Merge branch 'feature-stereo'

src/client/cl_entities.c

@@ -758,7 +758,13 @@ CL_CalcViewValues(void)
 		ops = ps; /* don't interpolate */
 	}
 
-	lerp = cl.lerpfrac;
+	if(cl_paused->value){
+		lerp = 1.0f;
+	}
+	else
+	{
+		lerp = cl.lerpfrac;
+	}
 
 	/* calculate the origin */
 	if ((cl_predict->value) && !(cl.frame.playerstate.pmove.pm_flags & PMF_NO_PREDICTION))

src/client/cl_main.c

@@ -95,6 +95,11 @@ cvar_t *hand;
 cvar_t *gender;
 cvar_t *gender_auto;
 
+
+cvar_t	*cl_stereo;
+cvar_t	*cl_stereo_separation;
+cvar_t	*cl_stereo_convergence;
+
 cvar_t *cl_vwep;
 
 client_static_t cls;
@@ -529,6 +534,10 @@ CL_InitLocal(void)
 	cl_paused = Cvar_Get("paused", "0", 0);
 	cl_timedemo = Cvar_Get("timedemo", "0", 0);
 
+	cl_stereo = Cvar_Get( "cl_stereo", "0", CVAR_ARCHIVE );
+	cl_stereo_separation = Cvar_Get( "cl_stereo_separation", "-0.4", CVAR_ARCHIVE );
+	cl_stereo_convergence = Cvar_Get( "cl_stereo_convergence", "1", CVAR_ARCHIVE );
+
 	rcon_client_password = Cvar_Get("rcon_password", "", 0);
 	rcon_address = Cvar_Get("rcon_address", "", 0);
 

src/client/cl_screen.c

@@ -492,7 +492,6 @@ SCR_DrawLoading(void)
 		return;
 	}
 
-	scr_draw_loading = false;
 	Draw_GetPicSize(&w, &h, "loading");
 	Draw_PicScaled((viddef.width - w * scale) / 2, (viddef.height - h * scale) / 2, "loading", scale);
 }
@@ -609,6 +608,9 @@ SCR_BeginLoadingPlaque(void)
 	}
 
 	SCR_UpdateScreen();
+
+	scr_draw_loading = false;
+
 	SCR_StopCinematic();
 	cls.disable_screen = Sys_Milliseconds();
 	cls.disable_servercount = cl.servercount;
@@ -1441,9 +1443,18 @@ SCR_UpdateScreen(void)
 		return; /* not initialized yet */
 	}
 
-	separation[0] = 0;
+	if ( cl_stereo->value )
-	separation[1] = 0;
+	{
-	numframes = 1;
+		numframes = 2;
+		separation[0] = -cl_stereo_separation->value / 2;
+		separation[1] = +cl_stereo_separation->value / 2;
+	}		
+	else
+	{
+		separation[0] = 0;
+		separation[1] = 0;
+		numframes = 1;
+	}
 
 	for (i = 0; i < numframes; i++)
 	{
@@ -1454,8 +1465,14 @@ SCR_UpdateScreen(void)
 			/* loading plaque over black screen */
 			int w, h;
 
-			R_SetPalette(NULL);
+			if(i == 0){
-			scr_draw_loading = false;
+				R_SetPalette(NULL);
+			}
+
+			if(i == numframes - 1){
+				scr_draw_loading = false;
+			}
+
 			Draw_GetPicSize(&w, &h, "loading");
 			Draw_PicScaled((viddef.width - w * scale) / 2, (viddef.height - h * scale) / 2, "loading", scale);
 		}

src/client/cl_view.c

@@ -31,11 +31,18 @@ int gun_frame;
 struct model_s *gun_model;
 
 cvar_t *crosshair;
+cvar_t *crosshair_3d;
+cvar_t *crosshair_3d_glow;
+cvar_t *crosshair_3d_color;
+
 cvar_t *crosshair_scale;
 cvar_t *cl_testparticles;
 cvar_t *cl_testentities;
 cvar_t *cl_testlights;
 cvar_t *cl_testblend;
+cvar_t *crosshair_3d_glow_r;
+cvar_t *crosshair_3d_glow_g;
+cvar_t *crosshair_3d_glow_b;
 
 cvar_t *cl_stats;
 
@@ -53,6 +60,8 @@ lightstyle_t r_lightstyles[MAX_LIGHTSTYLES];
 char cl_weaponmodels[MAX_CLIENTWEAPONMODELS][MAX_QPATH];
 int num_cl_weaponmodels;
 
+void V_Render3dCrosshair(void);
+
 /*
  * Specifies the model that will be used as the world
  */
@@ -494,6 +503,9 @@ V_RenderView(float stereo_separation)
 		   v_forward, etc. */
 		CL_AddEntities();
 
+		// before changing viewport we should trace the crosshair position
+		V_Render3dCrosshair();
+
 		if (cl_testparticles->value)
 		{
 			V_TestParticles();
@@ -519,6 +531,7 @@ V_RenderView(float stereo_separation)
 
 		/* offset vieworg appropriately if
 		   we're doing stereo separation */
+
 		if (stereo_separation != 0)
 		{
 			vec3_t tmp;
@@ -572,6 +585,18 @@ V_RenderView(float stereo_separation)
 		qsort(cl.refdef.entities, cl.refdef.num_entities,
 				sizeof(cl.refdef.entities[0]), (int (*)(const void *, const void *))
 				entitycmpfnc);
+	} else if (cl.frame.valid && cl_paused->value && cl_stereo->value) {  
+		// We need to adjust the refdef in stereo mode when paused.  
+		vec3_t tmp;  
+		CL_CalcViewValues();  
+		VectorScale( cl.v_right, stereo_separation, tmp );  
+		VectorAdd( cl.refdef.vieworg, tmp, cl.refdef.vieworg );  
+		  
+		cl.refdef.vieworg[0] += 1.0/16;  
+		cl.refdef.vieworg[1] += 1.0/16;  
+		cl.refdef.vieworg[2] += 1.0/16;  
+
+		cl.refdef.time = cl.time*0.001;  
 	}  
 
 	cl.refdef.x = scr_vrect.x;
@@ -602,6 +627,53 @@ V_RenderView(float stereo_separation)
 	SCR_DrawCrosshair();
 }
 
+void 
+V_Render3dCrosshair(void)
+{
+	trace_t crosshair_trace;
+	vec3_t end;
+	vec_t *crosshair_pos;
+
+	crosshair_3d = Cvar_Get("crosshair_3d", "0", CVAR_ARCHIVE);
+	crosshair_3d_glow = Cvar_Get("crosshair_3d_glow", "0", CVAR_ARCHIVE);
+	
+
+	if(crosshair_3d->value || crosshair_3d_glow->value){
+		VectorMA(cl.refdef.vieworg,8192,cl.v_forward,end);
+		crosshair_trace = CL_PMTrace(cl.refdef.vieworg, vec3_origin, vec3_origin, end);
+
+		if(crosshair_3d_glow->value){
+			crosshair_3d_glow_r = Cvar_Get("crosshair_3d_glow_r", "5", CVAR_ARCHIVE);
+			crosshair_3d_glow_g = Cvar_Get("crosshair_3d_glow_g", "1", CVAR_ARCHIVE);
+			crosshair_3d_glow_b = Cvar_Get("crosshair_3d_glow_b", "4", CVAR_ARCHIVE);
+
+			V_AddLight(
+				crosshair_trace.endpos, 
+				crosshair_3d_glow->value, 
+				crosshair_3d_glow_r->value, 
+				crosshair_3d_glow_g->value, 
+				crosshair_3d_glow_b->value
+			);
+		}
+
+		if(crosshair_3d->value){
+			entity_t crosshair_ent = {0};
+
+			crosshair_ent.origin[0] = crosshair_trace.endpos[0];
+			crosshair_ent.origin[1] = crosshair_trace.endpos[1];
+			crosshair_ent.origin[2] = crosshair_trace.endpos[2];
+
+			crosshair_ent.model = R_RegisterModel("models/crosshair/tris.md2");
+			//crosshair_ent.skin = R_RegisterSkin("models/crosshair/skin.pcx");
+
+			AngleVectors2(crosshair_trace.plane.normal, crosshair_ent.angles);
+			crosshair_ent.flags = RF_DEPTHHACK | RF_FULLBRIGHT | RF_NOSHADOW;
+
+			V_AddEntity(&crosshair_ent);
+		}
+	}
+}
+
 void
 V_Viewpos_f(void)
 {

src/client/header/client.h

@@ -248,6 +248,7 @@ extern client_static_t	cls;
 
 /* cvars */
 extern	cvar_t	*cl_stereo_separation;
+extern	cvar_t	*cl_stereo_convergence;
 extern	cvar_t	*cl_stereo;
 extern	cvar_t	*cl_gun;
 extern	cvar_t	*cl_add_blend;
@@ -506,5 +507,6 @@ void CL_KeyInventory (int key);
 void CL_DrawInventory (void);
 
 void CL_PredictMovement (void);
+trace_t CL_PMTrace(vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end);
 
 #endif

src/client/refresh/header/local.h

@@ -117,6 +117,23 @@ typedef enum
 	it_sky
 } imagetype_t;
 
+enum stereo_modes {
+	STEREO_MODE_NONE,
+	STEREO_MODE_OPENGL,
+	STEREO_MODE_ANAGLYPH,
+	STEREO_MODE_ROW_INTERLEAVED,
+	STEREO_MODE_COLUMN_INTERLEAVED,
+	STEREO_MODE_PIXEL_INTERLEAVED,
+	STEREO_SPLIT_HORIZONTAL,
+	STEREO_SPLIT_VERTICAL,
+};
+
+enum opengl_special_buffer_modes {
+	OPENGL_SPECIAL_BUFFER_MODE_NONE,
+	OPENGL_SPECIAL_BUFFER_MODE_STEREO,
+	OPENGL_SPECIAL_BUFFER_MODE_STENCIL,
+};
+
 typedef struct image_s
 {
 	char name[MAX_QPATH];               /* game path, including extension */
@@ -382,7 +399,7 @@ typedef struct
 	int currenttmu;
 
 	float camera_separation;
-	qboolean stereo_enabled;
+	enum stereo_modes stereo_mode;
 
 	qboolean hwgamma;
 

src/client/refresh/r_main.c

@@ -142,6 +142,11 @@ cvar_t *gl_msaa_samples;
 cvar_t *vid_fullscreen;
 cvar_t *vid_gamma;
 
+cvar_t *cl_stereo;
+cvar_t *cl_stereo_separation;
+cvar_t *cl_stereo_anaglyph_colors;
+cvar_t *cl_stereo_convergence;
+
 /*
  * Returns true if the box is completely outside the frustom
  */
@@ -467,7 +472,10 @@ R_DrawParticles2(int num_particles, const particle_t particles[],
 void
 R_DrawParticles(void)
 {
-	if (gl_ext_pointparameters->value && qglPointParameterfEXT)
+	qboolean stereo_split_tb = ((gl_state.stereo_mode == STEREO_SPLIT_VERTICAL) && gl_state.camera_separation);
+	qboolean stereo_split_lr = ((gl_state.stereo_mode == STEREO_SPLIT_HORIZONTAL) && gl_state.camera_separation);
+
+	if (gl_ext_pointparameters->value && qglPointParameterfEXT && !(stereo_split_tb || stereo_split_lr))
 	{
 		int i;
 		unsigned char color[4];
@@ -678,8 +686,8 @@ R_MYgluPerspective(GLdouble fovy, GLdouble aspect,
 	xmin = ymin * aspect;
 	xmax = ymax * aspect;
 
-	xmin += -(2 * gl_state.camera_separation) / zNear;
+	xmin += - cl_stereo_convergence->value * (2 * gl_state.camera_separation) / zNear;
-	xmax += -(2 * gl_state.camera_separation) / zNear;
+	xmax += - cl_stereo_convergence->value * (2 * gl_state.camera_separation) / zNear;
 
 	glFrustum(xmin, xmax, ymin, ymax, zNear, zFar);
 }
@@ -700,6 +708,20 @@ R_SetupGL(void)
 	w = x2 - x;
 	h = y - y2;
 
+	qboolean drawing_left_eye = gl_state.camera_separation < 0;
+	qboolean stereo_split_tb = ((gl_state.stereo_mode == STEREO_SPLIT_VERTICAL) && gl_state.camera_separation);
+	qboolean stereo_split_lr = ((gl_state.stereo_mode == STEREO_SPLIT_HORIZONTAL) && gl_state.camera_separation);
+
+	if(stereo_split_lr) {
+		w = w / 2;
+		x = drawing_left_eye ? (x / 2) : (x + vid.width) / 2;
+	}
+
+	if(stereo_split_tb) {
+		h = h / 2;
+		y2 = drawing_left_eye ? (y2 + vid.height) / 2 : (y2 / 2);
+	}
+
 	glViewport(x, y2, w, h);
 
 	/* set up projection matrix */
@@ -749,13 +771,20 @@ R_SetupGL(void)
 void
 R_Clear(void)
 {
+	// Check whether the stencil buffer needs clearing, and do so if need be.
+	GLbitfield stencilFlags = 0;
+	if (gl_state.stereo_mode >= STEREO_MODE_ROW_INTERLEAVED && gl_state.stereo_mode <= STEREO_MODE_PIXEL_INTERLEAVED) {
+		glClearStencil(0);
+		stencilFlags |= GL_STENCIL_BUFFER_BIT;
+	}
+
 	if (gl_ztrick->value)
 	{
 		static int trickframe;
 
 		if (gl_clear->value)
 		{
-			glClear(GL_COLOR_BUFFER_BIT);
+			glClear(GL_COLOR_BUFFER_BIT | stencilFlags);
 		}
 
 		trickframe++;
@@ -777,11 +806,11 @@ R_Clear(void)
 	{
 		if (gl_clear->value)
 		{
-			glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+			glClear(GL_COLOR_BUFFER_BIT | stencilFlags | GL_DEPTH_BUFFER_BIT);
 		}
 		else
 		{
-			glClear(GL_DEPTH_BUFFER_BIT);
+			glClear(GL_DEPTH_BUFFER_BIT | stencilFlags);
 		}
 
 		gldepthmin = 0;
@@ -823,6 +852,113 @@ R_Flash(void)
 void
 R_RenderView(refdef_t *fd)
 {
+	if ((gl_state.stereo_mode != STEREO_MODE_NONE) && gl_state.camera_separation) {
+
+		qboolean drawing_left_eye = gl_state.camera_separation < 0;
+		switch (gl_state.stereo_mode) {
+			case STEREO_MODE_ANAGLYPH:
+				{
+
+					// Work out the colour for each eye.
+					int anaglyph_colours[] = { 0x4, 0x3 }; // Left = red, right = cyan.
+					
+					if (strlen(cl_stereo_anaglyph_colors->string) == 2) {
+						int eye, colour, missing_bits;
+						// Decode the colour name from its character.
+						for (eye = 0; eye < 2; ++eye) {
+							colour = 0;
+							switch (toupper(cl_stereo_anaglyph_colors->string[eye])) {
+								case 'B': ++colour; // 001 Blue
+								case 'G': ++colour; // 010 Green
+								case 'C': ++colour; // 011 Cyan
+								case 'R': ++colour; // 100 Red
+								case 'M': ++colour; // 101 Magenta
+								case 'Y': ++colour; // 110 Yellow
+									anaglyph_colours[eye] = colour;
+									break;
+							}
+						}
+						// Fill in any missing bits.
+						missing_bits = ~(anaglyph_colours[0] | anaglyph_colours[1]) & 0x3;
+						for (eye = 0; eye < 2; ++eye) {
+							anaglyph_colours[eye] |= missing_bits;
+						}
+					}
+	
+					// Set the current colour.
+					glColorMask(
+						!!(anaglyph_colours[drawing_left_eye] & 0x4),
+						!!(anaglyph_colours[drawing_left_eye] & 0x2),
+						!!(anaglyph_colours[drawing_left_eye] & 0x1),
+						GL_TRUE
+					);					
+				}
+				break;
+			case STEREO_MODE_ROW_INTERLEAVED:
+			case STEREO_MODE_COLUMN_INTERLEAVED:
+			case STEREO_MODE_PIXEL_INTERLEAVED:
+				{
+					qboolean flip_eyes = true;
+					int client_x, client_y;
+
+					//GLimp_GetClientAreaOffset(&client_x, &client_y);
+					client_x = 0;
+					client_y = 0;
+
+					R_SetGL2D();
+
+					glEnable(GL_STENCIL_TEST);
+					glStencilMask(GL_TRUE);
+					glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+
+					glStencilOp(GL_REPLACE, GL_KEEP, GL_KEEP);
+					glStencilFunc(GL_NEVER, 0, 1);
+
+					glBegin(GL_QUADS);
+					{
+						glVertex2i(0, 0);
+						glVertex2i(vid.width, 0);
+						glVertex2i(vid.width, vid.height);
+						glVertex2i(0, vid.height);
+					}
+					glEnd();
+
+					glStencilOp(GL_INVERT, GL_KEEP, GL_KEEP);
+					glStencilFunc(GL_NEVER, 1, 1);
+
+					glBegin(GL_LINES);
+					{
+						if (gl_state.stereo_mode == STEREO_MODE_ROW_INTERLEAVED || gl_state.stereo_mode == STEREO_MODE_PIXEL_INTERLEAVED) {
+							int y;
+							for (y = 0; y <= vid.height; y += 2) {
+								glVertex2f(0, y - 0.5f);
+								glVertex2f(vid.width, y - 0.5f);
+							}
+							flip_eyes ^= (client_y & 1);
+						}
+
+						if (gl_state.stereo_mode == STEREO_MODE_COLUMN_INTERLEAVED || gl_state.stereo_mode == STEREO_MODE_PIXEL_INTERLEAVED) {
+							int x;
+							for (x = 0; x <= vid.width; x += 2) {
+								glVertex2f(x - 0.5f, 0);
+								glVertex2f(x - 0.5f, vid.height);
+							}
+							flip_eyes ^= (client_x & 1);
+						}
+					}
+					glEnd();
+
+					glStencilMask(GL_FALSE);
+					glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+
+					glStencilFunc(GL_EQUAL, drawing_left_eye ^ flip_eyes, 1);
+					glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+				}
+				break;
+		}
+	}
+
+
 	if (gl_norefresh->value)
 	{
 		return;
@@ -874,13 +1010,44 @@ R_RenderView(refdef_t *fd)
 				c_brush_polys, c_alias_polys, c_visible_textures,
 				c_visible_lightmaps);
 	}
+
+	switch (gl_state.stereo_mode) {
+		case STEREO_MODE_ANAGLYPH:
+			glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+			break;
+		case STEREO_MODE_ROW_INTERLEAVED:
+		case STEREO_MODE_COLUMN_INTERLEAVED:
+		case STEREO_MODE_PIXEL_INTERLEAVED:
+			glDisable(GL_STENCIL_TEST);
+			break;
+	}
 }
 
 void
 R_SetGL2D(void)
 {
+	int x, w, y, h;
 	/* set 2D virtual screen size */
-	glViewport(0, 0, vid.width, vid.height);
+	qboolean drawing_left_eye = gl_state.camera_separation < 0;
+	qboolean stereo_split_tb = ((gl_state.stereo_mode == STEREO_SPLIT_VERTICAL) && gl_state.camera_separation);
+	qboolean stereo_split_lr = ((gl_state.stereo_mode == STEREO_SPLIT_HORIZONTAL) && gl_state.camera_separation);
+
+	x = 0;
+	w = vid.width;
+	y = 0;
+	h = vid.height;
+
+	if(stereo_split_lr) {
+		w =  w / 2;
+		x = drawing_left_eye ? 0 : w;
+	}
+
+	if(stereo_split_tb) {
+		h =  h / 2;
+		y = drawing_left_eye ? h : 0;
+	}
+
+	glViewport(x, y, w, h);
 	glMatrixMode(GL_PROJECTION);
 	glLoadIdentity();
 	glOrtho(0, vid.width, vid.height, 0, -99999, 99999);
@@ -893,6 +1060,23 @@ R_SetGL2D(void)
 	glColor4f(1, 1, 1, 1);
 }
 
+enum opengl_special_buffer_modes GL_GetSpecialBufferModeForStereoMode(enum stereo_modes stereo_mode) {
+	switch (stereo_mode) {
+		case STEREO_MODE_NONE:
+		case STEREO_SPLIT_HORIZONTAL:
+		case STEREO_SPLIT_VERTICAL:
+		case STEREO_MODE_ANAGLYPH:
+			return OPENGL_SPECIAL_BUFFER_MODE_NONE;
+		case STEREO_MODE_OPENGL:
+			return OPENGL_SPECIAL_BUFFER_MODE_STEREO;
+		case STEREO_MODE_ROW_INTERLEAVED:
+		case STEREO_MODE_COLUMN_INTERLEAVED:
+		case STEREO_MODE_PIXEL_INTERLEAVED:
+			return OPENGL_SPECIAL_BUFFER_MODE_STENCIL;
+	}
+	return OPENGL_SPECIAL_BUFFER_MODE_NONE;
+}
+
 void
 R_SetLightLevel(void)
 {
@@ -1018,6 +1202,12 @@ R_Register(void)
 
 	gl_retexturing = Cvar_Get("gl_retexturing", "1", CVAR_ARCHIVE);
 
+
+	cl_stereo = Cvar_Get( "cl_stereo", "0", CVAR_ARCHIVE );
+	cl_stereo_separation = Cvar_Get( "cl_stereo_separation", "-0.4", CVAR_ARCHIVE );
+	cl_stereo_anaglyph_colors = Cvar_Get( "cl_stereo_anaglyph_colors", "rc", CVAR_ARCHIVE );
+	cl_stereo_convergence = Cvar_Get( "cl_stereo_convergence", "1", CVAR_ARCHIVE );
+
 	Cmd_AddCommand("imagelist", R_ImageList_f);
 	Cmd_AddCommand("screenshot", R_ScreenShot);
 	Cmd_AddCommand("modellist", Mod_Modellist_f);
@@ -1128,6 +1318,7 @@ R_Init(void *hinstance, void *hWnd)
 
 	/* set our "safe" mode */
 	gl_state.prev_mode = 4;
+	gl_state.stereo_mode = cl_stereo->value;
 
 	/* create the window and set up the context */
 	if (!R_SetMode())
@@ -1344,6 +1535,21 @@ R_BeginFrame(float camera_separation)
 		vid_fullscreen->modified = true;
 	}
 
+	// force a vid_restart if cl_stereo has been modified.
+	if ( gl_state.stereo_mode != cl_stereo->value ) {
+		// If we've gone from one mode to another with the same special buffer requirements there's no need to restart.
+		if ( GL_GetSpecialBufferModeForStereoMode( gl_state.stereo_mode ) == GL_GetSpecialBufferModeForStereoMode( cl_stereo->value )  ) {
+			gl_state.stereo_mode = cl_stereo->value;
+		}
+		else
+		{
+			VID_Printf(PRINT_ALL, "stereo supermode changed, restarting video!\n");
+			cvar_t	*ref;
+			ref = Cvar_Get("vid_fullscreen", "0", CVAR_ARCHIVE);
+			ref->modified = true;
+		}
+	}
+
 	if (vid_gamma->modified)
 	{
 		vid_gamma->modified = false;
@@ -1355,7 +1561,28 @@ R_BeginFrame(float camera_separation)
 	}
 
 	/* go into 2D mode */
-	glViewport(0, 0, vid.width, vid.height);
+
+	int x, w, y, h;
+	qboolean drawing_left_eye = gl_state.camera_separation < 0;
+	qboolean stereo_split_tb = ((gl_state.stereo_mode == STEREO_SPLIT_VERTICAL) && gl_state.camera_separation);
+	qboolean stereo_split_lr = ((gl_state.stereo_mode == STEREO_SPLIT_HORIZONTAL) && gl_state.camera_separation);
+
+	x = 0;
+	w = vid.width;
+	y = 0;
+	h = vid.height;
+
+	if(stereo_split_lr) {
+		w =  w / 2;
+		x = drawing_left_eye ? 0 : w;
+	}
+
+	if(stereo_split_tb) {
+		h =  h / 2;
+		y = drawing_left_eye ? h : 0;
+	}
+
+	glViewport(x, y, w, h);
 	glMatrixMode(GL_PROJECTION);
 	glLoadIdentity();
 	glOrtho(0, vid.width, vid.height, 0, -99999, 99999);
@@ -1372,7 +1599,7 @@ R_BeginFrame(float camera_separation)
 	{
 		gl_drawbuffer->modified = false;
 
-		if ((gl_state.camera_separation == 0) || !gl_state.stereo_enabled)
+		if ((gl_state.camera_separation == 0) || gl_state.stereo_mode != STEREO_MODE_OPENGL)
 		{
 			if (Q_stricmp(gl_drawbuffer->string, "GL_FRONT") == 0)
 			{