Revert "fix(opengl): use Lazarus OpenGLContext"

This reverts commit 004c363df8.

SpectrumViewOpengl.pas

@@ -16,7 +16,7 @@ interface
 
 uses
   Classes, SysUtils, Graphics, Controls, Math, Types,
-  OpenGLContext, GL,
+  OpenGLContextEx, GL,
   AppTheme, SpectrumView, VfoOverlay, BandPlanOverlay,
   WaterfallView, WaterfallViewOpengl;
 
@@ -980,7 +980,9 @@ begin
   H := FGLControl.Height;
   if (W <= 0) or (H <= 0) then Exit;
 
-  glViewport(0, 0, W, H);
+  // HiDPI: viewport в физических пикселях FBO, координаты — логические
+  glViewport(0, 0, Round(W * FGLControl.PixelScale),
+             Round(H * FGLControl.PixelScale));
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity;
   glOrtho(0, W, H, 0, -1, 1);