Expose MultMatrix

[rocktavious]

This adds the MultMatrix with is in raylib core so you can easily setup rendering matrix instead of having to make several calls to Translatef and Rotatef and Scalef.

[rocktavious]

I have tested this in my project and it works properly.

[gen2brain]

Can you please also add that function to rlgl_purego.go

[JupiterRider]

@gen2brain
Is our MatrixToFloat implementation correct?
There is also MatrixToFloatV.

// MatrixToFloatV - Get float array of matrix data
func MatrixToFloatV(mat Matrix) [16]float32 {
	var result [16]float32

	result[0] = mat.M0
	result[1] = mat.M1
	result[2] = mat.M2
	result[3] = mat.M3
	result[4] = mat.M4
	result[5] = mat.M5
	result[6] = mat.M6
	result[7] = mat.M7
	result[8] = mat.M8
	result[9] = mat.M9
	result[10] = mat.M10
	result[11] = mat.M11
	result[12] = mat.M12
	result[13] = mat.M13
	result[14] = mat.M14
	result[15] = mat.M15

	return result
}

// MatrixToFloat - Converts Matrix to float32 slice
func MatrixToFloat(mat Matrix) []float32 {
	data := make([]float32, 16)

	data[0] = mat.M0
	data[1] = mat.M4
	data[2] = mat.M8
	data[3] = mat.M12
	data[4] = mat.M1
	data[5] = mat.M5
	data[6] = mat.M9
	data[7] = mat.M13
	data[8] = mat.M2
	data[9] = mat.M6
	data[10] = mat.M10
	data[11] = mat.M14
	data[12] = mat.M3
	data[13] = mat.M7
	data[14] = mat.M11
	data[15] = mat.M15

	return data
}

C-raylib:

#ifndef MatrixToFloat
    #define MatrixToFloat(mat) (MatrixToFloatV(mat).v)
#endif

RMAPI float16 MatrixToFloatV(Matrix mat)
{
    float16 result = { 0 };

    result.v[0] = mat.m0;
    result.v[1] = mat.m1;
    result.v[2] = mat.m2;
    result.v[3] = mat.m3;
    result.v[4] = mat.m4;
    result.v[5] = mat.m5;
    result.v[6] = mat.m6;
    result.v[7] = mat.m7;
    result.v[8] = mat.m8;
    result.v[9] = mat.m9;
    result.v[10] = mat.m10;
    result.v[11] = mat.m11;
    result.v[12] = mat.m12;
    result.v[13] = mat.m13;
    result.v[14] = mat.m14;
    result.v[15] = mat.m15;

    return result;
}

[gen2brain]

@JupiterRider Sorry, I don't remember what happened there.

[JupiterRider]

I fixed it in #390 as well

[rocktavious]

Thanks @JupiterRider and @gen2brain - should be good now.