Add SDL video backend

engine/client/vid_common.c

@@ -0,0 +1,710 @@
+/*
+vid_common.c - common vid component
+Copyright (C) 2018 a1batross, Uncle Mike
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program 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 General Public License for more details.
+*/
+
+#include "common.h"
+#include "client.h"
+#include "gl_local.h"
+#include "mod_local.h"
+#include "input.h"
+#include "vid_common.h"
+
+#define WINDOW_NAME			"Xash3D Window" // Half-Life
+
+convar_t	*gl_extensions;
+convar_t	*gl_texture_anisotropy;
+convar_t	*gl_texture_lodbias;
+convar_t	*gl_texture_nearest;
+convar_t	*gl_lightmap_nearest;
+convar_t	*gl_keeptjunctions;
+convar_t	*gl_showtextures;
+convar_t	*gl_detailscale;
+convar_t	*gl_check_errors;
+convar_t	*gl_polyoffset;
+convar_t	*gl_wireframe;
+convar_t	*gl_finish;
+convar_t	*gl_nosort;
+convar_t	*gl_vsync;
+convar_t	*gl_clear;
+convar_t	*gl_test;
+convar_t	*gl_msaa;
+convar_t	*gl_stencilbits;
+
+convar_t	*scr_width;
+convar_t	*scr_height;
+convar_t	*window_xpos;
+convar_t	*window_ypos;
+convar_t	*r_speeds;
+convar_t	*r_fullbright;
+convar_t	*r_norefresh;
+convar_t	*r_lighting_extended;
+convar_t	*r_lighting_modulate;
+convar_t	*r_lighting_ambient;
+convar_t	*r_detailtextures;
+convar_t	*r_drawentities;
+convar_t	*r_adjust_fov;
+convar_t	*r_decals;
+convar_t	*r_novis;
+convar_t	*r_nocull;
+convar_t	*r_lockpvs;
+convar_t	*r_lockfrustum;
+convar_t	*r_traceglow;
+convar_t	*r_dynamic;
+convar_t	*r_lightmap;
+
+convar_t	*vid_displayfrequency;
+convar_t	*vid_fullscreen;
+convar_t	*vid_brightness;
+convar_t	*vid_gamma;
+convar_t	*vid_mode;
+convar_t	*vid_highdpi;
+
+byte		*r_temppool;
+
+ref_globals_t	tr;
+glconfig_t	glConfig;
+glstate_t		glState;
+glwstate_t	glw_state;
+
+/*
+=================
+GL_SetExtension
+=================
+*/
+void GL_SetExtension( int r_ext, int enable )
+{
+	if( r_ext >= 0 && r_ext < GL_EXTCOUNT )
+		glConfig.extension[r_ext] = enable ? GL_TRUE : GL_FALSE;
+	else Con_Printf( S_ERROR "GL_SetExtension: invalid extension %d\n", r_ext );
+}
+
+/*
+=================
+GL_Support
+=================
+*/
+qboolean GL_Support( int r_ext )
+{
+	if( r_ext >= 0 && r_ext < GL_EXTCOUNT )
+		return glConfig.extension[r_ext] ? true : false;
+	Con_Printf( S_ERROR "GL_Support: invalid extension %d\n", r_ext );
+
+	return false;
+}
+
+/*
+=================
+GL_MaxTextureUnits
+=================
+*/
+int GL_MaxTextureUnits( void )
+{
+	if( GL_Support( GL_SHADER_GLSL100_EXT ))
+		return Q_min( Q_max( glConfig.max_texture_coords, glConfig.max_teximage_units ), MAX_TEXTURE_UNITS );
+	return glConfig.max_texture_units;
+}
+
+/*
+=================
+GL_CheckExtension
+=================
+*/
+void GL_CheckExtension( const char *name, const dllfunc_t *funcs, const char *cvarname, int r_ext )
+{
+	const dllfunc_t	*func;
+	convar_t		*parm = NULL;
+	const char	*extensions_string;
+
+	MsgDev( D_NOTE, "GL_CheckExtension: %s ", name );
+	GL_SetExtension( r_ext, true );
+
+	if( cvarname )
+	{
+		// system config disable extensions
+		parm = Cvar_Get( cvarname, "1", FCVAR_GLCONFIG, va( CVAR_GLCONFIG_DESCRIPTION, name ));
+	}
+
+	if(( parm && !CVAR_TO_BOOL( parm )) || ( !CVAR_TO_BOOL( gl_extensions ) && r_ext != GL_OPENGL_110 ))
+	{
+		MsgDev( D_NOTE, "- disabled\n" );
+		GL_SetExtension( r_ext, false );
+		return; // nothing to process at
+	}
+
+	extensions_string = glConfig.extensions_string;
+
+	if(( name[2] == '_' || name[3] == '_' ) && !Q_strstr( extensions_string, name ))
+	{
+		GL_SetExtension( r_ext, false );	// update render info
+		MsgDev( D_NOTE, "- ^1failed\n" );
+		return;
+	}
+
+	// clear exports
+	for( func = funcs; func && func->name; func++ )
+		*func->func = NULL;
+
+	for( func = funcs; func && func->name != NULL; func++ )
+	{
+		// functions are cleared before all the extensions are evaluated
+		if((*func->func = (void *)GL_GetProcAddress( func->name )) == NULL )
+			GL_SetExtension( r_ext, false ); // one or more functions are invalid, extension will be disabled
+	}
+
+	if( GL_Support( r_ext ))
+		MsgDev( D_NOTE, "- ^2enabled\n" );
+	else MsgDev( D_NOTE, "- ^1failed\n" );
+}
+
+/*
+===============
+GL_SetDefaultTexState
+===============
+*/
+static void GL_SetDefaultTexState( void )
+{
+	int	i;
+
+	memset( glState.currentTextures, -1, MAX_TEXTURE_UNITS * sizeof( *glState.currentTextures ));
+	memset( glState.texCoordArrayMode, 0, MAX_TEXTURE_UNITS * sizeof( *glState.texCoordArrayMode ));
+	memset( glState.genSTEnabled, 0, MAX_TEXTURE_UNITS * sizeof( *glState.genSTEnabled ));
+
+	for( i = 0; i < MAX_TEXTURE_UNITS; i++ )
+	{
+		glState.currentTextureTargets[i] = GL_NONE;
+		glState.texIdentityMatrix[i] = true;
+	}
+}
+
+/*
+===============
+GL_SetDefaultState
+===============
+*/
+static void GL_SetDefaultState( void )
+{
+	memset( &glState, 0, sizeof( glState ));
+	GL_SetDefaultTexState ();
+
+	// init draw stack
+	tr.draw_list = &tr.draw_stack[0];
+	tr.draw_stack_pos = 0;
+}
+
+/*
+=================
+VID_StartupGamma
+=================
+*/
+void VID_StartupGamma( void )
+{
+	BuildGammaTable( vid_gamma->value, vid_brightness->value );
+	MsgDev( D_NOTE, "VID_StartupGamma: gamma %g brightness %g\n", vid_gamma->value, vid_brightness->value );
+	ClearBits( vid_brightness->flags, FCVAR_CHANGED );
+	ClearBits( vid_gamma->flags, FCVAR_CHANGED );
+}
+
+/*
+=================
+VID_InitDefaultResolution
+=================
+*/
+void VID_InitDefaultResolution( void )
+{
+	// we need to have something valid here
+	// until video subsystem initialized
+	glState.width = 640;
+	glState.height = 480;
+}
+
+/*
+=================
+R_SaveVideoMode
+=================
+*/
+void R_SaveVideoMode( int w, int h )
+{
+	glState.width = w;
+	glState.height = h;
+
+	Cvar_FullSet( "width", va( "%i", w ), FCVAR_READ_ONLY | FCVAR_RENDERINFO );
+	Cvar_FullSet( "height", va( "%i", h ), FCVAR_READ_ONLY | FCVAR_RENDERINFO );
+
+	if( vid_mode->value >= 0 && vid_mode->value <= R_MaxVideoModes() )
+		glState.wideScreen = R_GetVideoMode( vid_mode->value ).wideScreen;
+
+	MsgDev( D_NOTE, "Set: [%dx%d]\n", w, h );
+}
+
+/*
+=================
+R_DescribeVIDMode
+=================
+*/
+qboolean R_DescribeVIDMode( int width, int height )
+{
+	int	i;
+
+	for( i = 0; i < R_MaxVideoModes(); i++ )
+	{
+		vidmode_t vidmode = R_GetVideoMode( i );
+		if( vidmode.width == width && vidmode.height == height )
+		{
+			// found specified mode
+			Cvar_SetValue( "vid_mode", i );
+			return true;
+		}
+	}
+
+	return false;
+}
+
+/*
+=================
+VID_GetModeString
+=================
+*/
+const char *VID_GetModeString( int vid_mode )
+{
+	if( vid_mode < 0 || vid_mode > R_MaxVideoModes() )
+		return NULL;
+
+	return R_GetVideoMode( vid_mode ).desc;
+}
+
+/*
+==================
+VID_CheckChanges
+
+check vid modes and fullscreen
+==================
+*/
+void VID_CheckChanges( void )
+{
+	if( FBitSet( cl_allow_levelshots->flags, FCVAR_CHANGED ))
+	{
+		GL_FreeTexture( cls.loadingBar );
+		SCR_RegisterTextures(); // reload 'lambda' image
+		ClearBits( cl_allow_levelshots->flags, FCVAR_CHANGED );
+	}
+
+	if( host.renderinfo_changed )
+	{
+		if( !VID_SetMode( ))
+		{
+			Sys_Error( "Can't re-initialize video subsystem\n" );
+		}
+		else
+		{
+			host.renderinfo_changed = false;
+			SCR_VidInit(); // tell the client.dll what vid_mode has changed
+		}
+	}
+}
+
+/*
+===============
+GL_SetDefaults
+===============
+*/
+static void GL_SetDefaults( void )
+{
+	pglFinish();
+
+	pglClearColor( 0.5f, 0.5f, 0.5f, 1.0f );
+
+	pglDisable( GL_DEPTH_TEST );
+	pglDisable( GL_CULL_FACE );
+	pglDisable( GL_SCISSOR_TEST );
+	pglDepthFunc( GL_LEQUAL );
+	pglColor4f( 1.0f, 1.0f, 1.0f, 1.0f );
+
+	if( glState.stencilEnabled )
+	{
+		pglDisable( GL_STENCIL_TEST );
+		pglStencilMask( ( GLuint ) ~0 );
+		pglStencilFunc( GL_EQUAL, 0, ~0 );
+		pglStencilOp( GL_KEEP, GL_INCR, GL_INCR );
+	}
+
+	pglPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
+	pglPolygonOffset( -1.0f, -2.0f );
+
+	GL_CleanupAllTextureUnits();
+
+	pglDisable( GL_BLEND );
+	pglDisable( GL_ALPHA_TEST );
+	pglDisable( GL_POLYGON_OFFSET_FILL );
+	pglAlphaFunc( GL_GREATER, 0.0f );
+	pglEnable( GL_TEXTURE_2D );
+	pglShadeModel( GL_SMOOTH );
+	pglFrontFace( GL_CCW );
+
+	pglPointSize( 1.2f );
+	pglLineWidth( 1.2f );
+
+	GL_Cull( GL_NONE );
+}
+
+/*
+=================
+R_RenderInfo_f
+=================
+*/
+void R_RenderInfo_f( void )
+{
+	Con_Printf( "\n" );
+	Con_Printf( "GL_VENDOR: %s\n", glConfig.vendor_string );
+	Con_Printf( "GL_RENDERER: %s\n", glConfig.renderer_string );
+	Con_Printf( "GL_VERSION: %s\n", glConfig.version_string );
+
+	// don't spam about extensions
+	if( host_developer.value >= DEV_EXTENDED )
+	{
+		Con_Printf( "GL_EXTENSIONS: %s\n", glConfig.extensions_string );
+	}
+
+	Con_Printf( "GL_MAX_TEXTURE_SIZE: %i\n", glConfig.max_2d_texture_size );
+
+	if( GL_Support( GL_ARB_MULTITEXTURE ))
+		Con_Printf( "GL_MAX_TEXTURE_UNITS_ARB: %i\n", glConfig.max_texture_units );
+	if( GL_Support( GL_TEXTURE_CUBEMAP_EXT ))
+		Con_Printf( "GL_MAX_CUBE_MAP_TEXTURE_SIZE_ARB: %i\n", glConfig.max_cubemap_size );
+	if( GL_Support( GL_ANISOTROPY_EXT ))
+		Con_Printf( "GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT: %.1f\n", glConfig.max_texture_anisotropy );
+	if( GL_Support( GL_TEXTURE_2D_RECT_EXT ))
+		Con_Printf( "GL_MAX_RECTANGLE_TEXTURE_SIZE: %i\n", glConfig.max_2d_rectangle_size );
+	if( GL_Support( GL_TEXTURE_ARRAY_EXT ))
+		Con_Printf( "GL_MAX_ARRAY_TEXTURE_LAYERS_EXT: %i\n", glConfig.max_2d_texture_layers );
+	if( GL_Support( GL_SHADER_GLSL100_EXT ))
+	{
+		Con_Printf( "GL_MAX_TEXTURE_COORDS_ARB: %i\n", glConfig.max_texture_coords );
+		Con_Printf( "GL_MAX_TEXTURE_IMAGE_UNITS_ARB: %i\n", glConfig.max_teximage_units );
+		Con_Printf( "GL_MAX_VERTEX_UNIFORM_COMPONENTS_ARB: %i\n", glConfig.max_vertex_uniforms );
+		Con_Printf( "GL_MAX_VERTEX_ATTRIBS_ARB: %i\n", glConfig.max_vertex_attribs );
+	}
+
+	Con_Printf( "\n" );
+	Con_Printf( "MODE: %s\n", R_GetVideoMode(vid_mode->value).desc );
+	Con_Printf( "\n" );
+	Con_Printf( "VERTICAL SYNC: %s\n", gl_vsync->value ? "enabled" : "disabled" );
+	Con_Printf( "Color %d bits, Alpha %d bits, Depth %d bits, Stencil %d bits\n", glConfig.color_bits,
+		glConfig.alpha_bits, glConfig.depth_bits, glConfig.stencil_bits );
+}
+
+//=======================================================================
+
+/*
+=================
+GL_InitCommands
+=================
+*/
+void GL_InitCommands( void )
+{
+	// system screen width and height (don't suppose for change from console at all)
+	scr_width = Cvar_Get( "width", "640", FCVAR_RENDERINFO, "screen width" );
+	scr_height = Cvar_Get( "height", "480", FCVAR_RENDERINFO, "screen height" );
+	r_speeds = Cvar_Get( "r_speeds", "0", FCVAR_ARCHIVE, "shows renderer speeds" );
+	r_fullbright = Cvar_Get( "r_fullbright", "0", FCVAR_CHEAT, "disable lightmaps, get fullbright for entities" );
+	r_norefresh = Cvar_Get( "r_norefresh", "0", 0, "disable 3D rendering (use with caution)" );
+	r_lighting_extended = Cvar_Get( "r_lighting_extended", "1", FCVAR_ARCHIVE, "allow to get lighting from world and bmodels" );
+	r_lighting_modulate = Cvar_Get( "r_lighting_modulate", "0.6", FCVAR_ARCHIVE, "lightstyles modulate scale" );
+	r_lighting_ambient = Cvar_Get( "r_lighting_ambient", "0.3", FCVAR_ARCHIVE, "map ambient lighting scale" );
+	r_adjust_fov = Cvar_Get( "r_adjust_fov", "1", FCVAR_ARCHIVE, "making FOV adjustment for wide-screens" );
+	r_novis = Cvar_Get( "r_novis", "0", 0, "ignore vis information (perfomance test)" );
+	r_nocull = Cvar_Get( "r_nocull", "0", 0, "ignore frustrum culling (perfomance test)" );
+	r_detailtextures = Cvar_Get( "r_detailtextures", "1", FCVAR_ARCHIVE, "enable detail textures support, use '2' for autogenerate detail.txt" );
+	r_lockpvs = Cvar_Get( "r_lockpvs", "0", FCVAR_CHEAT, "lockpvs area at current point (pvs test)" );
+	r_lockfrustum = Cvar_Get( "r_lockfrustum", "0", FCVAR_CHEAT, "lock frustrum area at current point (cull test)" );
+	r_dynamic = Cvar_Get( "r_dynamic", "1", FCVAR_ARCHIVE, "allow dynamic lighting (dlights, lightstyles)" );
+	r_traceglow = Cvar_Get( "r_traceglow", "1", FCVAR_ARCHIVE, "cull flares behind models" );
+	r_lightmap = Cvar_Get( "r_lightmap", "0", FCVAR_CHEAT, "lightmap debugging tool" );
+	r_drawentities = Cvar_Get( "r_drawentities", "1", FCVAR_CHEAT, "render entities" );
+	r_decals = Cvar_Get( "r_decals", "4096", FCVAR_ARCHIVE, "sets the maximum number of decals" );
+	window_xpos = Cvar_Get( "_window_xpos", "130", FCVAR_RENDERINFO, "window position by horizontal" );
+	window_ypos = Cvar_Get( "_window_ypos", "48", FCVAR_RENDERINFO, "window position by vertical" );
+
+	gl_extensions = Cvar_Get( "gl_allow_extensions", "1", FCVAR_GLCONFIG, "allow gl_extensions" );
+	gl_texture_nearest = Cvar_Get( "gl_texture_nearest", "0", FCVAR_ARCHIVE, "disable texture filter" );
+	gl_lightmap_nearest = Cvar_Get( "gl_lightmap_nearest", "0", FCVAR_ARCHIVE, "disable lightmap filter" );
+	gl_check_errors = Cvar_Get( "gl_check_errors", "1", FCVAR_ARCHIVE, "ignore video engine errors" );
+	gl_vsync = Cvar_Get( "gl_vsync", "0", FCVAR_ARCHIVE,  "enable vertical syncronization" );
+	gl_detailscale = Cvar_Get( "gl_detailscale", "4.0", FCVAR_ARCHIVE, "default scale applies while auto-generate list of detail textures" );
+	gl_texture_anisotropy = Cvar_Get( "gl_anisotropy", "8", FCVAR_ARCHIVE, "textures anisotropic filter" );
+	gl_texture_lodbias =  Cvar_Get( "gl_texture_lodbias", "0.0", FCVAR_ARCHIVE, "LOD bias for mipmapped textures (perfomance|quality)" );
+	gl_keeptjunctions = Cvar_Get( "gl_keeptjunctions", "1", FCVAR_ARCHIVE, "removing tjuncs causes blinking pixels" );
+	gl_showtextures = Cvar_Get( "r_showtextures", "0", FCVAR_CHEAT, "show all uploaded textures" );
+	gl_finish = Cvar_Get( "gl_finish", "0", FCVAR_ARCHIVE, "use glFinish instead of glFlush" );
+	gl_nosort = Cvar_Get( "gl_nosort", "0", FCVAR_ARCHIVE, "disable sorting of translucent surfaces" );
+	gl_clear = Cvar_Get( "gl_clear", "0", FCVAR_ARCHIVE, "clearing screen after each frame" );
+	gl_test = Cvar_Get( "gl_test", "0", 0, "engine developer cvar for quick testing new features" );
+	gl_wireframe = Cvar_Get( "gl_wireframe", "0", FCVAR_ARCHIVE|FCVAR_SPONLY, "show wireframe overlay" );
+	gl_msaa = Cvar_Get( "gl_msaa", "0", FCVAR_GLCONFIG, "MSAA samples. Use with caution, engine may fail with some values" );
+	gl_stencilbits = Cvar_Get( "gl_stencilbits", "8", FCVAR_GLCONFIG, "pixelformat stencil bits (0 - auto)" );
+
+	// these cvar not used by engine but some mods requires this
+	gl_polyoffset = Cvar_Get( "gl_polyoffset", "2.0", FCVAR_ARCHIVE, "polygon offset for decals" );
+
+	// make sure gl_vsync is checked after vid_restart
+	SetBits( gl_vsync->flags, FCVAR_CHANGED );
+
+	vid_gamma = Cvar_Get( "gamma", "2.5", FCVAR_ARCHIVE, "gamma amount" );
+	vid_brightness = Cvar_Get( "brightness", "0.0", FCVAR_ARCHIVE, "brighntess factor" );
+	vid_mode = Cvar_Get( "vid_mode", "-1", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "display resolution mode" );
+	vid_fullscreen = Cvar_Get( "fullscreen", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "enable fullscreen mode" );
+	vid_displayfrequency = Cvar_Get ( "vid_displayfrequency", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "fullscreen refresh rate" );
+	vid_highdpi = Cvar_Get( "vid_highdpi", "1", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "Enable High-DPI mode" );
+
+	Cmd_AddCommand( "r_info", R_RenderInfo_f, "display renderer info" );
+
+	// apply actual video mode to window
+	Cbuf_AddText( "exec video.cfg\n" );
+	Cbuf_Execute();
+}
+
+/*
+=================
+GL_RemoveCommands
+=================
+*/
+void GL_RemoveCommands( void )
+{
+	Cmd_RemoveCommand( "r_info");
+}
+
+#ifdef WIN32
+typedef enum _XASH_DPI_AWARENESS
+{
+	XASH_DPI_UNAWARE = 0,
+	XASH_SYSTEM_DPI_AWARE = 1,
+	XASH_PER_MONITOR_DPI_AWARE = 2
+} XASH_DPI_AWARENESS;
+
+void WIN_SetDPIAwareness( void )
+{
+	HMODULE hModule;
+	HRESULT ( __stdcall *pSetProcessDpiAwareness )( XASH_DPI_AWARENESS );
+	BOOL ( __stdcall *pSetProcessDPIAware )( void );
+	BOOL bSuccess = FALSE;
+
+	if( ( hModule = LoadLibrary( "shcore.dll" ) ) )
+	{
+		if( ( pSetProcessDpiAwareness = (void*)GetProcAddress( hModule, "SetProcessDpiAwareness" ) ) )
+		{
+			// I hope SDL don't handle WM_DPICHANGED message
+			HRESULT hResult = pSetProcessDpiAwareness( XASH_SYSTEM_DPI_AWARE );
+
+			if( hResult == S_OK )
+			{
+				MsgDev( D_NOTE, "SetDPIAwareness: Success\n" );
+				bSuccess = TRUE;
+			}
+			else if( hResult = E_INVALIDARG ) MsgDev( D_NOTE, "SetDPIAwareness: Invalid argument\n" );
+			else if( hResult == E_ACCESSDENIED ) MsgDev( D_NOTE, "SetDPIAwareness: Access Denied\n" );
+		}
+		else MsgDev( D_NOTE, "SetDPIAwareness: Can't get SetProcessDpiAwareness\n" );
+		FreeLibrary( hModule );
+	}
+	else MsgDev( D_NOTE, "SetDPIAwareness: Can't load shcore.dll\n" );
+
+
+	if( !bSuccess )
+	{
+		MsgDev( D_NOTE, "SetDPIAwareness: Trying SetProcessDPIAware...\n" );
+
+		if( ( hModule = LoadLibrary( "user32.dll" ) ) )
+		{
+			if( ( pSetProcessDPIAware = ( void* )GetProcAddress( hModule, "SetProcessDPIAware" ) ) )
+			{
+				// I hope SDL don't handle WM_DPICHANGED message
+				BOOL hResult = pSetProcessDPIAware();
+
+				if( hResult )
+				{
+					MsgDev( D_NOTE, "SetDPIAwareness: Success\n" );
+					bSuccess = TRUE;
+				}
+				else MsgDev( D_NOTE, "SetDPIAwareness: fail\n" );
+			}
+			else MsgDev( D_NOTE, "SetDPIAwareness: Can't get SetProcessDPIAware\n" );
+			FreeLibrary( hModule );
+		}
+		else MsgDev( D_NOTE, "SetDPIAwareness: Can't load user32.dll\n" );
+	}
+}
+#endif
+
+static void SetWidthAndHeightFromCommandLine()
+{
+	int width;
+	int height;
+
+	Sys_GetIntFromCmdLine( "-width", &width );
+	Sys_GetIntFromCmdLine( "-height", &height );
+
+	if( width < 1 || height < 1 )
+	{
+		// Not specified or invalid, so don't bother.
+		return;
+	}
+
+	Cvar_SetValue( "vid_mode", VID_NOMODE );
+	Cvar_SetValue( "width", width );
+	Cvar_SetValue( "height", height );
+}
+
+static void SetFullscreenModeFromCommandLine( )
+{
+#ifndef __ANDROID__
+	if ( Sys_CheckParm("-fullscreen") )
+	{
+		Cvar_Set( "fullscreen", "1" );
+	}
+	else if ( Sys_CheckParm( "-windowed" ) )
+	{
+		Cvar_Set( "fullscreen", "0" );
+	}
+#endif
+}
+
+/*
+===============
+R_Init
+===============
+*/
+qboolean R_Init( void )
+{
+	if( glw_state.initialized )
+		return true;
+
+	// give initial OpenGL configuration
+	Cbuf_AddText( "exec opengl.cfg\n" );
+
+	GL_InitCommands();
+	GL_InitRandomTable();
+
+	// Set screen resolution and fullscreen mode if passed in on command line.
+	// This is done after executing opengl.cfg, as the command line values should take priority.
+	SetWidthAndHeightFromCommandLine();
+	SetFullscreenModeFromCommandLine();
+
+	GL_SetDefaultState();
+
+#ifdef WIN32
+	WIN_SetDPIAwareness( );
+#endif
+
+	// create the window and set up the context
+	if( !R_Init_OpenGL( ))
+	{
+		GL_RemoveCommands();
+		R_Free_OpenGL();
+
+		Sys_Error( "Can't initialize video subsystem\nProbably driver was not installed" );
+		return false;
+	}
+
+	host.renderinfo_changed = false;
+	r_temppool = Mem_AllocPool( "Render Zone" );
+
+	GL_InitExtensions();
+	GL_SetDefaults();
+	R_InitImages();
+	R_SpriteInit();
+	R_StudioInit();
+	R_AliasInit();
+	R_ClearDecals();
+	R_ClearScene();
+
+	// initialize screen
+	SCR_Init();
+
+	return true;
+}
+
+/*
+===============
+R_Shutdown
+===============
+*/
+void R_Shutdown( void )
+{
+	model_t	*mod;
+	int	i;
+
+	if( !glw_state.initialized )
+		return;
+
+	// release SpriteTextures
+	for( i = 1, mod = clgame.sprites; i < MAX_CLIENT_SPRITES; i++, mod++ )
+	{
+		if( !mod->name[0] ) continue;
+		Mod_UnloadSpriteModel( mod );
+	}
+	memset( clgame.sprites, 0, sizeof( clgame.sprites ));
+
+	GL_RemoveCommands();
+	R_ShutdownImages();
+
+	Mem_FreePool( &r_temppool );
+
+	// shut down OS specific OpenGL stuff like contexts, etc.
+	R_Free_OpenGL();
+}
+
+/*
+=================
+GL_CheckForErrors
+
+obsolete
+=================
+*/
+void GL_CheckForErrors_( const char *filename, const int fileline )
+{
+	int	err;
+	char	*str;
+
+	if( !gl_check_errors->value )
+		return;
+
+	if(( err = pglGetError( )) == GL_NO_ERROR )
+		return;
+
+	switch( err )
+	{
+	case GL_STACK_OVERFLOW:
+		str = "GL_STACK_OVERFLOW";
+		break;
+	case GL_STACK_UNDERFLOW:
+		str = "GL_STACK_UNDERFLOW";
+		break;
+	case GL_INVALID_ENUM:
+		str = "GL_INVALID_ENUM";
+		break;
+	case GL_INVALID_VALUE:
+		str = "GL_INVALID_VALUE";
+		break;
+	case GL_INVALID_OPERATION:
+		str = "GL_INVALID_OPERATION";
+		break;
+	case GL_OUT_OF_MEMORY:
+		str = "GL_OUT_OF_MEMORY";
+		break;
+	default:
+		str = "UNKNOWN ERROR";
+		break;
+	}
+
+	Con_Printf( S_OPENGL_ERROR "%s (called at %s:%i)\n", str, filename, fileline );
+}

engine/client/vid_common.h

@@ -0,0 +1,66 @@
+#pragma once
+#ifndef VID_COMMON
+#define VID_COMMON
+
+typedef struct vidmode_s
+{
+	const char	*desc;
+	int		width;
+	int		height;
+	qboolean		wideScreen;
+} vidmode_t;
+
+typedef enum
+{
+	rserr_ok,
+	rserr_invalid_fullscreen,
+	rserr_invalid_mode,
+	rserr_unknown
+} rserr_t;
+
+typedef enum
+{
+	VID_NOMODE = -2,
+	VID_AUTOMODE = -1,
+	VID_DEFAULTMODE = 3 // 640x480
+} vidmode_e;
+
+//
+// vid_common.c
+//
+qboolean VID_SetMode( void );
+#define GL_CheckForErrors() GL_CheckForErrors_( __FILE__, __LINE__ )
+void GL_CheckForErrors_( const char *filename, const int fileline );
+void GL_UpdateSwapInterval( void );
+qboolean GL_Support( int r_ext );
+void VID_CheckChanges( void );
+int GL_MaxTextureUnits( void );
+qboolean R_Init( void );
+void R_Shutdown( void );
+const char *VID_GetModeString( int vid_mode );
+qboolean R_DescribeVIDMode( int width, int height );
+void R_SaveVideoMode( int w, int h );
+void VID_StartupGamma( void );
+void GL_CheckExtension( const char *name, const dllfunc_t *funcs, const char *cvarname, int r_ext );
+void GL_SetExtension( int r_ext, int enable );
+
+//
+// platform-defined calls
+//
+void GL_InitExtensions( void );
+void VID_RestoreScreenResolution( void );
+qboolean VID_CreateWindow( int width, int height, qboolean fullscreen );
+void VID_DestroyWindow( void );
+qboolean R_Init_OpenGL( void );
+void R_Free_OpenGL( void );
+void *GL_GetProcAddress( const char *name );
+qboolean GL_CreateContext( void );
+qboolean GL_UpdateContext( void );
+qboolean GL_DeleteContext( void );
+int R_MaxVideoModes();
+vidmode_t R_GetVideoMode( int num );
+rserr_t R_ChangeDisplaySettings( int width, int height, qboolean fullscreen );
+void R_ChangeDisplaySettingsFast( int width, int height ); // for fast resizing
+qboolean VID_SetMode( void );
+
+#endif // VID_COMMON