/*
Returns a version of 'key' where all numbers have been replaced by zeroes. If
there were none, returns "".
*/
static QCString zeroKey( const char* key )
{
QCString zeroed( strlen( key ) + 1 );
char *z = zeroed.data();
int i = 0, j = 0;
int len;
bool metSomething = FALSE;
while ( key[i] != '\0' )
{
len = numberLength( key + i );
if ( len > 0 )
{
i += len;
z[j++] = '0';
metSomething = TRUE;
}
else
{
z[j++] = key[i++];
}
}
z[j] = '\0';
if ( metSomething )
return zeroed;
else
return "";
}
mat4f persp(float fovy, float aspect, float near_plane, float far_plane) {
float range = tan(math::to_radians(fovy / 2.0f)) * near_plane;
float left = -range * aspect;
float right = range * aspect;
float bottom = -range;
float top = range;
mat4f result = zeroed();
result[0][0] = (2.0f * near_plane) / (right - left);
result[1][1] = (2.0f * near_plane) / (top - bottom);
result[2][2] = -(far_plane + near_plane) / (far_plane - near_plane);
result[2][3] = -1.0f;
result[3][2] = -(2.0f * far_plane * near_plane) / (far_plane - near_plane);
return result;
}