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Using Multiple Light Sources

Code Name: MultipleLightSources

Description

In this example, objects of different colors are drawn on the scene, and lighting is provided by multiple lights which can be directional light, point light or spotlight (soft-cutoff). Light count provided to the shaders with a specialization constant.

Output

Controls

Input Action
W/A/S/D Move the camera
Mouse Look around with the camera
Esc Close the window

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.LightColor glm:vec3 AppSettings::LightColor Color of the light (RGB)
AppSettings.AmbientStrength float AppSettings::AmbientStrength Ambient strength of the material
AppSettings.SpecularStrength float AppSettings::SpecularStrength Specular strength factor
AppSettings.Shininess float AppSettings::Shininess Shininess exponent
AppSettings.InnerCutoffAngle float AppSettings::InnerCutoffAngle Inner cutoff angle of the spotlight
AppSettings.OuterCutoffAngle float AppSettings::OuterCutoffAngle Outer cutoff angle of the spotlight
AppSettings.ConstantFactor float AppSettings::ConstantFactor Constant factor in the attenuation formula
AppSettings.LinearFactor float AppSettings::LinearFactor Linear factor in the attenuation formula
AppSettings.QuadraticFactor float AppSettings::QuadraticFactor Quadratic factor in the attenuation formula

Learning Objectives

  • Implementing various and numerous light sources behavior in the shaders
  • Sending multiple light data and count via storage buffers and specialization constants

Shader Status

Shader Type Status Notes
GLSL ✅
HLSL ✅
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