d3dx9: Add 'div' preshader opcode.

dlls/d3dx9_36/preshader.c

@@ -47,6 +47,7 @@ enum pres_ops
     PRESHADER_OP_ADD,
     PRESHADER_OP_MUL,
     PRESHADER_OP_ATAN2,
+    PRESHADER_OP_DIV,
     PRESHADER_OP_CMP,
     PRESHADER_OP_DOT,
     PRESHADER_OP_DOTSWIZ6,
@@ -134,6 +135,10 @@ static double pres_acos(double *args, int n) {return to_signed_nan(acos(args[0])
 static double pres_atan(double *args, int n) {return atan(args[0]);}
 static double pres_atan2(double *args, int n) {return atan2(args[0], args[1]);}
 
+/* According to the test results 'div' operation always returns 0. Compiler does not seem to ever
+ * generate it, using rcp + mul instead, so probably it is not implemented in native d3dx. */
+static double pres_div(double *args, int n) {return 0.0;}
+
 #define PRES_OPCODE_MASK 0x7ff00000
 #define PRES_OPCODE_SHIFT 20
 #define PRES_SCALAR_FLAG 0x80000000
@@ -176,6 +181,7 @@ static const struct op_info pres_op_info[] =
     {0x204, "add", 2, 0, pres_add}, /* PRESHADER_OP_ADD */
     {0x205, "mul", 2, 0, pres_mul}, /* PRESHADER_OP_MUL */
     {0x206, "atan2", 2, 0, pres_atan2}, /* PRESHADER_OP_ATAN2 */
+    {0x208, "div", 2, 0, pres_div}, /* PRESHADER_OP_DIV */
     {0x300, "cmp", 3, 0, pres_cmp}, /* PRESHADER_OP_CMP */
     {0x500, "dot", 2, 1, pres_dot}, /* PRESHADER_OP_DOT */
     {0x70e, "d3ds_dotswiz", 6, 0, pres_dotswiz6}, /* PRESHADER_OP_DOTSWIZ6 */

dlls/d3dx9_36/tests/effect.c

@@ -4566,6 +4566,8 @@ static void test_effect_preshader_ops(IDirect3DDevice9 *device)
                 {-0.3f, 0.0f, -0.0f, NAN}, {0.0f, -0.0f, 0.0f, 1.0f}},
         {"atan2 test #2", 0x20600004, 2, {0xbfc90fdb, 0, 0xc0490fdb, 0},
                 {-0.3f, 0.0f, -0.0f, -0.0f}, {-0.0f, 0.0f, -0.0f, 1.0f}},
+        {"div", 0x20800004, 2, {0, 0, 0, 0},
+                {-0.3f, 0.0f, -2.2f, NAN}, {0.0f, -0.0f, -3.0f, 1.0f}},
         {"0 * INF", 0x20500004, 2, {0xffc00000, 0xffc00000, 0xc0d33334, 0x7f800000},
                 {0.0f, -0.0f, -2.2f, 3.402823466e+38f}, {INFINITY, INFINITY, 3.0f, 4.0f}},
     };