From 0ee9d77f45e007b119de2d44feef81516aaddaaf Mon Sep 17 00:00:00 2001
From: hgn <hgodden00@gmail.com>
Date: Sat, 17 Jul 2021 08:39:24 +0100
Subject: [PATCH 1/1] height filtering

---
 build.sh                              |  4 ++--
 csRadar.c                             | 11 ++++++++++-
 csRadar.h                             |  3 +++
 csrDraw.h                             |  7 ++++---
 ext_csr_free.c => ext_csr_substance.c |  3 +++
 5 files changed, 22 insertions(+), 6 deletions(-)
 rename ext_csr_free.c => ext_csr_substance.c (97%)

diff --git a/build.sh b/build.sh
index a898a68..299bf3a 100755
--- a/build.sh
+++ b/build.sh
@@ -18,5 +18,5 @@ mkdir -p ext
 echo build: csRadar
 gcc $flags -rdynamic csRadar.c -o csRadar -lm -ldl
 
-echo build: ext/csRadarFree.so
-gcc $flags -fpic -shared -o ext/csRadarFree.so ext_csr_free.c -lm
+echo build: ext/csr_substance.so
+gcc $flags -fpic -shared -o ext/csr_substance.so ext_csr_substance.c -lm
diff --git a/csRadar.c b/csRadar.c
index 9f05c2b..f79fa3b 100644
--- a/csRadar.c
+++ b/csRadar.c
@@ -16,6 +16,8 @@ int main( int argc, char *argv[] )
 	{
 		.padding = 128.f,
 		.resolution = 1024,
+		.min_z = -INFINITY,
+		.max_z =  INFINITY,
 		.write_txt = 1,
 		.api_version = csr_api_version,
 		.sampling_mode = k_EMSAA_RGSS
@@ -91,6 +93,11 @@ int main( int argc, char *argv[] )
 		{
 			extension = arg;
 		}
+		
+		if( (arg = csr_long_opt_arg( "min" )) )
+			api.min_z = atof( arg );
+		if( (arg = csr_long_opt_arg( "max" )) )
+			api.max_z = atof( arg );
 
 		if( csr_opt( 'v' ) || csr_long_opt( "version" ) )
 		{
@@ -121,6 +128,8 @@ int main( int argc, char *argv[] )
 				"   --no-txt                       Don't create matching radar txt\n"
 				"   --multi-sample=RGSS            [ none, 2x, rgss, 8r ]\n"
 				"   --extension=TAR                Use an extension binary instead\n"
+				"   --min=z                        Miniumum height to render\n"
+				"   --max=z                        Maxiumum height to render\n"
 				"\n"
 				"   -v --version                   Display program version\n"
 				"   -h --help                      Display this help text\n"
@@ -169,7 +178,7 @@ int main( int argc, char *argv[] )
 			}
 		
 			if( !extension )
-				extension = "csRadarFree";
+				extension = "csr_substance";
 		
 			csr_so ext = csr_libopen( extension );
 			
diff --git a/csRadar.h b/csRadar.h
index 4192e55..0415518 100644
--- a/csRadar.h
+++ b/csRadar.h
@@ -64,6 +64,9 @@ struct csr_api
 	char vmf_name[ 128 ];			// Just the base name eg. my_map
 	EMSAA sampling_mode;
 	
+	float min_z;
+	float max_z;
+	
 	// Main API interface
 	vmf_map *map;
 	csr_target target;
diff --git a/csrDraw.h b/csrDraw.h
index b744c04..fff1590 100644
--- a/csrDraw.h
+++ b/csrDraw.h
@@ -317,11 +317,12 @@ void simple_raster( csr_target *rt, vmf_vert tri[3] )
 				bcc = (v0[0]*vp[1] - vp[0]*v0[1]) * d;
 				bca = 1.f - bcb - bcc;
 				
-				float hit = (tri[0].co[2] * bca + tri[1].co[2] * bcb + tri[2].co[2] * bcc) +16385.f;
+				float hit = tri[0].co[2] * bca + tri[1].co[2] * bcb + tri[2].co[2] * bcc;
+				float hit_depth = hit + 16385.f;
 				
-				if( hit > depth[i] )
+				if( hit_depth > depth[i] && hit >= rt->bounds[0][2] && hit <= rt->bounds[1][2] )
 				{
-					depth[i] = hit;
+					depth[i] = hit_depth;
 					rt->shader->frag( frag+i*rt->shader->stride, tri, bca, bcb, bcc );
 				}
 			}
diff --git a/ext_csr_free.c b/ext_csr_substance.c
similarity index 97%
rename from ext_csr_free.c
rename to ext_csr_substance.c
index ffec370..4dd2627 100644
--- a/ext_csr_free.c
+++ b/ext_csr_substance.c
@@ -43,6 +43,9 @@ void csr_ext_main( csr_api *api )
 	v2_copy( api->target.bounds[0], remapping_range );
 	v2_sub( api->target.bounds[1], api->target.bounds[0], &remapping_range[2] );
 	
+	api->target.bounds[0][2] = api->min_z;
+	api->target.bounds[1][2] = api->max_z;
+	
 	// Draw everything
 	draw_buffers( api, 0 ); 
 }
-- 
2.25.1