bsnes/nall/matrix-multiply.hpp

37 lines
792 B
C++
Executable File

#pragma once
//matrix multiplication primitives
//used in: ruby/opengl/quark
namespace nall {
template<typename T> inline auto MatrixMultiply(
T* output,
const T* xdata, uint xrows, uint xcols,
const T* ydata, uint yrows, uint ycols
) -> void {
if(xcols != yrows) return;
for(uint y : range(xrows)) {
for(uint x : range(ycols)) {
T sum = 0;
for(uint z : range(xcols)) {
sum += xdata[y * xcols + z] * ydata[z * ycols + x];
}
*output++ = sum;
}
}
}
template<typename T> inline auto MatrixMultiply(
const T* xdata, uint xrows, uint xcols,
const T* ydata, uint yrows, uint ycols
) -> vector<T> {
vector<T> output;
output.resize(xrows * ycols);
MatrixMultiply(output.data(), xdata, xrows, xcols, ydata, yrows, ycols);
return output;
}
}