mirror of
https://github.com/alula/SpaceCadetPinball.git
synced 2024-11-27 03:59:51 +01:00
63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
#include "pch.h"
|
|
#include "proj.h"
|
|
|
|
mat4_row_major proj::matrix;
|
|
float proj::d_, proj::centerx, proj::centery;
|
|
|
|
void proj::init(float* mat4x3, float d, float centerX, float centerY)
|
|
{
|
|
/*for (auto colIndex = 0; colIndex < 4; ++colIndex)
|
|
{
|
|
// Todo: out of bounds read from mat4x3?
|
|
for (int rowIndex = colIndex, i = 4; i > 0; rowIndex += 4, --i)
|
|
{
|
|
((float*)&matrix)[rowIndex] = mat4x3[rowIndex];
|
|
}
|
|
}*/
|
|
memcpy(&matrix, mat4x3, sizeof(float) * 4 * 3);
|
|
|
|
matrix.Row3.X = 0.0;
|
|
matrix.Row3.Y = 0.0;
|
|
matrix.Row3.Z = 0.0;
|
|
matrix.Row3.W = 1.0;
|
|
|
|
d_ = d;
|
|
centerx = centerX;
|
|
centery = centerY;
|
|
}
|
|
|
|
void proj::matrix_vector_multiply(mat4_row_major* mat, vector_type* vec, vector_type* dstVec)
|
|
{
|
|
const float x = vec->X, y = vec->Y, z = vec->Z;
|
|
dstVec->X = z * mat->Row0.Z + y * mat->Row0.Y + x * mat->Row0.X + mat->Row0.W;
|
|
dstVec->Y = z * mat->Row1.Z + y * mat->Row1.Y + x * mat->Row1.X + mat->Row1.W;
|
|
dstVec->Z = z * mat->Row2.Z + y * mat->Row2.Y + x * mat->Row2.X + mat->Row2.W;
|
|
}
|
|
|
|
float proj::z_distance(vector_type* vec)
|
|
{
|
|
vector_type dstVec{};
|
|
matrix_vector_multiply(&matrix, vec, &dstVec);
|
|
return maths::magnitude(&dstVec);
|
|
}
|
|
|
|
void proj::xform_to_2d(vector_type* vec, int* dst)
|
|
{
|
|
float projCoef;
|
|
vector_type dstVec2{};
|
|
|
|
matrix_vector_multiply(&matrix, vec, &dstVec2);
|
|
if (dstVec2.Z == 0.0f)
|
|
projCoef = 999999.88f;
|
|
else
|
|
projCoef = d_ / dstVec2.Z;
|
|
dst[0] = static_cast<int>(dstVec2.X * projCoef + centerx);
|
|
dst[1] = static_cast<int>(dstVec2.Y * projCoef + centery);
|
|
}
|
|
|
|
void proj::recenter(float centerX, float centerY)
|
|
{
|
|
centerx = centerX;
|
|
centery = centerY;
|
|
}
|