private void RenderPreview(IntPtr data, uint cx, uint cy)
{
libobs.obs_video_info ovi = Obs.GetVideoInfo();
int newW = (int)cx;
int newH = (int)cy;
uint baseWidth = ovi.base_width;
uint baseHeight = ovi.base_height;
float previewAspect = (float)cx / cy;
float baseAspect = (float)baseWidth / baseHeight;
//calculate new width and height for source to make it fit inside the preview area
if (previewAspect > baseAspect)
{
newW = (int)(cy * baseAspect);
}
else
{
newH = (int)(cx / baseAspect);
}
int centerX = ((int)cx - newW) / 2;
int centerY = ((int)cy - newH) / 2;
previewScale = (float)newW / baseWidth;
GS.ViewportPush();
GS.ProjectionPush();
//setup orthographic projection of the whole scene to be presented on viewport
GS.Ortho(0.0f, baseWidth, 0.0f, baseHeight, -100.0f, 100.0f);
GS.SetViewport(centerX, centerY, newW, newH);
//draw scene background
ClearBackground(baseWidth, baseHeight);
//render all visible sources
Obs.RenderMainView();
//calculate bottom-right corner on scene space
int right = (int)cx - centerX;
int bottom = (int)cy - centerY;
//ortho for the outer area which would normally not appear on scene
GS.Ortho(-centerX, right, -centerY, bottom, -100.0f, 100.0f);
GS.ResetViewport();
//render editing overlays
RenderSceneEditing(data);
GS.ProjectionPop();
GS.ViewportPop();
GS.LoadVertexBuffer(null);
}
private Vector2 GetPositionInScene(Vector2 position)
{
libobs.obs_video_info ovi = Obs.GetVideoInfo();
int baseWidth = (int)ovi.base_width;
int baseHeight = (int)ovi.base_height;
int scaledWidth = (int)(Width / previewScale);
int scaledHeight = (int)(Height / previewScale);
int left = (scaledWidth - baseWidth) / 2;
int top = (scaledHeight - baseHeight) / 2;
return(new Vector2((int)((position.x / previewScale) - left), (int)((position.y / previewScale) - top)));
}