPYCONTEXTPROC glad_glXCopyContext;
+#define glXCopyContext glad_glXCopyContext
+typedef void (APIENTRYP PFNGLXSWAPBUFFERSPROC)(Display *dpy, GLXDrawable drawable);
+GLAPI PFNGLXSWAPBUFFERSPROC glad_glXSwapBuffers;
+#define glXSwapBuffers glad_glXSwapBuffers
+typedef GLXPixmap (APIENTRYP PFNGLXCREATEGLXPIXMAPPROC)(Display *dpy, XVisualInfo *visual, Pixmap pixmap);
+GLAPI PFNGLXCREATEGLXPIXMAPPROC glad_glXCreateGLXPixmap;
+#define glXCreateGLXPixmap glad_glXCreateGLXPixmap
+typedef void (APIENTRYP PFNGLXDESTROYGLXPIXMAPPROC)(Display *dpy, GLXPixmap pixmap);
+GLAPI PFNGLXDESTROYGLXPIXMAPPROC glad_glXDestroyGLXPixmap;
+#define glXDestroyGLXPixmap glad_glXDestroyGLXPixmap
+typedef Bool (APIENTRYP PFNGLXQUERYEXTENSIONPROC)(Display *dpy, int *errorb, int *event);
+GLAPI PFNGLXQUERYEXTENSIONPROC glad_glXQueryExtension;
+#define glXQueryExtension glad_glXQueryExtension
+typedef Bool (APIENTRYP PFNGLXQUERYVERSIONPROC)(Display *dpy, int *maj, int *min);
+GLAPI PFNGLXQUERYVERSIONPROC glad_glXQueryVersion;
+#define glXQueryVersion glad_glXQueryVersion
+typedef Bool (APIENTRYP PFNGLXISDIRECTPROC)(Display *dpy, GLXContext ctx);
+GLAPI PFNGLXISDIRECTPROC glad_glXIsDirect;
+#define glXIsDirect glad_glXIsDirect
+typedef int (APIENTRYP PFNGLXGETCONFIGPROC)(Display *dpy, XVisualInfo *visual, int attrib, int *value);
+GLAPI PFNGLXGETCONFIGPROC glad_glXGetConfig;
+#define glXGetConfig glad_glXGetConfig
+typedef GLXContext (APIENTRYP PFNGLXGETCURRENTCONTEXTPROC)(void);
+GLAPI PFNGLXGETCURRENTCONTEXTPROC glad_glXGetCurrentContext;
+#define glXGetCurrentContext glad_glXGetCurrentContext
+typedef GLXDrawable (APIENTRYP PFNGLXGETCURRENTDRAWABLEPROC)(void);
+GLAPI PFNGLXGETCURRENTDRAWABLEPROC glad_glXGetCurrentDrawable;
+#define glXGetCurrentDrawable glad_glXGetCurrentDrawable
+typedef void (APIENTRYP PFNGLXWAITGLPROC)(void);
+GLAPI PFNGLXWAITGLPROC glad_glXWaitGL;
+#define glXWaitGL glad_glXWaitGL
+typedef void (APIENTRYP PFNGLXWAITXPROC)(void);
+GLAPI PFNGLXWAITXPROC glad_glXWaitX;
+#define glXWaitX glad_glXWaitX
+typedef void (APIENTRYP PFNGLXUSEXFONTPROC)(Font font, int first, int count, int list);
+GLAPI PFNGLXUSEXFONTPROC glad_glXUseXFont;
+#define glXUseXFont glad_glXUseXFont
+#endif
+#ifndef GLX_VERSION_1_1
+#define GLX_VERSION_1_1 1
+GLAPI int GLAD_GLX_VERSION_1_1;
+typedef const char * (APIENTRYP PFNGLXQUERYEXTENSIONSSTRINGPROC)(Display *dpy, int screen);
+GLAPI PFNGLXQUERYEXTENSIONSSTRINGPROC glad_glXQueryExtensionsString;
+#define glXQueryExtensionsString glad_glXQueryExtensionsString
+typedef const char * (APIENTRYP PFNGLXQUERYSERVERSTRINGPROC)(Display *dpy, int screen, int name);
+GLAPI PFNGLXQUERYSERVERSTRINGPROC glad_glXQueryServerString;
+#define glXQueryServerString glad_glXQueryServerString
+typedef const char * (APIENTRYP PFNGLXGETCLIENTSTRINGPROC)(Display *dpy, int name);
+GLAPI PFNGLXGETCLIENTSTRINGPROC glad_glXGetClientString;
+#define glXGetClientString glad_glXGetClientString
+#endif
+#ifndef GLX_VERSION_1_2
+#define GLX_VERSION_1_2 1
+GLAPI int GLAD_GLX_VERSION_1_2;
+typedef Display * (APIENTRYP PFNGLXGETCURRENTDISPLAYPROC)(void);
+GLAPI PFNGLXGETCURRENTDISPLAYPROC glad_glXGetCurrentDisplay;
+#define glXGetCurrentDisplay glad_glXGetCurrentDisplay
+#endif
+#ifndef GLX_VERSION_1_3
+#define GLX_VERSION_1_3 1
+GLAPI int GLAD_GLX_VERSION_1_3;
+typedef GLXFBConfig * (APIENTRYP PFNGLXGETFBCONFIGSPROC)(Display *dpy, int screen, int *nelements);
+GLAPI PFNGLXGETFBCONFIGSPROC glad_glXGetFBConfigs;
+#define glXGetFBConfigs glad_glXGetFBConfigs
+typedef GLXFBConfig * (APIENTRYP PFNGLXCHOOSEFBCONFIGPROC)(Display *dpy, int screen, const int *attrib_list, int *nelements);
+GLAPI PFNGLXCHOOSEFBCONFIGPROC glad_glXChooseFBConfig;
+#define glXChooseFBConfig glad_glXChooseFBConfig
+typedef int (APIENTRYP PFNGLXGETFBCONFIGATTRIBPROC)(Display *dpy, GLXFBConfig config, int attribute, int *value);
+GLAPI PFNGLXGETFBCONFIGATTRIBPROC glad_glXGetFBConfigAttrib;
+#define glXGetFBConfigAttrib glad_glXGetFBConfigAttrib
+typedef XVisualInfo * (APIENTRYP PFNGLXGETVISUALFROMFBCONFIGPROC)(Display *dpy, GLXFBConfig config);
+GLAPI PFNGLXGETVISUALFROMFBCONFIGPROC glad_glXGetVisualFromFBConfig;
+#define glXGetVisualFromFBConfig glad_glXGetVisualFromFBConfig
+typedef GLXWindow (APIENTRYP PFNGLXCREATEWINDOWPROC)(Display *dpy, GLXFBConfig config, Window win, const int *attrib_list);
+GLAPI PFNGLXCREATEWINDOWPROC glad_glXCreateWindow;
+#define glXCreateWindow glad_glXCreateWindow
+typedef void (APIENTRYP PFNGLXDESTROYWINDOWPROC)(Display *dpy, GLXWindow win);
+GLAPI PFNGLXDESTROYWINDOWPROC glad_glXDestroyWindow;
+#define glXDestroyWindow glad_glXDestroyWindow
+typedef GLXPixmap (APIENTRYP PFNGLXCREATEPIXMAPPROC)(Display *dpy, GLXFBConfig config, Pixmap pixmap, const int *attrib_list);
+GLAPI PFNGLXCREATEPIXMAPPROC glad_glXCreatePixmap;
+#define glXCreatePixmap glad_glXCreatePixmap
+typedef void (APIENTRYP PFNGLXDESTROYPIXMAPPROC)(Display *dpy, GLXPixmap pixmap);
+GLAPI PFNGLXDESTROYPIXMAPPROC glad_glXDestroyPixmap;
+#define glXDestroyPixmap glad_glXDestroyPixmap
+typedef GLXPbuffer (APIENTRYP PFNGLXCREATEPBUFFERPROC)(Display *dpy, GLXFBConfig config, const int *attrib_list);
+GLAPI PFNGLXCREATEPBUFFERPROC glad_glXCreatePbuffer;
+#define glXCreatePbuffer glad_glXCreatePbuffer
+typedef void (APIENTRYP PFNGLXDESTROYPBUFFERPROC)(Display *dpy, GLXPbuffer pbuf);
+GLAPI PFNGLXDESTROYPBUFFERPROC glad_glXDestroyPbuffer;
+#define glXDestroyPbuffer glad_glXDestroyPbuffer
+typedef void (APIENTRYP PFNGLXQUERYDRAWABLEPROC)(Display *dpy, GLXDrawable draw, int attribute, unsigned int *value);
+GLAPI PFNGLXQUERYDRAWABLEPROC glad_glXQueryDrawable;
+#define glXQueryDrawable glad_glXQueryDrawable
+typedef GLXContext (APIENTRYP PFNGLXCREATENEWCONTEXTPROC)(Display *dpy, GLXFBConfig config, int render_type, GLXContext share_list, Bool direct);
+GLAPI PFNGLXCREATENEWCONTEXTPROC glad_glXCreateNewContext;
+#define glXCreateNewContext glad_glXCreateNewContext
+typedef Bool (APIENTRYP PFNGLXMAKECONTEXTCURRENTPROC)(Display *dpy, GLXDrawable draw, GLXDrawable read, GLXContext ctx);
+GLAPI PFNGLXMAKECONTEXTCURRENTPROC glad_glXMakeContextCurrent;
+#define glXMakeContextCurrent glad_glXMakeContextCurrent
+typedef GLXDrawable (APIENTRYP PFNGLXGETCURRENTREADDRAWABLEPROC)(void);
+GLAPI PFNGLXGETCURRENTREADDRAWABLEPROC glad_glXGetCurrentReadDrawable;
+#define glXGetCurrentReadDrawable glad_glXGetCurrentReadDrawable
+typedef int (APIENTRYP PFNGLXQUERYCONTEXTPROC)(Display *dpy, GLXContext ctx, int attribute, int *value);
+GLAPI PFNGLXQUERYCONTEXTPROC glad_glXQueryContext;
+#define glXQueryContext glad_glXQueryContext
+typedef void (APIENTRYP PFNGLXSELECTEVENTPROC)(Display *dpy, GLXDrawable draw, unsigned long event_mask);
+GLAPI PFNGLXSELECTEVENTPROC glad_glXSelectEvent;
+#define glXSelectEvent glad_glXSelectEvent
+typedef void (APIENTRYP PFNGLXGETSELECTEDEVENTPROC)(Display *dpy, GLXDrawable draw, unsigned long *event_mask);
+GLAPI PFNGLXGETSELECTEDEVENTPROC glad_glXGetSelectedEvent;
+#define glXGetSelectedEvent glad_glXGetSelectedEvent
+#endif
+#ifndef GLX_VERSION_1_4
+#define GLX_VERSION_1_4 1
+GLAPI int GLAD_GLX_VERSION_1_4;
+typedef __GLXextFuncPtr (APIENTRYP PFNGLXGETPROCADDRESSPROC)(const GLubyte *procName);
+GLAPI PFNGLXGETPROCADDRESSPROC glad_glXGetProcAddress;
+#define glXGetProcAddress glad_glXGetProcAddress
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

inc/gui/cursor.h

@@ -21,6 +21,7 @@
 #define __GUI_CURSOR_H__
 
 typedef struct Texture Texture;
+typedef struct IonDrawable IonDrawable;
 
 /**
  * @addtogroup gui
@@ -29,12 +30,12 @@ typedef struct Texture Texture;
  */
 
 /** Times to rotate per second, if rotate is on. */
-#define CURSOR_RPM 80
+#define CURSOR_RPM 2
 
 /**
  * A drawable cursor, as part of a Skin.
  */
-typedef struct Cursor
+typedef struct IonCursor
 {
   /** Whether the cursor should expand when clicked. */
   int             expand;
@@ -45,15 +46,15 @@ typedef struct Cursor
   /** Last rotation angle. */
   float           last_angle;
 
-  Texture *       cursor;
-  Texture *       cursor_middle;
-  Texture *       cursor_smoke;
-  Texture *       cursor_trail;
-} Cursor;
+  IonDrawable *      cursor;
+  IonDrawable *      cursor_middle;
+  IonDrawable *      cursor_smoke;
+  IonDrawable *      cursor_trail;
+} IonCursor;
 
 void
 cursor_draw (
-  Cursor * self);
+  IonCursor * self);
 
 /**
  * @}

inc/gui/drawable.h

@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2019 Alexandros Theodotou <alex at zrythm dot org>
+ *
+ * This file is part of Ion
+ *
+ * Ion is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Ion is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Affero Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \file
+ *
+ * Drawable object.
+ */
+
+#ifndef __GUI_DRAWABLE_H__
+#define __GUI_DRAWABLE_H__
+
+#include "gui/shader_manager.h"
+#include "math/vector.h"
+
+typedef struct Texture Texture;
+
+/**
+ * @addtogroup gui
+ *
+ * @{
+ */
+
+/**
+ * Drawable element.
+ */
+typedef struct IonDrawable
+{
+  /** Shader to use. */
+  ShaderType    shader_type;
+
+  /** Texture to use. */
+  Texture *     texture;
+
+  /**
+   * Size of the drawable, independent of the
+   * texture.
+   *
+   * The texture will be stretched to this.
+   */
+  Vector2f      size;
+
+  /** GL vertex array object. */
+  unsigned int  vao;
+
+  /** Vertices. */
+  unsigned int  vbo;
+
+  /** Texture coordinates. */
+  unsigned int  tbo;
+
+  /** Indices (elements). */
+  unsigned int  ebo;
+
+  /** How many vertices we need to draw. */
+  unsigned int  draw_count;
+
+  /** Set to 1 if the position is expected to
+   * change often. */
+  int           dynamic_positions;
+
+  /** Angle to rotate by or 0. */
+  float         angle;
+
+  /** Position to start drawing at. */
+  Vector2f      position;
+
+  /** Quad. */
+  Vector2f      vectors[4];
+
+  /** Texture coordinates for each vector. */
+  Vector2f      tex_coords[4];
+
+  /** Indices. */
+  unsigned int  indices[6];
+} IonDrawable;
+
+IonDrawable *
+drawable_new_with_texture (
+  ShaderType shader_type,
+  Texture *  texture,
+  Vector2f * position,
+  Vector2f * size);
+
+void
+drawable_update_position (
+  IonDrawable * self,
+  Vector2f *    position,
+  Vector2f *    size);
+
+void
+drawable_draw (
+  IonDrawable * self);
+
+void
+drawable_free (
+  IonDrawable * self);
+
+/**
+ * @}
+ */
+
+#endif

inc/gui/gsl/unchanged.frag

@@ -1,7 +0,0 @@
-#version 130
-
-void main()
-{
-  //gl_FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);
-  gl_FragColor = gl_Color;
-}

inc/gui/gsl/unchanged.vert

@@ -1,8 +0,0 @@
-#version 130
-
-void main()
-{
-  gl_Position = ftransform();
-  gl_FrontColor = gl_Color;
-  //gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
-}

inc/gui/main_menu.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2019 Alexandros Theodotou <alex at zrythm dot org>
+ *
+ * This file is part of Ion
+ *
+ * Ion is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Ion is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Affero Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GUI_MAIN_MENU_H__
+#define __GUI_MAIN_MENU_H__
+
+typedef struct Texture Texture;
+
+/**
+ * @addtogroup gui
+ *
+ * @{
+ */
+
+/**
+ * A drawable logo, as part of a Skin.
+ */
+typedef struct MainMenu
+{
+} MainMenu;
+
+void
+main_menu_draw (
+  MainMenu * self);
+
+/**
+ * @}
+ */
+
+#endif

inc/gui/shader.h

@@ -34,10 +34,13 @@
 
 typedef struct Shader
 {
+  unsigned int    vertex_shader_id;
+  unsigned int    fragment_shader_id;
+
   /**
    * OpenGL shader program ID.
    *
-   * For now, each program has 1 vertex shader and 1
+   * Each program has 1 vertex shader and 1
    * fragment shader.
    */
   unsigned int    program_id;
@@ -47,6 +50,14 @@ Shader *
 shader_new (
   const char * filepath);
 
+void
+shader_bind (
+  Shader * self);
+
+void
+shader_free (
+  Shader * self);
+
 /**
  * @}
  */

inc/gui/shader_manager.h

@@ -34,10 +34,15 @@ typedef struct Shader Shader;
  * @{
  */
 
+typedef enum ShaderType
+{
+  SHADER_TYPE_UNCHANGED,
+  NUM_SHADER_TYPES,
+} ShaderType;
+
 typedef struct ShaderManager
 {
-  Shader *      rotate_2d_shader;
-  Shader *      unchanged_shader;
+  Shader *      shaders[NUM_SHADER_TYPES];
 } ShaderManager;
 
 ShaderManager *

inc/gui/skin.h

@@ -31,6 +31,7 @@
 
 typedef struct AudioClip AudioClip;
 typedef struct Texture Texture;
+typedef struct IonDrawable IonDrawable;
 
 /**
  * @addtogroup skinning
@@ -61,10 +62,10 @@ typedef struct Skin
   IonRGBA         combo_colors[16];
   int             num_combo_colors;
 
-  Cursor          cursor;
+  IonCursor          cursor;
 
-  Texture *       logo;
-  Texture *       menu_bg;
+  IonDrawable *      logo;
+  IonDrawable *      menu_bg;
   Texture *       selection_mod_autoplay;
   Texture *       selection_mod_cinema;
   Texture *       selection_mod_doubletime;

inc/gui/texture.h

@@ -84,6 +84,13 @@ texture_new_from_raw_data (
   unsigned int    height,
   unsigned char * pixels);
 
+/**
+ * Binds the texture to be used.
+ */
+void
+texture_bind (
+  Texture * self);
+
 /**
  * Generate a texture in the backend for the given
  * file.

inc/math/vector.h

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2019 Alexandros Theodotou <alex at zrythm dot org>
+ *
+ * This file is part of Ion
+ *
+ * Ion is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Ion is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Affero Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \file
+ *
+ * Vectors.
+ */
+
+#ifndef __MATH_VECTOR_H__
+#define __MATH_VECTOR_H__
+
+/**
+ * @addtogroup math
+ *
+ * @{
+ */
+
+/**
+ * Vector.
+ */
+typedef struct Vector2f
+{
+  float x;
+  float y;
+} Vector2f;
+
+typedef struct Vector3f
+{
+  float x;
+  float y;
+  float z;
+} Vector3f;
+
+/**
+ * @}
+ */
+
+#endif

inc/utils/math.h

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2018-2019 Alexandros Theodotou <alex at zrythm dot org>
+ *
+ * This file is part of Zrythm
+ *
+ * Zrythm is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Zrythm is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Zrythm.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __UTILS_MATH_H__
+#define __UTILS_MATH_H__
+
+#include <float.h>
+#include <math.h>
+#include <stdint.h>
+
+#define MATH_FLOATS_EQUAL(a,b,epsilon) \
+  (fabsf (a - b) < epsilon)
+
+/**
+ * Checks if 2 floating points are equal.
+ *
+ * @param epsilon The allowed differene.
+ */
+static inline int
+math_floats_equal (
+  const float a,
+  const float b,
+  const float epsilon)
+{
+  return fabsf (a - b) < epsilon;
+}
+
+/**
+ * Checks if 2 doubles are equal.
+ *
+ * @param epsilon The allowed differene.
+ */
+static inline int
+math_doubles_equal (
+  const double a,
+  const double b,
+  const double epsilon)
+{
+  return fabs (a - b) < epsilon;
+}
+
+#endif

meson.build

@@ -26,6 +26,36 @@ project(
     ],
   )
 
+prefix = get_option ('prefix')
+bindir = join_paths (prefix, get_option('bindir'))
+datadir = join_paths (prefix, get_option('datadir'))
+iondatadir = join_paths (datadir, 'ion')
+glsldir = join_paths (datadir, 'glsl')
+
+cdata = configuration_data ()
+cdata.set_quoted (
+  'PACKAGE_VERSION',
+  '@VCS_TAG@')
+cdata.set_quoted (
+  'COMPILER',
+  meson.get_compiler('c').get_id())
+cdata.set_quoted (
+  'PREFIX', prefix)
+cdata.set_quoted (
+  'COMPILER_VERSION',
+  meson.get_compiler('c').version())
+cdata.set_quoted (
+  'CONFIGURE_DATADIR',
+  datadir)
+cdata.set_quoted (
+  'GLSL_DIR', glsldir)
+cdata.set (
+  'MESON_SOURCE_ROOT',
+  meson.source_root ())
+cdata.set (
+  'MESON_BUILD_ROOT',
+  meson.build_root ())
+
 cc = meson.get_compiler ('c')
 
 root_inc = include_directories ('.')
@@ -54,9 +84,39 @@ ion_deps = [
   dependency('glfw3'),
   dependency('gl'),
   dependency('pangocairo'),
-  dependency('glew'),
+  dependency('x11'),
   cc.find_library('dl', required: false),
   cc.find_library('SOIL'),
 ]
 
+# create config.h
+tmp_h = configure_file (
+  output: 'tmp.h',
+  configuration: cdata,
+  )
+config_h_vcs = vcs_tag (
+  input: tmp_h,
+  output: 'config.h',
+  )
+config_h_dep = declare_dependency (
+  sources: config_h_vcs,
+  )
+ion_deps += config_h_dep
+
+subdir ('data')
 subdir ('src')
+
+summary = [
+  '',
+  '------',
+  'Ion @0@'.format(meson.project_version()),
+  '',
+  '  Build type: @0@'.format(
+    get_option('buildtype')),
+  '  Directories:',
+  '            prefix: @0@'.format(prefix),
+  '           datadir: @0@'.format(datadir),
+  '------',
+  ''
+]
+message('\n'.join(summary))

src/game/ion_world.c

@@ -23,10 +23,12 @@
 #include <glib.h>
 
 #include "game/ion_world.h"
-#include "game/skinning/skin_manager.h"
-#include "game/skinning/skin.h"
+#include "gui/drawable.h"
 #include "gui/gl.h"
+#include "gui/main_menu.h"
 #include "gui/shader_manager.h"
+#include "gui/skin_manager.h"
+#include "gui/skin.h"
 #include "gui/texture.h"
 #include "utils/pango.h"
 
@@ -35,13 +37,17 @@
  */
 IonWorld *
 ion_world_new (
-  GLFWwindow * window)
+  GLFWwindow * window,
+  int          monitor_width,
+  int          monitor_height)
 {
   IonWorld * self = calloc (1, sizeof (IonWorld));
 
   ION_WORLD = self;
 
   self->window = window;
+  self->monitor_width = monitor_width;
+  self->monitor_height = monitor_height;
   self->screen = ION_WORLD_SCREEN_MAIN_MENU;
   self->skins_dir =
     g_build_filename (