Implemented elevation in-game with sprites

core/assets/shaders/water.fragment

@@ -48,7 +48,7 @@ float snoise(vec2 v){
 void main() {
 
 	vec2 c = v_texCoord.xy;
-	vec4 color = texture2D(u_texture, c);
+	vec4 color = texture2D(u_texture, c) * v_color;
 
 	vec2 v = vec2(1.0/screensize.x, 1.0/screensize.y);
 	ivec2 icoords = ivec2(int(c.x / v.x + camerapos.x), int(c.y / v.y + camerapos.y));

core/src/io/anuke/mindustry/world/Build.java

@@ -191,14 +191,14 @@ public class Build {
             for (int dx = 0; dx < type.size; dx++) {
                 for (int dy = 0; dy < type.size; dy++) {
                     Tile other = world.tile(x + dx + offsetx, y + dy + offsety);
-                    if (other == null || (other.block() != Blocks.air && !other.block().alwaysReplace)  || !other.floor().placeableOn) {
+                    if (other == null || (other.block() != Blocks.air && !other.block().alwaysReplace) || other.cliffs != 0  || !other.floor().placeableOn) {
                         return false;
                     }
                 }
             }
             return true;
         } else {
-            return (tile.getTeam() == Team.none || tile.getTeam() == team) && tile.floor().placeableOn
+            return (tile.getTeam() == Team.none || tile.getTeam() == team) && tile.floor().placeableOn && tile.cliffs == 0
                     && ((type.canReplace(tile.block()) && !(type == tile.block() && rotation == tile.getRotation() && type.rotate)) || tile.block().alwaysReplace || tile.block() == Blocks.air)
                     && tile.block().isMultiblock() == type.isMultiblock() && type.canPlaceOn(tile);
         }

core/src/io/anuke/mindustry/world/Tile.java

@@ -311,16 +311,35 @@ public class Tile implements PosTrait, TargetTrait {
 		cost = 1;
 		cliffs = 0;
 		boolean occluded = false;
+
+		//check for occlusion
 		for(int i = 0; i < 8; i ++){
 			GridPoint2 point = Geometry.d8[i];
 			Tile tile = world.tile(x + point.x, y + point.y);
-			if(tile != null){
+			if(tile != null && tile.solid()){
-				if(tile.solid()){
 				occluded = true;
+				break;
 			}
-				if(tile.elevation < elevation){
-					cliffs |= (0x1 << i);
 		}
+
+		//check for bitmasking cliffs
+		for(int i = 0; i < 4; i ++){
+			GridPoint2 pc = Geometry.d4[i];
+			GridPoint2 pe = Geometry.d8edge[i];
+
+			Tile tc = world.tile(x + pc.x, y + pc.y);
+			Tile te = world.tile(x + pe.x, y + pe.y);
+			Tile tex = world.tile(x, y + pe.y);
+			Tile tey = world.tile(x + pe.x, y);
+
+			//check for cardinal direction elevation changes and bitmask that
+			if(tc != null && tc.elevation < elevation){
+				cliffs |= (1 << (i*2));
+			}
+
+			//check for corner bitmasking
+			if(te != null && tex != null && tey != null && te.elevation < elevation && tex.elevation < elevation && tey.elevation < elevation){
+				cliffs |= (1 << (i*2 + 1));
 			}
 		}
 		if(occluded){

core/src/io/anuke/mindustry/world/blocks/Floor.java

@@ -4,6 +4,7 @@ import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.g2d.TextureRegion;
 import com.badlogic.gdx.math.MathUtils;
 import com.badlogic.gdx.math.Vector2;
+import com.badlogic.gdx.utils.IntIntMap;
 import io.anuke.mindustry.content.StatusEffects;
 import io.anuke.mindustry.content.fx.BlockFx;
 import io.anuke.mindustry.type.Liquid;
@@ -16,11 +17,19 @@ import io.anuke.ucore.graphics.Draw;
 import io.anuke.ucore.util.Geometry;
 import io.anuke.ucore.util.Mathf;
 
+import static io.anuke.mindustry.Vars.tilesize;
 import static io.anuke.mindustry.Vars.world;
 
 public class Floor extends Block{
+	protected static IntIntMap bitmask = Mathf.mapInt(2, 1, 8, 2, 10, 3, 11, 4, 16, 5, 18, 6, 22, 7, 24, 8,
+			26, 9, 27, 10, 30, 11, 31, 12, 64, 13, 66, 14, 72, 15, 74, 16, 75, 17, 80, 18,
+			82, 19, 86, 20, 88, 21, 90, 22, 91, 23, 94, 24, 95, 25, 104, 26, 106, 27, 107, 28,
+			120, 29, 122, 30, 123, 31, 126, 32, 127, 33, 208, 34, 210, 35, 214, 36, 216, 37,
+			218, 38, 219, 39, 222, 40, 223, 41, 248, 42, 250, 43, 251, 44, 254, 45, 255, 46, 0, 47);
+
 	protected TextureRegion edgeRegion;
 	protected TextureRegion[] edgeRegions;
+	protected TextureRegion[] cliffRegions;
 	protected Vector2[] offsets;
 	protected Predicate<Block> blends = block -> block != this;
 	protected boolean blend = true;
@@ -80,6 +89,20 @@ public class Floor extends Block{
 				edgeRegions[i] = result;
 				offsets[i] = new Vector2(-4 + rx, -4 + ry);
 			}
+
+			if(Draw.hasRegion(name + "-cliff")){
+				cliffRegions = new TextureRegion[8];
+				TextureRegion base = Draw.region(name + "-cliff");
+
+				for(int i = 0; i < 8; i ++){
+					int dx = Geometry.d8[i].x, dy = Geometry.d8[i].y;
+
+					TextureRegion region = new TextureRegion();
+					region.setTexture(base.getTexture());
+					region.setRegion(base.getRegionX() + tilesize + tilesize*dx, base.getRegionY() + tilesize - tilesize*dy, tilesize, tilesize);
+					cliffRegions[i] = region;
+				}
+			}
 		}
 	}
 
@@ -105,11 +128,32 @@ public class Floor extends Block{
 
 		Draw.rect(variants > 0 ? (name() + MathUtils.random(1, variants))  : name(), tile.worldx(), tile.worldy());
 
+		if(Draw.hasRegion(name + "-cliff-side") && tile.cliffs != 0){
+			for(int i = 0; i < 4; i ++){
+				if((tile.cliffs & (1 << i*2)) != 0) {
+					Draw.colorl(i > 1 ? 0.6f : 1f);
+
+					boolean above = (tile.cliffs & (1 << ((i+1)%4)*2)) != 0, below = (tile.cliffs & (1 << (Mathf.mod(i-1, 4))*2)) != 0;
+
+					if(above && below){
+						Draw.rect(name + "-cliff-edge-2", tile.worldx(), tile.worldy(), i * 90);
+					}else if(above){
+						Draw.rect(name + "-cliff-edge", tile.worldx(), tile.worldy(), i * 90);
+					}else if(below){
+						Draw.rect(name + "-cliff-edge-1", tile.worldx(), tile.worldy(), i * 90);
+					}else{
+						Draw.rect(name + "-cliff-side", tile.worldx(), tile.worldy(), i * 90);
+					}
+				}
+			}
+		}
+		Draw.reset();
+
 		drawEdges(tile, false);
 	}
 
 	private void drawEdges(Tile tile, boolean sameLayer){
-		if(!blend) return;
+		if(!blend || tile.cliffs > 0) return;
 
 		for(int i = 0; i < 8; i ++){
 			int dx = Geometry.d8[i].x, dy = Geometry.d8[i].y;