fix maths_inline version of mat4.rotate

res/modules/internal/maths_inline.lua

@@ -276,11 +276,9 @@ function mat4.rotate(...)
 
     angle = rad(angle)
 
-    local x = axis[1]
-    local y = axis[2]
-    local z = axis[3]
+    local x, y, z = axis[1], axis[2], axis[3]
 
-    local len = sqrt(x*x + y*y + z*z)
+    local len = sqrt(x * x + y * y + z * z)
     if len == 0 then
         error("rotation axis has zero length")
     end
@@ -293,39 +291,44 @@ function mat4.rotate(...)
     local s = sin(angle)
     local t = 1 - c
 
-    local r00 = t*x*x + c
-    local r01 = t*x*y - s*z
-    local r02 = t*x*z + s*y
+    local r00 = t * x * x + c
+    local r01 = t * x * y - s * z
+    local r02 = t * x * z + s * y
 
-    local r10 = t*x*y + s*z
-    local r11 = t*y*y + c
-    local r12 = t*y*z - s*x
+    local r10 = t * x * y + s * z
+    local r11 = t * y * y + c
+    local r12 = t * y * z - s * x
 
-    local r20 = t*x*z - s*y
-    local r21 = t*y*z + s*x
-    local r22 = t*z*z + c
+    local r20 = t * x * z - s * y
+    local r21 = t * y * z + s * x
+    local r22 = t * z * z + c
 
     local out = dst or {}
 
-    out[1] = matrix[1]*r00 + matrix[5]*r10 + matrix[9]*r20
-    out[2] = matrix[2]*r00 + matrix[6]*r10 + matrix[10]*r20
-    out[3] = matrix[3]*r00 + matrix[7]*r10 + matrix[11]*r20
-    out[4] = matrix[4]*r00 + matrix[8]*r10 + matrix[12]*r20
+    local m1,  m2,  m3,  m4  = matrix[1],  matrix[2],  matrix[3],  matrix[4]
+    local m5,  m6,  m7,  m8  = matrix[5],  matrix[6],  matrix[7],  matrix[8]
+    local m9,  m10, m11, m12 = matrix[9],  matrix[10], matrix[11], matrix[12]
+    local m13, m14, m15, m16 = matrix[13], matrix[14], matrix[15], matrix[16]
 
-    out[5] = matrix[1]*r01 + matrix[5]*r11 + matrix[9]*r21
-    out[6] = matrix[2]*r01 + matrix[6]*r11 + matrix[10]*r21
-    out[7] = matrix[3]*r01 + matrix[7]*r11 + matrix[11]*r21
-    out[8] = matrix[4]*r01 + matrix[8]*r11 + matrix[12]*r21
+    out[1]  = m1 * r00 + m5 * r10 + m9  * r20
+    out[2]  = m2 * r00 + m6 * r10 + m10 * r20
+    out[3]  = m3 * r00 + m7 * r10 + m11 * r20
+    out[4]  = m4 * r00 + m8 * r10 + m12 * r20
 
-    out[9]  = matrix[1]*r02 + matrix[5]*r12 + matrix[9]*r22
-    out[10] = matrix[2]*r02 + matrix[6]*r12 + matrix[10]*r22
-    out[11] = matrix[3]*r02 + matrix[7]*r12 + matrix[11]*r22
-    out[12] = matrix[4]*r02 + matrix[8]*r12 + matrix[12]*r22
+    out[5]  = m1 * r01 + m5 * r11 + m9  * r21
+    out[6]  = m2 * r01 + m6 * r11 + m10 * r21
+    out[7]  = m3 * r01 + m7 * r11 + m11 * r21
+    out[8]  = m4 * r01 + m8 * r11 + m12 * r21
 
-    out[13] = matrix[13]
-    out[14] = matrix[14]
-    out[15] = matrix[15]
-    out[16] = matrix[16]
+    out[9]  = m1 * r02 + m5 * r12 + m9  * r22
+    out[10] = m2 * r02 + m6 * r12 + m10 * r22
+    out[11] = m3 * r02 + m7 * r12 + m11 * r22
+    out[12] = m4 * r02 + m8 * r12 + m12 * r22
+
+    out[13] = m13
+    out[14] = m14
+    out[15] = m15
+    out[16] = m16
 
     return out
 end