medfall

commit a90e3cb42e4b60af9fdcc7d440b67ab0ef19b579
parent 8c6a0f731825ac9d324a782cb41a69a24eccb65f
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Tue, 14 Nov 2017 23:50:56 +0200

Use fans for empty tile meshes because it will make seams easier

Diffstat:
clipmap.cc
 | 
28
++++++++++++++++++++--------

1 file changed, 20 insertions(+), 8 deletions(-)
diff --git a/clipmap.cc b/clipmap.cc
@@ -223,18 +223,30 @@ GAME_INIT( game_init ) {
 
 	// generate empty tile mesh
 	{
-		StaticArray< v3, 4 > vertices;
-		vertices[ 0 ] = v3( 0, 0, 0 );
-		vertices[ 1 ] = v3( PATCH_RESOLUTION, 0, 0 );
-		vertices[ 2 ] = v3( 0, PATCH_RESOLUTION, 0 );
-		vertices[ 3 ] = v3( PATCH_RESOLUTION, PATCH_RESOLUTION, 0 );
+		StaticArray< v3, PATCH_RESOLUTION * 4 + 1 > vertices;
+		vertices[ 0 ] = v3( PATCH_RESOLUTION / 2.0f, PATCH_RESOLUTION / 2.0f, 0 );
+
+		for( u32 i = 0; i < PATCH_RESOLUTION; i++ ) {
+			vertices[ i + 1 + 0 * PATCH_RESOLUTION ] = v3( i, 0, 0 );
+			vertices[ i + 1 + 1 * PATCH_RESOLUTION ] = v3( PATCH_RESOLUTION, i, 0 );
+			vertices[ i + 1 + 2 * PATCH_RESOLUTION ] = v3( PATCH_RESOLUTION - i, PATCH_RESOLUTION, 0 );
+			vertices[ i + 1 + 3 * PATCH_RESOLUTION ] = v3( 0, PATCH_RESOLUTION - i, 0 );
+		}
+
+		StaticArray< u32, PATCH_RESOLUTION * 12 > indices;
+
+		for( u32 i = 0; i < PATCH_RESOLUTION * 4; i++ ) {
+			indices[ i * 3 + 0 ] = 0;
+			indices[ i * 3 + 1 ] = i + 1;
+			indices[ i * 3 + 2 ] = i + 2;
+		}
 
-		u32 indices[] = { 0, 1, 2, 2, 1, 3 };
+		indices[ indices.size() - 1 ] = 1;
 
 		MeshConfig mesh_config;
 		mesh_config.positions = renderer_new_vb( vertices.ptr(), vertices.num_bytes() );
-		mesh_config.indices = renderer_new_ib( indices, sizeof( indices ) );
-		mesh_config.num_vertices = ARRAY_COUNT( indices );
+		mesh_config.indices = renderer_new_ib( indices.ptr(), indices.num_bytes() );
+		mesh_config.num_vertices = indices.size();
 		clipmap.gpu.empty_tile = renderer_new_mesh( mesh_config );
 	}