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v/examples/tetris/tetris.v

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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module main
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import rand
import time
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import gx
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import gg
import glfw
import math
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import freetype
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const (
BlockSize = 20 // pixels
FieldHeight = 20 // # of blocks
FieldWidth = 10
TetroSize = 4
WinWidth = BlockSize * FieldWidth
WinHeight = BlockSize * FieldHeight
TimerPeriod = 250 // ms
TextSize = 12
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)
const (
text_cfg = gx.TextCfg{
align:gx.ALIGN_LEFT
size:TextSize
color:gx.rgb(0, 0, 0)
}
)
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const (
// Tetros' 4 possible states are encoded in binaries
BTetros = [
// 0000 0
// 0000 0
// 0110 6
// 0110 6
[66, 66, 66, 66],
// 0000 0
// 0000 0
// 0010 2
// 0111 7
[27, 131, 72, 232],
// 0000 0
// 0000 0
// 0011 3
// 0110 6
[36, 231, 36, 231],
// 0000 0
// 0000 0
// 0110 6
// 0011 3
[63, 132, 63, 132],
// 0000 0
// 0011 3
// 0001 1
// 0001 1
[311, 17, 223, 74],
// 0000 0
// 0011 3
// 0010 2
// 0010 2
[322, 71, 113, 47],
// Special case since 15 can't be used
// 1111
[1111, 9, 1111, 9],
]
// Each tetro has its unique color
Colors = [
gx.rgb(0, 0, 0), // unused ?
gx.rgb(253, 32, 47), // lightred quad
gx.rgb(0, 110, 194), // lightblue triple
gx.rgb(170, 170, 0), // darkyellow short topright
gx.rgb(170, 0, 170), // purple short topleft
gx.rgb(50, 90, 110), // darkgrey long topleft
gx.rgb(0, 170, 0), // lightgreen long topright
gx.rgb(170, 85, 0), // brown longest
gx.rgb(0, 170, 170), // unused ?
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]
)
// TODO: type Tetro [TetroSize]struct{ x, y int }
struct Block {
mut:
x int
y int
}
enum GameState {
paused running gameover
}
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struct Game {
mut:
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// Score of the current game
score int
// State of the current game
state GameState
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// Position of the current tetro
pos_x int
pos_y int
// field[y][x] contains the color of the block with (x,y) coordinates
// "-1" border is to avoid bounds checking.
// -1 -1 -1 -1
// -1 0 0 -1
// -1 0 0 -1
// -1 -1 -1 -1
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field [][]int
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// TODO: tetro Tetro
tetro []Block
// TODO: tetros_cache []Tetro
tetros_cache []Block
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// Index of the current tetro. Refers to its color.
tetro_idx int
// Index of the rotation (0-3)
rotation_idx int
// gg context for drawing
gg &gg.GG
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// ft context for font drawing
ft &freetype.Context
font_loaded bool
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}
fn main() {
glfw.init()
mut game := &Game{
gg: gg.new_context(gg.Cfg {
width: WinWidth
height: WinHeight
use_ortho: true // This is needed for 2D drawing
create_window: true
window_title: 'V Tetris'
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window_user_ptr: game
})
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ft: 0
}
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game.gg.window.set_user_ptr(game) // TODO remove this when `window_user_ptr:` works
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game.init_game()
game.gg.window.onkeydown(key_down)
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go game.run() // Run the game loop in a new thread
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gg.clear(gx.White)
// Try to load font
game.ft = freetype.new_context(gg.Cfg{
width: WinWidth
height: WinHeight
use_ortho: true
font_size: 18
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scale: 2
})
game.font_loaded = (game.ft != 0 )
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for {
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gg.clear(gx.White)
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game.draw_scene()
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game.gg.render()
if game.gg.window.should_close() {
game.gg.window.destroy()
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return
}
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}
}
fn (g mut Game) init_game() {
g.parse_tetros()
rand.seed(time.now().uni)
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g.generate_tetro()
g.field = []array_int // TODO: g.field = [][]int
// Generate the field, fill it with 0's, add -1's on each edge
for i := 0; i < FieldHeight + 2; i++ {
mut row := [0].repeat(FieldWidth + 2)
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row[0] = - 1
row[FieldWidth + 1] = - 1
g.field << row
}
mut first_row := g.field[0]
mut last_row := g.field[FieldHeight + 1]
for j := 0; j < FieldWidth + 2; j++ {
first_row[j] = - 1
last_row[j] = - 1
}
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g.score = 0
g.state = .running
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}
fn (g mut Game) parse_tetros() {
for b_tetros in BTetros {
for b_tetro in b_tetros {
for t in parse_binary_tetro(b_tetro) {
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g.tetros_cache << t
}
}
}
}
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fn (g mut Game) run() {
for {
if g.state == .running {
g.move_tetro()
g.delete_completed_lines()
}
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glfw.post_empty_event() // force window redraw
time.sleep_ms(TimerPeriod)
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}
}
fn (g mut Game) move_tetro() {
// Check each block in current tetro
for block in g.tetro {
y := block.y + g.pos_y + 1
x := block.x + g.pos_x
// Reached the bottom of the screen or another block?
// TODO: if g.field[y][x] != 0
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//if g.field[y][x] != 0 {
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row := g.field[y]
if row[x] != 0 {
// The new tetro has no space to drop => end of the game
if g.pos_y < 2 {
g.state = .gameover
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return
}
// Drop it and generate a new one
g.drop_tetro()
g.generate_tetro()
return
}
}
g.pos_y++
}
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fn (g mut Game) move_right(dx int) bool {
// Reached left/right edge or another tetro?
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for i := 0; i < TetroSize; i++ {
tetro := g.tetro[i]
y := tetro.y + g.pos_y
x := tetro.x + g.pos_x + dx
row := g.field[y]
if row[x] != 0 {
// Do not move
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return false
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}
}
g.pos_x += dx
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return true
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}
fn (g mut Game) delete_completed_lines() {
for y := FieldHeight; y >= 1; y-- {
g.delete_completed_line(y)
}
}
fn (g mut Game) delete_completed_line(y int) {
for x := 1; x <= FieldWidth; x++ {
f := g.field[y]
if f[x] == 0 {
return
}
}
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g.score += 10
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// Move everything down by 1 position
for yy := y - 1; yy >= 1; yy-- {
for x := 1; x <= FieldWidth; x++ {
mut a := g.field[yy + 1]
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b := g.field[yy]
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a[x] = b[x]
}
}
}
// Place a new tetro on top
fn (g mut Game) generate_tetro() {
g.pos_y = 0
g.pos_x = FieldWidth / 2 - TetroSize / 2
g.tetro_idx = rand.next(BTetros.len)
g.rotation_idx = 0
g.get_tetro()
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}
// Get the right tetro from cache
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fn (g mut Game) get_tetro() {
idx := g.tetro_idx * TetroSize * TetroSize + g.rotation_idx * TetroSize
g.tetro = g.tetros_cache.slice(idx, idx + TetroSize)
}
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// TODO mut
fn (g &Game) drop_tetro() {
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for i := 0; i < TetroSize; i++ {
tetro := g.tetro[i]
x := tetro.x + g.pos_x
y := tetro.y + g.pos_y
// Remember the color of each block
// TODO: g.field[y][x] = g.tetro_idx + 1
mut row := g.field[y]
row[x] = g.tetro_idx + 1
}
}
fn (g &Game) draw_tetro() {
for i := 0; i < TetroSize; i++ {
tetro := g.tetro[i]
g.draw_block(g.pos_y + tetro.y, g.pos_x + tetro.x, g.tetro_idx + 1)
}
}
fn (g &Game) draw_block(i, j, color_idx int) {
g.gg.draw_rect((j - 1) * BlockSize, (i - 1) * BlockSize,
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BlockSize - 1, BlockSize - 1, Colors[color_idx])
}
fn (g &Game) draw_field() {
for i := 1; i < FieldHeight + 1; i++ {
for j := 1; j < FieldWidth + 1; j++ {
f := g.field[i]
if f[j] > 0 {
g.draw_block(i, j, f[j])
}
}
}
}
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fn (g mut Game) draw_score() {
if g.font_loaded {
g.ft.draw_text(1, 2, 'score: ' + g.score.str(), text_cfg)
if g.state == .gameover {
g.ft.draw_text(1, WinHeight / 2 + 0 * TextSize, 'Game Over', text_cfg)
g.ft.draw_text(1, WinHeight / 2 + 2 * TextSize, 'SPACE to restart', text_cfg)
} else if g.state == .paused {
g.ft.draw_text(1, WinHeight / 2 + 0 * TextSize, 'Game Paused', text_cfg)
g.ft.draw_text(1, WinHeight / 2 + 2 * TextSize, 'SPACE to resume', text_cfg)
}
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}
}
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fn (g mut Game) draw_scene() {
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g.draw_tetro()
g.draw_field()
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g.draw_score()
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}
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fn parse_binary_tetro(t_ int) []Block {
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mut t := t_
res := [Block{}].repeat(4)
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mut cnt := 0
horizontal := t == 9// special case for the horizontal line
for i := 0; i <= 3; i++ {
// Get ith digit of t
p := int(math.pow(10, 3 - i))
mut digit := int(t / p)
t %= p
// Convert the digit to binary
for j := 3; j >= 0; j-- {
bin := digit % 2
digit /= 2
if bin == 1 || (horizontal && i == TetroSize - 1) {
// TODO: res[cnt].x = j
// res[cnt].y = i
mut point := &res[cnt]
point.x = j
point.y = i
cnt++
}
}
}
return res
}
// TODO: this exposes the unsafe C interface, clean up
fn key_down(wnd voidptr, key, code, action, mods int) {
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if action != 2 && action != 1 {
return
}
// Fetch the game object stored in the user pointer
mut game := &Game(glfw.get_window_user_pointer(wnd))
// global keys
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switch key {
case glfw.KEY_ESCAPE:
glfw.set_should_close(wnd, true)
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case glfw.key_space:
if game.state == .running {
game.state = .paused
} else if game.state == .paused {
game.state = .running
} else if game.state == .gameover {
game.init_game()
game.state = .running
}
}
if game.state != .running {
return
}
// keys while game is running
switch key {
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case glfw.KeyUp:
// Rotate the tetro
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old_rotation_idx := game.rotation_idx
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game.rotation_idx++
if game.rotation_idx == TetroSize {
game.rotation_idx = 0
}
game.get_tetro()
if !game.move_right(0) {
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game.rotation_idx = old_rotation_idx
game.get_tetro()
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}
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if game.pos_x < 0 {
game.pos_x = 1
}
case glfw.KeyLeft:
game.move_right(-1)
case glfw.KeyRight:
game.move_right(1)
case glfw.KeyDown:
game.move_tetro() // drop faster when the player presses <down>
}
}