Add new mesh data formats: int32, uint32, [u]int8, [u]int16, snorm8, and snorm16.

Integer formats for vertex attributes are only supported in glsl3 shaders. They use ivec/uvec types in glsl.

--HG--
branch : minor

src/common/runtime.h

@@ -214,6 +214,16 @@ inline float luax_checkfloat(lua_State *L, int idx)
 	return static_cast<float>(luaL_checknumber(L, idx));
 }
 
+inline lua_Number luax_checknumberclamped(lua_State *L, int idx, double minv, double maxv)
+{
+	return std::min(std::max(luaL_checknumber(L, idx), minv), maxv);
+}
+
+inline lua_Number luax_optnumberclamped(lua_State *L, int idx, double minv, double maxv, double def)
+{
+	return std::min(std::max(luaL_optnumber(L, idx, def), minv), maxv);
+}
+
 inline lua_Number luax_checknumberclamped01(lua_State *L, int idx)
 {
 	return std::min(std::max(luaL_checknumber(L, idx), 0.0), 1.0);