Add geometry mode for forcing branch execution (#605)

include/libultraship/libultra/gbi.h

@@ -368,6 +368,7 @@
  * G_EXTRAGEOMETRY flags: set extra custom geometry modes
  */
 #define G_EX_INVERT_CULLING 0x00000001
+#define G_EX_ALWAYS_EXECUTE_BRANCH 0x00000002
 
 /* Need these defined for Sprite Microcode */
 #ifdef _LANGUAGE_ASSEMBLY

src/graphic/Fast3D/gfx_pc.cpp

@@ -3035,7 +3035,7 @@ bool gfx_branch_z_otr_handler_f3dex2(F3DGfx** cmd0) {
 
     (*cmd0)++;
 
-    if (g_rsp.loaded_vertices[vbidx].z <= zval) {
+    if (g_rsp.loaded_vertices[vbidx].z <= zval || (g_rsp.extra_geometry_mode & G_EX_ALWAYS_EXECUTE_BRANCH) != 0) {
         uint64_t hash = ((uint64_t)(*cmd0)->words.w0 << 32) + (*cmd0)->words.w1;
 
         F3DGfx* gfx = (F3DGfx*)ResourceGetDataByCrc(hash);

src/graphic/Fast3D/lus_gbi.h

@@ -196,6 +196,7 @@ constexpr int8_t OTR_G_SETINTENSITY = OPCODE(0x40);
  * G_EXTRAGEOMETRY flags: set extra custom geometry modes
  */
 #define G_EX_INVERT_CULLING 0x00000001
+#define G_EX_ALWAYS_EXECUTE_BRANCH 0x00000002
 
 /*
  * G_SETIMG fmt: set image formats