gg.m4: fix a bug on translate, remove abs fn (#9224)

vlib/gg/m4/m4_test.v

@@ -192,10 +192,10 @@ fn test_vec4() {
 	assert v + m4.Vec4{ e: [f32(5), 6, 7, 8]! } == m4.Vec4{ e: [f32(6), 8, 10, 12]! }
 	assert v - m4.Vec4{ e: [f32(1), 2, 3, 4]! } == m4.Vec4{ e: [f32(0), 0, 0, 0]! }
 	assert v.mul_vec4(m4.Vec4{ e: [f32(2), 2, 2, 2]! }) == m4.Vec4{	e: [f32(2), 4, 6, 8]! }
-	assert m4.abs(v.normalize().mod() - 1) < m4.precision
+	assert f32_abs(v.normalize().mod() - 1) < m4.precision
 	v = m4.Vec4{[f32(1), 2, 3, 0]!}
-	assert m4.abs(v.normalize3().mod3() - 1) < m4.precision
-	assert m4.abs(v.normalize3().mod() - 1) < m4.precision
+	assert f32_abs(v.normalize3().mod3() - 1) < m4.precision
+	assert f32_abs(v.normalize3().mod() - 1) < m4.precision
 	// cross product
 	// x y z
 	// 1 2 3 ==> -3 6 -3 0

vlib/gg/m4/matrix.v

@@ -27,14 +27,6 @@ pub const precision = f32(10e-7)
 * Utility
 *
 *********************************************************************/
-pub fn abs(a f32) f32 {
-	if a >= f32(0.0) {
-		return a
-	} else {
-		return -a
-	}
-}
-
 // String representation of the matrix
 pub fn (x Mat4) str() string {
 	unsafe {
@@ -51,7 +43,7 @@ pub fn (a Mat4) clean() Mat4 {
 	unsafe {
 		x := Mat4{}
 		for c, value in a.e {
-			if abs(value) < m4.precision {
+			if f32_abs(value) < m4.precision {
 				x.e[c] = 0
 			} else {
 				x.e[c] = value
@@ -75,7 +67,7 @@ pub fn (x Mat4) sum_all() f32 {
 pub fn (x Mat4) is_equal(y Mat4) bool {
 	unsafe {
 		for c, value in x.e {
-			if abs(value - y.e[c]) > m4.precision {
+			if f32_abs(value - y.e[c]) > m4.precision {
 				return false
 			}
 		}
@@ -163,7 +155,7 @@ pub fn (mut x Mat4) set_f32(value f32) {
 [unsafe]
 pub fn (mut x Mat4) set_row(row int, v3 Vec4) {
 	unsafe {
-		x.e[row * 4] = v3.e[0]
+		x.e[row * 4 + 0] = v3.e[0]
 		x.e[row * 4 + 1] = v3.e[1]
 		x.e[row * 4 + 2] = v3.e[2]
 		x.e[row * 4 + 3] = v3.e[3]
@@ -177,7 +169,7 @@ pub fn (x Mat4) get_row(row int) Vec4 {
 	unsafe {
 		return Vec4{
 			e: [
-				x.e[row * 4],
+				x.e[row * 4 + 0],
 				x.e[row * 4 + 1],
 				x.e[row * 4 + 2],
 				x.e[row * 4 + 3],
@@ -241,17 +233,17 @@ pub fn (mut x Mat4) swap_col(col1 int, col2 int) {
 [unsafe]
 pub fn (mut x Mat4) swap_row(row1 int, row2 int) {
 	unsafe {
-		v0 := x.e[row1 * 4]
+		v0 := x.e[row1 * 4 + 0]
 		v1 := x.e[row1 * 4 + 1]
 		v2 := x.e[row1 * 4 + 2]
 		v3 := x.e[row1 * 4 + 3]
 
-		x.e[row1 * 4] = x.e[row2 * 4]
+		x.e[row1 * 4 + 0] = x.e[row2 * 4 + 0]
 		x.e[row1 * 4 + 1] = x.e[row2 * 4 + 1]
 		x.e[row1 * 4 + 2] = x.e[row2 * 4 + 2]
 		x.e[row1 * 4 + 3] = x.e[row2 * 4 + 3]
 
-		x.e[row2 * 4] = v0
+		x.e[row2 * 4 + 0] = v0
 		x.e[row2 * 4 + 1] = v1
 		x.e[row2 * 4 + 2] = v2
 		x.e[row2 * 4 + 3] = v3
@@ -410,15 +402,6 @@ pub fn mul(a Mat4, b Mat4) Mat4 {
 // Multiply a Matrix by a vector
 pub fn mul_vec(a Mat4, v Vec4) Vec4 {
 	unsafe {
-/*
-		return Vec4{ e: [
-				a.e[0] * v.e[0] + a.e[4] * v.e[1] + a.e[8] * v.e[2] + a.e[12] * v.e[3],
-				a.e[1] * v.e[0] + a.e[5] * v.e[1] + a.e[9] * v.e[2] + a.e[13] * v.e[3],
-				a.e[2] * v.e[0] + a.e[6] * v.e[1] + a.e[10] * v.e[2] + a.e[14] * v.e[3],
-				a.e[3] * v.e[0] + a.e[7] * v.e[1] + a.e[11] * v.e[2] + a.e[15] * v.e[3],
-				]!
-		}
-*/
 		return Vec4{ e: [
 				a.e[0 ] * v.e[0] + a.e[1 ] * v.e[1] + a.e[2 ] * v.e[2] + a.e[3 ] * v.e[3],
 				a.e[4 ] * v.e[0] + a.e[5 ] * v.e[1] + a.e[6 ] * v.e[2] + a.e[7 ] * v.e[3],
@@ -589,10 +572,10 @@ pub fn rotate(angle f32, w Vec4) Mat4 {
 pub fn (x Mat4) translate(w Vec4) Mat4 {
 	unsafe {
 		return Mat4{ e: [
-				x.e[0],		x.e[1], 	x.e[2], 	x.e[3]  + w.e[0],
-				x.e[4], 	x.e[5],		x.e[6], 	x.e[7]  + w.e[1],
-				x.e[8], 	x.e[9], 	x.e[10], 	x.e[11] + w.e[2],
-				x.e[12], 	x.e[13],  	x.e[14], 	x.e[15],
+				x.e[0],	x.e[1], x.e[2 ], 	x.e[3 ] ,
+				x.e[4], x.e[5],	x.e[6 ], 	x.e[7 ] ,
+				x.e[8], x.e[9], x.e[10], 	x.e[11] ,
+				x.e[12] + w.e[0], 	x.e[13] + w.e[1], x.e[14] + w.e[2], x.e[15],
 				]!
 		}
 	}

vlib/gg/m4/vector.v

@@ -36,7 +36,7 @@ pub fn vec3(x f32, y f32, z f32) Vec4 {
 pub fn (a Vec4) clean() Vec4 {
 	mut x := Vec4{}
 	for c, value in a.e {
-		if abs(value) < precision {
+		if f32_abs(value) < precision {
 			x.e[c] = 0
 		} else {
 			x.e[c] = value