Viewport.cpp

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#include "Viewport.h"
#include "Window.h"
#include "DeviceContext.h"
 
HRESULT
Viewport::init(const Window& window) {
  if (!window.m_hWnd) {
    ERROR("Viewport", "init", "Window handle (m_hWnd) is nullptr");
    return E_POINTER;
  }
  if (window.m_width == 0 || window.m_height == 0) {
    ERROR("Viewport", "init", "Window dimensions are zero.");
    return E_INVALIDARG;
  }
 
  m_viewport.Width = static_cast<float>(window.m_width);
  m_viewport.Height = static_cast<float>(window.m_height);
  m_viewport.MinDepth = 0.0f;
  m_viewport.MaxDepth = 1.0f;
  m_viewport.TopLeftX = 0;
  m_viewport.TopLeftY = 0;
 
  return S_OK;
}
 
HRESULT
Viewport::init(unsigned int width, unsigned int height) {
  if (width == 0 || height == 0) {
    ERROR("Viewport", "init", "Window dimensions are zero.");
    return E_INVALIDARG;
  }
 
  m_viewport.Width = static_cast<float>(width);
  m_viewport.Height = static_cast<float>(height);
  m_viewport.MinDepth = 0.0f;
  m_viewport.MaxDepth = 1.0f;
  m_viewport.TopLeftX = 0;
  m_viewport.TopLeftY = 0;
 
  return S_OK;
}
 
void Viewport::render(DeviceContext& deviceContext) {
  if (!deviceContext.m_deviceContext) {
    ERROR("Viewport", "render", "Device context is not set.");
    return;
  }
  deviceContext.RSSetViewports(1, &m_viewport);
}