ExponentialVarianceShadow

Exponential Variance Shadow Mapping (EVSM)

Code Name: ExponentialVarianceShadow

Description

In this example, the shadows in the scene are created using Exponential Variance Shadow Mapping (EVSM) with using box filtering that can be adjusted from user.

Output

Controls

Input	Action
W/A/S/D	Move the camera
Mouse	Look around with the camera
Esc	Close the window
0	Apply no filter
1	Apply 3x3 filter
2	Apply 5x5 filter
3	Apply 7x7 filter
4	Apply 9x9 filter

Application Parameters

Settings

Parameter / Key	Type	Usage in Code	Description	Default Value
AppSettings.ClearColor	VkClearColorValue	AppSettings::ClearColor	Background color of the screen
AppSettings.MouseSensitivity	float	AppSettings::MouseSensitivity	Mouse sensitivity value
AppSettings.CameraSpeed	float	AppSettings::CameraSpeed	Speed of the camera
AppSettings.EsmExponent	float	AppSettings::EsmExponent	ESM coefficient

Learning Objectives

• Implementing Exponential Variance Shadow Mapping (EVSM) technique in Vulkan
• Applying box filtering kernel to Exponential Variance Shadow Mapping (EVSM)

Shader Status

Shader Type	Status	Notes
GLSL	✅
HLSL	❌	Will be implemented.
Slang	❌	Will be implemented.

Theoretical Background

None

Extensions Used

Instance

Window system-dependent extensions:

• VK_KHR_surface
• VK_KHR_win32_surface (Windows)

Device

• VK_KHR_swapchain