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Use vertical instead of horizontal FOV

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Ben Visness
2019-07-09 17:10:42 -05:00
parent 45c91702a9
commit 568df57575
1 changed files with 5 additions and 3 deletions
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HandmadeMath.h
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@@ -1186,10 +1186,12 @@ HMM_INLINE hmm_mat4 HMM_Perspective(float FOV, float AspectRatio, float Near, fl
{ {
hmm_mat4 Result = HMM_Mat4(); hmm_mat4 Result = HMM_Mat4();
float TanThetaOver2 = HMM_TanF(FOV * (HMM_PI32 / 360.0f)); // See https://www.khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/gluPerspective.xml
float Cotangent = 1.0f / HMM_TanF(FOV * (HMM_PI32 / 360.0f));
Result.Elements[0][0] = 1.0f / TanThetaOver2; Result.Elements[0][0] = Cotangent / AspectRatio;
Result.Elements[1][1] = AspectRatio / TanThetaOver2; Result.Elements[1][1] = Cotangent;
Result.Elements[2][3] = -1.0f; Result.Elements[2][3] = -1.0f;
Result.Elements[2][2] = (Near + Far) / (Near - Far); Result.Elements[2][2] = (Near + Far) / (Near - Far);
Result.Elements[3][2] = (2.0f * Near * Far) / (Near - Far); Result.Elements[3][2] = (2.0f * Near * Far) / (Near - Far);