Bag preview rendering, bag randomization

src/bag.zig

@@ -1,43 +1,56 @@
+const std = @import("std");
+
 const Piece = @import("piece.zig");
 
 const Self = @This();
 
 contents: [14]?Piece.Type,
+prng: std.rand.DefaultPrng,
 
 pub fn init() Self {
+
     var ret = Self{
         .contents = undefined,
+        .prng = std.rand.DefaultPrng.init(@intCast(u64, std.time.milliTimestamp())),
     };
     // We must fill all of the array
-    for (ret.contents[0..6]) |_, i| {
+    for (ret.contents[0..7]) |_, i| {
+        std.debug.print("Bag: {any}\n", .{ret.contents});
         ret.contents[i] = @intToEnum(Piece.Type, i);
     }
-    // Then we would shuffle
+    // Then we shuffle
+    ret.prng.random().shuffle(?Piece.Type, ret.contents[0..7]);
 
-    for (ret.contents[7..13]) |_, i| {
+    for (ret.contents[7..14]) |_, i| {
+        std.debug.print("Bag: {any}\n", .{ret.contents});
         ret.contents[i + 7] = @intToEnum(Piece.Type, i);
     }
-    // Then we would shuffle
+    // Then we shuffle
+    ret.prng.random().shuffle(?Piece.Type, ret.contents[7..14]);
 
     return ret;
 }
 
 pub fn pop(self: *Self) Piece.Type {
-    var ret = Piece.Type.i;
+    var ret = Piece.Type.i; // TODO
     if (self.contents[0]) |head| {
         ret = head;
         for (self.contents) |_, i| {
+            //std.debug.print("Bag: {any}\n", .{self.contents});
+            if (i + 1 >= self.contents.len) {
+                break;
+            }
             if (self.contents[i + 1]) |next| {
                 self.contents[i] = next;
                 self.contents[i + 1] = null;
             } else break;
         }
         if (self.contents[7] == null) {
-            for (self.contents[7..13]) |_, i| {
+            for (self.contents[7..14]) |_, i| {
                 self.contents[i + 7] = @intToEnum(Piece.Type, i);
             }
+        self.prng.random().shuffle(?Piece.Type, self.contents[7..14]);
         }
-        // Then we would shuffle
 
     }
     return ret;

src/game.zig

@@ -5,6 +5,7 @@ const Grid = @import("grid.zig");
 const Piece = @import("piece.zig");
 const Bag = @import("bag.zig");
 
+const preview = @import("preview.zig");
 const movement = @import("movement.zig");
 
 const Self = @This();
@@ -44,10 +45,12 @@ fn render(self: Self) void {
     if (self.piece) |safe_piece| {
         safe_piece.render(self.renderer, self.grid_cell_size, self.grid_pos_x, self.grid_pos_y);
     }
+    preview.render(self.renderer, self.bag, self.grid_cell_size, self.grid_pos_x + self.grid_cell_size * (Grid.ncolumns + 1), self.grid_pos_y);
 }
 pub fn tick(self: *Self) void {
     if (self.piece) |safe_piece| {
-        std.debug.print("Piece: Col: {} Row: {}\n", .{ safe_piece.col, safe_piece.row });
+        //std.debug.print("Piece: Col: {} Row: {}\n", .{ safe_piece.col, safe_piece.row });
+        //std.debug.print("Bag: {any}\n", .{self.bag.contents});
 
         var key_state = SDL.SDL_GetKeyboardState(null);
 

src/movement.zig

@@ -4,66 +4,34 @@ const Piece = @import("piece.zig");
 pub fn moveRight(grid: Grid, piece: Piece) Piece {
     var new_piece = piece;
     new_piece.col += 1;
-    for (new_piece.structure) |_, y| {
-        for (new_piece.structure[y]) |_, x| {
-            if (new_piece.structure[y][x] and
-                @intCast(i32, x) + new_piece.col > Grid.ncolumns - 1)
-            {
+    if (checkCollision(grid, new_piece)) {
         return piece;
-            }
-            if (new_piece.structure[y][x] and
-                !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free)
-            {
-                return piece;
-            }
-        }
-    }
+    } else {
         return new_piece;
     }
+}
 
 pub fn moveLeft(grid: Grid, piece: Piece) Piece {
     var new_piece = piece;
     new_piece.col -= 1;
-    for (new_piece.structure) |_, y| {
-        for (new_piece.structure[y]) |_, x| {
-            if (new_piece.structure[y][x] and
-                @intCast(i32, x) + new_piece.col < 0)
-            {
+    if (checkCollision(grid, new_piece)) {
         return piece;
-            }
-            if (new_piece.structure[y][x] and
-                !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free)
-            {
-                return piece;
-            }
-        }
-    }
+    } else {
         return new_piece;
     }
+}
 
 pub fn moveDown(grid: Grid, piece: Piece) Piece {
     var new_piece = piece;
     new_piece.row += 1;
-    for (new_piece.structure) |_, y| {
-        for (new_piece.structure[y]) |_, x| {
-            if (new_piece.structure[y][x] and
-                @intCast(i32, y) + new_piece.row > Grid.nrows - 1)
-            {
+    if (checkCollision(grid, new_piece)) {
         new_piece.row -= 1;
         new_piece.dropped = true;
         return new_piece;
-            }
-            if (new_piece.structure[y][x] and
-                !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free)
-            {
-                new_piece.row -= 1;
-                new_piece.dropped = true;
+    } else {
         return new_piece;
     }
 }
-    }
-    return new_piece;
-}
 
 pub fn drop(grid: Grid, piece: Piece) Grid {
     var new_grid = grid;
@@ -79,3 +47,14 @@ pub fn drop(grid: Grid, piece: Piece) Grid {
 
     return new_grid;
 }
+
+fn checkCollision(grid: Grid, piece: Piece) bool {
+    for (piece.structure) |_, y| {
+        for (piece.structure[y]) |_, x| {
+            if (piece.structure[y][x] and ((@intCast(i32, x) + piece.col > Grid.ncolumns - 1) or (@intCast(i32, x) + piece.col < 0) or (@intCast(i32, y) + piece.row > Grid.nrows - 1) or (!grid.cells[@intCast(usize, piece.row + @intCast(i32, y))][@intCast(usize, piece.col + @intCast(i32, x))].free))) {
+                return true;
+            }
+        }
+    }
+    return false;
+}

src/preview.zig

@@ -0,0 +1,12 @@
+const SDL = @import("sdl2");
+
+const Bag = @import("bag.zig");
+const Piece = @import("piece.zig");
+
+pub fn render(renderer: *SDL.SDL_Renderer, bag: Bag, cell_size: i32, pos_x: i32, pos_y: i32) void {
+    for (bag.contents[0..5]) |_, i| {
+        if (bag.contents[i]) |piece_type| {
+            Piece.init(piece_type).render(renderer, cell_size, pos_x, pos_y + @intCast(i32, i) * cell_size * 4);
+        }
+    }
+}

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