The frameskip now also makes the 3D soft rasterizer skip frames. But it causes a problem that appears in iDeaS: 3D and 2D aren't synchronized when using frameskip. Feel free to revert it if that problem is annoying for you.

desmume/src/NDSSystem.cpp

@@ -1680,7 +1680,7 @@ u32 NDS_exec(s32 nb)
 				}
 				else if(nds.VCount==215)
 				{
-					gfx3d_VBlankEndSignal();
+					gfx3d_VBlankEndSignal(skipThisFrame);
 				}
 				else if(nds.VCount==263)
 				{

desmume/src/OGLRender.cpp

@@ -687,7 +687,7 @@ static void Control()
 	}
 }
 
-static void OGLRender()
+static void OGLRender(bool skipdraw)
 {
 	if(!BEGINGL()) return;
 

desmume/src/gfx3d.cpp

@@ -1374,12 +1374,12 @@ void gfx3d_VBlankSignal()
 	drawPending = TRUE;
 }
 
-void gfx3d_VBlankEndSignal()
+void gfx3d_VBlankEndSignal(bool skipdraw)
 {
 	if(!drawPending) return;
 
 	drawPending = FALSE;
-	gpu3D->NDS_3D_Render();
+	gpu3D->NDS_3D_Render(skipdraw);
 }
 
 #ifdef USE_GEOMETRY_FIFO_EMULATION

desmume/src/gfx3d.h

@@ -237,7 +237,7 @@ unsigned int gfx3d_glGetPosRes(unsigned int index);
 unsigned short gfx3d_glGetVecRes(unsigned int index);
 void gfx3d_glFlush(unsigned long v);
 void gfx3d_VBlankSignal();
-void gfx3d_VBlankEndSignal();
+void gfx3d_VBlankEndSignal(bool skipdraw);
 void gfx3d_Control(unsigned long v);
 u32 gfx3d_GetGXstatus();
 void gfx3d_sendCommandToFIFO(u32 val);

desmume/src/rasterize.cpp

@@ -1145,8 +1145,11 @@ static void clipPoly(POLY* poly)
 
 }
 
-static void SoftRastRender()
+static void SoftRastRender(bool skipdraw)
 {
+	if(skipdraw)
+		return;
+
 	Fragment clearFragment;
 	clearFragment.color.components.r = gfx3d.clearColor&0x1F;
 	clearFragment.color.components.g = (gfx3d.clearColor>>5)&0x1F;

desmume/src/render3D.cpp

@@ -26,13 +26,14 @@ static void NDS_nullFunc1		(void){}
 static char NDS_nullFunc2		(void){ return 1; }
 static void NDS_nullFunc3		(int,unsigned short*) {}
 static void NDS_nullFunc4		(int,unsigned short*,unsigned char*) {}
+static void NDS_nullFunc5		(bool){}
 
 GPU3DInterface gpu3DNull = { 
 	"None",
 	NDS_nullFunc2, //NDS_3D_Init
 	NDS_nullFunc1, //NDS_3D_Reset
 	NDS_nullFunc1, //NDS_3D_Close
-	NDS_nullFunc1, //NDS_3D_Render
+	NDS_nullFunc5, //NDS_3D_Render
 	NDS_nullFunc1, //NDS_3D_VramReconfigureSignal
 	NDS_nullFunc4, //NDS_3D_GetLine
 	NDS_nullFunc3 //NDS_3D_GetLineCaptured

desmume/src/render3D.h

@@ -39,7 +39,7 @@ typedef struct Render3DInterface
 	void (CALL_CONVENTION*  NDS_3D_Close)					(void);
 	
 	//called when the renderer should do its job and render the current display lists
-	void (CALL_CONVENTION*  NDS_3D_Render)					(void);
+	void (CALL_CONVENTION*  NDS_3D_Render)					(bool skipdraw);
 
 	//called when the emulator reconfigures its vram. you may need to invalidate your texture cache.
 	void (CALL_CONVENTION*  NDS_3D_VramReconfigureSignal)	();