port: finish drawing before copying the backbuffer

port/fast3d/gfx_pc.cpp

@@ -2652,6 +2652,9 @@ static void gfx_run_dl(Gfx* cmd) {
                 // TODO: skyRender uses these to render some types of skies and skybox water
                 // by issuing low-level ucode commands G_TRI_FILL and G_TRI_SHADE_TXTR
                 break;
+            case G_RDPFLUSH_EXT:
+                gfx_flush();
+                break;
             case G_RDPPIPESYNC:
             case G_RDPFULLSYNC:
             case G_RDPLOADSYNC:

src/game/bondview.c

@@ -715,6 +715,7 @@ Gfx *bviewDrawFisheye(Gfx *gdl, u32 colour, u32 alpha, s32 shuttertime60, s8 sta
 
 #ifndef PLATFORM_N64
 	// make a copy of the current back buffer contents that we will be using as a texture
+	gDPFlushEXT(gdl++);
 	gDPCopyFramebufferEXT(gdl++, g_PrevFrameFb, 0, 0, 0, G_ON);
 	gDPSetFramebufferTextureEXT(gdl++, 0, 0, 0, g_PrevFrameFb);
 #endif
@@ -2659,6 +2660,7 @@ Gfx *bviewDrawHorizonScanner(Gfx *gdl)
 		return gdl;
 	}
 	// make a copy of what we have drawn so far and use it as a texture
+	gDPFlushEXT(gdl++);
 	gDPCopyFramebufferEXT(gdl++, g_PrevFrameFb, 0, 0, 0, G_ON);
 	gDPSetFramebufferTextureEXT(gdl++, 0, 0, 0, g_PrevFrameFb);
 #endif

src/include/gbiex.h

@@ -194,6 +194,7 @@
 #define G_SETINTENSITY_EXT      0x40
 #define G_COPYFB_EXT            0x41
 #define G_IMAGERECT_EXT         0x42
+#define G_RDPFLUSH_EXT          0x43
 
 /* G_EXTRAGEOMETRYMODE flags */
 
@@ -292,6 +293,8 @@
 #define gSPTextureRectangleEXT(p, xl, yl, xh, yh, tile, s, t, ds, dt) gSPTextureRectangleWideEXT(p, xl, yl, xh, yh, tile, s, t, ds, dt, G_OFF)
 #define gSPTextureRectangleFlipEXT(p, xl, yl, xh, yh, tile, s, t, ds, dt) gSPTextureRectangleWideEXT(p, xl, yl, xh, yh, tile, s, t, ds, dt, G_ON)
 
+#define gDPFlushEXT(pkt) gDPNoParam(pkt, G_RDPFLUSH_EXT)
+
 #undef gDPFillRectangleScaled
 #define gDPFillRectangleScaled(pkt, x1, y1, x2, y2) gDPFillRectangleEXT(pkt, (x1) * g_ScaleX, y1, (x2) * g_ScaleX, y2)