readme: wording, add icon, add donate.md link [skip ci]

Documentation/donate.md

@@ -0,0 +1,24 @@
+# Developers donation page
+
+On this page you can find links where you can support each developer individually, who has provided public sponsorship information.
+
+### [a1batross](https://github.com/a1batross)
+
+* Initial Xash3D SDL2/Linux port author, Xash3D FWGS engine maintainer, creator of non-commercial Flying With Gauss organization.
+* Boosty page: https://boosty.to/a1ba
+
+### [nekonomicon](https://github.com/nekonomicon)
+
+* [hlsdk-portable](https://github.com/FWGS/hlsdk-portable), [mdldec](../utils/mdldec), [opensource-mods.md](opensource-mods.md) maintainer and Xash3D FWGS [contributor](https://github.com/FWGS/xash3d-fwgs/commits?author=nekonomicon) (*BSD/clang port, PNG support, etc).
+* Boosty page: https://boosty.to/nekonomicon
+
+### [Velaron](https://github.com/Velaron)
+* [cs16-client](https://github.com/Velaron/cs16-client) & [tf15-client](https://github.com/Velaron/tf15-client) maintainer and Xash3D FWGS [contributor](https://github.com/FWGS/xash3d-fwgs/commits?author=Velaron) (Android port, voice chat, etc).
+* BuyMeACoffee page: https://www.buymeacoffee.com/velaron
+
+### [SNMetamorph](https://github.com/SNMetamorph)
+* [PrimeXT](https://github.com/SNMetamorph/PrimeXT) & [GoldSrc Monitor](https://github.com/SNMetamorph/goldsrc-monitor) maintainer and Xash3D FWGS [contributor](https://github.com/FWGS/xash3d-fwgs/commits?author=SNMetamorph) (Windows port, voice chat, etc).
+* BTC: `16GAzK3qei5AwBW7sggXp3yNcFHBtdpxXj`
+* ETH (ERC20): `0xb580eeca9756e3881f9d6d026e28db28eb72a383`
+* USDT (ERC20): `0xb580eeca9756e3881f9d6d026e28db28eb72a383`
+* USDC (ERC20): `0xb580eeca9756e3881f9d6d026e28db28eb72a383`

README.md

@@ -1,33 +1,27 @@
-# Xash3D FWGS Engine
+# Xash3D FWGS Engine <img align="right" width="128" height="128" src="https://github.com/FWGS/xash3d-fwgs/raw/master/game_launch/icon-xash-material.png" alt="Xash3D FWGS icon" />
 [![GitHub Actions Status](https://github.com/FWGS/xash3d-fwgs/actions/workflows/c-cpp.yml/badge.svg)](https://github.com/FWGS/xash3d-fwgs/actions/workflows/c-cpp.yml) [![FreeBSD Build Status](https://img.shields.io/cirrus/github/FWGS/xash3d-fwgs?label=freebsd%20build)](https://cirrus-ci.com/github/FWGS/xash3d-fwgs) [![Discord Server](https://img.shields.io/discord/355697768582610945.svg)](http://fwgsdiscord.mentality.rip/) \
-[![Download Stable](https://img.shields.io/badge/download-stable-yellow)](https://github.com/FWGS/xash3d-fwgs/releases/latest) [![Download Testing](https://img.shields.io/badge/downloads-testing-orange)](https://github.com/FWGS/xash3d-fwgs/releases/tag/continuous) 
+[![Download Stable](https://img.shields.io/badge/download-stable-yellow)](https://github.com/FWGS/xash3d-fwgs/releases/latest) [![Download Testing](https://img.shields.io/badge/downloads-testing-orange)](https://github.com/FWGS/xash3d-fwgs/releases/tag/continuous)
 
-Xash3D FWGS is a fork of Xash3D Engine by Unkle Mike with extended features and crossplatform.
+Xash3D FWGS is a game engine, aimed to provide compatibility with Half-Life Engine and extend it, as well as to give game developers well known workflow.
 
-```
-Xash3D is a game engine, aimed to provide compatibility with Half-Life Engine, 
-as well as to give game developers well known workflow and extend it.
-Read more about Xash3D on ModDB: https://www.moddb.com/engines/xash3d-engine
-```
+Xash3D FWGS is a heavily modified fork of an original [Xash3D Engine](https://www.moddb.com/engines/xash3d-engine) by Unkle Mike.
+
+## Donate
+[![Donate to FWGS button](https://img.shields.io/badge/Donate_to_FWGS-%3C3-magenta)](Documentation/donate.md) \
+If you like Xash3D FWGS, consider supporting individual engine maintainers. By supporting us, you help to continue developing this game engine further. The sponsorship links are available in [documentation](Documentation/donate.md).
 
 ## Fork features
-* HLSDK 2.4 support.
-* Crossplatform: supported x86 and ARM on Windows/Linux/BSD/Android. ([see docs for more info](Documentation/ports.md))
-* Modern compilers support: say no more to MSVC6.
-* Better multiplayer support: multiple master servers, headless dedicated server.
-* Mobility API: allows better game integration on mobile devices(vibration, touch controls)
-* Different input methods: touch, gamepad and classic mouse & keyboard.
+* Steam Half-Life (HLSDK 2.4) support.
+* Crossplatform and modern compilers support: supports Windows, Linux, BSD & Android on x86 & ARM and [many more](Documentation/ports.md).
+* Better multiplayer support: multiple master servers, headless dedicated server, voice chat and IPv6 support.
+* Multiple renderers support: OpenGL, GLESv1, GLESv2 and Software.
+* Advanced virtual filesystem: `.pk3` and `.pk3dir` support, compatibility with GoldSrc FS module, fast case-insensitivity emulation for crossplatform.
+* Mobility API: better game integration on mobile devices (vibration, touch controls)
+* Different input methods: touch and gamepad in addition to mouse & keyboard.
 * TrueType font rendering, as a part of mainui_cpp.
-* Multiple renderers support: OpenGL, GLESv1, GLESv2, Software.
-* Voice support.
-* External filesystem module like in GoldSrc engine.
-* External vgui support module.
-* PNG image format support.
-* A set of small improvements, without broken compatibility.
-
-## Planned fork features
-* Virtual Reality support and game API.
-* Vulkan renderer.
+* External VGUI support module.
+* PNG & KTX2 image format support.
+* [A set of small improvements](Documentation/), without broken compatibility.
 
 ## Installation & Running
 0) Get Xash3D FWGS binaries: you can use [testing](https://github.com/FWGS/xash3d-fwgs/releases/tag/continuous) build or you can compile engine from source code.

common/xash3d_types.h

@@ -181,6 +181,7 @@ typedef struct dll_info_s
 } dll_info_t;
 
 typedef void (*setpair_t)( const char *key, const void *value, const void *buffer, void *numpairs );
+typedef void *(*pfnCreateInterface_t)( const char *, int * );
 
 // config strings are a general means of communication from
 // the server to all connected clients.

engine/client/cl_gameui.c

@@ -982,7 +982,7 @@ pfnCheckGameDll
 */
 int GAME_EXPORT pfnCheckGameDll( void )
 {
-#if XASH_INTERNAL_GAMELIBS
+#ifdef XASH_INTERNAL_GAMELIBS
 	return true;
 #else
 	string dllpath;

engine/client/cl_mobile.c

@@ -87,15 +87,6 @@ static int pfnDrawScaledCharacter( int x, int y, int number, int r, int g, int b
 	return CL_DrawCharacter( x, y, number, color, &g_scaled_font, flags );
 }
 
-static void *pfnGetNativeObject( const char *obj )
-{
-	if( !obj )
-		return NULL;
-
-	// Backend should consider that obj is case-sensitive
-	return Platform_GetNativeObject( obj );
-}
-
 static void pfnTouch_HideButtons( const char *name, byte state )
 {
 	Touch_HideButtons( name, state, true );
@@ -124,7 +115,7 @@ static mobile_engfuncs_t gpMobileEngfuncs =
 	Touch_ResetDefaultButtons,
 	pfnDrawScaledCharacter,
 	Sys_Warn,
-	pfnGetNativeObject,
+	Sys_GetNativeObject,
 	ID_SetCustomClientID,
 	pfnParseFileSafe
 };

engine/client/ref_common.c

@@ -16,6 +16,7 @@ CVAR_DEFINE_AUTO( gl_msaa_samples, "0", FCVAR_GLCONFIG, "samples number for mult
 CVAR_DEFINE_AUTO( gl_clear, "0", FCVAR_ARCHIVE, "clearing screen after each frame" );
 CVAR_DEFINE_AUTO( r_showtree, "0", FCVAR_ARCHIVE, "build the graph of visible BSP tree" );
 static CVAR_DEFINE_AUTO( r_refdll, "", FCVAR_RENDERINFO, "choose renderer implementation, if supported" );
+static CVAR_DEFINE_AUTO( r_refdll_loaded, "", FCVAR_READ_ONLY, "currently loaded renderer" );
 
 void R_GetTextureParms( int *w, int *h, int texnum )
 {
@@ -519,6 +520,7 @@ static qboolean R_LoadRenderer( const char *refopt )
 		return false;
 	}
 
+	Cvar_FullSet( "r_refdll_loaded", refopt, FCVAR_READ_ONLY );
 	Con_Reportf( "Renderer %s initialized\n", refdll );
 
 	return true;
@@ -610,6 +612,7 @@ qboolean R_Init( void )
 	Cvar_RegisterVariable( &gl_clear );
 	Cvar_RegisterVariable( &r_showtree );
 	Cvar_RegisterVariable( &r_refdll );
+	Cvar_RegisterVariable( &r_refdll_loaded );
 
 	// cvars that are expected to exist
 	Cvar_Get( "r_speeds", "0", FCVAR_ARCHIVE, "shows renderer speeds" );

engine/common/common.h

@@ -381,6 +381,7 @@ typedef void (*xcommand_t)( void );
 qboolean FS_LoadProgs( void );
 void FS_Init( void );
 void FS_Shutdown( void );
+void *FS_GetNativeObject( const char *obj );
 
 //
 // cmd.c

engine/common/filesystem_engine.c

@@ -23,8 +23,17 @@ GNU General Public License for more details.
 fs_api_t g_fsapi;
 fs_globals_t *FI;
 
+static pfnCreateInterface_t fs_pfnCreateInterface;
 static HINSTANCE fs_hInstance;
 
+void *FS_GetNativeObject( const char *obj )
+{
+	if( fs_pfnCreateInterface )
+		return fs_pfnCreateInterface( obj, NULL );
+
+	return NULL;
+}
+
 static void FS_Rescan_f( void )
 {
 	FS_Rescan();
@@ -53,7 +62,7 @@ static fs_interface_t fs_memfuncs =
 	_Mem_Realloc,
 	_Mem_Free,
 
-	Platform_GetNativeObject,
+	Sys_GetNativeObject,
 };
 
 static void FS_UnloadProgs( void )
@@ -98,6 +107,13 @@ qboolean FS_LoadProgs( void )
 		return false;
 	}
 
+	if( !( fs_pfnCreateInterface = (pfnCreateInterface_t)COM_GetProcAddress( fs_hInstance, "CreateInterface" )))
+	{
+		FS_UnloadProgs();
+		Host_Error( "FS_LoadProgs: can't find CreateInterface entry point in %s\n", name );
+		return false;
+	}
+
 	Con_DPrintf( "FS_LoadProgs: filesystem_stdio successfully loaded\n" );
 
 	return true;

engine/common/host.c

@@ -1020,7 +1020,7 @@ void Host_InitCommon( int argc, char **argv, const char *progname, qboolean bCha
 #if TARGET_OS_IOS
 		Q_strncpy( host.rootdir, IOS_GetDocsDir(), sizeof( host.rootdir ));
 #elif XASH_ANDROID && XASH_SDL
-		Q_strncpy( host.rootdir, SDL_AndroidGetExternalStoragePath, sizeof( host.rootdir ));
+		Q_strncpy( host.rootdir, SDL_AndroidGetExternalStoragePath(), sizeof( host.rootdir ));
 #elif XASH_PSVITA
 		if ( !PSVita_GetBasePath( host.rootdir, sizeof( host.rootdir )))
 		{

engine/common/mod_bmodel.c

@@ -2012,6 +2012,20 @@ static void Mod_LoadMarkSurfaces( model_t *mod, dbspmodel_t *bmod )
 	}
 }
 
+static qboolean Mod_LooksLikeWaterTexture( const char *name )
+{
+	if(( name[0] == '*' && Q_stricmp( name, REF_DEFAULT_TEXTURE )) || name[0] == '!' )
+		return true;
+
+	if( !Host_IsQuakeCompatible( ))
+	{
+		if( !Q_strncmp( name, "water", 5 ) || !Q_strnicmp( name, "laser", 5 ))
+			return true;
+	}
+
+	return false;
+}
+
 static void Mod_LoadTextureData( model_t *mod, dbspmodel_t *bmod, int textureIndex )
 {
 #if !XASH_DEDICATED
@@ -2032,6 +2046,10 @@ static void Mod_LoadTextureData( model_t *mod, dbspmodel_t *bmod, int textureInd
 	if( FBitSet( host.features, ENGINE_IMPROVED_LINETRACE ) && mipTex->name[0] == '{' )
 		SetBits( txFlags, TF_KEEP_SOURCE ); // Paranoia2 texture alpha-tracing
 
+	// check if this is water to keep the source texture and expand it to RGBA (so ripple effect works)
+	if( Mod_LooksLikeWaterTexture( mipTex->name ))
+		SetBits( txFlags, TF_KEEP_SOURCE | TF_EXPAND_SOURCE );
+
 	usesCustomPalette = Mod_CalcMipTexUsesCustomPalette( mod, bmod, textureIndex );
 
 	// check for multi-layered sky texture (quake1 specific)
@@ -2449,15 +2467,9 @@ static void Mod_LoadSurfaces( model_t *mod, dbspmodel_t *bmod )
 		if( !Q_strncmp( tex->name, "sky", 3 ))
 			SetBits( out->flags, SURF_DRAWSKY );
 
-		if(( tex->name[0] == '*' && Q_stricmp( tex->name, REF_DEFAULT_TEXTURE )) || tex->name[0] == '!' )
+		if( Mod_LooksLikeWaterTexture( tex->name ))
 			SetBits( out->flags, SURF_DRAWTURB );
 
-		if( !Host_IsQuakeCompatible( ))
-		{
-			if( !Q_strncmp( tex->name, "water", 5 ) || !Q_strnicmp( tex->name, "laser", 5 ))
-				SetBits( out->flags, SURF_DRAWTURB );
-		}
-
 		if( !Q_strncmp( tex->name, "scroll", 6 ))
 			SetBits( out->flags, SURF_CONVEYOR );
 

engine/common/system.c

@@ -649,3 +649,31 @@ qboolean Sys_NewInstance( const char *gamedir )
 
 	return false;
 }
+
+
+/*
+==================
+Sys_GetNativeObject
+
+Get platform-specific native object
+==================
+*/
+void *Sys_GetNativeObject( const char *obj )
+{
+	void *ptr;
+
+	if( !COM_CheckString( obj ))
+		return NULL;
+
+	ptr = FS_GetNativeObject( obj );
+
+	if( ptr )
+		return ptr;
+
+	// Backend should consider that obj is case-sensitive
+#if XASH_ANDROID
+	ptr = Android_GetNativeObject( obj );
+#endif // XASH_ANDROID
+
+	return ptr;
+}

engine/common/system.h

@@ -70,6 +70,7 @@ void Sys_InitLog( void );
 void Sys_CloseLog( void );
 void Sys_Quit( void ) NORETURN;
 qboolean Sys_NewInstance( const char *gamedir );
+void *Sys_GetNativeObject( const char *obj );
 
 //
 // sys_con.c

engine/platform/platform.h

@@ -139,17 +139,6 @@ static inline void Platform_Shutdown( void )
 #endif
 }
 
-static inline void *Platform_GetNativeObject( const char *name )
-{
-	void *ptr = NULL;
-
-#if XASH_ANDROID
-	ptr = Android_GetNativeObject( name );
-#endif
-
-	return ptr;
-}
-
 /*
 ==============================================================================
 
@@ -158,7 +147,6 @@ static inline void *Platform_GetNativeObject( const char *name )
 ==============================================================================
 */
 void Platform_Vibrate( float life, char flags );
-void*Platform_GetNativeObject( const char *name );
 
 /*
 ==============================================================================

filesystem/VFileSystem009.h

@@ -150,6 +150,4 @@ public:
 	virtual void AddSearchPathNoWrite(const char *, const char *) = 0; /* linkage=_ZN11IFileSystem20AddSearchPathNoWriteEPKcS1_ */
 };
 
-#define FILESYSTEM_INTERFACE_VERSION "VFileSystem009" // never change this!
-
 #endif // VFILESYSTEM009_H

filesystem/filesystem.c

@@ -1386,7 +1386,7 @@ static void _Sys_Error( const char *fmt, ... )
 	exit( 1 );
 }
 
-static void *_Platform_GetNativeObject_stub( const char *object )
+static void *Sys_GetNativeObject_stub( const char *object )
 {
 	return NULL;
 }
@@ -2841,7 +2841,7 @@ fs_interface_t g_engfuncs =
 	_Mem_Alloc,
 	_Mem_Realloc,
 	_Mem_Free,
-	_Platform_GetNativeObject_stub
+	Sys_GetNativeObject_stub
 };
 
 static qboolean FS_InitInterface( int version, fs_interface_t *engfuncs )
@@ -2883,9 +2883,9 @@ static qboolean FS_InitInterface( int version, fs_interface_t *engfuncs )
 		Con_Reportf( "filesystem_stdio: custom memory allocation functions found\n" );
 	}
 
-	if( engfuncs->_Platform_GetNativeObject )
+	if( engfuncs->_Sys_GetNativeObject )
 	{
-		g_engfuncs._Platform_GetNativeObject = engfuncs->_Platform_GetNativeObject;
+		g_engfuncs._Sys_GetNativeObject = engfuncs->_Sys_GetNativeObject;
 		Con_Reportf( "filesystem_stdio: custom platform-specific functions found\n" );
 	}
 

filesystem/filesystem.h

@@ -32,7 +32,8 @@ extern "C"
 #endif // __cplusplus
 
 #define FS_API_VERSION 2 // not stable yet!
-#define FS_API_CREATEINTERFACE_TAG "XashFileSystem002" // follow FS_API_VERSION!!!
+#define FS_API_CREATEINTERFACE_TAG   "XashFileSystem002" // follow FS_API_VERSION!!!
+#define FILESYSTEM_INTERFACE_VERSION "VFileSystem009" // never change this!
 
 // search path flags
 enum
@@ -210,7 +211,7 @@ typedef struct fs_interface_t
 	void  (*_Mem_Free)( void *data, const char *filename, int fileline );
 
 	// platform
-	void *(*_Platform_GetNativeObject)( const char *object );
+	void *(*_Sys_GetNativeObject)( const char *object );
 } fs_interface_t;
 
 typedef int (*FSAPI)( int version, fs_api_t *api, fs_globals_t **globals, fs_interface_t *interface );

filesystem/filesystem_internal.h

@@ -127,7 +127,7 @@ extern const fs_archive_t g_archives[];
 #define Con_DPrintf (*g_engfuncs._Con_DPrintf)
 #define Con_Reportf (*g_engfuncs._Con_Reportf)
 #define Sys_Error   (*g_engfuncs._Sys_Error)
-#define Platform_GetNativeObject (*g_engfuncs._Platform_GetNativeObject)
+#define Sys_GetNativeObject (*g_engfuncs._Sys_GetNativeObject)
 
 //
 // filesystem.c

filesystem/tests/interface.cpp

@@ -18,7 +18,6 @@ typedef void *HMODULE;
 
 HMODULE g_hModule;
 FSAPI g_pfnGetFSAPI;
-typedef void *(*pfnCreateInterface_t)( const char *, int * );
 pfnCreateInterface_t g_pfnCreateInterface;
 fs_api_t g_fs;
 fs_globals_t *g_nullglobals;

ref/gl/gl_image.c

@@ -342,6 +342,8 @@ void R_SetTextureParameters( void )
 	// change all the existing mipmapped texture objects
 	for( i = 0; i < gl_numTextures; i++ )
 		GL_UpdateTextureParams( i );
+
+	R_UpdateRippleTexParams();
 }
 
 /*
@@ -2317,6 +2319,7 @@ void R_InitImages( void )
 	// validate cvars
 	R_SetTextureParameters();
 	GL_CreateInternalTextures();
+	R_InitRipples();
 
 	gEngfuncs.Cmd_AddCommand( "texturelist", R_TextureList_f, "display loaded textures list" );
 }

ref/gl/gl_local.h

@@ -489,6 +489,11 @@ void R_ClearSkyBox( void );
 void R_DrawSkyBox( void );
 void R_DrawClouds( void );
 void EmitWaterPolys( msurface_t *warp, qboolean reverse );
+void R_InitRipples( void );
+void R_ResetRipples( void );
+void R_AnimateRipples( void );
+void R_UpdateRippleTexParams( void );
+void R_UploadRipples( texture_t *image );
 
 //
 // gl_vgui.c
@@ -750,6 +755,9 @@ extern convar_t	r_vbo;
 extern convar_t	r_vbo_dlightmode;
 extern convar_t r_studio_sort_textures;
 extern convar_t r_studio_drawelements;
+extern convar_t r_ripple;
+extern convar_t r_ripple_updatetime;
+extern convar_t r_ripple_spawntime;
 
 //
 // engine shared convars

ref/gl/gl_opengl.c

@@ -30,6 +30,10 @@ CVAR_DEFINE_AUTO( r_traceglow, "0", FCVAR_GLCONFIG, "cull flares behind models"
 CVAR_DEFINE_AUTO( gl_round_down, "2", FCVAR_GLCONFIG|FCVAR_READ_ONLY, "round texture sizes to nearest POT value" );
 CVAR_DEFINE( r_vbo, "gl_vbo", "0", FCVAR_ARCHIVE, "draw world using VBO (known to be glitchy)" );
 CVAR_DEFINE( r_vbo_dlightmode, "gl_vbo_dlightmode", "1", FCVAR_ARCHIVE, "vbo dlight rendering mode (0-1)" );
+CVAR_DEFINE_AUTO( r_ripple, "0", FCVAR_GLCONFIG, "enable software-like water texture ripple simulation" );
+CVAR_DEFINE_AUTO( r_ripple_updatetime, "0.05", FCVAR_GLCONFIG, "how fast ripple simulation is" );
+CVAR_DEFINE_AUTO( r_ripple_spawntime, "0.1", FCVAR_GLCONFIG, "how fast new ripples spawn" );
+
 
 DEFINE_ENGINE_SHARED_CVAR_LIST()
 
@@ -1186,6 +1190,9 @@ void GL_InitCommands( void )
 	gEngfuncs.Cvar_RegisterVariable( &r_traceglow );
 	gEngfuncs.Cvar_RegisterVariable( &r_studio_sort_textures );
 	gEngfuncs.Cvar_RegisterVariable( &r_studio_drawelements );
+	gEngfuncs.Cvar_RegisterVariable( &r_ripple );
+	gEngfuncs.Cvar_RegisterVariable( &r_ripple_updatetime );
+	gEngfuncs.Cvar_RegisterVariable( &r_ripple_spawntime );
 
 	gEngfuncs.Cvar_RegisterVariable( &gl_extensions );
 	gEngfuncs.Cvar_RegisterVariable( &gl_texture_nearest );

ref/gl/gl_rmain.c

@@ -969,6 +969,8 @@ void R_RenderScene( void )
 
 	R_MarkLeaves();
 	R_DrawFog ();
+	if( RI.drawWorld )
+		R_AnimateRipples();
 
 	R_CheckGLFog();
 	R_DrawWorld();

ref/gl/gl_rmisc.c

@@ -150,6 +150,7 @@ void R_NewMap( void )
 
 	GL_BuildLightmaps ();
 	R_GenerateVBO();
+	R_ResetRipples();
 
 	if( gEngfuncs.drawFuncs->R_NewMap != NULL )
 		gEngfuncs.drawFuncs->R_NewMap();

ref/gl/gl_rsurf.c

@@ -204,7 +204,7 @@ void GL_SetupFogColorForSurfaces( void )
 	vec3_t	fogColor;
 	float	factor, div;
 
-	if( !glState.isFogEnabled)
+	if( !glState.isFogEnabled )
 		return;
 
 	if( RI.currententity && RI.currententity->curstate.rendermode == kRenderTransTexture )
@@ -1135,14 +1135,15 @@ void R_RenderBrushPoly( msurface_t *fa, int cull_type )
 
 	t = R_TextureAnimation( fa );
 
-	GL_Bind( XASH_TEXTURE0, t->gl_texturenum );
-
 	if( FBitSet( fa->flags, SURF_DRAWTURB ))
 	{
+		R_UploadRipples( t );
+
 		// warp texture, no lightmaps
 		EmitWaterPolys( fa, (cull_type == CULL_BACKSIDE));
 		return;
 	}
+	else GL_Bind( XASH_TEXTURE0, t->gl_texturenum );
 
 	if( t->fb_texturenum )
 	{
@@ -1411,7 +1412,7 @@ void R_DrawWaterSurfaces( void )
 			continue;
 
 		// set modulate mode explicitly
-		GL_Bind( XASH_TEXTURE0, t->gl_texturenum );
+		R_UploadRipples( t );
 
 		for( ; s; s = s->texturechain )
 			EmitWaterPolys( s, false );

ref/gl/gl_warp.c

@@ -62,6 +62,29 @@ static float r_turbsin[] =
 #include "warpsin.h"
 };
 
+#define RIPPLES_CACHEWIDTH_BITS 7
+#define RIPPLES_CACHEWIDTH ( 1 << RIPPLES_CACHEWIDTH_BITS )
+#define RIPPLES_CACHEWIDTH_MASK (( RIPPLES_CACHEWIDTH ) - 1 )
+#define RIPPLES_TEXSIZE ( RIPPLES_CACHEWIDTH * RIPPLES_CACHEWIDTH )
+#define RIPPLES_TEXSIZE_MASK ( RIPPLES_TEXSIZE - 1 )
+
+STATIC_ASSERT( RIPPLES_TEXSIZE == 0x4000, "fix the algorithm to work with custom resolution" );
+
+static struct
+{
+	double time;
+	double oldtime;
+
+	short *curbuf, *oldbuf;
+	short buf[2][RIPPLES_TEXSIZE];
+	qboolean update;
+
+	uint32_t texture[RIPPLES_TEXSIZE];
+	int gl_texturenum;
+	int rippletexturenum;
+	float texturescale; // not all textures are 128x128, scale the texcoords down
+} g_ripple;
+
 static qboolean CheckSkybox( const char *name, char out[6][MAX_STRING] )
 {
 	const char	*skybox_ext[3] = { "dds", "tga", "bmp" };
@@ -799,10 +822,18 @@ void EmitWaterPolys( msurface_t *warp, qboolean reverse )
 			os = v[3];
 			ot = v[4];
 
-			s = os + r_turbsin[(int)((ot * 0.125f + gpGlobals->time) * TURBSCALE) & 255];
-			s *= ( 1.0f / SUBDIVIDE_SIZE );
+			if( !r_ripple.value )
+			{
+				s = os + r_turbsin[(int)((ot * 0.125f + gpGlobals->time) * TURBSCALE) & 255];
+				t = ot + r_turbsin[(int)((os * 0.125f + gpGlobals->time) * TURBSCALE) & 255];
+			}
+			else
+			{
+				s = os / g_ripple.texturescale;
+				t = ot / g_ripple.texturescale;
+			}
 
-			t = ot + r_turbsin[(int)((os * 0.125f + gpGlobals->time) * TURBSCALE) & 255];
+			s *= ( 1.0f / SUBDIVIDE_SIZE );
 			t *= ( 1.0f / SUBDIVIDE_SIZE );
 
 			pglTexCoord2f( s, t );
@@ -822,3 +853,193 @@ void EmitWaterPolys( msurface_t *warp, qboolean reverse )
 
 	GL_SetupFogColorForSurfaces();
 }
+
+/*
+============================================================
+
+	HALF-LIFE SOFTWARE WATER
+
+============================================================
+*/
+void R_ResetRipples( void )
+{
+	g_ripple.curbuf = g_ripple.buf[0];
+	g_ripple.oldbuf = g_ripple.buf[1];
+	g_ripple.time = g_ripple.oldtime = gpGlobals->time - 0.1;
+	memset( g_ripple.buf, 0, sizeof( g_ripple.buf ));
+}
+
+void R_InitRipples( void )
+{
+	rgbdata_t pic = { 0 };
+
+	pic.width = pic.height = RIPPLES_CACHEWIDTH;
+	pic.depth = 1;
+	pic.flags = IMAGE_HAS_COLOR;
+	pic.buffer = (byte *)g_ripple.texture;
+	pic.type = PF_RGBA_32;
+	pic.size = sizeof( g_ripple.texture );
+	pic.numMips = 1;
+	memset( pic.buffer, 0, pic.size );
+
+	g_ripple.rippletexturenum = GL_LoadTextureInternal( "*rippletex", &pic, TF_NOMIPMAP );
+}
+
+static void R_SwapBufs( void )
+{
+	short *tempbufp = g_ripple.curbuf;
+	g_ripple.curbuf = g_ripple.oldbuf;
+	g_ripple.oldbuf = tempbufp;
+}
+
+static void R_SpawnNewRipple( int x, int y, short val )
+{
+#define PIXEL( x, y ) ((( x ) & RIPPLES_CACHEWIDTH_MASK ) + ((( y ) & RIPPLES_CACHEWIDTH_MASK) << 7 ))
+	g_ripple.oldbuf[PIXEL( x, y )] += val;
+
+	val >>= 2;
+	g_ripple.oldbuf[PIXEL( x + 1, y )] += val;
+	g_ripple.oldbuf[PIXEL( x - 1, y )] += val;
+	g_ripple.oldbuf[PIXEL( x, y + 1 )] += val;
+	g_ripple.oldbuf[PIXEL( x, y - 1 )] += val;
+#undef PIXEL
+}
+
+static void R_RunRipplesAnimation( const short *oldbuf, short *pbuf )
+{
+	size_t i = 0;
+	const int w = RIPPLES_CACHEWIDTH;
+	const int m = RIPPLES_TEXSIZE_MASK;
+
+	for( i = w; i < m + w; i++, pbuf++ )
+	{
+		*pbuf = (
+			( (int)oldbuf[( i - ( w * 2 )) & m]
+			+ (int)oldbuf[( i - ( w + 1 )) & m]
+			+ (int)oldbuf[( i - ( w - 1 )) & m]
+			+ (int)oldbuf[( i ) & m]) >> 1 ) - (int)*pbuf;
+
+		*pbuf -= ( *pbuf >> 6 );
+	}
+}
+
+static int MostSignificantBit( unsigned int v )
+{
+#if __GNUC__
+	return 31 - __builtin_clz( v );
+#else
+	int i;
+	for( i = 0, v >>= 1; v; v >>= 1, i++ );
+	return i;
+#endif
+}
+
+void R_AnimateRipples( void )
+{
+	double frametime = gpGlobals->time - g_ripple.time;
+
+	g_ripple.update = r_ripple.value && frametime >= r_ripple_updatetime.value;
+
+	if( !g_ripple.update )
+		return;
+
+	g_ripple.time = gpGlobals->time;
+
+	R_SwapBufs();
+
+	if( g_ripple.time - g_ripple.oldtime > r_ripple_spawntime.value )
+	{
+		int x, y, val;
+
+		g_ripple.oldtime = g_ripple.time;
+
+		x = rand() & 0x7fff;
+		y = rand() & 0x7fff;
+		val = rand() & 0x3ff;
+
+		R_SpawnNewRipple( x, y, val );
+	}
+
+	R_RunRipplesAnimation( g_ripple.oldbuf, g_ripple.curbuf );
+}
+
+void R_UpdateRippleTexParams( void )
+{
+	gl_texture_t *tex = R_GetTexture( g_ripple.rippletexturenum );
+
+	GL_Bind( XASH_TEXTURE0, g_ripple.rippletexturenum );
+
+	if( gl_texture_nearest.value )
+	{
+		pglTexParameteri( tex->target, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
+		pglTexParameteri( tex->target, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
+	}
+	else
+	{
+		pglTexParameteri( tex->target, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
+		pglTexParameteri( tex->target, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
+	}
+}
+
+void R_UploadRipples( texture_t *image )
+{
+	gl_texture_t *glt;
+	uint32_t *pixels;
+	int wbits, wmask, wshft;
+
+	// discard unuseful textures
+	if( !r_ripple.value || image->width > RIPPLES_CACHEWIDTH || image->width != image->height )
+	{
+		GL_Bind( XASH_TEXTURE0, image->gl_texturenum );
+		return;
+	}
+
+	glt = R_GetTexture( image->gl_texturenum );
+	if( !glt || !glt->original || !glt->original->buffer || !FBitSet( glt->flags, TF_EXPAND_SOURCE ))
+	{
+		GL_Bind( XASH_TEXTURE0, image->gl_texturenum );
+		return;
+	}
+
+	GL_Bind( XASH_TEXTURE0, g_ripple.rippletexturenum );
+
+	// no updates this frame
+	if( !g_ripple.update && image->gl_texturenum == g_ripple.gl_texturenum )
+		return;
+
+	g_ripple.gl_texturenum = image->gl_texturenum;
+	if( r_ripple.value == 1.0f )
+	{
+		g_ripple.texturescale = Q_max( 1.0f, image->width / 64.0f );
+	}
+	else
+	{
+		g_ripple.texturescale = 1.0f;
+	}
+
+
+	pixels = (uint32_t *)glt->original->buffer;
+	wbits = MostSignificantBit( image->width );
+	wshft = 7 - wbits;
+	wmask = image->width - 1;
+
+	for( int y = 0; y < image->height; y++ )
+	{
+		int ry = y << ( 7 + wshft );
+
+		for( int x = 0; x < image->width; x++ )
+		{
+			int rx = x << wshft;
+			int val = g_ripple.curbuf[ry + rx] >> 4;
+
+			int py = (y - val) & wmask;
+			int px = (x + val) & wmask;
+			int p = ( py << wbits ) + px;
+
+			g_ripple.texture[(y << wbits) + x] = pixels[p];
+		}
+	}
+
+	pglTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, image->width, image->width, 0,
+		GL_RGBA, GL_UNSIGNED_BYTE, g_ripple.texture );
+}