void OrthoViewportState::EnableImpl() {
int viewport[4];
glGetIntegerv(GL_VIEWPORT, viewport);
m_viewport_dim = Dim2(viewport[2] - viewport[0], viewport[3] - viewport[1]);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
#ifndef GL_ES
glOrtho(0, viewport[2], viewport[3], 0, -1, 1);
#else
glOrthof(0, viewport[2], viewport[3], 0, -1, 1);
#endif
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
}
void SetSize(int width, int height) {
BeginWriteOperation();
m_impl->SetSize(Dim2(width, height));
}
/// Component-wise subtraction
Dim2 operator-(const Dim2& rhs) const
{
return Dim2(y - rhs.y, x - rhs.x);
}
/// Component-wise addition
Dim2 operator+(const Dim2& rhs) const
{
return Dim2(y + rhs.y, x + rhs.x);
}
static Dim2 FromLinear(const Dim2& size, int i)
{
div_t r = div(i, size.x);
return Dim2(r.quot, r.rem);
}
/// Component-wise multiplication
Dim2 operator*(const Dim2& rhs) const
{
return Dim2(y * rhs.y, x * rhs.x);
}
