From 3f32f2680d1ebbc28fca60886ff9199d0a3aa3f8 Mon Sep 17 00:00:00 2001
From: curt <curt>
Date: Mon, 4 Dec 2000 05:26:40 +0000
Subject: [PATCH] Started laying out infrastructure for ground lighting.
 Renamed fg_random -> sg_random.

---
 src/Main/main.cxx   | 45 ++++++++++++++++++++++++++++++++++++---------
 src/Main/splash.cxx |  4 ++--
 2 files changed, 38 insertions(+), 11 deletions(-)

diff --git a/src/Main/main.cxx b/src/Main/main.cxx
index 54c42190e..03d88904a 100644
--- a/src/Main/main.cxx
+++ b/src/Main/main.cxx
@@ -64,7 +64,7 @@
 #include <simgear/constants.h>  // for VERSION
 #include <simgear/debug/logstream.hxx>
 #include <simgear/math/polar3d.hxx>
-#include <simgear/math/fg_random.h>
+#include <simgear/math/sg_random.h>
 #include <simgear/misc/fgpath.hxx>
 #include <simgear/sky/sky.hxx>
 #include <simgear/timing/sg_time.hxx>
@@ -162,6 +162,10 @@ ssgBranch *terrain = NULL;
 ssgSelector *penguin_sel = NULL;
 ssgTransform *penguin_pos = NULL;
 
+ssgRoot *lighting = NULL;
+ssgBranch *ground = NULL;
+ssgBranch *airport = NULL;
+
 #ifdef FG_NETWORK_OLK
 ssgSelector *fgd_sel = NULL;
 ssgTransform *fgd_pos = NULL;
@@ -293,6 +297,10 @@ void fgRenderFrame( void ) {
     fgLIGHT *l = &cur_light_params;
     static double last_visibility = -9999;
 
+    static GLfloat fog_exp_density;
+    static GLfloat fog_exp2_density;
+    static GLfloat fog_exp2_punch_through;
+    
     // double angle;
     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
@@ -465,19 +473,18 @@ void fgRenderFrame( void ) {
 
 	    // cout << "----> updating fog params" << endl;
 		
-	    GLfloat fog_exp_density;
-	    GLfloat fog_exp2_density;
-    
 	    // for GL_FOG_EXP
 	    fog_exp_density = -log(0.01 / actual_visibility);
     
 	    // for GL_FOG_EXP2
 	    fog_exp2_density = sqrt( -log(0.01) ) / actual_visibility;
-    
-	    // Set correct opengl fog density
-	    glFogf (GL_FOG_DENSITY, fog_exp2_density);
+	    fog_exp2_punch_through = sqrt( -log(0.01) ) / 
+		( actual_visibility * 1.5 );
 	}
- 
+
+	// Set correct opengl fog density
+	glFogf (GL_FOG_DENSITY, fog_exp2_density);
+
 	// update the sky dome
 	if ( globals->get_options()->get_skyblend() ) {
 	    /* cout << "thesky->repaint() sky_color = "
@@ -646,6 +653,14 @@ void fgRenderFrame( void ) {
 	glEnable( GL_DEPTH_TEST );
 	ssgCullAndDraw( scene );
 
+	// change state for lighting here
+
+	// draw lighting
+	// Set punch through fog density
+	glFogf (GL_FOG_DENSITY, fog_exp2_density);
+
+	ssgCullAndDraw( lighting );
+
 	// draw the sky cloud layers
 	thesky->postDraw( cur_fdm_state->get_Altitude() * FEET_TO_METER );
 
@@ -1344,7 +1359,7 @@ int main( int argc, char **argv ) {
 	    << FLIGHTGEAR_VERSION << endl );
 
     // seed the random number generater
-    fg_srandom();
+    sg_srandom();
 
     // Allocate global data structures.  This needs to happen before
     // we parse command line options
@@ -1508,6 +1523,9 @@ int main( int argc, char **argv ) {
     scene = new ssgRoot;
     scene->setName( "Scene" );
 
+    lighting = new ssgRoot;
+    lighting->setName( "Lighting" );
+
     // Initialize the sky
     FGPath ephem_data_path( globals->get_options()->get_fg_root() );
     ephem_data_path.append( "Astro" );
@@ -1549,6 +1567,15 @@ int main( int argc, char **argv ) {
     terrain->setName( "Terrain" );
     scene->addKid( terrain );
 
+    // Lighting
+    ground = new ssgBranch;
+    ground->setName( "Ground Lighting" );
+    lighting->addKid( ground );
+
+    airport = new ssgBranch;
+    airport->setName( "Airport Lighting" );
+    lighting->addKid( airport );
+
     // temporary visible aircraft "own ship"
     penguin_sel = new ssgSelector;
     penguin_pos = new ssgTransform;
diff --git a/src/Main/splash.cxx b/src/Main/splash.cxx
index 712847eb8..b9444f528 100644
--- a/src/Main/splash.cxx
+++ b/src/Main/splash.cxx
@@ -40,7 +40,7 @@
 #include <string.h>
 
 #include <simgear/debug/logstream.hxx>
-#include <simgear/math/fg_random.h>
+#include <simgear/math/sg_random.h>
 #include <simgear/misc/fgpath.hxx>
 
 #include <Objects/texload.h>
@@ -74,7 +74,7 @@ void fgSplashInit ( void ) {
     xglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 
     // load in the texture data
-    int num = (int)(fg_random() * 4.0 + 1.0);
+    int num = (int)(sg_random() * 4.0 + 1.0);
     char num_str[256];
     sprintf(num_str, "%d", num);