X-Git-Url: https://harrygodden.com/git/?a=blobdiff_plain;f=fishladder.c;h=4e41b5ad924ba80ba678ed55eb7fd3ec6162cde8;hb=1a837016d9060eb0c2ed05a93b9d2a69d0005808;hp=19340148d341e34cfb4756979f440df540443578;hpb=cc0fb04689ed71984458f542bc2154a5609ab95c;p=fishladder.git

diff --git a/fishladder.c b/fishladder.c
index 1934014..4e41b5a 100644
--- a/fishladder.c
+++ b/fishladder.c
@@ -8,11 +8,11 @@ SHADER_DEFINE( shader_tile_colour,
 	// VERTEX
 	"layout (location=0) in vec2 a_co;"
 	"uniform mat3 uPv;"
-	"uniform vec2 uOffset;"
+	"uniform vec3 uOffset;"
 	""
 	"void main()"
 	"{"
-		"gl_Position = vec4( uPv * vec3( a_co + uOffset, 1.0 ), 1.0 );"
+		"gl_Position = vec4( uPv * vec3( a_co * uOffset.z + uOffset.xy, 1.0 ), 1.0 );"
 	"}",
 	
 	// FRAGMENT
@@ -27,6 +27,157 @@ SHADER_DEFINE( shader_tile_colour,
 	UNIFORMS({ "uPv", "uOffset", "uColour" })
 )
 
+SHADER_DEFINE( shader_ball,
+	// VERTEX
+	"layout (location=0) in vec2 a_co;"
+	"uniform vec2 uOffset;"
+	"uniform mat3 uPv;"
+	""
+	"out vec2 aTexCoords;"
+	""
+	"void main()"
+	"{"
+		// Create texture coords
+		"aTexCoords = a_co;"
+		
+		// Vertex transform
+		"vec3 worldpos = vec3( a_co * 0.25 - 0.125 + uOffset, 1.0 );"
+		"gl_Position = vec4( uPv * worldpos, 1.0 );"
+	"}",
+	
+	// FRAGMENT
+	"out vec4 FragColor;"
+	""
+	"uniform sampler2D uTexMain;"
+	"uniform vec3 uColour;"
+	""
+	"in vec2 aTexCoords;"
+	""
+	"void main()"
+	"{"
+		"vec4 glyph = texture( uTexMain, aTexCoords );"
+		"FragColor = vec4( glyph.rgb * uColour, glyph.a );"
+	"}"
+	,
+	UNIFORMS({ "uTexMain", "uColour", "uOffset", "uPv" })
+)
+
+SHADER_DEFINE( shader_tile_main,
+	// VERTEX
+	"layout (location=0) in vec2 a_co;"
+	"uniform vec4 uOffset;"	// Tile x/y, uv x/y
+	"uniform mat3 uPv;"
+	"uniform mat2 uSubTransform;"
+	""
+	"out vec4 aTexCoords;"
+	""
+	"vec2 hash22(vec2 p)"
+	"{"
+		"vec3 p3 = fract(vec3(p.xyx) * vec3(.1031, .1030, .0973));"
+		"p3 += dot(p3, p3.yzx+33.33);"
+		"return fract((p3.xx+p3.yz)*p3.zy);"
+	"}"
+	""
+	"void main()"
+	"{"
+		// Create texture coords
+		"vec2 random_offset = floor(hash22(uOffset.xy) * 4.0) * 0.25;"
+		"vec2 edge_safe_coords = a_co * 0.98 + 0.01;"
+		"aTexCoords = vec4((edge_safe_coords + uOffset.zw) * 0.25, edge_safe_coords * 0.25 + random_offset );"
+		
+		// Vertex transform
+		"vec2 subtransform = uSubTransform * (a_co-0.5) + 0.5;"
+		"vec3 worldpos = vec3( subtransform + uOffset.xy, 1.0 );"
+		"gl_Position = vec4( uPv * worldpos, 1.0 );"
+	"}",
+	
+	// FRAGMENT
+	"out vec4 FragColor;"
+	""
+	"uniform sampler2D uTexGlyphs;"
+	"uniform sampler2D uTexWood;"
+	""
+	"in vec4 aTexCoords;"
+	""
+	"void main()"
+	"{"
+		"vec3 shadowing_colour = vec3( 0.93, 0.88536, 0.8184 );"
+		"vec4 glyph = texture( uTexGlyphs, aTexCoords.xy );"
+		"vec4 wood = texture( uTexWood, aTexCoords.zw );"
+		"vec4 wood_secondary = texture( uTexWood, aTexCoords.zw + 0.25 );"
+		"vec3 wood_comp = mix( wood_secondary.rgb * shadowing_colour, wood.rgb, clamp( glyph.b * 2.0 - 1.0, 0.0, 1.0 ) );"
+		
+		"vec3 shadows = mix( vec3( 0.85, 0.7344, 0.561 ), vec3(1.0,1.0,1.0), glyph.r );"
+		
+		"FragColor = vec4( wood_comp * shadows, glyph.b );"
+	"}"
+	,
+	UNIFORMS({ "uPv", "uOffset", "uTexGlyphs", "uTexWood", "uSubTransform" })
+)
+
+const char *level_pack[] = 
+{
+	// Level 0
+	"#########;\n"
+	"###-#####;acac\n"
+	"##     ##;\n"
+	"##     ##;\n"
+	"##     ##;\n"
+	"##     ##;\n"
+	"#####+###;acac\n"
+	"#########;\n",
+	
+	// Level 1
+	"#########;\n"
+	"##-###-##;b,b\n"
+	"##     ##;\n"
+	"##     ##;\n"
+	"##     ##;\n"
+	"##     ##;\n"
+	"##     ##;\n"
+	"####+####;bb\n"
+	"#########;\n",
+	
+	// Level 2
+	"###########;\n"
+	"#####-#####;bbbbb\n"
+	"##       ##;\n"
+	"##      ###;\n"
+	"##  #    ##;\n"
+	"##       ##;\n"
+	"###+##+####;bbb,bb\n"
+	"###########;\n",
+	
+	// Level 3
+	"#############;\n"
+	"###-#####-###;a,aaa\n"
+	"##         ##;\n"
+	"##         ##;\n"
+	"##         ##;\n"
+	"##         ##;\n"
+	"##         ##;\n"
+	"##         ##;\n"
+	"######+######;aaaa\n"
+	"#############;\n",
+	
+	// Level 4
+	"#############;\n"
+	"###-#####-###;aaa,aa\n"
+	"##         ##;\n"
+	"##         ##;\n"
+	"##         ##;\n"
+	"##         ##;\n"
+	"##         ##;\n"
+	"##         ##;\n"
+	"###+#####+###;aa,aaa\n"
+	"#############;\n"
+};
+
+GLuint tex_tile_data;
+GLuint tex_tile_detail;
+GLuint tex_wood;
+GLuint tex_ball;
+
 m3x3f m_projection;
 m3x3f m_view;
 m3x3f m_mdl;
@@ -35,31 +186,138 @@ m3x3f m_mdl;
 #define FLAG_OUTPUT 0x2
 #define FLAG_CANAL 0x4
 #define FLAG_WALL 0x8
+#define FLAG_DROP_L 0x10
+#define FLAG_SPLIT 0x20
+#define FLAG_MERGER 0x40
+#define FLAG_DROP_R 0x80
+#define FLAG_FLIP_FLOP 0x100
+#define FLAG_FLIP_ROTATING 0x200
+
+/*
+	0000 0   | 0001 1   | 0010 2   | 0011 3
+			   |          |    |     |    |
+		X     | 	  X=    |    X     | 	X=
+			   |          |          |     
+	0100 4   | 0101 5   | 0110 6   | 0111 7
+			   |          |    |     |    |
+	  =X     |   =X=    |   =X     |   =X=
+			   |          |          |    
+	1000 8   | 1001 9   | 1010 10  | 1011 11
+		      |          |    |     |    |
+		X     |    X=    |    X     |    X=
+		|		|    |     |    |     |    |
+	1100 12  | 1101 13  | 1110 14  | 1111 15
+		      |          |    |     |    |
+	  =X     |   =X=    |   =X     |   =X=
+		|	   |    |     |    |     |    |
+*/
+
+enum cell_type
+{
+	k_cell_type_split = 7,
+	k_cell_type_merge = 13
+};
+
+v3f colour_sets[] =
+{ { 0.9f, 0.2f, 0.01f },
+  { 0.2f, 0.9f, 0.14f },
+  { 0.1f, 0.3f, 0.85f } };
+
+static void colour_code_v3( char cc, v3f target )
+{
+	if( cc >= 'a' && cc <= 'z' )
+	{
+		int id = cc - 'a';
+		
+		if( id < vg_list_size( colour_sets ) )
+		{
+			v3_copy( colour_sets[ id ], target );
+			return;
+		}
+	}
+	
+	v3_copy( (v3f){0.0f,0.0f,0.0f}, target );
+}
+
+struct mesh
+{
+	GLuint vao, vbo;
+	u32 elements;
+};
+
+static void init_mesh( struct mesh *m, float *tris, u32 length )
+{
+	m->elements = length/3;
+	glGenVertexArrays( 1, &m->vao );
+	glGenBuffers( 1, &m->vbo );
+	
+	glBindVertexArray( m->vao );
+	glBindBuffer( GL_ARRAY_BUFFER, m->vbo );
+	glBufferData( GL_ARRAY_BUFFER, length*sizeof(float), tris, GL_STATIC_DRAW );
+	
+	glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void*)0 );
+	glEnableVertexAttribArray( 0 );
+	
+	VG_CHECK_GL();
+}
+
+static void free_mesh( struct mesh *m )
+{
+	glDeleteVertexArrays( 1, &m->vao );
+	glDeleteBuffers( 1, &m->vbo );
+}
+
+static void draw_mesh( int const start, int const count )
+{
+	glDrawArrays( GL_TRIANGLES, start*3, count*3 );
+}
+
+static void use_mesh( struct mesh *m )
+{
+	glBindVertexArray( m->vao );
+}
 
 struct world
 {
 	struct cell
 	{
 		u32 state;
-		u8 water[2];
+		u8 config;
 	}
 	*data;
 	
 	u32 frame;
 	
+	u32 sim_frame;
+	float sim_start;
+	int simulating;
+	
 	struct cell_terminal
 	{
+		// TODO: Split into input/output structures
 		char *conditions;
+		char recv[12];
+		int recv_count;
 		int id;
 	}
 	*io;
 	
 	u32 w, h;
 	
-	GLuint tile_vao;
-	GLuint tile_vbo;
+	struct mesh tile, circle;
 	
 	int selected;
+	
+	struct fish
+	{
+		v2i pos;
+		v2i dir;
+		int alive;
+		char payload;
+	}
+	fishes[16];
+	
+	int num_fishes;
 } world = {};
 
 static void map_free(void)
@@ -171,8 +429,6 @@ static int map_load( const char *str )
 			
 			// Tile initialization
 			// row[ cx ] .. etc
-			row[ cx ].water[0] = 0;
-			row[ cx ].water[1] = 0;
 			
 			if( *c == '+' || *c == '-' )
 			{
@@ -198,67 +454,219 @@ static int map_load( const char *str )
 	return 1;
 }
 
+static struct cell *pcell( v2i pos )
+{
+	return &world.data[ pos[1]*world.w + pos[0] ];
+}
+
 int main( int argc, char *argv[] )
 {
-	vg_init( argc, argv, "FishLadder" );
+	vg_init( argc, argv, "Fish (Marbles Computer) Ladder Simulator 2022 | N,M: change level | SPACE: Test | LeftClick: Toggle tile" );
 }
 
 void vg_register(void)
 {
 	SHADER_INIT( shader_tile_colour );
+	SHADER_INIT( shader_tile_main );
+	SHADER_INIT( shader_ball );
 }
 
 void vg_start(void)
 {
-	glGenVertexArrays( 1, &world.tile_vao );
-	glGenBuffers( 1, &world.tile_vbo );
-	
-	float quad_mesh[] =
+	// Quad mesh
 	{
-		0.05f, 0.05f, 0.05f, 0.95f, 0.95f, 0.95f,
-		0.05f, 0.05f, 0.95f, 0.95f, 0.95f, 0.05f
-	};
+		float quad_mesh[] =
+		{
+			0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
+			0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f,
+			
+			0.48f, 0.48f, 0.5f, 0.52f, 0.52f, 0.52f, // Static dot
+			0.375f, 0.25f, 0.5f, 0.75f, 0.625f, 0.25f, // Downwards pointing arrow
+			0.25f, 0.625f, 0.75f, 0.5f, 0.25f, 0.375f, // Left
+			0.625f, 0.75f, 0.5f, 0.25f, 0.375f, 0.75f, // up
+			0.75f, 0.375f, 0.25f, 0.5f, 0.75f, 0.625f
+		};
+		
+		init_mesh( &world.tile, quad_mesh, vg_list_size(quad_mesh) );
+	}
 	
-	glBindVertexArray( world.tile_vao );
-	glBindBuffer( GL_ARRAY_BUFFER, world.tile_vbo );
-	glBufferData
-	(
-		GL_ARRAY_BUFFER,
-		sizeof( quad_mesh ),
-		quad_mesh,
-		GL_STATIC_DRAW
-	);
+	// Circle mesh
+	{
+		float circle_mesh[32*6*3];
+		int res = vg_list_size( circle_mesh ) / (6*3);
+
+		for( int i = 0; i < res; i ++ )
+		{
+			v2f v0 = { sinf( ((float)i/(float)res)*VG_TAUf ), cosf( ((float)i/(float)res)*VG_TAUf ) };
+			v2f v1 = { sinf( ((float)(i+1)/(float)res)*VG_TAUf ), cosf( ((float)(i+1)/(float)res)*VG_TAUf ) };
+		
+			circle_mesh[ i*6+0 ] = 0.0f;
+			circle_mesh[ i*6+1 ] = 0.0f;
+			
+			v2_copy( v0, circle_mesh + 32*6 + i*12 );
+			v2_muls( v0, 0.8f, circle_mesh + 32*6 + i*12+2 );
+			v2_copy( v1, circle_mesh + 32*6 + i*12+4 );
+			
+			v2_copy( v1, circle_mesh + 32*6 + i*12+6 );
+			v2_muls( v1, 0.8f, circle_mesh + 32*6 + i*12+8 );
+			v2_muls( v0, 0.8f, circle_mesh + 32*6 + i*12+10 );
+			
+			v2_copy( v0, circle_mesh + i*6+4 );
+			v2_copy( v1, circle_mesh + i*6+2 );
+			v2_copy( v0, circle_mesh+i*6+4 );
+			v2_copy( v1, circle_mesh+i*6+2 );
+		}
+		
+		init_mesh( &world.circle, circle_mesh, vg_list_size( circle_mesh ) );
+	}
 	
-	glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void*)0 );
-	glEnableVertexAttribArray( 0 );
+	// Textures
+	{
+		tex_tile_detail = vg_tex2d_rgba( "textures/tile_overlays.png" );
+		vg_tex2d_mipmap();
+		vg_tex2d_linear_mipmap();
+		vg_tex2d_repeat();
+		
+		tex_tile_data = vg_tex2d_rgba( "textures/tileset.png" );
+		vg_tex2d_mipmap();
+		vg_tex2d_linear_mipmap();
+		vg_tex2d_repeat();
+		
+		tex_wood = vg_tex2d_rgba( "textures/wood.png" );
+		vg_tex2d_mipmap();
+		vg_tex2d_linear_mipmap();
+		vg_tex2d_repeat();
+		
+		tex_ball = vg_tex2d_rgba( "textures/ball_metallic.png" );
+		vg_tex2d_mipmap();
+		vg_tex2d_linear_mipmap();
+		vg_tex2d_clamp();
+	}
 	
-	VG_CHECK_GL();	
-	
-	map_load
-	( 
-		"#############;\n"
-		"###-#####-###;aaa,aa\n"
-		"##         ##;\n"
-		"##         ##;\n"
-		"##         ##;\n"
-		"##         ##;\n"
-		"##         ##;\n"
-		"##         ##;\n"
-		"###+#####+###;aa,aaa\n"
-		"#############;\n"
-	);
+	map_load( level_pack[ 0 ] );
 }
 
 void vg_free(void)
 {
-	glDeleteVertexArrays( 1, &world.tile_vao );
-	glDeleteBuffers( 1, &world.tile_vbo );
+	free_mesh( &world.tile );
+	free_mesh( &world.circle );
 	
 	map_free();
+	
+	glDeleteTextures( 1, &tex_tile_data );
+	glDeleteTextures( 1, &tex_tile_detail );
+	glDeleteTextures( 1, &tex_wood );
+	glDeleteTextures( 1, &tex_ball );
+}
+
+static int cell_interactive( v2i co )
+{
+	// Bounds check
+	if( co[0] < 2 || co[0] >= world.w-2 || co[1] < 2 || co[1] >= world.h-2 )
+		return 0;
+
+	// Flags check
+	if( world.data[ world.w*co[1] + co[0] ].state & (FLAG_WALL|FLAG_INPUT|FLAG_OUTPUT) )
+		return 0;
+
+	// List of 3x3 configurations that we do not allow
+	static u32 invalid_src[][9] = 
+	{ 
+		{ 0,1,0,
+		  1,1,1,
+		  0,1,0 
+		},
+		{ 0,0,0,
+		  0,1,1,
+		  0,1,1
+		},
+		{ 0,0,0,
+		  1,1,0,
+		  1,1,0
+		},
+		{ 0,1,1,
+		  0,1,1,
+		  0,0,0
+		},
+		{ 1,1,0,
+		  1,1,0,
+		  0,0,0
+		},
+		{ 0,1,0,
+		  0,1,1,
+		  0,1,0
+		},
+		{ 0,1,0,
+		  1,1,0,
+		  0,1,0
+		}
+	};
+	
+	// Statically compile invalid configurations into bitmasks
+	static u32 invalid[ vg_list_size(invalid_src) ];
+	
+	for( int i = 0; i < vg_list_size(invalid_src); i ++ )
+	{
+		u32 comped = 0x00;
+	
+		for( int j = 0; j < 3; j ++ )
+			for( int k = 0; k < 3; k ++ )
+				comped |= invalid_src[i][ j*3+k ] << ((j*5)+k);
+		
+		invalid[i] = comped;
+	}
+
+	// Extract 5x5 grid surrounding tile
+	u32 blob = 0x1000;
+	for( int y = co[1]-2; y < co[1]+3; y ++ )
+		for( int x = co[0]-2; x < co[0]+3; x ++ )
+		{                
+			struct cell *cell = pcell((v2i){x,y});
+
+			if( cell && (cell->state & (FLAG_CANAL|FLAG_INPUT|FLAG_OUTPUT)) )
+				blob |= 0x1 << ((y-(co[1]-2))*5 + x-(co[0]-2));
+		}
+
+	// Run filter over center 3x3 grid to check for invalid configurations
+	int kernel[] = { 0, 1, 2, 5, 6, 7, 10, 11, 12 };
+	for( int i = 0; i < vg_list_size(kernel); i ++ )
+	{
+		if( blob & (0x1 << (6+kernel[i])) )
+		{
+			u32 window = blob >> kernel[i];
+
+			for( int j = 0; j < vg_list_size(invalid); j ++ )
+				if((window & invalid[j]) == invalid[j])
+			return 0;
+		}
+	}
+
+	return 1;
 }
 
 void vg_update(void)
 {
+	static int curlevel = 0;
+	int changelvl = curlevel;
+	if( vg_get_button_down( "prev" ) ) { if( curlevel > 0 ) changelvl --; }
+	else if( vg_get_button_down( "next" ) ) { if( curlevel < vg_list_size( level_pack )-1 ) changelvl ++; }
+	
+	if( changelvl != curlevel )
+	{
+		map_load( level_pack[ changelvl ] );
+		curlevel = changelvl;
+		
+		// TEMP!!! code dupe
+		world.simulating = 0;
+		world.num_fishes = 0;
+		world.sim_frame = 0;
+		
+		for( int i = 0; i < arrlen( world.io ); i ++ )
+			world.io[i].recv_count = 0;
+		
+		vg_info( "Stopping simulation!\n" );
+	}
+	
 	float ratio = (float)vg_window_y / (float)vg_window_x;
 	float const size = 9.5f;
 	
@@ -267,85 +675,251 @@ void vg_update(void)
 	origin[1] = -0.5f * world.h;
 	origin[2] = 0.0f;
 	
-	m3x3_projection( m_projection, -size, size, size*ratio, -size*ratio );
+	m3x3_projection( m_projection, -size, size, -size*ratio, size*ratio );
 	m3x3_identity( m_view );
 	m3x3_translate( m_view, origin );
 	m3x3_mul( m_projection, m_view, vg_pv );
 	vg_projection_update();
 	
+	// Input stuff
+	
 	v2f tile_pos;
 	v2_copy( vg_mouse_ws, tile_pos );
 	
 	int tile_x = floorf( tile_pos[0] );
 	int tile_y = floorf( tile_pos[1] );
-	
-	if( tile_x >= 2 && tile_x < world.w-2 && tile_y >= 2 && tile_y <= world.h-2 )
+
+	// Tilemap editing
+	if( !world.simulating )
 	{
-		world.selected = tile_y * world.w + tile_x;
-		
-		struct cell *cell = &world.data[tile_y*world.w+tile_x];
-		if( cell->state & (FLAG_WALL|FLAG_INPUT|FLAG_OUTPUT) )
+		if( cell_interactive( (v2i){ tile_x, tile_y } ))
 		{
+			world.selected = tile_y * world.w + tile_x;
+			
+			if( vg_get_button_down("primary") )
+			{
+				world.data[ world.selected ].state ^= FLAG_CANAL;
+			}
+		}
+		else
 			world.selected = -1;
+	}
+	
+	// Simulation stop/start
+	if( vg_get_button_down("go") )
+	{
+		if( world.simulating )
+		{
+			world.simulating = 0;
+			world.num_fishes = 0;
+			world.sim_frame = 0;
+			
+			for( int i = 0; i < arrlen( world.io ); i ++ )
+				world.io[i].recv_count = 0;
+			
+			vg_info( "Stopping simulation!\n" );
 		}
 		else
 		{
-			if( vg_get_button_down("primary") )
+			vg_success( "Starting simulation!\n" );
+			
+			world.simulating = 1;
+			world.num_fishes = 0;
+			world.sim_frame = 0;
+			world.sim_start = vg_time;
+			
+			for( int i = 0; i < world.w*world.h; i ++ )
 			{
-				cell->state ^= FLAG_CANAL;
+				world.data[ i ].state &= ~FLAG_FLIP_FLOP;
 			}
+			
+			for( int i = 0; i < arrlen( world.io ); i ++ )
+				world.io[i].recv_count = 0;
 		}
 	}
-	else
-		world.selected = -1;
 	
-	// Simulate world
-	static int update_tick = 0;
-	update_tick ++;
+	// Simulation stuff
+	// ========================================================
 	
-	if( update_tick > 5 )
+	for( int y = 2; y < world.h-2; y ++ )
 	{
-		update_tick = 0;
-		
-		u32 buffer_id = world.frame & 0x1;
-		u32 buffer_next = buffer_id ^ 0x1;
+		for( int x = 2; x < world.w-2; x ++ )
+		{
+			v2i dirs[] = {{1,0},{0,1},{-1,0},{0,-1}};
+			
+			u8 config = 0x00;
+			
+			if( pcell((v2i){x,y})->state & FLAG_CANAL )
+			{
+				for( int i = 0; i < vg_list_size( dirs ); i ++ )
+				{
+					struct cell *neighbour = pcell((v2i){x+dirs[i][0], y+dirs[i][1]});
+					if( neighbour->state & (FLAG_CANAL|FLAG_INPUT|FLAG_OUTPUT) )
+						config |= 0x1 << i;
+				}
+			} else config = 0xF;
+			
+			pcell((v2i){x,y})->config = config;
+			pcell((v2i){x,y})->state &= ~(FLAG_DROP_L|FLAG_DROP_R|FLAG_SPLIT|FLAG_MERGER);
+		}
+	}
+	
+	for( int y = 2; y < world.h-2; y ++ )
+		for( int x = 2; x < world.w-2; x ++ )
+		{
+			// R,D,L,-   1110 (splitter, 1 drop created)
+			
+			// R,-,L,U - 1011 (merger, 2 drop created)
+			
+			u8 config = pcell((v2i){x,y})->config;
+			
+			if( config == k_cell_type_split ) // splitter
+			{
+				struct cell *cell = pcell((v2i){x,y});
+			
+				cell->state |= (FLAG_SPLIT | FLAG_DROP_L | FLAG_DROP_R);
+			}
+			else if( config == k_cell_type_merge )
+			{
+				world.data[y*world.w+x-1].state |= FLAG_DROP_R;
+				world.data[y*world.w+x+1].state |= FLAG_DROP_L;
+				world.data[y*world.w+x].state |= FLAG_MERGER;
+			}
+		}
 		
-		for( int y = 1; y < world.h-1; y ++ )
+	// Fish ticks
+	if( world.simulating )
+	{
+		while( world.sim_frame < (int)((vg_time-world.sim_start)*2.0f) )
 		{
-			for( int x = 1; x < world.w-1; x ++ )
+			vg_info( "frame: %u\n", world.sim_frame );
+			
+			for( int i = 0; i < arrlen( world.io ); i ++ )
 			{
-				struct cell *cell = &world.data[y*world.w+x];
+				struct cell_terminal *term = &world.io[ i ];
+				int posx = term->id % world.w;
+				int posy = (term->id - posx)/world.w;
+				int is_input = world.data[ term->id ].state & FLAG_INPUT;
+				
+				if( is_input )
+				{
+					if( world.sim_frame < arrlen( term->conditions ) )
+					{
+						struct fish *fish = &world.fishes[world.num_fishes++];
+						fish->pos[0] = posx;
+						fish->pos[1] = posy;
+						fish->alive = 1;
+						fish->payload = term->conditions[world.sim_frame];
+						
+						int can_spawn = 0;
+						
+						v2i dirs[] = {{1,0},{-1,0},{0,-1}};
+						for( int j = 0; j < vg_list_size(dirs); j ++ )
+							if( pcell( (v2i){ posx+dirs[j][0], posy+dirs[j][1] } )->state & FLAG_CANAL )
+							{
+								fish->dir[0] = dirs[j][0];
+								fish->dir[1] = dirs[j][1];
+								can_spawn = 1;
+								break;
+							}
+						
+						if( !can_spawn )
+							world.num_fishes--;
+					}
+				}
+			}
+			
+			// Update splitter deltas
+			for( int i = 0; i < world.h*world.w; i ++ )
+			{
+				struct cell *cell = &world.data[i];
+				if( cell->config == k_cell_type_split )
+				{
+					cell->state &= ~FLAG_FLIP_ROTATING;
+				}
+			}
 
-				if( cell->state & FLAG_INPUT )
-					cell->water[ buffer_next ] = 8;
-				else
+			for( int i = 0; i < world.num_fishes; i ++ )
+			{
+				struct fish *fish = &world.fishes[i];
+				struct cell *cell_current = pcell( fish->pos );
+				
+				if( !fish->alive )
+					continue;
+				
+				// Apply to output
+				if( cell_current->state & FLAG_OUTPUT )
 				{
-					int has_source = 0;
-					cell->water[ buffer_next ] = 0;	
+					for( int j = 0; j < arrlen( world.io ); j ++ )
+					{
+						struct cell_terminal *term = &world.io[j];
+						
+						if( term->id == fish->pos[1]*world.w + fish->pos[0] )
+						{
+							term->recv[ term->recv_count ++ ] = fish->payload;
+							break;
+						}
+					}
 					
-					if( cell->state & FLAG_CANAL )
+					fish->alive = 0;
+					continue;
+				}
+				
+				if( !(cell_current->state & (FLAG_INPUT|FLAG_CANAL)) )
+				{
+					fish->alive = 0;
+				}
+				else
+				{
+					if( cell_current->state & FLAG_SPLIT )
 					{
-						v2i dirs[] = {{1,0},{0,1},{-1,0},{0,-1}};
+						// Flip flop L/R
+						fish->dir[0] = cell_current->state&FLAG_FLIP_FLOP?1:-1;
+						fish->dir[1] = 0;
 						
-						for( int i = 0; i < vg_list_size( dirs ); i ++ )
+						cell_current->state ^= FLAG_FLIP_FLOP;
+					}
+					else if( cell_current->state & FLAG_MERGER )
+					{
+						// Can only move up
+						fish->dir[0] = 0;
+						fish->dir[1] = -1;
+					}
+					else
+					{
+						struct cell *cell_next = pcell( (v2i){ fish->pos[0]+fish->dir[0], fish->pos[1]+fish->dir[1] } );
+						if( !(cell_next->state & (FLAG_CANAL|FLAG_OUTPUT)) )
 						{
-							struct cell *neighbour = &world.data[(y+dirs[i][1])*world.w+x+dirs[i][0]];
+							// Try other directions for valid, so down, left, right..
+							v2i dirs[] = {{1,0},{-1,0},{0,-1}};
+							vg_info( "Trying some other directions...\n" );
 							
-							if( neighbour->water[ buffer_id ] > cell->water[ buffer_next ]+1 )
+							for( int j = 0; j < vg_list_size(dirs); j ++ )
 							{
-								has_source = 1;
-								cell->water[ buffer_next ] = neighbour->water[ buffer_id ]-1;
+								if( (dirs[j][0] == -fish->dir[0]) && (dirs[j][1] == -fish->dir[1]) )
+									continue;
+							
+								if( pcell( (v2i){ fish->pos[0]+dirs[j][0], fish->pos[1]+dirs[j][1] } )->state & (FLAG_CANAL|FLAG_OUTPUT) )
+								{
+									fish->dir[0] = dirs[j][0];
+									fish->dir[1] = dirs[j][1];
+								}
 							}
 						}
 					}
 					
-					if( !has_source && cell->water[ buffer_id ] )
-						cell->water[ buffer_next ] = cell->water[ buffer_id ]-1;
+					fish->pos[0] += fish->dir[0];
+					fish->pos[1] += fish->dir[1];
+					
+					struct cell *cell_entry = pcell( fish->pos );
+					
+					if( cell_entry->config == k_cell_type_split )
+						cell_entry->state |= FLAG_FLIP_ROTATING;
 				}
 			}
+			
+			world.sim_frame ++;
 		}
-		
-		world.frame ++;
 	}
 }
 
@@ -354,40 +928,265 @@ void vg_render(void)
 	glViewport( 0,0, vg_window_x, vg_window_y );
 
 	glDisable( GL_DEPTH_TEST );
-	glClearColor( 0.01f, 0.01f, 0.01f, 1.0f );
+	glClearColor( 0.8f, 0.8f, 0.8f, 1.0f );
 	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 	
-	glBindVertexArray( world.tile_vao );
-	SHADER_USE( shader_tile_colour );
-	glUniformMatrix3fv( SHADER_UNIFORM( shader_tile_colour, "uPv" ), 1, GL_FALSE, (float *)vg_pv );
+	float scaled_time = 0.0f, frame_lerp = 0.0f;
+	
+	if( world.simulating )
+	{
+		scaled_time = (vg_time-world.sim_start)*2.0f;
+		frame_lerp = scaled_time - (float)world.sim_frame;
+	}
+	
+	v2f const curve_3[] = {{0.5f,1.0f},{0.5f,0.625f},{0.625f,0.5f},{1.0f,0.5f}};
+	v2f const curve_6[] = {{0.5f,1.0f},{0.5f,0.625f},{0.375f,0.5f},{0.0f,0.5f}};
+	v2f const curve_9[] = {{1.0f,0.5f},{0.625f,0.5f},{0.5f,0.375f},{0.5f,0.0f}};
+	v2f const curve_12[]= {{0.0f,0.5f},{0.375f,0.5f},{0.5f,0.375f},{0.5f,0.0f}};
+	
+	v2f const curve_7[] = {{0.5f,0.8438f},{0.875f,0.8438f},{0.625f,0.5f},{1.0f,0.5f}};
+	v2f const curve_7_1[] = {{0.5f,0.8438f},{1.0f-0.875f,0.8438f},{1.0-0.625f,0.5f},{0.0f,0.5f}};
+	
+	float const curve_7_linear_section = 0.1562f;
+	
+	// TILE SET RENDERING
+	// ======================================================================
+	use_mesh( &world.tile );
+	SHADER_USE( shader_tile_main );
+
+	m2x2f subtransform;
+	m2x2_identity( subtransform );
+	glUniformMatrix2fv( SHADER_UNIFORM( shader_tile_main, "uSubTransform" ), 1, GL_FALSE, (float *)subtransform );	
+	glUniformMatrix3fv( SHADER_UNIFORM( shader_tile_main, "uPv" ), 1, GL_FALSE, (float *)vg_pv );
+	
+	// Bind textures
+	glActiveTexture( GL_TEXTURE0 );
+	glBindTexture( GL_TEXTURE_2D, tex_tile_data );
+	glUniform1i( SHADER_UNIFORM( shader_tile_main, "uTexGlyphs" ), 0 );
+	
+	glActiveTexture( GL_TEXTURE1 );
+	glBindTexture( GL_TEXTURE_2D, tex_wood );
+	glUniform1i( SHADER_UNIFORM( shader_tile_main, "uTexWood" ), 1 );
+	
+	for( int y = 0; y < world.h; y ++ )
+	{
+		for( int x = 0; x < world.w; x ++ )
+		{
+			struct cell *cell = pcell((v2i){x,y});
+			int selected = world.selected == y*world.w + x;
+			
+			int tile_offsets[][2] =
+			{
+				{2, 0}, {0, 3}, {0, 2}, {2, 2},
+				{1, 0}, {2, 3}, {3, 2}, {1, 3},
+				{3, 1}, {0, 1}, {1, 2}, {2, 1},
+				{1, 1}, {3, 3}, {2, 1}, {2, 1}
+			};
+			
+			int uv[2] = { 3, 0 };
+			
+			if( cell->state & FLAG_CANAL )
+			{
+				uv[0] = tile_offsets[ cell->config ][0];
+				uv[1] = tile_offsets[ cell->config ][1];
+			}
+			
+			glUniform4f( SHADER_UNIFORM( shader_tile_main, "uOffset" ), (float)x, (float)y, uv[0], uv[1] );
+			draw_mesh( 0, 2 );
+		}
+	}
+
+	//	Draw splitters
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glBlendEquation(GL_FUNC_ADD);
 	
 	for( int y = 0; y < world.h; y ++ )
 	{
 		for( int x = 0; x < world.w; x ++ )
 		{
-			glUniform2f( SHADER_UNIFORM( shader_tile_colour, "uOffset" ), (float)x, (float)y );
+			struct cell *cell = pcell((v2i){x,y});
+			
+			if( cell->state & FLAG_SPLIT )
+			{
+				float rotation = cell->state & FLAG_FLIP_FLOP? vg_rad( -45.0f ): vg_rad( 45.0f );
+				
+				if( cell->state & FLAG_FLIP_ROTATING )
+				{
+					if( (frame_lerp > curve_7_linear_section) )
+					{
+						float const rotation_speed = 0.4f;
+						if( (frame_lerp < 1.0f-rotation_speed) )
+						{
+							float t = frame_lerp - curve_7_linear_section;
+							t *= -2.0f * (1.0f/(1.0f-(curve_7_linear_section+rotation_speed)));
+							t += 1.0f;
+							
+							rotation *= t;
+						}
+						else
+							rotation *= -1.0f;
+					}
+				}
+
+				m2x2_create_rotation( subtransform, rotation );
+
+				glUniformMatrix2fv( SHADER_UNIFORM( shader_tile_main, "uSubTransform" ), 1, GL_FALSE, (float *)subtransform );	
+				glUniform4f( SHADER_UNIFORM( shader_tile_main, "uOffset" ), (float)x, (float)y + 0.125f, 0.0f, 0.0f );
+				draw_mesh( 0, 2 );
+			}
+		}
+	}
+	
+	//glDisable(GL_BLEND);
+	
+	SHADER_USE( shader_ball );
+	glUniformMatrix3fv( SHADER_UNIFORM( shader_ball, "uPv" ), 1, GL_FALSE, (float *)vg_pv );
+	
+	glActiveTexture( GL_TEXTURE0 );
+	glBindTexture( GL_TEXTURE_2D, tex_ball );
+	glUniform1i( SHADER_UNIFORM( shader_ball, "uTexMain" ), 0 );
+	
+	// Draw 'fish'
+	if( world.simulating )
+	{
+		for( int i = 0; i < world.num_fishes; i ++ )
+		{
+			struct fish *fish = &world.fishes[i];
+			
+			if( !fish->alive )
+				continue;
+
+			// Evaluate position
+			struct cell *cell = pcell(fish->pos);
+			v2f fish_pos;
+			
+			v2f const *curve;
 			
-			v4f colour;
+			float t = frame_lerp;
 			
-			struct cell *cell = &world.data[y*world.w+x];
+			switch( cell->config )
+			{
+				case 13:
+					if( fish->dir[0] == 1 )
+						curve = curve_12;
+					else
+						curve = curve_9;
+				break;
+				case 3: curve = curve_3; break;
+				case 6: curve = curve_6; break;
+				case 9: curve = curve_9; break;
+				case 12: curve = curve_12; break;
+				case 7:
+					if( t > curve_7_linear_section )
+					{
+						t -= curve_7_linear_section;
+						t *= (1.0f/(1.0f-curve_7_linear_section));
+						
+						curve = cell->state & FLAG_FLIP_FLOP? curve_7: curve_7_1;
+					}
+					else curve = NULL;
+				break;
+				default: curve = NULL; break;
+			}
 			
-			if( cell->state & FLAG_WALL ) { v4_copy( (v4f){ 0.2f, 0.2f, 0.2f, 1.0f }, colour ); }
-			else if( cell->state & FLAG_CANAL ) { v4_copy( (v4f){ 0.6f, 0.6f, 0.6f, 1.0f }, colour ); }
-			else if( cell->state & FLAG_INPUT ) { v4_copy( (v4f){ 0.2f, 0.3f, 0.7f, 1.0f }, colour ); }
-			else if( cell->state & FLAG_OUTPUT ) { v4_copy( (v4f){ 0.2f, 0.7f, 0.3f, 1.0f }, colour ); }
-			else v4_copy( (v4f){ 0.9f, 0.9f, 0.9f, 1.0f }, colour );
+			if( curve )
+			{
+				float t2 = t * t;
+				float t3 = t * t * t;
+
+				float cA = 3.0f*t2 - 3.0f*t3;
+				float cB = 3.0f*t3 - 6.0f*t2 + 3.0f*t;
+				float cC = 3.0f*t2 - t3 - 3.0f*t + 1.0f;
+
+				fish_pos[0] = t3*curve[3][0] + cA*curve[2][0] + cB*curve[1][0] + cC*curve[0][0];
+				fish_pos[1] = t3*curve[3][1] + cA*curve[2][1] + cB*curve[1][1] + cC*curve[0][1];
+				fish_pos[0] += (float)fish->pos[0];
+				fish_pos[1] += (float)fish->pos[1];
+			}
+			else
+			{
+				v2f origin;
+				origin[0] = (float)fish->pos[0] + (float)fish->dir[0]*-0.5f + 0.5f;
+				origin[1] = (float)fish->pos[1] + (float)fish->dir[1]*-0.5f + 0.5f;
+				
+				fish_pos[0] = origin[0] + (float)fish->dir[0]*t;
+				fish_pos[1] = origin[1] + (float)fish->dir[1]*t;
+			}
 			
-			if( cell->water[world.frame&0x1] )
-				v4_copy( (v4f){ 0.2f, 0.3f, 0.7f * (float)(cell->water[world.frame&0x1]) * (1.0f/8.0f), 1.0f }, colour );
+			v4f dot_colour = { 0.0f, 0.0f, 0.0f, 1.0f };
+			colour_code_v3( fish->payload, dot_colour );
 			
-			if( world.selected == y*world.w + x )
-				v3_muls( colour, sinf( vg_time )*0.25f + 0.5f, colour );
+			glUniform3fv( SHADER_UNIFORM( shader_ball, "uColour" ), 1, dot_colour );
+			glUniform2f( SHADER_UNIFORM( shader_ball, "uOffset" ), fish_pos[0], fish_pos[1] );
+			draw_mesh( 0, 32 );
+		}
+	}
+	
+	glDisable(GL_BLEND);
+
+	SHADER_USE( shader_tile_colour );
+	glUniformMatrix3fv( SHADER_UNIFORM( shader_tile_colour, "uPv" ), 1, GL_FALSE, (float *)vg_pv );
+	use_mesh( &world.circle );
+	
+	// Draw i/o arrays
+	for( int i = 0; i < arrlen( world.io ); i ++ )
+	{
+		struct cell_terminal *term = &world.io[ i ];
+		int posx = term->id % world.w;
+		int posy = (term->id - posx)/world.w;
+		int is_input = world.data[ term->id ].state & FLAG_INPUT;
+		
+		int const filled_start = 0;
+		int const filled_count = 32;
+		int const empty_start = 32;
+		int const empty_count = 32*2;
+		
+		v4f dot_colour = { 0.0f, 0.0f, 0.0f, 1.0f };
+		
+		for( int j = 0; j < arrlen( term->conditions ); j ++ )
+		{
+			glUniform3f( SHADER_UNIFORM( shader_tile_colour, "uOffset" ), (float)posx + 0.2f + 0.2f * (float)j, (float)posy + 0.2f, 0.1f );
 			
-			glUniform4fv( SHADER_UNIFORM( shader_tile_colour, "uColour" ), 1, colour );
+			if( is_input )
+			{
+				colour_code_v3( term->conditions[j], dot_colour );
+				glUniform4fv( SHADER_UNIFORM( shader_tile_colour, "uColour" ), 1, dot_colour );
 			
-			glDrawArrays( GL_TRIANGLES, 0, 6 );
+				// Draw filled if tick not passed, draw empty if empty
+				if( world.sim_frame > j )
+					draw_mesh( empty_start, empty_count );
+				else
+					draw_mesh( filled_start, filled_count );
+			}
+			else
+			{
+				if( term->recv_count > j )
+				{
+					colour_code_v3( term->recv[j], dot_colour );
+					v3_muls( dot_colour, 0.8f, dot_colour );
+					glUniform4fv( SHADER_UNIFORM( shader_tile_colour, "uColour" ), 1, dot_colour );
+					
+					draw_mesh( filled_start, filled_count );
+				}
+				
+				colour_code_v3( term->conditions[j], dot_colour );
+				glUniform4fv( SHADER_UNIFORM( shader_tile_colour, "uColour" ), 1, dot_colour );
+				
+				draw_mesh( empty_start, empty_count );
+			}
 		}
 	}
+	
+	if( world.simulating )
+	{
+		glUniform4f( SHADER_UNIFORM( shader_tile_colour, "uColour" ), 0.0f, 0.0f, 0.0f, 1.0f );
+		glUniform3f( SHADER_UNIFORM( shader_tile_colour, "uOffset" ), -0.5f + cosf( vg_time * 4.0f ) * 0.2f, sinf( vg_time * 4.0f ) * 0.2f + (float)world.h * 0.5f, 0.05f );
+		draw_mesh( 0, 32 );
+	}
 }
 
-void vg_ui(void){}
+void vg_ui(void)
+{
+	//ui_test();
+}