Port raylib example to Odin

.github/workflows/check.yml

@@ -87,6 +87,7 @@ jobs:
           odin check raylib/ports/textures/textures_npatch_drawing.odin -file $FLAGS
           odin check raylib/ports/textures/textures_background_scrolling.odin -file $FLAGS
           odin check raylib/ports/textures/textures_blend_modes.odin -file $FLAGS
+          odin check raylib/ports/textures/textures_mouse_painting.odin -file $FLAGS
           odin check raylib/tetroid $FLAGS
           odin check raylib/box2d $FLAGS
           odin check raylib/ports/core/core_3d_camera_fps.odin -file $FLAGS

raylib/ports/textures/textures_mouse_painting.odin

@@ -0,0 +1,233 @@
+/*******************************************************************************************
+*
+*   raylib [textures] example - mouse painting
+*
+*   Example complexity rating: [★★★☆] 3/4
+*
+*   Example originally created with raylib 3.0, last time updated with raylib 6.0
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2019-2025 Chris Dill (@MysteriousSpace) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+package raylib_examples
+
+import "core:c"
+import rl "vendor:raylib"
+
+MAX_COLORS_COUNT :: 23          // Number of colors available
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+main :: proc() {
+	// Initialization
+	//--------------------------------------------------------------------------------------
+	SCREEN_WIDTH :: 800
+	SCREEN_HEIGHT :: 450
+
+	rl.InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "raylib [textures] example - mouse painting")
+
+	// Colors to choose from
+	colors := [MAX_COLORS_COUNT]rl.Color {
+		rl.RAYWHITE, rl.YELLOW, rl.GOLD, rl.ORANGE, rl.PINK, rl.RED, rl.MAROON, rl.GREEN, rl.LIME, rl.DARKGREEN,
+		rl.SKYBLUE, rl.BLUE, rl.DARKBLUE, rl.PURPLE, rl.VIOLET, rl.DARKPURPLE, rl.BEIGE, rl.BROWN, rl.DARKBROWN,
+		rl.LIGHTGRAY, rl.GRAY, rl.DARKGRAY, rl.BLACK }
+
+	// Define colors_recs data (for every rectangle)
+	colors_recs :[MAX_COLORS_COUNT]rl.Rectangle
+	for i := 0; i < MAX_COLORS_COUNT; i += 1 {
+		colors_recs[i].x = f32(10 + 30.0*i + 2*i)
+		colors_recs[i].y = 10
+		colors_recs[i].width = 30
+		colors_recs[i].height = 30
+	}
+
+	color_selected := 0
+	color_selected_prev : int  = color_selected
+	color_mouse_hover := 0
+	brush_size := f32(20.0)
+	mouse_was_pressed := false
+
+	btn_save_rec := rl.Rectangle{ 750, 10, 40, 30 }
+	btn_save_mouse_hover := false
+	show_save_message := false
+	save_message_counter := 0
+
+	// Create a RenderTexture2D to use as a canvas
+	target := rl.LoadRenderTexture(SCREEN_WIDTH, SCREEN_HEIGHT)
+
+	// Clear render texture before entering the game loop
+	rl.BeginTextureMode(target)
+	rl.ClearBackground(colors[0])
+	rl.EndTextureMode()
+
+	rl.SetTargetFPS(120)              // Set our game to run at 120 frames-per-second
+	//--------------------------------------------------------------------------------------
+
+	// Main game loop
+	for !rl.WindowShouldClose() {   // Detect window close button or ESC key
+		// Update
+		//----------------------------------------------------------------------------------
+		mouse_pos := rl.GetMousePosition()
+
+		// Move between colors with keys
+		if rl.IsKeyPressed(.RIGHT) {
+			color_selected += 1
+		} else if rl.IsKeyPressed(.LEFT) {
+			color_selected -= 1
+		}
+
+		if color_selected >= MAX_COLORS_COUNT {
+			color_selected = MAX_COLORS_COUNT - 1
+		} else if color_selected < 0 {
+			color_selected = 0	
+		} 
+
+		// Choose color with mouse
+		for i := 0; i < MAX_COLORS_COUNT; i += 1 {
+			if (rl.CheckCollisionPointRec(mouse_pos, colors_recs[i])) {
+				color_mouse_hover = i
+				break
+			} else {
+				color_mouse_hover = -1
+			}
+		}
+
+		if color_mouse_hover >= 0 && rl.IsMouseButtonPressed(.LEFT) {
+			color_selected = color_mouse_hover
+			color_selected_prev = color_selected
+		}
+
+		// Change brush size
+		brush_size += rl.GetMouseWheelMove()*5
+		if brush_size < 2 {
+			brush_size = 2
+		}
+		if brush_size > 50 {
+			brush_size = 50
+		}
+
+		if rl.IsKeyPressed(.C) {
+			// Clear render texture to clear color
+			rl.BeginTextureMode(target)
+			rl.ClearBackground(colors[0])
+			rl.EndTextureMode()
+		}
+
+		if rl.IsMouseButtonDown(.LEFT) || rl.IsGestureDetected(.DRAG) {
+			// Paint circle into render texture
+			// NOTE: To avoid discontinuous circles, we could store
+			// previous-next mouse points and just draw a line using brush size
+			rl.BeginTextureMode(target)
+			if mouse_pos.y > 50 {
+				rl.DrawCircle(c.int(mouse_pos.x), c.int(mouse_pos.y), brush_size, colors[color_selected])
+			}
+			rl.EndTextureMode()
+		}
+
+		if rl.IsMouseButtonDown(.RIGHT) {
+			if !mouse_was_pressed {
+				color_selected_prev = color_selected
+				color_selected = 0
+			}
+
+			mouse_was_pressed = true
+
+			// Erase circle from render texture
+			rl.BeginTextureMode(target)
+			if mouse_pos.y > 50 {
+				rl.DrawCircle(c.int(mouse_pos.x), c.int(mouse_pos.y), brush_size, colors[0])
+			}
+			rl.EndTextureMode()
+		} else if rl.IsMouseButtonReleased(.RIGHT) && mouse_was_pressed {
+			color_selected = color_selected_prev
+			mouse_was_pressed = false
+		}
+
+		// Check mouse hover save button
+		if rl.CheckCollisionPointRec(mouse_pos, btn_save_rec) {
+			btn_save_mouse_hover = true
+		} else {
+			btn_save_mouse_hover = false
+		}
+
+		// Image saving logic
+		// NOTE: Saving painted texture to a default named image
+		if (btn_save_mouse_hover && rl.IsMouseButtonReleased(.LEFT)) || rl.IsKeyPressed(.S) {
+			image := rl.LoadImageFromTexture(target.texture)
+			rl.ImageFlipVertical(&image)
+			rl.ExportImage(image, "my_amazing_texture_painting.png")
+			rl.UnloadImage(image)
+			show_save_message = true
+		}
+
+		if show_save_message {
+			// On saving, show a full screen message for 2 seconds
+			save_message_counter += 1
+			if (save_message_counter > 240) {
+				show_save_message = false
+				save_message_counter = 0
+			}
+		}
+		//----------------------------------------------------------------------------------
+
+		// Draw
+		//----------------------------------------------------------------------------------
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RAYWHITE)
+
+		// NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)
+		rl.DrawTextureRec(target.texture, rl.Rectangle{ 0, 0, f32(target.texture.width), f32(-target.texture.height) }, rl.Vector2 { 0, 0 }, rl.WHITE)
+
+		// Draw drawing circle for reference
+		if mouse_pos.y > 50 {
+			if rl.IsMouseButtonDown(.RIGHT) {
+				rl.DrawCircleLines(c.int(mouse_pos.x), c.int(mouse_pos.y), brush_size, rl.GRAY)
+			} else {
+				rl.DrawCircle(rl.GetMouseX(), rl.GetMouseY(), brush_size, colors[color_selected])
+			}
+		}
+
+		// Draw top panel
+		rl.DrawRectangle(0, 0, rl.GetScreenWidth(), 50, rl.RAYWHITE)
+		rl.DrawLine(0, 50, rl.GetScreenWidth(), 50, rl.LIGHTGRAY)
+
+		// Draw color selection rectangles
+		for i := 0; i < MAX_COLORS_COUNT; i += 1 {
+			rl.DrawRectangleRec(colors_recs[i], colors[i])
+		}
+		rl.DrawRectangleLines(10, 10, 30, 30, rl.LIGHTGRAY)
+
+		if color_mouse_hover >= 0 {
+			rl.DrawRectangleRec(colors_recs[color_mouse_hover], rl.Fade(rl.WHITE, 0.6))
+		}
+
+		rl.DrawRectangleLinesEx(rl.Rectangle{ colors_recs[color_selected].x - 2, colors_recs[color_selected].y - 2,
+							 colors_recs[color_selected].width + 4, colors_recs[color_selected].height + 4 }, 2, rl.BLACK)
+
+		// Draw save image button
+		rl.DrawRectangleLinesEx(btn_save_rec, 2, btn_save_mouse_hover ? rl.RED : rl.BLACK)
+		rl.DrawText("SAVE!", 755, 20, 10, btn_save_mouse_hover ? rl.RED : rl.BLACK)
+
+		// Draw save image message
+		if show_save_message {
+			rl.DrawRectangle(0, 0, rl.GetScreenWidth(), rl.GetScreenHeight(), rl.Fade(rl.RAYWHITE, 0.8))
+			rl.DrawRectangle(0, 150, rl.GetScreenWidth(), 80, rl.BLACK)
+			rl.DrawText("IMAGE SAVED!", 150, 180, 20, rl.RAYWHITE)
+		}
+
+		rl.EndDrawing()
+		//----------------------------------------------------------------------------------
+	}
+
+	// De-Initialization
+	//--------------------------------------------------------------------------------------
+	rl.UnloadRenderTexture(target)    // Unload render texture
+
+	rl.CloseWindow()                  // Close window and OpenGL context
+	//--------------------------------------------------------------------------------------
+}