Add integer posmod and rename default arg names

"posmod" is the integer version of "fposmod". We do not need a "mod" because of the % operator.

I changed the default arg names from "x" and "y" to "a" and "b" because they are not coordinates. I also changed pow's arg names to "base" and "exp". Also, I reorganized the code in the VS built-in funcs switch statement.

modules/gdscript/doc_classes/@GDScript.xml

@@ -345,45 +345,78 @@
 		<method name="fmod">
 			<return type="float">
 			</return>
-			<argument index="0" name="x" type="float">
+			<argument index="0" name="a" type="float">
 			</argument>
-			<argument index="1" name="y" type="float">
+			<argument index="1" name="b" type="float">
 			</argument>
 			<description>
-				Returns the floating-point remainder of [code]x/y[/code].
+				Returns the floating-point remainder of [code]a/b[/code], keeping the sign of [code]a[/code].
 				[codeblock]
 				# Remainder is 1.5
 				var remainder = fmod(7, 5.5)
 				[/codeblock]
+				For the integer remainder operation, use the % operator.
 			</description>
 		</method>
 		<method name="fposmod">
 			<return type="float">
 			</return>
-			<argument index="0" name="x" type="float">
+			<argument index="0" name="a" type="float">
 			</argument>
-			<argument index="1" name="y" type="float">
+			<argument index="1" name="b" type="float">
 			</argument>
 			<description>
-				Returns the floating-point remainder of [code]x/y[/code] that wraps equally in positive and negative.
+				Returns the floating-point modulus of [code]a/b[/code] that wraps equally in positive and negative.
 				[codeblock]
-				var i = -10
-				while i &lt; 0:
-				    prints(i, fposmod(i, 10))
+				var i = -6
+				while i &lt; 5:
+				    prints(i, fposmod(i, 3))
 				    i += 1
 				[/codeblock]
 				Produces:
 				[codeblock]
-				-10 10
-				-9 1
-				-8 2
-				-7 3
-				-6 4
-				-5 5
-				-4 6
-				-3 7
-				-2 8
-				-1 9
+				-6 0
+				-5 1
+				-4 2
+				-3 0
+				-2 1
+				-1 2
+				0 0
+				1 1
+				2 2
+				3 0
+				4 1
+				[/codeblock]
+			</description>
+		</method>
+		<method name="posmod">
+			<return type="int">
+			</return>
+			<argument index="0" name="a" type="int">
+			</argument>
+			<argument index="1" name="b" type="int">
+			</argument>
+			<description>
+				Returns the integer modulus of [code]a/b[/code] that wraps equally in positive and negative.
+				[codeblock]
+				var i = -6
+				while i &lt; 5:
+				    prints(i, posmod(i, 3))
+				    i += 1
+				[/codeblock]
+				Produces:
+				[codeblock]
+				-6 0
+				-5 1
+				-4 2
+				-3 0
+				-2 1
+				-1 2
+				0 0
+				1 1
+				2 2
+				3 0
+				4 1
 				[/codeblock]
 			</description>
 		</method>

modules/gdscript/gdscript_functions.cpp

@@ -58,6 +58,7 @@ const char *GDScriptFunctions::get_func_name(Function p_func) {
 		"sqrt",
 		"fmod",
 		"fposmod",
+		"posmod",
 		"floor",
 		"ceil",
 		"round",
@@ -243,6 +244,12 @@ void GDScriptFunctions::call(Function p_func, const Variant **p_args, int p_arg_
 			VALIDATE_ARG_NUM(1);
 			r_ret = Math::fposmod((double)*p_args[0], (double)*p_args[1]);
 		} break;
+		case MATH_POSMOD: {
+			VALIDATE_ARG_COUNT(2);
+			VALIDATE_ARG_NUM(0);
+			VALIDATE_ARG_NUM(1);
+			r_ret = Math::posmod((int)*p_args[0], (int)*p_args[1]);
+		} break;
 		case MATH_FLOOR: {
 			VALIDATE_ARG_COUNT(1);
 			VALIDATE_ARG_NUM(0);
@@ -1456,6 +1463,7 @@ bool GDScriptFunctions::is_deterministic(Function p_func) {
 		case MATH_SQRT:
 		case MATH_FMOD:
 		case MATH_FPOSMOD:
+		case MATH_POSMOD:
 		case MATH_FLOOR:
 		case MATH_CEIL:
 		case MATH_ROUND:
@@ -1568,15 +1576,20 @@ MethodInfo GDScriptFunctions::get_info(Function p_func) {
 			return mi;
 		} break;
 		case MATH_FMOD: {
-			MethodInfo mi("fmod", PropertyInfo(Variant::REAL, "x"), PropertyInfo(Variant::REAL, "y"));
+			MethodInfo mi("fmod", PropertyInfo(Variant::REAL, "a"), PropertyInfo(Variant::REAL, "b"));
 			mi.return_val.type = Variant::REAL;
 			return mi;
 		} break;
 		case MATH_FPOSMOD: {
-			MethodInfo mi("fposmod", PropertyInfo(Variant::REAL, "x"), PropertyInfo(Variant::REAL, "y"));
+			MethodInfo mi("fposmod", PropertyInfo(Variant::REAL, "a"), PropertyInfo(Variant::REAL, "b"));
 			mi.return_val.type = Variant::REAL;
 			return mi;
 		} break;
+		case MATH_POSMOD: {
+			MethodInfo mi("posmod", PropertyInfo(Variant::INT, "a"), PropertyInfo(Variant::INT, "b"));
+			mi.return_val.type = Variant::INT;
+			return mi;
+		} break;
 		case MATH_FLOOR: {
 			MethodInfo mi("floor", PropertyInfo(Variant::REAL, "s"));
 			mi.return_val.type = Variant::REAL;
@@ -1603,7 +1616,7 @@ MethodInfo GDScriptFunctions::get_info(Function p_func) {
 			return mi;
 		} break;
 		case MATH_POW: {
-			MethodInfo mi("pow", PropertyInfo(Variant::REAL, "x"), PropertyInfo(Variant::REAL, "y"));
+			MethodInfo mi("pow", PropertyInfo(Variant::REAL, "base"), PropertyInfo(Variant::REAL, "exp"));
 			mi.return_val.type = Variant::REAL;
 			return mi;
 		} break;

modules/gdscript/gdscript_functions.h

@@ -49,6 +49,7 @@ public:
 		MATH_SQRT,
 		MATH_FMOD,
 		MATH_FPOSMOD,
+		MATH_POSMOD,
 		MATH_FLOOR,
 		MATH_CEIL,
 		MATH_ROUND,