mirror of
https://github.com/love2d/love.git
synced 2026-08-12 08:30:56 +02:00
Add love.graphics.transformPoint and love.graphics.inverseTransformPoint.
--HG-- branch : minor
This commit is contained in:
Alex Szpakowski
+168
-33
@@ -27,6 +27,43 @@
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namespace love
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{
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// | e0 e4 e8 e12 |
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// | e1 e5 e9 e13 |
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// | e2 e6 e10 e14 |
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// | e3 e7 e11 e15 |
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// | e0 e4 e8 e12 |
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// | e1 e5 e9 e13 |
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// | e2 e6 e10 e14 |
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// | e3 e7 e11 e15 |
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void Matrix4::multiply(const Matrix4 &a, const Matrix4 &b, float t[16])
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{
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t[0] = (a.e[0]*b.e[0]) + (a.e[4]*b.e[1]) + (a.e[8]*b.e[2]) + (a.e[12]*b.e[3]);
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t[4] = (a.e[0]*b.e[4]) + (a.e[4]*b.e[5]) + (a.e[8]*b.e[6]) + (a.e[12]*b.e[7]);
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t[8] = (a.e[0]*b.e[8]) + (a.e[4]*b.e[9]) + (a.e[8]*b.e[10]) + (a.e[12]*b.e[11]);
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t[12] = (a.e[0]*b.e[12]) + (a.e[4]*b.e[13]) + (a.e[8]*b.e[14]) + (a.e[12]*b.e[15]);
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t[1] = (a.e[1]*b.e[0]) + (a.e[5]*b.e[1]) + (a.e[9]*b.e[2]) + (a.e[13]*b.e[3]);
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t[5] = (a.e[1]*b.e[4]) + (a.e[5]*b.e[5]) + (a.e[9]*b.e[6]) + (a.e[13]*b.e[7]);
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t[9] = (a.e[1]*b.e[8]) + (a.e[5]*b.e[9]) + (a.e[9]*b.e[10]) + (a.e[13]*b.e[11]);
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t[13] = (a.e[1]*b.e[12]) + (a.e[5]*b.e[13]) + (a.e[9]*b.e[14]) + (a.e[13]*b.e[15]);
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t[2] = (a.e[2]*b.e[0]) + (a.e[6]*b.e[1]) + (a.e[10]*b.e[2]) + (a.e[14]*b.e[3]);
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t[6] = (a.e[2]*b.e[4]) + (a.e[6]*b.e[5]) + (a.e[10]*b.e[6]) + (a.e[14]*b.e[7]);
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t[10] = (a.e[2]*b.e[8]) + (a.e[6]*b.e[9]) + (a.e[10]*b.e[10]) + (a.e[14]*b.e[11]);
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t[14] = (a.e[2]*b.e[12]) + (a.e[6]*b.e[13]) + (a.e[10]*b.e[14]) + (a.e[14]*b.e[15]);
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t[3] = (a.e[3]*b.e[0]) + (a.e[7]*b.e[1]) + (a.e[11]*b.e[2]) + (a.e[15]*b.e[3]);
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t[7] = (a.e[3]*b.e[4]) + (a.e[7]*b.e[5]) + (a.e[11]*b.e[6]) + (a.e[15]*b.e[7]);
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t[11] = (a.e[3]*b.e[8]) + (a.e[7]*b.e[9]) + (a.e[11]*b.e[10]) + (a.e[15]*b.e[11]);
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t[15] = (a.e[3]*b.e[12]) + (a.e[7]*b.e[13]) + (a.e[11]*b.e[14]) + (a.e[15]*b.e[15]);
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}
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void Matrix4::multiply(const Matrix4 &a, const Matrix4 &b, Matrix4 &t)
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{
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multiply(a, b, t.e);
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}
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// | e0 e4 e8 e12 |
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// | e1 e5 e9 e13 |
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// | e2 e6 e10 e14 |
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@@ -46,46 +83,18 @@ Matrix4::~Matrix4()
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{
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}
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// | e0 e4 e8 e12 |
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// | e1 e5 e9 e13 |
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// | e2 e6 e10 e14 |
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// | e3 e7 e11 e15 |
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// | e0 e4 e8 e12 |
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// | e1 e5 e9 e13 |
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// | e2 e6 e10 e14 |
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// | e3 e7 e11 e15 |
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Matrix4 Matrix4::operator * (const Matrix4 &m) const
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{
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Matrix4 t;
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t.e[0] = (e[0]*m.e[0]) + (e[4]*m.e[1]) + (e[8]*m.e[2]) + (e[12]*m.e[3]);
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t.e[4] = (e[0]*m.e[4]) + (e[4]*m.e[5]) + (e[8]*m.e[6]) + (e[12]*m.e[7]);
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t.e[8] = (e[0]*m.e[8]) + (e[4]*m.e[9]) + (e[8]*m.e[10]) + (e[12]*m.e[11]);
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t.e[12] = (e[0]*m.e[12]) + (e[4]*m.e[13]) + (e[8]*m.e[14]) + (e[12]*m.e[15]);
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t.e[1] = (e[1]*m.e[0]) + (e[5]*m.e[1]) + (e[9]*m.e[2]) + (e[13]*m.e[3]);
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t.e[5] = (e[1]*m.e[4]) + (e[5]*m.e[5]) + (e[9]*m.e[6]) + (e[13]*m.e[7]);
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t.e[9] = (e[1]*m.e[8]) + (e[5]*m.e[9]) + (e[9]*m.e[10]) + (e[13]*m.e[11]);
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t.e[13] = (e[1]*m.e[12]) + (e[5]*m.e[13]) + (e[9]*m.e[14]) + (e[13]*m.e[15]);
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t.e[2] = (e[2]*m.e[0]) + (e[6]*m.e[1]) + (e[10]*m.e[2]) + (e[14]*m.e[3]);
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t.e[6] = (e[2]*m.e[4]) + (e[6]*m.e[5]) + (e[10]*m.e[6]) + (e[14]*m.e[7]);
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t.e[10] = (e[2]*m.e[8]) + (e[6]*m.e[9]) + (e[10]*m.e[10]) + (e[14]*m.e[11]);
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t.e[14] = (e[2]*m.e[12]) + (e[6]*m.e[13]) + (e[10]*m.e[14]) + (e[14]*m.e[15]);
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t.e[3] = (e[3]*m.e[0]) + (e[7]*m.e[1]) + (e[11]*m.e[2]) + (e[15]*m.e[3]);
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t.e[7] = (e[3]*m.e[4]) + (e[7]*m.e[5]) + (e[11]*m.e[6]) + (e[15]*m.e[7]);
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t.e[11] = (e[3]*m.e[8]) + (e[7]*m.e[9]) + (e[11]*m.e[10]) + (e[15]*m.e[11]);
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t.e[15] = (e[3]*m.e[12]) + (e[7]*m.e[13]) + (e[11]*m.e[14]) + (e[15]*m.e[15]);
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multiply(*this, m, t);
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return t;
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}
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void Matrix4::operator *= (const Matrix4 &m)
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{
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Matrix4 t = (*this) * m;
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memcpy(this->e, t.e, sizeof(float)*16);
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float t[16];
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multiply(*this, m, t);
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memcpy(this->e, t, sizeof(float)*16);
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}
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const float *Matrix4::getElements() const
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@@ -96,7 +105,7 @@ const float *Matrix4::getElements() const
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void Matrix4::setIdentity()
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{
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memset(e, 0, sizeof(float)*16);
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e[0] = e[5] = e[10] = e[15] = 1;
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e[15] = e[10] = e[5] = e[0] = 1;
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}
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void Matrix4::setTranslation(float x, float y)
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@@ -177,6 +186,132 @@ void Matrix4::shear(float kx, float ky)
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this->operator *=(t);
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}
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Matrix4 Matrix4::inverse() const
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{
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Matrix4 inv;
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inv.e[0] = e[5] * e[10] * e[15] -
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e[5] * e[11] * e[14] -
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e[9] * e[6] * e[15] +
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e[9] * e[7] * e[14] +
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e[13] * e[6] * e[11] -
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e[13] * e[7] * e[10];
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inv.e[4] = -e[4] * e[10] * e[15] +
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e[4] * e[11] * e[14] +
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e[8] * e[6] * e[15] -
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e[8] * e[7] * e[14] -
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e[12] * e[6] * e[11] +
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e[12] * e[7] * e[10];
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inv.e[8] = e[4] * e[9] * e[15] -
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e[4] * e[11] * e[13] -
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e[8] * e[5] * e[15] +
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e[8] * e[7] * e[13] +
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e[12] * e[5] * e[11] -
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e[12] * e[7] * e[9];
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inv.e[12] = -e[4] * e[9] * e[14] +
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e[4] * e[10] * e[13] +
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e[8] * e[5] * e[14] -
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e[8] * e[6] * e[13] -
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e[12] * e[5] * e[10] +
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e[12] * e[6] * e[9];
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inv.e[1] = -e[1] * e[10] * e[15] +
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e[1] * e[11] * e[14] +
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e[9] * e[2] * e[15] -
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e[9] * e[3] * e[14] -
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e[13] * e[2] * e[11] +
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e[13] * e[3] * e[10];
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inv.e[5] = e[0] * e[10] * e[15] -
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e[0] * e[11] * e[14] -
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e[8] * e[2] * e[15] +
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e[8] * e[3] * e[14] +
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e[12] * e[2] * e[11] -
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e[12] * e[3] * e[10];
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inv.e[9] = -e[0] * e[9] * e[15] +
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e[0] * e[11] * e[13] +
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e[8] * e[1] * e[15] -
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e[8] * e[3] * e[13] -
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e[12] * e[1] * e[11] +
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e[12] * e[3] * e[9];
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inv.e[13] = e[0] * e[9] * e[14] -
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e[0] * e[10] * e[13] -
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e[8] * e[1] * e[14] +
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e[8] * e[2] * e[13] +
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e[12] * e[1] * e[10] -
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e[12] * e[2] * e[9];
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inv.e[2] = e[1] * e[6] * e[15] -
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e[1] * e[7] * e[14] -
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e[5] * e[2] * e[15] +
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e[5] * e[3] * e[14] +
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e[13] * e[2] * e[7] -
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e[13] * e[3] * e[6];
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inv.e[6] = -e[0] * e[6] * e[15] +
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e[0] * e[7] * e[14] +
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e[4] * e[2] * e[15] -
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e[4] * e[3] * e[14] -
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e[12] * e[2] * e[7] +
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e[12] * e[3] * e[6];
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inv.e[10] = e[0] * e[5] * e[15] -
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e[0] * e[7] * e[13] -
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e[4] * e[1] * e[15] +
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e[4] * e[3] * e[13] +
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e[12] * e[1] * e[7] -
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e[12] * e[3] * e[5];
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inv.e[14] = -e[0] * e[5] * e[14] +
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e[0] * e[6] * e[13] +
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e[4] * e[1] * e[14] -
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e[4] * e[2] * e[13] -
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e[12] * e[1] * e[6] +
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e[12] * e[2] * e[5];
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inv.e[3] = -e[1] * e[6] * e[11] +
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e[1] * e[7] * e[10] +
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e[5] * e[2] * e[11] -
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e[5] * e[3] * e[10] -
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e[9] * e[2] * e[7] +
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e[9] * e[3] * e[6];
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inv.e[7] = e[0] * e[6] * e[11] -
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e[0] * e[7] * e[10] -
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e[4] * e[2] * e[11] +
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e[4] * e[3] * e[10] +
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e[8] * e[2] * e[7] -
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e[8] * e[3] * e[6];
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inv.e[11] = -e[0] * e[5] * e[11] +
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e[0] * e[7] * e[9] +
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e[4] * e[1] * e[11] -
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e[4] * e[3] * e[9] -
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e[8] * e[1] * e[7] +
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e[8] * e[3] * e[5];
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inv.e[15] = e[0] * e[5] * e[10] -
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e[0] * e[6] * e[9] -
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e[4] * e[1] * e[10] +
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e[4] * e[2] * e[9] +
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e[8] * e[1] * e[6] -
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e[8] * e[2] * e[5];
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float det = e[0] * inv.e[0] + e[1] * inv.e[4] + e[2] * inv.e[8] + e[3] * inv.e[12];
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float invdet = 1.0f / det;
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for (int i = 0; i < 16; i++)
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inv.e[i] *= invdet;
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return inv;
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}
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Matrix4 Matrix4::ortho(float left, float right, float bottom, float top)
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{
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Matrix4 m;
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