slightly better viewport handling

panda/src/display/displayRegion.cxx

@@ -36,7 +36,7 @@ DisplayRegion(GraphicsOutput *window) :
   _window(window)
 {
   _draw_buffer_type = window->get_draw_buffer_type();
-  compute_pixels();
+  compute_pixels_all_stages();
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -50,6 +50,7 @@ DisplayRegion(GraphicsOutput *window, float l, float r, float b, float t) :
 {
   _draw_buffer_type = window->get_draw_buffer_type();
   set_dimensions(l, r, b, t);
+  compute_pixels_all_stages();
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -334,6 +335,28 @@ compute_pixels() {
   }
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: DisplayRegion::compute_pixels_all_stages
+//       Access: Published
+//  Description: Computes the pixel locations of the DisplayRegion
+//               within its window.  The DisplayRegion will request
+//               the size from the window.
+////////////////////////////////////////////////////////////////////
+void DisplayRegion::
+compute_pixels_all_stages() {
+  int pipeline_stage = Thread::get_current_pipeline_stage();
+  nassertv(pipeline_stage == 0);
+
+  if (_window != (GraphicsOutput *)NULL) {
+    OPEN_ITERATE_ALL_STAGES(_cycler) {
+      CDStageWriter cdata(_cycler, pipeline_stage);
+      do_compute_pixels(_window->get_x_size(), _window->get_y_size(), 
+                        cdata);
+    }
+    CLOSE_ITERATE_ALL_STAGES(_cycler);
+  }
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: DisplayRegion::compute_pixels
 //       Access: Published
@@ -349,6 +372,24 @@ compute_pixels(int x_size, int y_size) {
   do_compute_pixels(x_size, y_size, cdata);
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: DisplayRegion::compute_pixels_all_stages
+//       Access: Published
+//  Description: Performs a compute_pixels() operation for all stages
+//               of the pipeline.  This is appropriate, for instance,
+//               when a window changes sizes, since this is a global
+//               operation; and you want the new window size to be
+//               immediately available even to the downstream stages.
+////////////////////////////////////////////////////////////////////
+void DisplayRegion::
+compute_pixels_all_stages(int x_size, int y_size) {
+  OPEN_ITERATE_ALL_STAGES(_cycler) {
+    CDStageWriter cdata(_cycler, pipeline_stage);
+    do_compute_pixels(x_size, y_size, cdata);
+  } 
+  CLOSE_ITERATE_ALL_STAGES(_cycler);
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: DisplayRegion::get_pixels
 //       Access: Published
@@ -640,6 +681,8 @@ do_compute_pixels(int x_size, int y_size, CData *cdata) {
 DisplayRegion::CData::
 CData() :
   _l(0.), _r(1.), _b(0.), _t(1.),
+  _pl(0), _pr(0), _pb(0), _pt(0),
+  _pbi(0), _pti(0),
   _camera_node((Camera *)NULL),
   _active(true),
   _sort(0),

panda/src/display/displayRegion.h

@@ -30,6 +30,7 @@
 #include "cycleData.h"
 #include "cycleDataReader.h"
 #include "cycleDataWriter.h"
+#include "cycleDataStageWriter.h"
 #include "pipelineCycler.h"
 #include "config_display.h"
 
@@ -91,7 +92,9 @@ PUBLISHED:
   INLINE int get_cube_map_index() const;
 
   void compute_pixels();
+  void compute_pixels_all_stages();
   void compute_pixels(int x_size, int y_size);
+  void compute_pixels_all_stages(int x_size, int y_size);
   void get_pixels(int &pl, int &pr, int &pb, int &pt) const;
   void get_region_pixels(int &xo, int &yo, int &w, int &h) const;
   void get_region_pixels_i(int &xo, int &yo, int &w, int &h) const;
@@ -158,6 +161,7 @@ private:
   PipelineCycler<CData> _cycler;
   typedef CycleDataReader<CData> CDReader;
   typedef CycleDataWriter<CData> CDWriter;
+  typedef CycleDataWriter<CData> CDStageWriter;
 
   // This is a special cycler created to hold the results from the
   // cull traversal, for (a) the draw traversal, and (b) the next

panda/src/display/graphicsOutput.cxx

@@ -565,7 +565,7 @@ set_size_and_recalc(int x, int y) {
   for (dri = _total_display_regions.begin();
        dri != _total_display_regions.end();
        ++dri) {
-    (*dri)->compute_pixels(x,y);
+    (*dri)->compute_pixels_all_stages(x, y);
   }
 
   if (_texture_card != 0) {