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Fix wrong fog calculation issue

This commit is contained in:
Flyinghead 2018-05-15 21:19:58 +02:00
parent d8165376be
commit b469f05b9d
1 changed files with 20 additions and 17 deletions
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37
core/rend/gles/gles.cpp
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@ -1053,25 +1053,28 @@ void tryfit(float* x,float* y)
} }
} }
double a,b; double a = 0, b = 0;
b=(cnt*sylnx-sy*slnx)/(cnt*slnx2-slnx*slnx); if (slnx != 0)
a=(sy-b*slnx)/(cnt);
//We use log2 and not ln on calculations //B*log(x)+A
//log2(x)=log(x)/log(2)
//log(x)=log2(x)*log(2)
//B*log(2)*log(x)+A
b*=logf(2.0);
/*
float maxdev=0;
for (int i=0;i<128;i++)
{ {
float diff=min(max(b*logf(x[i])/logf(2.0)+a,(double)0),(double)1)-y[i]; b=(cnt*sylnx-sy*slnx)/(cnt*slnx2-slnx*slnx);
maxdev=max((float)fabs((float)diff),(float)maxdev); a=(sy-b*slnx)/(cnt);
//We use log2 and not ln on calculations //B*log(x)+A
//log2(x)=log(x)/log(2)
//log(x)=log2(x)*log(2)
//B*log(2)*log(x)+A
b*=logf(2.0);
/*
float maxdev=0;
for (int i=0;i<128;i++)
{
float diff=min(max(b*logf(x[i])/logf(2.0)+a,(double)0),(double)1)-y[i];
maxdev=max((float)fabs((float)diff),(float)maxdev);
}
printf("FOG TABLE Curve match: maxdev: %.02f cents\n",maxdev*100);
*/
} }
printf("FOG TABLE Curve match: maxdev: %.02f cents\n",maxdev*100);
*/
ShaderUniforms.fog_coefs[0] = a; ShaderUniforms.fog_coefs[0] = a;
ShaderUniforms.fog_coefs[1] = b; ShaderUniforms.fog_coefs[1] = b;
//printf("%f\n",B*log(maxdev)/log(2.0)+A); //printf("%f\n",B*log(maxdev)/log(2.0)+A);