raylib/ports/textures/textures_background_scrolling

Source

textures_background_scrolling.odin ¶

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1/*******************************************************************************************
2*
3*   raylib [textures] example - background scrolling
4*
5*   Example complexity rating: [★☆☆☆] 1/4
6*
7*   Example originally created with raylib 2.0, last time updated with raylib 2.5
8*
9*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
10*   BSD-like license that allows static linking with closed source software
11*
12*   Copyright (c) 2019-2025 Ramon Santamaria (@raysan5)
13*
14********************************************************************************************/
15
16package raylib_examples
17
18import rl "vendor:raylib"
19
20//------------------------------------------------------------------------------------
21// Program main entry point
22//------------------------------------------------------------------------------------
23main :: proc() {
24	// Initialization
25	//--------------------------------------------------------------------------------------
26	SCREEN_WIDTH :: 800
27	SCREEN_HEIGHT :: 450
28
29	rl.InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "raylib [textures] example - background scrolling")
30
31	// NOTE: Be careful, background width must be equal or bigger than screen width
32	// if not, texture should be draw more than two times for scrolling effect
33	background := rl.LoadTexture("resources/cyberpunk_street_background.png")
34	midground := rl.LoadTexture("resources/cyberpunk_street_midground.png")
35	foreground := rl.LoadTexture("resources/cyberpunk_street_foreground.png")
36
37	scrolling_back: f32
38	scrolling_mid: f32
39	scrolling_fore: f32
40
41	rl.SetTargetFPS(60)               // Set our game to run at 60 frames-per-second
42	//--------------------------------------------------------------------------------------
43
44	// Main game loop
45	for !rl.WindowShouldClose() {    // Detect window close button or ESC key
46		// Update
47		//----------------------------------------------------------------------------------
48		scrolling_back -= 0.1
49		scrolling_mid -= 0.5
50		scrolling_fore -= 1
51
52		// NOTE: Texture is scaled twice its size, so it sould be considered on scrolling
53		if scrolling_back <= f32(-background.width*2) {
54			scrolling_back = 0
55		}
56		if scrolling_mid <= f32(-midground.width*2) {
57			scrolling_mid = 0
58		}
59		if scrolling_fore <= f32(-foreground.width*2) {
60			scrolling_fore = 0
61		}
62		//----------------------------------------------------------------------------------
63
64		// Draw
65		//----------------------------------------------------------------------------------
66		rl.BeginDrawing()
67
68			rl.ClearBackground(rl.GetColor(0x052c46ff))
69
70			// Draw background image twice
71			// NOTE: Texture is scaled twice its size
72			rl.DrawTextureEx(background, {scrolling_back, 20}, 0, 2, rl.WHITE)
73			rl.DrawTextureEx(background, {f32(background.width*2) + scrolling_back, 20}, 0, 2, rl.WHITE)
74
75			// Draw midground image twice
76			rl.DrawTextureEx(midground, {scrolling_mid, 20}, 0, 2, rl.WHITE)
77			rl.DrawTextureEx(midground, {f32(midground.width*2) + scrolling_mid, 20}, 0, 2, rl.WHITE)
78
79			// Draw foreground image twice
80			rl.DrawTextureEx(foreground, {scrolling_fore, 70}, 0, 2, rl.WHITE)
81			rl.DrawTextureEx(foreground, {f32(foreground.width*2) + scrolling_fore, 70}, 0, 2, rl.WHITE)
82
83			rl.DrawText("BACKGROUND SCROLLING & PARALLAX", 10, 10, 20, rl.RED)
84			rl.DrawText("(c) Cyberpunk Street Environment by Luis Zuno (@ansimuz)", SCREEN_WIDTH - 330, SCREEN_HEIGHT - 20, 10, rl.RAYWHITE)
85
86		rl.EndDrawing()
87		//----------------------------------------------------------------------------------
88	}
89
90	// De-Initialization
91	//--------------------------------------------------------------------------------------
92	rl.UnloadTexture(background)  // Unload background texture
93	rl.UnloadTexture(midground)   // Unload midground texture
94	rl.UnloadTexture(foreground)  // Unload foreground texture
95	rl.CloseWindow()              // Close window and OpenGL context
96	//--------------------------------------------------------------------------------------
97}