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c: Add matrix scale

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a dinosaur
2025-06-19 21:48:05 +10:00
parent 39db537bab
commit ec9803fa32
2 changed files with 26 additions and 0 deletions
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14
src/c/matrix.c
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@@ -8,6 +8,7 @@
extern inline void Mtx_Identity(float m[16]); extern inline void Mtx_Identity(float m[16]);
extern inline void Mtx_Translation(float m[16], float x, float y, float z); extern inline void Mtx_Translation(float m[16], float x, float y, float z);
extern inline void Mtx_Scaled(float m[16], float x, float y, float z);
static void MakeRotation(float m[9], float c, float s, float x, float y, float z) static void MakeRotation(float m[9], float c, float s, float x, float y, float z)
{ {
@@ -109,6 +110,19 @@ void Mtx_Translate(float m[16], float x, float y, float z)
m[15] += x * m[3] + y * m[7] + z * m[11]; m[15] += x * m[3] + y * m[7] + z * m[11];
} }
void Mtx_Scale(float m[16], float x, float y, float z)
{
/*
m = { [x 0 0 0]
[0 y 0 0]
[0 0 z 0]
[0 0 0 1] } * m
*/
m[0] *= x; m[1] *= x; m[2] *= x; m[3] *= x;
m[4] *= y; m[5] *= y; m[6] *= y; m[7] *= y;
m[8] *= z; m[9] *= z; m[10] *= z; m[11] *= z;
}
void Mtx_Rotate(float m[16], float angle, float x, float y, float z) void Mtx_Rotate(float m[16], float angle, float x, float y, float z)
{ {
// Set up temporaries // Set up temporaries

12
src/c/matrix.h
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@@ -25,12 +25,24 @@ inline void Mtx_Translation(float m[16], float x, float y, float z)
}, sizeof(float) * 16); }, sizeof(float) * 16);
} }
inline void Mtx_Scaled(float m[16], float x, float y, float z)
{
SDL_memcpy(m, (float[])
{
x, 0, 0, 0,
0, y, 0, 0,
0, 0, z, 0,
0, 0, 0, 1
}, sizeof(float) * 16);
}
void Mtx_Rotation(float m[16], float angle, float x, float y, float z); void Mtx_Rotation(float m[16], float angle, float x, float y, float z);
void Mtx_Perspective(float m[16], float fovy, float aspect, float near, float far); void Mtx_Perspective(float m[16], float fovy, float aspect, float near, float far);
void Mtx_Multiply(float m[16], const float l[16], const float r[16]); void Mtx_Multiply(float m[16], const float l[16], const float r[16]);
void Mtx_Translate(float m[16], float x, float y, float z); void Mtx_Translate(float m[16], float x, float y, float z);
void Mtx_Scale(float m[16], float x, float y, float z);
void Mtx_Rotate(float m[16], float angle, float x, float y, float z); void Mtx_Rotate(float m[16], float angle, float x, float y, float z);
#endif//MATRIX_H #endif//MATRIX_H