medfall

commit c44b3af3425d6f8db8737a037e7cf6933213a954
parent 9372d70ac10f2b4a0b42993bb5d4050140b9aae4
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Tue, 21 Nov 2017 00:38:35 +0200

Draw the centre cross filler mesh

Diffstat:
clipmap.cc
 | 
77
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 77 insertions(+), 0 deletions(-)
diff --git a/clipmap.cc b/clipmap.cc
@@ -26,6 +26,7 @@ struct ClipmapTerrain {
 		Mesh horizontal_filler;
 		Mesh vertical_filler;
 		Mesh trim;
+		Mesh cross;
 		Mesh seam;
 		Mesh skirt;
 		Texture heightmap;
@@ -367,6 +368,74 @@ GAME_INIT( game_init ) {
 		clipmap.gpu.trim = renderer_new_mesh( mesh_config );
 	}
 
+	// generate cross mesh
+	{
+		MEMARENA_SCOPED_CHECKPOINT( &mem->persistent_arena );
+
+		array< v3 > vertices = alloc_array< v3 >( &mem->persistent_arena, PATCH_RESOLUTION * 8 + 4 );
+		size_t n = 0;
+
+		// horizontal vertices
+		for( u32 i = 0; i < PATCH_RESOLUTION * 2 + 1; i++ ) {
+			vertices[ n++ ] = v3( i - float( PATCH_RESOLUTION ), 0, 0 );
+			vertices[ n++ ] = v3( i - float( PATCH_RESOLUTION ), 1, 0 );
+		}
+
+		size_t start_of_vertical = n;
+
+		// vertical vertices
+		for( u32 i = 0; i < PATCH_RESOLUTION * 2 + 1; i++ ) {
+			vertices[ n++ ] = v3( 0, i - float( PATCH_RESOLUTION ), 0 );
+			vertices[ n++ ] = v3( 1, i - float( PATCH_RESOLUTION ), 0 );
+		}
+
+		ASSERT( n == vertices.n );
+
+		array< u32 > indices = alloc_array< u32 >( &mem->persistent_arena, PATCH_RESOLUTION * 24 - 6 );
+		n = 0;
+
+		// horizontal indices
+		for( u32 i = 0; i < PATCH_RESOLUTION * 2; i++ ) {
+			u32 bl = i * 2 + 0;
+			u32 br = i * 2 + 1;
+			u32 tl = i * 2 + 2;
+			u32 tr = i * 2 + 3;
+
+			indices[ n++ ] = br;
+			indices[ n++ ] = bl;
+			indices[ n++ ] = tr;
+			indices[ n++ ] = bl;
+			indices[ n++ ] = tl;
+			indices[ n++ ] = tr;
+		}
+
+		// vertical indices
+		for( u32 i = 0; i < PATCH_RESOLUTION * 2; i++ ) {
+			if( i == PATCH_RESOLUTION )
+				continue;
+
+			u32 bl = i * 2 + 0;
+			u32 br = i * 2 + 1;
+			u32 tl = i * 2 + 2;
+			u32 tr = i * 2 + 3;
+
+			indices[ n++ ] = start_of_vertical + br;
+			indices[ n++ ] = start_of_vertical + tr;
+			indices[ n++ ] = start_of_vertical + bl;
+			indices[ n++ ] = start_of_vertical + bl;
+			indices[ n++ ] = start_of_vertical + tr;
+			indices[ n++ ] = start_of_vertical + tl;
+		}
+
+		ASSERT( n == indices.n );
+
+		MeshConfig mesh_config;
+		mesh_config.positions = renderer_new_vb( vertices );
+		mesh_config.indices = renderer_new_ib( indices );
+		mesh_config.num_vertices = indices.n;
+		clipmap.gpu.cross = renderer_new_mesh( mesh_config );
+	}
+
 	// generate skirt mesh
 	{
 		float scale = checked_cast< float >( u32( 1 ) << ( NUM_LODS - 1 ) );
@@ -653,6 +722,14 @@ GAME_FRAME( game_frame ) {
 		render_state.textures[ 3 ] = renderer_blue_noise();
 		render_state.wireframe = game->draw_wireframe;
 
+		// draw cross
+		{
+			v2 snapped_pos = floorf( game->pos.xy() );
+			render_state.uniforms[ UNIFORMS_MODEL ] = rotation_uniforms[ 0 ];
+			render_state.uniforms[ UNIFORMS_CLIPMAP ] = renderer_uniforms( snapped_pos, 1.0f );
+			renderer_draw_mesh( clipmap.gpu.cross, render_state );
+		}
+
 		for( u32 l = 0; l < NUM_LODS; l++ ) {
 			float scale = checked_cast< float >( u32( 1 ) << l );
 			v2 tile_size = v2( checked_cast< float >( PATCH_RESOLUTION << l ) );