From faf2fa91d232f804b1d5b74f79e06e4625ce09fd Mon Sep 17 00:00:00 2001
From: david <david>
Date: Sat, 30 Mar 2002 12:52:24 +0000
Subject: [PATCH] Patch from Jim Wilson:

Clear frame buffer and render model after rest of 3D scene. This has a
small frame rate cost (YMV). But who thought 3D cockpit would be cheap?
If anyone has a better idea, have at it!

Just did some more careful testing and I see little or no frame rate loss
with the depth buffer clear.  Also you can change the near plane to 0.1
and get rid of the "sunroof" (so I don't have to make up another set of
patches.
---
 src/Main/main.cxx | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/src/Main/main.cxx b/src/Main/main.cxx
index 1067ef38d..69d0a7822 100644
--- a/src/Main/main.cxx
+++ b/src/Main/main.cxx
@@ -138,7 +138,7 @@ FGTileEntry *dummy_tile;
 sgVec3 rway_ols;
 // ADA
 // Clip plane settings...
-float cockpit_nearplane = 0.2f;
+float cockpit_nearplane = 0.1f;
 float cockpit_farplane = 120000.0f;
 float scene_nearplane = 0.5f;
 float scene_farplane = 120000.0f;
@@ -640,14 +640,10 @@ void fgRenderFrame( void ) {
 
 	// draw the ssg scene
 	glEnable( GL_DEPTH_TEST );
+
         ssgSetNearFar( scene_nearplane, scene_farplane );
 	ssgCullAndDraw( scene );
 
-        // if in cockpit view adjust nearfar...
-        if (globals->get_current_view()->getType() == 0 )
-          ssgSetNearFar( cockpit_nearplane, cockpit_farplane );
-	ssgCullAndDraw( cockpit );
-
 	// change state for lighting here
 
 	// draw lighting
@@ -692,6 +688,7 @@ void fgRenderFrame( void ) {
         ssgSetNearFar( scene_nearplane, scene_farplane );
 	ssgCullAndDraw( lighting );
 
+
 #ifdef FG_EXPERIMENTAL_LIGHTING
 	if (glutExtensionSupported("GL_EXT_point_parameters")) {
             // Disable states used for runway lighting
@@ -711,6 +708,16 @@ void fgRenderFrame( void ) {
 	    thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 	}
 
+        // if in cockpit view adjust nearfar...
+        if (globals->get_current_view()->getType() == 0 ) {
+          glClearDepth(1);
+          glClear(GL_DEPTH_BUFFER_BIT);
+          ssgSetNearFar( cockpit_nearplane, cockpit_farplane );
+  	  ssgCullAndDraw( cockpit );
+        } else {
+  	  ssgCullAndDraw( cockpit );
+        }
+
 	// display HUD && Panel
 	glDisable( GL_FOG );
 	glDisable( GL_DEPTH_TEST );
@@ -1898,3 +1905,4 @@ void fgUpdateDCS (void) {
 // $$$ end - added VS Renganathan, 15 Oct 2K
 //           added Venky         , 12 Nov 2K
 
+
-- 
2.39.5