mirrors/HandmadeMath
1
0
Fork 0
mirror of https://github.com/HandmadeMath/HandmadeMath.git synced 2025-10-21 16:11:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

Changed Perspective matrix

Browse Source
This commit is contained in:
Zak Strange
2016-03-24 15:15:28 -07:00
parent 6063dfafeb
commit dfe3df4ee4
1 changed files with 12 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
HandmadeMath.h
View File

@@ -706,16 +706,22 @@ Orthographic(float Left, float Right, float Bottom, float Top, float Near, float
return(Result); return(Result);
} }
#define HMM_PI 3.14159265358979323846
HMMDEF mat4 HMMDEF mat4
Perspective(float FOV, float AspectRatio, float Near, float Far) Perspective(float FOV, float AspectRatio, float Near, float Far)
{ {
mat4 Result = Mat4d(1.0f); double Radians = FOV / 2 * HMM_PI / 180;
double Sine = sin(Radians);
double Cotangent = cos(Radians) / Sine;
Result.Elements[0][0] = 1.0f / (AspectRatio * tan(FOV / 2.0f)); double DeltaZ = Far - Near;
Result.Elements[1][1] = 1.0f / tan(FOV / 2.0f);
Result.Elements[2][3] = -1.0f; mat4 Result = Mat4d(1.0f);
Result.Elements[2][2] = -(Far + Near) / (Far - Near); Result.Elements[0][0] = (float)Cotangent / AspectRatio;
Result.Elements[3][2] = -(2.0f * Far * Near) / (Far - Near); Result.Elements[1][1] = (float)Cotangent;
Result.Elements[2][2] = (float)(-(Far + Near) / DeltaZ);
Result.Elements[3][3] = 0;
return(Result); return(Result);
} }