move GSG::get_supports_render_texture() into GraphicsOutput to support render-to-texture on non-Windows platform. Also, further fixes to FBO render-to-texture.

panda/src/display/graphicsOutput.cxx

@@ -365,15 +365,10 @@ add_render_texture(Texture *tex, RenderTextureMode mode,
   tex->set_size_padded(get_x_size(), get_y_size());
 
   if (mode == RTM_bind_or_copy) {
+    if (!support_render_texture || !get_supports_render_texture()) {
       // Binding is not supported or it is disabled, so just fall back
       // to copy instead.
-    if (!support_render_texture) {
       mode = RTM_copy_texture;
-    } else {
-      nassertv(_gsg != NULL);
-      if (!_gsg->get_supports_render_texture()) {
-        mode = RTM_copy_texture;
-      }
     }
   }
 
@@ -1128,6 +1123,19 @@ void GraphicsOutput::
 unshare_depth_buffer() {
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: GraphicsOutput::get_supports_render_texture
+//       Access: Published, Virtual
+//  Description: Returns true if this particular GraphicsOutput can
+//               render directly into a texture, or false if it must
+//               always copy-to-texture at the end of each frame to
+//               achieve this effect.
+////////////////////////////////////////////////////////////////////
+bool GraphicsOutput::
+get_supports_render_texture() const {
+  return false;
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: GraphicsOutput::flip_ready
 //       Access: Public, Virtual

panda/src/display/graphicsOutput.h

@@ -213,6 +213,8 @@ PUBLISHED:
   virtual bool share_depth_buffer(GraphicsOutput *graphics_output);
   virtual void unshare_depth_buffer();
 
+  virtual bool get_supports_render_texture() const;
+
 public:
   // These are not intended to be called directly by the user.
   virtual bool flip_ready() const;

panda/src/display/graphicsStateGuardian.I

@@ -584,19 +584,6 @@ get_supports_generate_mipmap() const {
   return _supports_generate_mipmap;
 }
 
-////////////////////////////////////////////////////////////////////
-//     Function: GraphicsStateGuardian::get_supports_render_texture
-//       Access: Published
-//  Description: Returns true if this particular GSG can render
-//               directly into a texture, or false if it must always
-//               copy-to-texture at the end of each frame to achieve
-//               this effect.
-////////////////////////////////////////////////////////////////////
-INLINE bool GraphicsStateGuardian::
-get_supports_render_texture() const {
-  return _supports_render_texture;
-}
-
 ////////////////////////////////////////////////////////////////////
 //     Function: GraphicsStateGuardian::get_supports_depth_texture
 //       Access: Published

panda/src/display/graphicsStateGuardian.cxx

@@ -210,7 +210,6 @@ GraphicsStateGuardian(CoordinateSystem internal_coordinate_system,
   // Similarly with these capabilities flags.
   _supports_multisample = false;
   _supports_generate_mipmap = false;
-  _supports_render_texture = false;
   _supports_depth_texture = false;
   _supports_depth_stencil = false;
   _supports_shadow_filter = false;

panda/src/display/graphicsStateGuardian.h

@@ -139,7 +139,6 @@ PUBLISHED:
   INLINE bool get_copy_texture_inverted() const;
   virtual bool get_supports_multisample() const;
   INLINE bool get_supports_generate_mipmap() const;
-  INLINE bool get_supports_render_texture() const;
   INLINE bool get_supports_depth_texture() const;
   INLINE bool get_supports_depth_stencil() const;
   INLINE bool get_supports_shadow_filter() const;
@@ -478,7 +477,6 @@ protected:
   bool _copy_texture_inverted;
   bool _supports_multisample;
   bool _supports_generate_mipmap;
-  bool _supports_render_texture;
   bool _supports_depth_texture;
   bool _supports_depth_stencil;
   bool _supports_shadow_filter;

panda/src/dxgsg8/dxGraphicsStateGuardian8.I

@@ -144,3 +144,16 @@ get_safe_buffer_start() {
 
   return _safe_buffer_start;
 }
+
+////////////////////////////////////////////////////////////////////
+//     Function: DXGraphicsStateGuardian8::get_supports_render_texture
+//       Access: Published
+//  Description: Returns true if this particular GSG can render
+//               from a wdxGraphicsBuffer8 directly into a texture, or
+//               false if it must always copy-to-texture at the end of
+//               each frame to achieve this effect.
+////////////////////////////////////////////////////////////////////
+INLINE bool DXGraphicsStateGuardian8::
+get_supports_render_texture() const {
+  return _supports_render_texture;
+}

panda/src/dxgsg8/dxGraphicsStateGuardian8.cxx

@@ -96,6 +96,7 @@ DXGraphicsStateGuardian8(GraphicsEngine *engine, GraphicsPipe *pipe) :
   _vertex_blending_enabled = false;
   _overlay_windows_supported = false;
   _tex_stats_retrieval_impossible = false;
+  _supports_render_texture = false;
 
   _active_vbuffer = NULL;
   _active_ibuffer = NULL;

panda/src/dxgsg8/dxGraphicsStateGuardian8.h

@@ -122,6 +122,7 @@ public:
   virtual void set_state_and_transform(const RenderState *state,
                                        const TransformState *transform);
   LPDIRECT3DDEVICE8 get_d3d_device();
+  INLINE bool get_supports_render_texture() const;
 
   static bool get_gamma_table(void);
   static bool static_set_gamma(bool restore, PN_stdfloat gamma);
@@ -225,6 +226,7 @@ protected:
   HRESULT _last_testcooplevel_result;
 
   bool _vertex_blending_enabled;
+  bool _supports_render_texture;
 
   RenderBuffer::Type _cur_read_pixel_buffer;  // source for copy_pixel_buffer operation
   bool _auto_rescale_normal;

panda/src/dxgsg9/dxGraphicsStateGuardian9.I

@@ -213,3 +213,16 @@ set_sampler_state (DWORD sampler, D3DSAMPLERSTATETYPE type, DWORD value)
   return hr;
 }
 
+
+////////////////////////////////////////////////////////////////////
+//     Function: DXGraphicsStateGuardian9::get_supports_render_texture
+//       Access: Published
+//  Description: Returns true if this particular GSG can render
+//               from a wdxGraphicsBuffer9 directly into a texture, or
+//               false if it must always copy-to-texture at the end of
+//               each frame to achieve this effect.
+////////////////////////////////////////////////////////////////////
+INLINE bool DXGraphicsStateGuardian9::
+get_supports_render_texture() const {
+  return _supports_render_texture;
+}

panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx

@@ -115,6 +115,7 @@ DXGraphicsStateGuardian9(GraphicsEngine *engine, GraphicsPipe *pipe) :
   _vertex_blending_enabled = false;
   _overlay_windows_supported = false;
   _tex_stats_retrieval_impossible = false;
+  _supports_render_texture = false;
 
   _active_ibuffer = NULL;
 

panda/src/dxgsg9/dxGraphicsStateGuardian9.h

@@ -157,6 +157,8 @@ public:
   INLINE HRESULT set_texture_stage_state (DWORD stage, D3DTEXTURESTAGESTATETYPE type, DWORD value);
   INLINE HRESULT set_sampler_state (DWORD sampler, D3DSAMPLERSTATETYPE type, DWORD value);
 
+  INLINE bool get_supports_render_texture() const;
+
   static bool get_gamma_table(void);
   static bool static_set_gamma(bool restore, PN_stdfloat gamma);
   bool set_gamma(PN_stdfloat gamma);
@@ -269,6 +271,7 @@ protected:
   HRESULT _last_testcooplevel_result;
 
   bool _vertex_blending_enabled;
+  bool _supports_render_texture;
 
   RenderBuffer::Type _cur_read_pixel_buffer;  // source for copy_pixel_buffer operation
   bool _auto_rescale_normal;

panda/src/egldisplay/eglGraphicsPipe.cxx

@@ -232,11 +232,15 @@ make_output(const string &name,
 
   bool support_rtt;
   support_rtt = false;
+  /*
+    Currently, no support for eglGraphicsBuffer render-to-texture.
   if (eglgsg) {
      support_rtt =
       eglgsg -> get_supports_render_texture() &&
       support_render_texture;
   }
+  */
+
   // First thing to try: an eglGraphicsWindow
 
   if (retry == 0) {

panda/src/glstuff/glGraphicsBuffer_src.cxx

@@ -158,7 +158,6 @@ begin_frame(FrameMode mode, Thread *current_thread) {
       }
     }
 
-    if (_needs_rebuild) {
     rebuild_bitplanes();
       
     if (_needs_rebuild) {
@@ -167,7 +166,6 @@ begin_frame(FrameMode mode, Thread *current_thread) {
       return false;
     }
   }
-  }
 
   _gsg->set_current_properties(&get_fb_properties());
   report_my_gl_errors();
@@ -237,13 +235,14 @@ rebuild_bitplanes() {
     return;
   }
 
-  if (!_needs_rebuild) {
-    return;
-  }
-
   CLP(GraphicsStateGuardian) *glgsg;
   DCAST_INTO_V(glgsg, _gsg);
 
+  if (!_needs_rebuild) {
+    glgsg->bind_fbo(_fbo[0]);
+    return;
+  }
+  
   // Calculate bitplane size.  This can be larger than the buffer.
   if (_creation_flags & GraphicsPipe::BF_size_track_host) {
     if ((_host->get_x_size() != _x_size)||
@@ -290,10 +289,6 @@ rebuild_bitplanes() {
         continue;
       }
 
-      if (tex->get_texture_type() == Texture::TT_cube_map) {
-        any_cube_maps = true;
-      }
-
       // If I can't find an appropriate slot, or if there's
       // already a texture bound to this slot, then punt
       // this texture.
@@ -301,8 +296,12 @@ rebuild_bitplanes() {
         ((CData *)cdata.p())->_textures[i]._rtm_mode = RTM_copy_texture;
         continue;
       }
+
       // Assign the texture to this slot.
       attach[plane] = tex;
+      if (tex->get_texture_type() == Texture::TT_cube_map) {
+        any_cube_maps = true;
+      }
     }
   }
   
@@ -1018,6 +1017,20 @@ unshare_depth_buffer() {
   }
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: glGraphicsBuffer::get_supports_render_texture
+//       Access: Published, Virtual
+//  Description: Returns true if this particular GraphicsOutput can
+//               render directly into a texture, or false if it must
+//               always copy-to-texture at the end of each frame to
+//               achieve this effect.
+////////////////////////////////////////////////////////////////////
+bool CLP(GraphicsBuffer)::
+get_supports_render_texture() const {
+  // FBO-based buffers, by their nature, can always bind-to-texture.
+  return true;
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: glGraphicsBuffer::register_shared_depth_buffer
 //       Access: Public

panda/src/glstuff/glGraphicsBuffer_src.h

@@ -77,6 +77,8 @@ public:
   virtual bool share_depth_buffer(GraphicsOutput *graphics_output);
   virtual void unshare_depth_buffer();
 
+  virtual bool get_supports_render_texture() const;
+
   void register_shared_depth_buffer(GraphicsOutput *graphics_output);
   void unregister_shared_depth_buffer(GraphicsOutput *graphics_output);
 

panda/src/glxdisplay/glxGraphicsPipe.cxx

@@ -95,11 +95,15 @@ make_output(const string &name,
 
   bool support_rtt;
   support_rtt = false;
+  /*
+    Currently, no support for glxGraphicsBuffer render-to-texture.
   if (glxgsg) {
      support_rtt = 
       glxgsg -> get_supports_render_texture() && 
       support_render_texture;
   }  
+  */
+
   // First thing to try: a glxGraphicsWindow
 
   if (retry == 0) {

panda/src/wgldisplay/wglGraphicsBuffer.cxx

@@ -253,6 +253,25 @@ process_events() {
   }
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: wglGraphicsBuffer::get_supports_render_texture
+//       Access: Published, Virtual
+//  Description: Returns true if this particular GraphicsOutput can
+//               render directly into a texture, or false if it must
+//               always copy-to-texture at the end of each frame to
+//               achieve this effect.
+////////////////////////////////////////////////////////////////////
+bool wglGraphicsBuffer::
+get_supports_render_texture() const {
+  if (_gsg == (GraphicsStateGuardian *)NULL) {
+    return false;
+  }
+
+  wglGraphicsStateGuardian *wglgsg;
+  DCAST_INTO_R(wglgsg, _gsg, false);
+  return wglgsg->get_supports_wgl_render_texture();
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: wglGraphicsBuffer::close_buffer
 //       Access: Protected, Virtual

panda/src/wgldisplay/wglGraphicsBuffer.h

@@ -53,6 +53,8 @@ public:
 
   virtual void process_events();
 
+  virtual bool get_supports_render_texture() const;
+
 protected:
   virtual void close_buffer();
   virtual bool open_buffer();

panda/src/wgldisplay/wglGraphicsPipe.cxx

@@ -126,7 +126,7 @@ make_output(const string &name,
   support_rtt = false;
   if (wglgsg) {
      support_rtt = 
-      wglgsg -> get_supports_render_texture() && 
+      wglgsg -> get_supports_wgl_render_texture() && 
       support_render_texture;
   }
 

panda/src/wgldisplay/wglGraphicsStateGuardian.I

@@ -100,3 +100,15 @@ get_twindow_dc() {
   return _twindow_dc;
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: wglGraphicsStateGuardian::get_supports_wgl_render_texture
+//       Access: Published
+//  Description: Returns true if this particular GSG can render
+//               from a wglGraphicsBuffer directly into a texture, or
+//               false if it must always copy-to-texture at the end of
+//               each frame to achieve this effect.
+////////////////////////////////////////////////////////////////////
+INLINE bool wglGraphicsStateGuardian::
+get_supports_wgl_render_texture() const {
+  return _supports_wgl_render_texture;
+}

panda/src/wgldisplay/wglGraphicsStateGuardian.cxx

@@ -45,6 +45,7 @@ wglGraphicsStateGuardian(GraphicsEngine *engine, GraphicsPipe *pipe,
   _supports_pbuffer = false;
   _supports_pixel_format = false;
   _supports_wgl_multisample = false;
+  _supports_wgl_render_texture = false;
   
   get_gamma_table();
   atexit(atexit_function);
@@ -518,9 +519,9 @@ reset() {
 
   _supports_wgl_multisample = has_extension("WGL_ARB_multisample");
 
-  _supports_render_texture = has_extension("WGL_ARB_render_texture");
+  _supports_wgl_render_texture = has_extension("WGL_ARB_render_texture");
 
-  if (_supports_render_texture) {
+  if (_supports_wgl_render_texture) {
     _wglBindTexImageARB = 
       (PFNWGLBINDTEXIMAGEARBPROC)wglGetProcAddress("wglBindTexImageARB");
     _wglReleaseTexImageARB = 
@@ -532,7 +533,7 @@ reset() {
         _wglSetPbufferAttribARB == NULL) {
       wgldisplay_cat.error()
         << "Driver claims to support WGL_ARB_render_texture, but does not define all functions.\n";
-      _supports_render_texture = false;
+      _supports_wgl_render_texture = false;
     }
   }
 }

panda/src/wgldisplay/wglGraphicsStateGuardian.h

@@ -47,6 +47,7 @@ public:
   virtual void reset();
 
   INLINE HDC get_twindow_dc();
+  INLINE bool get_supports_wgl_render_texture() const;
 
   static bool get_gamma_table(void);
   static bool static_set_gamma(bool restore, PN_stdfloat gamma);
@@ -54,6 +55,7 @@ public:
   void restore_gamma();
   static void atexit_function(void);
 
+
 protected:
   virtual void get_extra_extensions();
   virtual void *do_get_extension_func(const char *prefix, const char *name);
@@ -84,7 +86,6 @@ private:
   FrameBufferProperties _pre_pfnum_properties;
   int _pre_pfnum;
 
-  
   bool _made_context;
   HGLRC _context;
 
@@ -112,6 +113,7 @@ public:
 
   bool _supports_wgl_multisample;
 
+  bool _supports_wgl_render_texture;
   PFNWGLBINDTEXIMAGEARBPROC _wglBindTexImageARB;
   PFNWGLRELEASETEXIMAGEARBPROC _wglReleaseTexImageARB;
   PFNWGLSETPBUFFERATTRIBARBPROC _wglSetPbufferAttribARB;