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Faster calculation

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Avoid recalculating expensive calls such as cos,sin and divisions.
This commit is contained in:
safarend 2014-12-01 03:40:34 +13:00
parent ac0e9ef9ca
commit 3c4b8cbe42
1 changed files with 7 additions and 7 deletions
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14
examples/gpu/source/math.c
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@ -43,8 +43,8 @@ void rotateMatrixX(float* tm, float x, bool r)
rm[0]=1.0f;
rm[5]=cos(x);
rm[6]=sin(x);
rm[9]=-sin(x);
rm[10]=cos(x);
rm[9]=-rm[6];
rm[10]=rm[5];
rm[15]=1.0f;
if(!r)multMatrix44(tm,rm,m);
else multMatrix44(rm,tm,m);
@ -58,8 +58,8 @@ void rotateMatrixY(float* tm, float x, bool r)
rm[0]=cos(x);
rm[2]=sin(x);
rm[5]=1.0f;
rm[8]=-sin(x);
rm[10]=cos(x);
rm[8]=-rm[2];
rm[10]=rm[0];
rm[15]=1.0f;
if(!r)multMatrix44(tm,rm,m);
else multMatrix44(rm,tm,m);
@ -72,8 +72,8 @@ void rotateMatrixZ(float* tm, float x, bool r)
memset(rm, 0x00, 16*4);
rm[0]=cos(x);
rm[1]=sin(x);
rm[4]=-sin(x);
rm[5]=cos(x);
rm[4]=-rm[1];
rm[5]=rm[0];
rm[10]=1.0f;
rm[15]=1.0f;
if(!r)multMatrix44(tm,rm,m);
@ -108,7 +108,7 @@ void initProjectionMatrix(float* m, float fovy, float aspect, float near, float
mp[0x8] = 0.0f;
mp[0x9] = 0.0f;
mp[0xA] = -(far+near)/(far-near);
mp[0xB] = -2.0f*(far*near)/(far-near);
mp[0xB] = -2.0f*-mp[0xA];
mp[0xC] = 0.0f;
mp[0xD] = 0.0f;