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Added HMM_MultiplyMat4ByVec4 function

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Multiplies a 4x4 matrix by a 4x4 vector and
returns it.
This commit is contained in:
Kyle De'Vir
2016-05-29 02:58:27 +10:00
parent 136b049106
commit 46fdcfb171
1 changed files with 21 additions and 0 deletions
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21
HandmadeMath.h
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@@ -257,6 +257,7 @@ HMMDEF hmm_vec4 HMM_DivideVec4(hmm_vec4 Left, hmm_vec4 Right);
HMMDEF hmm_mat4 HMM_Mat4(void); HMMDEF hmm_mat4 HMM_Mat4(void);
HMMDEF hmm_mat4 HMM_Mat4d(float Diagonal); HMMDEF hmm_mat4 HMM_Mat4d(float Diagonal);
HMMDEF hmm_mat4 HMM_MultiplyMat4(hmm_mat4 Left, hmm_mat4 Right); HMMDEF hmm_mat4 HMM_MultiplyMat4(hmm_mat4 Left, hmm_mat4 Right);
HMMDEF hmm_vec4 HMM_MultiplyMat4ByVec4(hmm_mat4 Matrix, hmm_vec4 Vector);
HMMDEF hmm_mat4 HMM_Orthographic(float Left, float Right, float Bottom, float Top, float Near, float Far); HMMDEF hmm_mat4 HMM_Orthographic(float Left, float Right, float Bottom, float Top, float Near, float Far);
HMMDEF hmm_mat4 HMM_Perspective(float FOV, float AspectRatio, float Near, float Far); HMMDEF hmm_mat4 HMM_Perspective(float FOV, float AspectRatio, float Near, float Far);
@@ -708,6 +709,26 @@ HMM_MultiplyMat4(hmm_mat4 Left, hmm_mat4 Right)
return (Result); return (Result);
} }
hmm_vec4
HMM_MultiplyMat4ByVec4(hmm_mat4 Matrix, hmm_vec4 Vector)
{
hmm_vec4 Result = HMM_Vec4(0.0f, 0.0f, 0.0f, 0.0f);
int Rows, Columns;
for(Rows = 0; Rows < 4; ++Rows)
{
float Sum = 0;
for(Columns = 0; Columns < 4; ++Columns)
{
Sum += Matrix.Elements[Rows][Columns] * Vector.Elements[Columns];
}
Result.Elements[Rows] = Sum;
}
return (Result);
}
hmm_mat4 hmm_mat4
HMM_Orthographic(float Left, float Right, float Bottom, float Top, float Near, float Far) HMM_Orthographic(float Left, float Right, float Bottom, float Top, float Near, float Far)
{ {