Add textures image processing example

examples/README.md

@@ -99,4 +99,5 @@ Examples using raylib textures functionality, including image/textures loading/g
 | 49 | [textures_image_drawing](textures/textures_image_drawing.rb)               | <img src="textures/textures_image_drawing.png" alt="textures_image_drawing" width="80"> | ⭐️⭐️☆☆ | 1.4 | 1.4 | [Ray](https://github.com/raysan5) |
 | 50 | [textures_image_generation](textures/textures_image_generation.rb)         | <img src="textures/textures_image_generation.png" alt="textures_image_generation" width="80"> | ⭐️⭐️☆☆ | 1.8 | 1.8 | [Ray](https://github.com/raysan5) |
 | 51 | [textures_image_loading](textures/textures_image_loading.rb)               | <img src="textures/textures_image_loading.png" alt="textures_image_loading" width="80"> | ⭐️☆☆☆ | 1.3 | 1.3 | [Ray](https://github.com/raysan5) |
+| 52 | [textures_image_processing](textures/textures_image_processing.rb)         | <img src="textures/textures_image_processing.png" alt="textures_image_processing" width="80"> | ⭐️⭐️⭐️☆ | 1.4 | 3.5 | [Ray](https://github.com/raysan5) |
 | 58 | [textures_background_scrolling](textures/textures_background_scrolling.rb) | <img src="textures/textures_background_scrolling.png" alt="textures_background_scrolling" width="80"> | ⭐️☆☆☆ | 2.0 | 2.5 | [Ray](https://github.com/raysan5) |

examples/textures/textures_image_processing.rb

@@ -0,0 +1,137 @@
+# ******************************************************************************************
+# 
+#   raylib [textures] example - Image processing
+# 
+#   NOTE: Images are loaded in CPU memory (RAM); textures are loaded in GPU memory (VRAM)
+#
+#   Example originally created with raylib 1.4, last time updated with raylib 3.5
+# 
+#   Example ported to Ruby by Wilson Silva (@wilsonsilva). Works with Raylib 4.5
+#
+#   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) 2016-2023 Ramon Santamaria (@raysan5)
+#
+# ******************************************************************************************
+
+require 'bundler/setup'
+require 'raylib'
+
+NUM_PROCESSES = 9
+
+image_process = {
+  NONE: 0,
+  COLOR_GRAYSCALE: 1,
+  COLOR_TINT: 2,
+  COLOR_INVERT: 3,
+  COLOR_CONTRAST: 4,
+  COLOR_BRIGHTNESS: 5,
+  GAUSSIAN_BLUR: 6,
+  FLIP_VERTICAL: 7,
+  FLIP_HORIZONTAL: 8
+}
+
+process_text = [
+  'NO PROCESSING', 'COLOR GRAYSCALE', 'COLOR TINT', 'COLOR INVERT',
+  'COLOR CONTRAST', 'COLOR BRIGHTNESS', 'GAUSSIAN BLUR', 'FLIP VERTICAL',
+  'FLIP HORIZONTAL'
+]
+
+# Initialization
+# --------------------------------------------------------------------------------------
+SCREEN_WIDTH = 800
+SCREEN_HEIGHT = 450
+
+Raylib.init_window(SCREEN_WIDTH, SCREEN_HEIGHT, 'raylib [textures] example - image processing')
+
+im_origin = Raylib.load_image(File.join(__dir__, 'resources/parrots.png'))
+Raylib.image_format(im_origin, Raylib::PIXELFORMAT_UNCOMPRESSED_R8G8B8A8)
+texture = Raylib.load_texture_from_image(im_origin)
+
+im_copy = Raylib.image_copy(im_origin)
+
+current_process = image_process[:NONE]
+texture_reload = false
+
+toggle_recs = NUM_PROCESSES.times.map { |i| Raylib::Rectangle.create(40.0, 50 + 32*i, 150.0, 30.0) }
+
+Raylib.set_target_fps(60)
+# --------------------------------------------------------------------------------------
+
+# Main game loop
+until Raylib.window_should_close
+  # Update
+  # ----------------------------------------------------------------------------------
+  mouse_hover_rec = toggle_recs.find_index do |rec|
+    Raylib.check_collision_point_rec(Raylib.get_mouse_position, rec)
+  end || -1
+
+  if Raylib.is_mouse_button_released(Raylib::MOUSE_BUTTON_LEFT) && !mouse_hover_rec.negative?
+    current_process = mouse_hover_rec
+    texture_reload = true
+  end
+
+  if Raylib.is_key_pressed(Raylib::KEY_DOWN)
+    current_process = (current_process + 1) % NUM_PROCESSES
+    texture_reload = true
+  elsif Raylib.is_key_pressed(Raylib::KEY_UP)
+    current_process = (current_process - 1) % NUM_PROCESSES
+    texture_reload = true
+  end
+
+  if texture_reload
+    Raylib.unload_image(im_copy)
+    im_copy = Raylib.image_copy(im_origin)
+
+    case current_process
+    when image_process[:COLOR_GRAYSCALE] then Raylib.image_color_grayscale(im_copy)
+    when image_process[:COLOR_TINT] then Raylib.image_color_tint(im_copy, Raylib::GREEN)
+    when image_process[:COLOR_INVERT] then Raylib.image_color_invert(im_copy)
+    when image_process[:COLOR_CONTRAST] then Raylib.image_color_contrast(im_copy, -40)
+    when image_process[:COLOR_BRIGHTNESS] then Raylib.image_color_brightness(im_copy, -80)
+    when image_process[:GAUSSIAN_BLUR] then Raylib.image_blur_gaussian(im_copy, 10)
+    when image_process[:FLIP_VERTICAL] then Raylib.image_flip_vertical(im_copy)
+    when image_process[:FLIP_HORIZONTAL] then Raylib.image_flip_horizontal(im_copy)
+    end
+
+    pixels = Raylib.load_image_colors(im_copy)
+    Raylib.update_texture(texture, pixels)
+    Raylib.unload_image_colors(pixels)
+
+    texture_reload = false
+  end
+
+  # Draw
+  # ----------------------------------------------------------------------------------
+  Raylib.begin_drawing
+
+  Raylib.clear_background(Raylib::RAYWHITE)
+
+  Raylib.draw_text('IMAGE PROCESSING:', 40, 30, 10, Raylib::DARKGRAY)
+
+  toggle_recs.each_with_index do |rec, index|
+    color = (index == current_process || index == mouse_hover_rec) ? Raylib::SKYBLUE : Raylib::LIGHTGRAY
+    line_color = (index == current_process || index == mouse_hover_rec) ? Raylib::BLUE : Raylib::GRAY
+    text_color = (index == current_process || index == mouse_hover_rec) ? Raylib::DARKBLUE : Raylib::DARKGRAY
+
+    Raylib.draw_rectangle_rec(rec, color)
+    Raylib.draw_rectangle_lines_ex(rec, 1, line_color)
+    Raylib.draw_text(process_text[index], rec.x + rec.width/2 - Raylib.measure_text(process_text[index], 10)/2, rec.y + 11, 10, text_color)
+  end
+
+  Raylib.draw_texture(texture, SCREEN_WIDTH - texture.width - 60, SCREEN_HEIGHT/2 - texture.height/2, Raylib::WHITE)
+  Raylib.draw_rectangle_lines(SCREEN_WIDTH - texture.width - 60, SCREEN_HEIGHT/2 - texture.height/2, texture.width, texture.height, Raylib::BLACK)
+
+  Raylib.end_drawing
+  # ----------------------------------------------------------------------------------
+end
+
+# De-Initialization
+# --------------------------------------------------------------------------------------
+Raylib.unload_texture(texture) # Unload texture from VRAM
+Raylib.unload_image(im_origin) # Unload image-origin from RAM
+Raylib.unload_image(im_copy)   # Unload image-copy from RAM
+
+Raylib.close_window            # Close window and OpenGL context
+# --------------------------------------------------------------------------------------