Add textures image generation example

examples/README.md

@@ -97,4 +97,5 @@ Examples using raylib textures functionality, including image/textures loading/g
 | 47 | [textures_logo_raylib](textures/textures_logo_raylib.rb)                   | <img src="textures/textures_logo_raylib.png" alt="textures_logo_raylib" width="80"> | ⭐️☆☆☆ | 1.0 | 1.0 | [Ray](https://github.com/raysan5) |
 | 48 | [textures_srcrec_dstrec](textures/textures_srcrec_dstrec.rb)               | <img src="textures/textures_srcrec_dstrec.png" alt="textures_srcrec_dstrec" width="80"> | ⭐️⭐️⭐️☆ | 1.3 | 1.3 | [Ray](https://github.com/raysan5) |
 | 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) |
 | 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_generation.rb

@@ -0,0 +1,92 @@
+# ******************************************************************************************
+#
+#   raylib [textures] example - Procedural images generation
+#
+#   Example originally created with raylib 1.8, last time updated with raylib 1.8
+#
+#   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) 2017-2023 Wilhem Barbier (@nounoursheureux) and Ramon Santamaria (@raysan5)
+#
+# ******************************************************************************************
+
+require 'bundler/setup'
+require 'raylib'
+
+# Initialization
+# --------------------------------------------------------------------------------------
+SCREEN_WIDTH = 800
+SCREEN_HEIGHT = 450
+
+Raylib.init_window(SCREEN_WIDTH, SCREEN_HEIGHT, 'raylib [textures] example - procedural images generation')
+
+NUM_TEXTURES = 6 # Currently we have 7 generation algorithms
+
+vertical_gradient   = Raylib.gen_image_gradient_v(SCREEN_WIDTH, SCREEN_HEIGHT, Raylib::RED, Raylib::BLUE)
+horizontal_gradient = Raylib.gen_image_gradient_h(SCREEN_WIDTH, SCREEN_HEIGHT, Raylib::RED, Raylib::BLUE)
+radial_gradient     = Raylib.gen_image_gradient_radial(SCREEN_WIDTH, SCREEN_HEIGHT, 0.0, Raylib::WHITE, Raylib::BLACK)
+checked             = Raylib.gen_image_checked(SCREEN_WIDTH, SCREEN_HEIGHT, 32, 32, Raylib::RED, Raylib::BLUE)
+white_noise         = Raylib.gen_image_white_noise(SCREEN_WIDTH, SCREEN_HEIGHT, 0.5)
+cellular            = Raylib.gen_image_cellular(SCREEN_WIDTH, SCREEN_HEIGHT, 32)
+
+textures = [
+  Raylib.load_texture_from_image(vertical_gradient),
+  Raylib.load_texture_from_image(horizontal_gradient),
+  Raylib.load_texture_from_image(radial_gradient),
+  Raylib.load_texture_from_image(checked),
+  Raylib.load_texture_from_image(white_noise),
+  Raylib.load_texture_from_image(cellular)
+]
+
+# Unload image data (CPU RAM)
+[vertical_gradient, horizontal_gradient, radial_gradient, checked, white_noise, cellular].each do |image|
+  Raylib.unload_image(image)
+end
+
+current_texture = 0
+
+Raylib.set_target_fps(60)
+# --------------------------------------------------------------------------------------
+
+# Main game loop
+until Raylib.window_should_close
+  # Update
+  # ----------------------------------------------------------------------------------
+  if Raylib.is_mouse_button_pressed(Raylib::MOUSE_BUTTON_LEFT) || Raylib.is_key_pressed(Raylib::KEY_RIGHT)
+    current_texture = (current_texture + 1) % NUM_TEXTURES # Cycle between the textures
+  end
+  # ----------------------------------------------------------------------------------
+
+  # Draw
+  # ----------------------------------------------------------------------------------
+  Raylib.begin_drawing
+  Raylib.clear_background(Raylib::RAYWHITE)
+  Raylib.draw_texture(textures[current_texture], 0, 0, Raylib::WHITE)
+  Raylib.draw_rectangle(30, 400, 325, 30, Raylib.fade(Raylib::SKYBLUE, 0.5))
+  Raylib.draw_rectangle_lines(30, 400, 325, 30, Raylib.fade(Raylib::WHITE, 0.5))
+  Raylib.draw_text('MOUSE LEFT BUTTON to CYCLE PROCEDURAL TEXTURES', 40, 410, 10, Raylib::WHITE)
+
+  case current_texture
+  when 0; Raylib.draw_text('VERTICAL GRADIENT', 560, 10, 20, Raylib::RAYWHITE)
+  when 1; Raylib.draw_text('HORIZONTAL GRADIENT', 540, 10, 20, Raylib::RAYWHITE)
+  when 2; Raylib.draw_text('RADIAL GRADIENT', 580, 10, 20, Raylib::LIGHTGRAY)
+  when 3; Raylib.draw_text('CHECKED', 680, 10, 20, Raylib::RAYWHITE)
+  when 4; Raylib.draw_text('WHITE NOISE', 640, 10, 20, Raylib::RED)
+  when 5; Raylib.draw_text('CELLULAR', 670, 10, 20, Raylib::RAYWHITE)
+  end
+
+  Raylib.end_drawing
+  # ----------------------------------------------------------------------------------
+end
+
+# De-Initialization
+# --------------------------------------------------------------------------------------
+
+# Unload textures data (GPU VRAM)
+textures.each { |texture| Raylib.unload_texture(texture) }
+
+Raylib.close_window # Close window and OpenGL context
+# --------------------------------------------------------------------------------------