Add key shortcut to descend when flying

README.md

@@ -97,7 +97,7 @@ the client.
 - Ctrl + Right Click to toggle a block as a light source.
 - 1-9 to select the block type to create.
 - E to cycle through the block types.
-- Tab to toggle between walking and flying.
+- Tab to toggle between walking and flying (when flying, space to ascend, right-shift to descend).
 - ZXCVBN to move in exact directions along the XYZ axes.
 - Left shift to zoom.
 - F to show the scene in orthographic mode.

src/config.h

@@ -32,6 +32,7 @@
 #define CRAFT_KEY_LEFT 'A'
 #define CRAFT_KEY_RIGHT 'D'
 #define CRAFT_KEY_JUMP GLFW_KEY_SPACE
+#define CRAFT_KEY_CROUCH GLFW_KEY_RIGHT_SHIFT
 #define CRAFT_KEY_FLY GLFW_KEY_TAB
 #define CRAFT_KEY_OBSERVE 'O'
 #define CRAFT_KEY_OBSERVE_INSET 'P'

src/main.c

@@ -2437,6 +2437,11 @@ void handle_movement(double dt) {
                 dy = 8;
             }
         }
+        if (glfwGetKey(g->window, CRAFT_KEY_CROUCH)) {
+            if (g->flying) {
+                vy = -1;
+            }
+        }
     }
     float speed = g->flying ? 20 : 5;
     int estimate = roundf(sqrtf(