[Glide64] Sync Glide64/DepthBufferRender.cpp

Source/Glide64/DepthBufferRender.cpp

@@ -85,34 +85,44 @@ static int right_height, left_height;
 static int right_x, right_dxdy, left_x, left_dxdy;
 static int left_z, left_dzdy;
 
-int imul16(int x, int y)
+__inline int imul16(int x, int y)        // (x * y) >> 16
 {
-    int64_t result;
-    const int64_t m = (int64_t)(x);
-    const int64_t n = (int64_t)(y);
-
-    result = (m * n) >> 16;
-    return (int)(result);
+    return (((long long)x) * ((long long)y)) >> 16;
 }
 
-int imul14(int x, int y)
+__inline int imul14(int x, int y)        // (x * y) >> 14
 {
-    int64_t result;
-    const int64_t m = (int64_t)(x);
-    const int64_t n = (int64_t)(y);
-
-    result = (m * n) >> 14;
-    return (int)(result);
+    return (((long long)x) * ((long long)y)) >> 14;
 }
 
-int idiv16(int x, int y)
+__inline int idiv16(int x, int y)        // (x << 16) / y
 {
-    int64_t result;
-    const int64_t m = (int64_t)(x);
-    const int64_t n = (int64_t)(y);
-
-    result = (m << 16) / n;
-    return (int)(result);
+    //x = (((long long)x) << 16) / ((long long)y);
+ /*   
+  eax = x;
+  ebx = y;
+  edx = x;
+  (x << 16) | ()
+   */ 
+#if !defined(__GNUC__) && !defined(NO_ASM)
+  __asm {
+        mov   eax, x
+        mov   ebx, y
+        mov   edx,eax   
+        sar   edx,16
+        shl   eax,16    
+        idiv  ebx  
+        mov   x, eax
+    }
+#elif !defined(NO_ASM)
+    int reminder;
+    asm ("idivl %[divisor]"
+          : "=a" (x), "=d" (reminder)
+          : [divisor] "g" (y), "d" (x >> 16), "a" (x << 16));
+#else
+	x = (((long long)x) << 16) / ((long long)y);
+#endif
+    return x;
 }
 
 __inline int iceil(int x)
@@ -121,7 +131,7 @@ __inline int iceil(int x)
   return (x >> 16);
 }
 
-void RightSection(void)
+static void RightSection(void)
 {
   // Walk backwards trough the vertex array