diff options
author | Matthew Kosarek <mattkae@protonmail.com> | 2021-05-16 19:50:15 -0400 |
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committer | Matthew Kosarek <mattkae@protonmail.com> | 2021-05-16 19:50:15 -0400 |
commit | a00c0aab1eb5a7a55bef8ca08115bdd722ab5699 (patch) | |
tree | 45b5c4cc8c380d0630a8e0185af7229f26dc754a /_shared/math/mat4.js | |
parent | 4941a1874b6ca9d142d94df70b2aec5e0b35b94e (diff) |
Moved the frontend directory up so that it no longer exists
Diffstat (limited to '_shared/math/mat4.js')
-rw-r--r-- | _shared/math/mat4.js | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/_shared/math/mat4.js b/_shared/math/mat4.js new file mode 100644 index 0000000..d31a20e --- /dev/null +++ b/_shared/math/mat4.js @@ -0,0 +1,63 @@ +function mat4() { + return [ + 1, 0, 0, 0, + 0, 1, 0, 0, + 0, 0, 1, 0, + 0, 0, 0, 1 + ] +} + +function orthographic(pLeft, pRight, pBottom, pTop) { + const lResult = mat4(); + lResult[0] = 2.0 / (pRight - pLeft); + lResult[5] = 2.0 / (pTop - pBottom); + lResult[10] = 1.0; + lResult[12] = -(pRight + pLeft) / (pRight - pLeft); + lResult[13] = -(pTop + pBottom) / (pTop - pBottom); + return lResult; +} + +function translateMatrix(m, x, y, z) { + m = [...m]; + m[12] += x; + m[13] += y; + m[14] += z; + return m; +} + +function rotateMatrix2d(m, angle) { + m = [...m]; + m[0] = Math.cos(angle); + m[1] = -Math.sin(angle); + m[4] = Math.sin(angle); + m[5] = Math.cos(angle); + return m; +} + +function scaleMatrix(m, x, y, z) { + m = [...m]; + m[0] = m[0] * x; + m[5] = m[5] * y; + m[10] = m[10] * z; + return m; +} + +function multMat4ByVec2(matrix, vec) { + var lInnerVec = {...vec}; + lInnerVec.z = 0.0; + lInnerVec.w = 1.0; + + return { + x: lInnerVec.x * matrix[0] + lInnerVec.y * matrix[4] + lInnerVec.z * matrix[8] + lInnerVec.w * matrix[12], + y: lInnerVec.x * matrix[1] + lInnerVec.y * matrix[5] + lInnerVec.z * matrix[9] + lInnerVec.w * matrix[13] + }; +} + +function multMat4ByVec4(matrix, vec) { + return { + x: vec.x * matrix[0] + vec.y * matrix[4] + vec.z * matrix[8] + vec.w * matrix[12], + y: vec.x * matrix[1] + vec.y * matrix[5] + vec.z * matrix[9] + vec.w * matrix[13], + z: vec.x * matrix[2] + vec.y * matrix[6] + vec.z * matrix[10] + vec.w * matrix[14], + w: vec.x * matrix[3] + vec.y * matrix[7] + vec.z * matrix[11] + vec.w * matrix[15] + }; +}
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