98 lines
1.8 KiB
C++
98 lines
1.8 KiB
C++
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#include <cstdlib>
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#include <Spectre/Math/Math.h>
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namespace sp { namespace math
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{
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float rand(float min, float max) {
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float r = ((float) ::rand()) / RAND_MAX;
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return ((max - min) * r) + min;
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}
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float deg2rad(float deg) {
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return deg * 3.141592654f / 180.0f;
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}
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unsigned int nextPowerOfTwo(unsigned int value) {
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if (value == 0) {
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return 1;
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}
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unsigned int exp = static_cast<unsigned int>(::ceil(log2(value)));
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return ::pow(2.0f, exp);
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}
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Matrix4f orthoProjection(float left, float right,
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float bottom, float top,
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float zNear, float zFar) {
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float rl = (right - left),
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tb = (top - bottom),
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fn = (zFar - zNear),
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rl2 = 2.0f / rl,
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tb2 = 2.0f / tb,
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fn2 = 2.0f / fn,
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x = (right + left) / rl,
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y = (top + bottom) / tb,
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z = (zFar + zNear) / fn;
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return Matrix4f(
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rl2 , 0.0f, 0.0f, -x,
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0.0f, tb2 , 0.0f, -y,
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0.0f, 0.0f, -fn2, -z,
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0.0f, 0.0f, 0.0f, 1.0f
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);
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}
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Matrix4f rotation(float theta) {
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float r = deg2rad(theta);
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float s = ::std::sin(r);
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float c = ::std::cos(r);
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return Matrix4f(
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c, -s, 0.0f, 0.0f,
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s, c, 0.0f, 0.0f,
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0.0f, 0.0f, 1.0f, 0.0f,
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0.0f, 0.0f, 0.0f, 1.0f);
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}
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Matrix4f translate(float x, float y) {
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return Matrix4f(
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1.0f, 0.0f, 0.0f, x,
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0.0f, 1.0f, 0.0f, y,
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0.0f, 0.0f, 1.0f, 0.0f,
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0.0f, 0.0f, 0.0f, 1.0f);
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}
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Matrix4f scale(float x, float y) {
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return Matrix4f(
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x , 0.0f, 0.0f, 0.0f,
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0.0f, y , 0.0f, 0.0f,
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0.0f, 0.0f, 1.0f, 0.0f,
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0.0f, 0.0f, 0.0f, 1.0f);
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}
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Vector3f getTranslate(const Matrix4f matrix) {
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return Vector3f(matrix.e[12], matrix.e[13], matrix.e[14]);
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}
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Vector3f getUpVector(const Matrix4f matrix) {
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return Vector3f(matrix.e[4], matrix.e[5], matrix.e[6]);
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}
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Vector3f getForwardVector(const Matrix4f matrix) {
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return Vector3f(matrix.e[8], matrix.e[9], matrix.e[10]);
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}
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} } // namespace sp::math
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