gl_rmain.c

Quake 2 Source code for students by Theerthan You can also download from idsoftwares.com

	VectorNormalize( frustum[2].normal );
	VectorNormalize( frustum[3].normal );
#else
	// rotate VPN right by FOV_X/2 degrees
	RotatePointAroundVector( frustum[0].normal, vup, vpn, -(90-r_newrefdef.fov_x / 2 ) );
	// rotate VPN left by FOV_X/2 degrees
	RotatePointAroundVector( frustum[1].normal, vup, vpn, 90-r_newrefdef.fov_x / 2 );
	// rotate VPN up by FOV_X/2 degrees
	RotatePointAroundVector( frustum[2].normal, vright, vpn, 90-r_newrefdef.fov_y / 2 );
	// rotate VPN down by FOV_X/2 degrees
	RotatePointAroundVector( frustum[3].normal, vright, vpn, -( 90 - r_newrefdef.fov_y / 2 ) );
#endif

	for (i=0 ; i<4 ; i++)
	{
		frustum[i].type = PLANE_ANYZ;
		frustum[i].dist = DotProduct (r_origin, frustum[i].normal);
		frustum[i].signbits = SignbitsForPlane (&frustum[i]);
	}
}

//=======================================================================

/*
===============
R_SetupFrame
===============
*/
void R_SetupFrame (void)
{
	int i;
	mleaf_t	*leaf;

	r_framecount++;

// build the transformation matrix for the given view angles
	VectorCopy (r_newrefdef.vieworg, r_origin);

	AngleVectors (r_newrefdef.viewangles, vpn, vright, vup);

// current viewcluster
	if ( !( r_newrefdef.rdflags & RDF_NOWORLDMODEL ) )
	{
		r_oldviewcluster = r_viewcluster;
		r_oldviewcluster2 = r_viewcluster2;
		leaf = Mod_PointInLeaf (r_origin, r_worldmodel);
		r_viewcluster = r_viewcluster2 = leaf->cluster;

		// check above and below so crossing solid water doesn't draw wrong
		if (!leaf->contents)
		{	// look down a bit
			vec3_t	temp;

			VectorCopy (r_origin, temp);
			temp[2] -= 16;
			leaf = Mod_PointInLeaf (temp, r_worldmodel);
			if ( !(leaf->contents & CONTENTS_SOLID) &&
				(leaf->cluster != r_viewcluster2) )
				r_viewcluster2 = leaf->cluster;
		}
		else
		{	// look up a bit
			vec3_t	temp;

			VectorCopy (r_origin, temp);
			temp[2] += 16;
			leaf = Mod_PointInLeaf (temp, r_worldmodel);
			if ( !(leaf->contents & CONTENTS_SOLID) &&
				(leaf->cluster != r_viewcluster2) )
				r_viewcluster2 = leaf->cluster;
		}
	}

	for (i=0 ; i<4 ; i++)
		v_blend[i] = r_newrefdef.blend[i];

	c_brush_polys = 0;
	c_alias_polys = 0;

	// clear out the portion of the screen that the NOWORLDMODEL defines
	if ( r_newrefdef.rdflags & RDF_NOWORLDMODEL )
	{
		qglEnable( GL_SCISSOR_TEST );
		qglClearColor( 0.3, 0.3, 0.3, 1 );
		qglScissor( r_newrefdef.x, vid.height - r_newrefdef.height - r_newrefdef.y, r_newrefdef.width, r_newrefdef.height );
		qglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
		qglClearColor( 1, 0, 0.5, 0.5 );
		qglDisable( GL_SCISSOR_TEST );
	}
}


void MYgluPerspective( GLdouble fovy, GLdouble aspect,
		     GLdouble zNear, GLdouble zFar )
{
   GLdouble xmin, xmax, ymin, ymax;

   ymax = zNear * tan( fovy * M_PI / 360.0 );
   ymin = -ymax;

   xmin = ymin * aspect;
   xmax = ymax * aspect;

   xmin += -( 2 * gl_state.camera_separation ) / zNear;
   xmax += -( 2 * gl_state.camera_separation ) / zNear;

   qglFrustum( xmin, xmax, ymin, ymax, zNear, zFar );
}


/*
=============
R_SetupGL
=============
*/
void R_SetupGL (void)
{
	float	screenaspect;
//	float	yfov;
	int		x, x2, y2, y, w, h;

	//
	// set up viewport
	//
	x = floor(r_newrefdef.x * vid.width / vid.width);
	x2 = ceil((r_newrefdef.x + r_newrefdef.width) * vid.width / vid.width);
	y = floor(vid.height - r_newrefdef.y * vid.height / vid.height);
	y2 = ceil(vid.height - (r_newrefdef.y + r_newrefdef.height) * vid.height / vid.height);

	w = x2 - x;
	h = y - y2;

	qglViewport (x, y2, w, h);

	//
	// set up projection matrix
	//
    screenaspect = (float)r_newrefdef.width/r_newrefdef.height;
//	yfov = 2*atan((float)r_newrefdef.height/r_newrefdef.width)*180/M_PI;
	qglMatrixMode(GL_PROJECTION);
    qglLoadIdentity ();
    MYgluPerspective (r_newrefdef.fov_y,  screenaspect,  4,  4096);

	qglCullFace(GL_FRONT);

	qglMatrixMode(GL_MODELVIEW);
    qglLoadIdentity ();

    qglRotatef (-90,  1, 0, 0);	    // put Z going up
    qglRotatef (90,  0, 0, 1);	    // put Z going up
    qglRotatef (-r_newrefdef.viewangles[2],  1, 0, 0);
    qglRotatef (-r_newrefdef.viewangles[0],  0, 1, 0);
    qglRotatef (-r_newrefdef.viewangles[1],  0, 0, 1);
    qglTranslatef (-r_newrefdef.vieworg[0],  -r_newrefdef.vieworg[1],  -r_newrefdef.vieworg[2]);

//	if ( gl_state.camera_separation != 0 && gl_state.stereo_enabled )
//		qglTranslatef ( gl_state.camera_separation, 0, 0 );

	qglGetFloatv (GL_MODELVIEW_MATRIX, r_world_matrix);

	//
	// set drawing parms
	//
	if (gl_cull->value)
		qglEnable(GL_CULL_FACE);
	else
		qglDisable(GL_CULL_FACE);

	qglDisable(GL_BLEND);
	qglDisable(GL_ALPHA_TEST);
	qglEnable(GL_DEPTH_TEST);
}

/*
=============
R_Clear
=============
*/
void R_Clear (void)
{
	if (gl_ztrick->value)
	{
		static int trickframe;

		if (gl_clear->value)
			qglClear (GL_COLOR_BUFFER_BIT);

		trickframe++;
		if (trickframe & 1)
		{
			gldepthmin = 0;
			gldepthmax = 0.49999;
			qglDepthFunc (GL_LEQUAL);
		}
		else
		{
			gldepthmin = 1;
			gldepthmax = 0.5;
			qglDepthFunc (GL_GEQUAL);
		}
	}
	else
	{
		if (gl_clear->value)
			qglClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		else
			qglClear (GL_DEPTH_BUFFER_BIT);
		gldepthmin = 0;
		gldepthmax = 1;
		qglDepthFunc (GL_LEQUAL);
	}

	qglDepthRange (gldepthmin, gldepthmax);

}

void R_Flash( void )
{
	R_PolyBlend ();
}

/*
================
R_RenderView

r_newrefdef must be set before the first call
================
*/
void R_RenderView (refdef_t *fd)
{
	if (r_norefresh->value)
		return;

	r_newrefdef = *fd;

	if (!r_worldmodel && !( r_newrefdef.rdflags & RDF_NOWORLDMODEL ) )
		ri.Sys_Error (ERR_DROP, "R_RenderView: NULL worldmodel");

	if (r_speeds->value)
	{
		c_brush_polys = 0;
		c_alias_polys = 0;
	}

	R_PushDlights ();

	if (gl_finish->value)
		qglFinish ();

	R_SetupFrame ();

	R_SetFrustum ();

	R_SetupGL ();

	R_MarkLeaves ();	// done here so we know if we're in water

	R_DrawWorld ();

	R_DrawEntitiesOnList ();

	R_RenderDlights ();

	R_DrawParticles ();

	R_DrawAlphaSurfaces ();

	R_Flash();

	if (r_speeds->value)
	{
		ri.Con_Printf (PRINT_ALL, "%4i wpoly %4i epoly %i tex %i lmaps\n",
			c_brush_polys, 
			c_alias_polys, 
			c_visible_textures, 
			c_visible_lightmaps); 
	}
}


void	R_SetGL2D (void)
{
	// set 2D virtual screen size
	qglViewport (0,0, vid.width, vid.height);
	qglMatrixMode(GL_PROJECTION);
    qglLoadIdentity ();
	qglOrtho  (0, vid.width, vid.height, 0, -99999, 99999);
	qglMatrixMode(GL_MODELVIEW);
    qglLoadIdentity ();
	qglDisable (GL_DEPTH_TEST);
	qglDisable (GL_CULL_FACE);
	qglDisable (GL_BLEND);
	qglEnable (GL_ALPHA_TEST);
	qglColor4f (1,1,1,1);
}

static void GL_DrawColoredStereoLinePair( float r, float g, float b, float y )
{
	qglColor3f( r, g, b );
	qglVertex2f( 0, y );
	qglVertex2f( vid.width, y );
	qglColor3f( 0, 0, 0 );
	qglVertex2f( 0, y + 1 );
	qglVertex2f( vid.width, y + 1 );
}

static void GL_DrawStereoPattern( void )
{
	int i;

	if ( !( gl_config.renderer & GL_RENDERER_INTERGRAPH ) )
		return;

	if ( !gl_state.stereo_enabled )
		return;

	R_SetGL2D();

	qglDrawBuffer( GL_BACK_LEFT );

	for ( i = 0; i < 20; i++ )
	{
		qglBegin( GL_LINES );
			GL_DrawColoredStereoLinePair( 1, 0, 0, 0 );
			GL_DrawColoredStereoLinePair( 1, 0, 0, 2 );
			GL_DrawColoredStereoLinePair( 1, 0, 0, 4 );
			GL_DrawColoredStereoLinePair( 1, 0, 0, 6 );
			GL_DrawColoredStereoLinePair( 0, 1, 0, 8 );
			GL_DrawColoredStereoLinePair( 1, 1, 0, 10);
			GL_DrawColoredStereoLinePair( 1, 1, 0, 12);
			GL_DrawColoredStereoLinePair( 0, 1, 0, 14);
		qglEnd();
		
		GLimp_EndFrame();
	}
}


/*
====================
R_SetLightLevel

====================
*/
void R_SetLightLevel (void)
{
	vec3_t		shadelight;

	if (r_newrefdef.rdflags & RDF_NOWORLDMODEL)
		return;

	// save off light value for server to look at (BIG HACK!)

	R_LightPoint (r_newrefdef.vieworg, shadelight);

	// pick the greatest component, which should be the same
	// as the mono value returned by software
	if (shadelight[0] > shadelight[1])
	{
		if (shadelight[0] > shadelight[2])
			r_lightlevel->value = 150*shadelight[0];
		else
			r_lightlevel->value = 150*shadelight[2];
	}
	else
	{
		if (shadelight[1] > shadelight[2])
			r_lightlevel->value = 150*shadelight[1];
		else
			r_lightlevel->value = 150*shadelight[2];
	}

}

/*
@@@@@@@@@@@@@@@@@@@@@
R_RenderFrame

@@@@@@@@@@@@@@@@@@@@@
*/
void R_RenderFrame (refdef_t *fd)
{
	R_RenderView( fd );
	R_SetLightLevel ();
	R_SetGL2D ();
}


void R_Register( void )
{
	r_lefthand = ri.Cvar_Get( "hand", "0", CVAR_USERINFO | CVAR_ARCHIVE );
	r_norefresh = ri.Cvar_Get ("r_norefresh", "0", 0);
	r_fullbright = ri.Cvar_Get ("r_fullbright", "0", 0);
	r_drawentities = ri.Cvar_Get ("r_drawentities", "1", 0);
	r_drawworld = ri.Cvar_Get ("r_drawworld", "1", 0);
	r_novis = ri.Cvar_Get ("r_novis", "0", 0);
	r_nocull = ri.Cvar_Get ("r_nocull", "0", 0);
	r_lerpmodels = ri.Cvar_Get ("r_lerpmodels", "1", 0);
	r_speeds = ri.Cvar_Get ("r_speeds", "0", 0);

	r_lightlevel = ri.Cvar_Get ("r_lightlevel", "0", 0);

	gl_nosubimage = ri.Cvar_Get( "gl_nosubimage", "0", 0 );
	gl_allow_software = ri.Cvar_Get( "gl_allow_software", "0", 0 );

	gl_particle_min_size = ri.Cvar_Get( "gl_particle_min_size", "2", CVAR_ARCHIVE );
	gl_particle_max_size = ri.Cvar_Get( "gl_particle_max_size", "40", CVAR_ARCHIVE );
	gl_particle_size = ri.Cvar_Get( "gl_particle_size", "40", CVAR_ARCHIVE );
	gl_particle_att_a = ri.Cvar_Get( "gl_particle_att_a", "0.01", CVAR_ARCHIVE );
	gl_particle_att_b = ri.Cvar_Get( "gl_particle_att_b", "0.0", CVAR_ARCHIVE );
	gl_particle_att_c = ri.Cvar_Get( "gl_particle_att_c", "0.01", CVAR_ARCHIVE );

	gl_modulate = ri.Cvar_Get ("gl_modulate", "1", CVAR_ARCHIVE );
	gl_log = ri.Cvar_Get( "gl_log", "0", 0 );
	gl_bitdepth = ri.Cvar_Get( "gl_bitdepth", "0", 0 );
	gl_mode = ri.Cvar_Get( "gl_mode", "3", CVAR_ARCHIVE );
	gl_lightmap = ri.Cvar_Get ("gl_lightmap", "0", 0);
	gl_shadows = ri.Cvar_Get ("gl_shadows", "0", CVAR_ARCHIVE );
	gl_dynamic = ri.Cvar_Get ("gl_dynamic", "1", 0);
	gl_nobind = ri.Cvar_Get ("gl_nobind", "0", 0);
	gl_round_down = ri.Cvar_Get ("gl_round_down", "1", 0);
	gl_picmip = ri.Cvar_Get ("gl_picmip", "0", 0);
	gl_skymip = ri.Cvar_Get ("gl_skymip", "0", 0);
	gl_showtris = ri.Cvar_Get ("gl_showtris", "0", 0);
	gl_ztrick = ri.Cvar_Get ("gl_ztrick", "0", 0);
	gl_finish = ri.Cvar_Get ("gl_finish", "0", CVAR_ARCHIVE);
	gl_clear = ri.Cvar_Get ("gl_clear", "0", 0);
	gl_cull = ri.Cvar_Get ("gl_cull", "1", 0);
	gl_polyblend = ri.Cvar_Get ("gl_polyblend", "1", 0);
	gl_flashblend = ri.Cvar_Get ("gl_flashblend", "0", 0);
	gl_playermip = ri.Cvar_Get ("gl_playermip", "0", 0);
	gl_monolightmap = ri.Cvar_Get( "gl_monolightmap", "0", 0 );
	gl_driver = ri.Cvar_Get( "gl_driver", "opengl32", CVAR_ARCHIVE );
	gl_texturemode = ri.Cvar_Get( "gl_texturemode", "GL_LINEAR_MIPMAP_NEAREST", CVAR_ARCHIVE );
	gl_texturealphamode = ri.Cvar_Get( "gl_texturealphamode", "default", CVAR_ARCHIVE );
	gl_texturesolidmode = ri.Cvar_Get( "gl_texturesolidmode", "default", CVAR_ARCHIVE );
	gl_lockpvs = ri.Cvar_Get( "gl_lockpvs", "0", 0 );

	gl_vertex_arrays = ri.Cvar_Get( "gl_vertex_arrays", "0", CVAR_ARCHIVE );

	gl_ext_swapinterval = ri.Cvar_Get( "gl_ext_swapinterval", "1", CVAR_ARCHIVE );
	gl_ext_palettedtexture = ri.Cvar_Get( "gl_ext_palettedtexture", "1", CVAR_ARCHIVE );
	gl_ext_multitexture = ri.Cvar_Get( "gl_ext_multitexture", "1", CVAR_ARCHIVE );
	gl_ext_pointparameters = ri.Cvar_Get( "gl_ext_pointparameters", "1", CVAR_ARCHIVE );
	gl_ext_compiled_vertex_array = ri.Cvar_Get( "gl_ext_compiled_vertex_array", "1", CVAR_ARCHIVE );

	gl_drawbuffer = ri.Cvar_Get( "gl_drawbuffer", "GL_BACK", 0 );
	gl_swapinterval = ri.Cvar_Get( "gl_swapinterval", "1", CVAR_ARCHIVE );

	gl_saturatelighting = ri.Cvar_Get( "gl_saturatelighting", "0", 0 );

	gl_3dlabs_broken = ri.Cvar_Get( "gl_3dlabs_broken", "1", CVAR_ARCHIVE );

	vid_fullscreen = ri.Cvar_Get( "vid_fullscreen", "0", CVAR_ARCHIVE );
	vid_gamma = ri.Cvar_Get( "vid_gamma", "1.0", CVAR_ARCHIVE );
	vid_ref = ri.Cvar_Get( "vid_ref", "soft", CVAR_ARCHIVE );

	ri.Cmd_AddCommand( "imagelist", GL_ImageList_f );
	ri.Cmd_AddCommand( "screenshot", GL_ScreenShot_f );
	ri.Cmd_AddCommand( "modellist", Mod_Modellist_f );
	ri.Cmd_AddCommand( "gl_strings", GL_Strings_f );
}

/*
==================
R_SetMode
==================
*/
qboolean R_SetMode (void)
{
	rserr_t err;
	qboolean fullscreen;

	if ( vid_fullscreen->modified && !gl_config.allow_cds )
	{
		ri.Con_Printf( PRINT_ALL, "R_SetMode() - CDS not allowed with this driver\n" );
		ri.Cvar_SetValue( "vid_fullscreen", !vid_fullscreen->value );
		vid_fullscreen->modified = false;
	}

	fullscreen = vid_fullscreen->value;

	vid_fullscreen->modified = false;
	gl_mode->modified = false;

	if ( ( err = GLimp_SetMode( &vid.width, &vid.height, gl_mode->value, fullscreen ) ) == rserr_ok )
	{
		gl_state.prev_mode = gl_mode->value;
	}
	else
	{
		if ( err == rserr_invalid_fullscreen )
		{
			ri.Cvar_SetValue( "vid_fullscreen", 0);
			vid_fullscreen->modified = false;
			ri.Con_Printf( PRINT_ALL, "ref_gl::R_SetMode() - fullscreen unavailable in this mode\n" );
			if ( ( err = GLimp_SetMode( &vid.width, &vid.height, gl_mode->value, false ) ) == rserr_ok )
				return true;
		}
		else if ( err == rserr_invalid_mode )
		{
			ri.Cvar_SetValue( "gl_mode", gl_state.prev_mode );
			gl_mode->modified = false;
			ri.Con_Printf( PRINT_ALL, "ref_gl::R_SetMode() - invalid mode\n" );
		}

		// try setting it back to something safe
		if ( ( err = GLimp_SetMode( &vid.width, &vid.height, gl_state.prev_mode, false ) ) != rserr_ok )
		{
			ri.Con_Printf( PRINT_ALL, "ref_gl::R_SetMode() - could not revert to safe mode\n" );
			return false;
		}
	}
	return true;
}

/*
===============
R_Init
===============
*/
int R_Init( void *hinstance, void *hWnd )
{	
	char renderer_buffer[1000];
	char vendor_buffer[1000];
	int		err;
	int		j;
	extern float r_turbsin[256];

	for ( j = 0; j < 256; j++ )
	{
		r_turbsin[j] *= 0.5;
	}

	ri.Con_Printf (PRINT_ALL, "ref_gl version: "REF_VERSION"\n");

	Draw_GetPalette ();

	R_Register();

	// initialize our QGL dynamic bindings
	if ( !QGL_Init( gl_driver->string ) )
	{
		QGL_Shutdown();
        ri.Con_Printf (PRINT_ALL, "ref_gl::R_Init() - could not load \"%s\"\n", gl_driver->string );
		return -1;
	}

	// initialize OS-specific parts of OpenGL
	if ( !GLimp_Init( hinstance, hWnd ) )
	{
		QGL_Shutdown();
		return -1;
	}

	// set our "safe" modes
	gl_state.prev_mode = 3;

	// create the window and set up the context
	if ( !R_SetMode () )
	{
		QGL_Shutdown();
        ri.Con_Printf (PRINT_ALL, "ref_gl::R_Init() - could not R_SetMode()\n" );
		return -1;
	}

	ri.Vid_MenuInit();

	/*
	** get our various GL strings
	*/
	gl_config.vendor_string = qglGetString (GL_VENDOR);
	ri.Con_Printf (PRINT_ALL, "GL_VENDOR: %s\n", gl_config.vendor_string );
	gl_config.renderer_string = qglGetString (GL_RENDERER);
	ri.Con_Printf (PRINT_ALL, "GL_RENDERER: %s\n", gl_config.renderer_string );
	gl_config.version_string = qglGetString (GL_VERSION);
	ri.Con_Printf (PRINT_ALL, "GL_VERSION: %s\n", gl_config.version_string );
	gl_config.extensions_string = qglGetString (GL_EXTENSIONS);
	ri.Con_Printf (PRINT_ALL, "GL_EXTENSIONS: %s\n", gl_config.extensions_string );

	strcpy( renderer_buffer, gl_config.renderer_string );
	strlwr( renderer_buffer );