raylib/ports/core/core_render_texture

Source

core_render_texture.odin ¶

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1/*******************************************************************************************
2*
3*   raylib [core] example - render texture
4*
5*   Example complexity rating: [★☆☆☆] 1/4
6*
7*   Example originally created with raylib 5.6-dev, last time updated with raylib 5.6-dev
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) 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 [core] example - render texture")
30	
31	// Define a render texture to render
32	render_texture_width: i32 = 300
33	render_texture_height: i32 = 300
34	target: rl.RenderTexture2D = rl.LoadRenderTexture(render_texture_width, render_texture_height)
35
36	ball_position := rl.Vector2 {f32(render_texture_width)/2, f32(render_texture_height)/2}
37	ball_speed := rl.Vector2 {5.0, 4.0}
38	ball_radius: i32 = 20
39
40	rotation: f32
41
42	rl.SetTargetFPS(60)               // Set our game to run at 60 frames-per-second
43	//----------------------------------------------------------
44
45	// Main game loop
46	for !rl.WindowShouldClose() {    // Detect window close button or ESC key
47		// Update
48		//-----------------------------------------------------
49		// Ball movement logic
50		ball_position.x += ball_speed.x
51		ball_position.y += ball_speed.y
52
53		// Check walls collision for bouncing
54		if ball_position.x >= f32(render_texture_width - ball_radius) || ball_position.x <= f32(ball_radius) {
55			ball_speed.x *= -1
56		}
57		if ball_position.y >= f32(render_texture_height - ball_radius) || ball_position.y <= f32(ball_radius) {
58			ball_speed.y *= -1
59		}
60
61		// Render texture rotation
62		rotation += 0.5
63		//-----------------------------------------------------
64
65		// Draw
66		//-----------------------------------------------------
67		// Draw our scene to the render texture
68		rl.BeginTextureMode(target)
69		
70			rl.ClearBackground(rl.SKYBLUE)
71			
72			rl.DrawCircleV(ball_position, f32(ball_radius), rl.MAROON)
73		
74		rl.EndTextureMode()
75		
76		// Draw render texture to main framebuffer
77		rl.BeginDrawing()
78
79			rl.ClearBackground(rl.RAYWHITE)
80
81			// Draw our render texture with rotation applied
82			// NOTE: We set the origin of the texture to the center of the render texture
83			texture_width := f32(target.texture.width)
84			texture_height := f32(target.texture.height)
85			rl.DrawTexturePro(target.texture, 
86				{0, 0, texture_width, -texture_height}, 
87				{SCREEN_WIDTH/2, SCREEN_HEIGHT/2, texture_width, -texture_height}, 
88				{texture_width/2, texture_height/2}, rotation, rl.WHITE)
89
90			rl.DrawText("DRAWING BOUNCING BALL INSIDE RENDER TEXTURE!", 10, SCREEN_HEIGHT - 40, 20, rl.BLACK)
91			
92
93			rl.DrawFPS(10, 10)
94
95		rl.EndDrawing()
96		//-----------------------------------------------------
97	}
98
99	// De-Initialization
100	//---------------------------------------------------------
101	rl.CloseWindow()        // Close window and OpenGL context
102	//----------------------------------------------------------
103}