void DecoStat::DrawText(DecoRenderInterface* RI, char * text, UINT posX, UINT posY, INT win_width, INT win_height)
{
RI->PushState();
matrix44 identity = IdentityMatrix44();
RI->SetTransform(TT_CameraToScreen, identity);
RI->SetTransform(TT_WorldToCamera, identity);
RI->SetTransform(TT_LocalToWorld, identity);
gluOrtho2D(0, win_width, 0, win_height);
RI->ResetLight();
RI->EnableDepthTest(FALSE);
RI->EnableTexture(FALSE);
glListBase(1000);
glRasterPos3d(posX,posY,0);
glCallLists((GLsizei)strlen(text),GL_UNSIGNED_BYTE,text);
RI->PopState();
}
// Invert the matrix44
matrix44 &matrix44::invert()
{
matrix44 a(*this);
matrix44 b(IdentityMatrix44());
unsigned int r, c;
unsigned int cc;
unsigned int rowMax; // Points to max abs value row in this column
unsigned int row;
float tmp;
// Go through columns
for (c=0; c<4; c++)
{
// Find the row with max value in this column
rowMax = c;
for (r=c+1; r<4; r++)
{
if (fabs(a[c][r]) > fabs(a[c][rowMax]))
{
rowMax = r;
}
}
// If the max value here is 0, we can't invert. Return identity.
if (a[c][rowMax] == 0.0F)
return(identity());
// Swap row "rowMax" with row "c"
for (cc=0; cc<4; cc++)
{
tmp = a[cc][c];
a[cc][c] = a[cc][rowMax];
a[cc][rowMax] = tmp;
tmp = b[cc][c];
b[cc][c] = b[cc][rowMax];
b[cc][rowMax] = tmp;
}
// Now everything we do is on row "c".
// Set the max cell to 1 by dividing the entire row by that value
tmp = a[c][c];
for (cc=0; cc<4; cc++)
{
a[cc][c] /= tmp;
b[cc][c] /= tmp;
}
// Now do the other rows, so that this column only has a 1 and 0's
for (row = 0; row < 4; row++)
{
if (row != c)
{
tmp = a[c][row];
for (cc=0; cc<4; cc++)
{
a[cc][row] -= a[cc][c] * tmp;
b[cc][row] -= b[cc][c] * tmp;
}
}
}
}
*this = b;
return *this;
}
