Add fog example

examples/shaders/fog.py

@@ -0,0 +1,94 @@
+"""
+Example converted to Python from:
+http://bedroomcoders.co.uk/raylib-fog/
+"""
+
+from raylib.dynamic import raylib as rl, ffi
+from raylib.colors import *
+
+rl.SetConfigFlags(rl.FLAG_MSAA_4X_HINT | rl.FLAG_WINDOW_RESIZABLE)
+rl.InitWindow(1280, 768, b'Fog Test')
+
+camera = ffi.new('struct Camera3D *', [
+	[2, 2, 6],
+	[0, 5, 0],
+	[0, 1, 0],
+	45,
+	rl.CAMERA_PERSPECTIVE
+])
+
+model = rl.LoadModelFromMesh(rl.GenMeshTorus(0.4, 1, 16, 32))
+model2 = rl.LoadModelFromMesh(rl.GenMeshCube(1, 1, 1))
+model3 = rl.LoadModelFromMesh(rl.GenMeshSphere(0.5, 32, 32))
+
+texture = rl.LoadTexture(b'resources/test.png')
+
+model.materials[0].maps[rl.MAP_DIFFUSE].texture = texture
+model2.materials[0].maps[rl.MAP_DIFFUSE].texture = texture
+model3.materials[0].maps[rl.MAP_DIFFUSE].texture = texture
+
+shader = rl.LoadShader(b'resources/shaders/fogLight.vs', b'resources/shaders/fogLight.fs')
+shader.locs[rl.LOC_MATRIX_MODEL] = rl.GetShaderLocation(shader, b'matModel')
+shader.locs[rl.LOC_VECTOR_VIEW] = rl.GetShaderLocation(shader, b'viewPos')
+
+amb = rl.GetShaderLocation(shader, b'ambient')
+rl.SetShaderValue(shader, amb, ffi.new('float[]', [0.2, 0.2, 0.2, 1.0]), rl.UNIFORM_VEC4)
+
+fog_color = [0.2, 0.2, 1.0, 1.0]
+fogC = rl.GetShaderLocation(shader, b'fogColor')
+rl.SetShaderValue(shader, fogC, ffi.new('float[]', fog_color), rl.UNIFORM_VEC4)
+
+fogD = rl.GetShaderLocation(shader, b'FogDensity')
+fogDensity = 0.12
+rl.SetShaderValue(shader, fogD, ffi.new('float[]', [fogDensity]), rl.UNIFORM_FLOAT)
+
+
+model.materials[0].shader = shader
+model2.materials[0].shader = shader
+model3.materials[0].shader = shader
+
+rl.SetCameraMode(camera[0], rl.CAMERA_ORBITAL)
+rl.SetTargetFPS(60)
+
+while not rl.WindowShouldClose():
+	rl.UpdateCamera(camera)
+
+	if rl.IsKeyDown(rl.KEY_UP):
+		fogDensity = min(fogDensity + 0.001, 1)
+
+	if rl.IsKeyDown(rl.KEY_DOWN):
+		fogDensity = max(fogDensity - 0.001, 0)
+
+	rl.SetShaderValue(shader, fogD, ffi.new('float[]', [fogDensity]), rl.UNIFORM_FLOAT)
+
+	rl.SetShaderValue(shader, shader.locs[rl.LOC_VECTOR_VIEW], ffi.new('float[]', [camera.position.x]), rl.UNIFORM_VEC3)
+
+	rl.BeginDrawing()
+
+	rl.ClearBackground([int(255 * i) for i in fog_color])
+
+	rl.BeginMode3D(camera[0])
+	rl.DrawModel(model, [0] * 3, 1, WHITE)
+	rl.DrawModel(model2, [-2.6, 0, 0], 1, WHITE)
+	rl.DrawModel(model3, [ 2.6, 0, 0], 1, WHITE)
+
+	for i in range(-20, 20, 2):
+		rl.DrawModel(model, [i, 0, 2], 1, WHITE)
+
+
+	rl.DrawGizmo([1000, 1000, 1000])
+
+	rl.EndMode3D()
+
+	rl.DrawFPS(10, 10)
+	rl.DrawText(f'Up/Down to change fog density: {fogDensity}'.encode('utf-8'), 10, 30, 20, WHITE)
+
+	rl.EndDrawing()
+
+
+rl.CloseWindow()
+rl.UnloadModel(model)
+rl.UnloadModel(model2)
+rl.UnloadModel(model3)
+rl.UnloadTexture(texture)
+rl.UnloadShader(shader)