# /*******************************************************************************************
# *
# *   raylib [models] example - Heightmap loading and drawing
# *
# *   This example has been created using raylib 1.8 (www.raylib.com)
# *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
# *
# *   Copyright (c) 2015 Ramon Santamaria (@raysan5)
# *
# ********************************************************************************************/

from raylib import *

# Initialization
#--------------------------------------------------------------------------------------
screenWidth = 800
screenHeight = 450

InitWindow(screenWidth, screenHeight, b"raylib [models] example - heightmap loading and drawing")

# Define our custom camera to look into our 3d world
camera = ffi.new("struct Camera3D *",  [[ 18.0, 16.0, 18.0 ], [ 0.0, 0.0, 0.0 ], [ 0.0, 1.0, 0.0 ], 45.0, 0 ])

image = LoadImage(b"resources/heightmap.png")             # Load heightmap image (RAM)
texture = LoadTextureFromImage(image)                # Convert image to texture (VRAM)

mesh = GenMeshHeightmap(image, ( 16, 8, 16 ))    # Generate heightmap mesh (RAM and VRAM)
model = LoadModelFromMesh(mesh)                         # Load model from generated mesh

model.materials[0].maps[MAP_DIFFUSE].texture = texture        # Set map diffuse texture
mapPosition = ( -8.0, 0.0, -8.0 )                # Define model position

UnloadImage(image)                     # Unload heightmap image from RAM, already uploaded to VRAM

SetCameraMode(camera[0], CAMERA_ORBITAL)  # Set an orbital camera mode

SetTargetFPS(60)                       # Set our game to run at 60 frames-per-second
#--------------------------------------------------------------------------------------

# Main game loop
while not WindowShouldClose():            # Detect window close button or ESC key
    # Update
    #----------------------------------------------------------------------------------
    UpdateCamera(camera)              # Update camera
    #----------------------------------------------------------------------------------

    # Draw
    #----------------------------------------------------------------------------------
    BeginDrawing()

    ClearBackground(RAYWHITE)

    BeginMode3D(camera[0])

    DrawModel(model, mapPosition, 1.0, RED)

    DrawGrid(20, 1.0)

    EndMode3D()

    DrawTexture(texture, screenWidth - texture.width - 20, 20, WHITE)
    DrawRectangleLines(screenWidth - texture.width - 20, 20, texture.width, texture.height, GREEN)

    DrawFPS(10, 10)

    EndDrawing()
    #----------------------------------------------------------------------------------


# De-Initialization
#--------------------------------------------------------------------------------------
UnloadTexture(texture)     # Unload texture
UnloadModel(model)         # Unload model

CloseWindow()              # Close window and OpenGL context
#--------------------------------------------------------------------------------------