The second parameter to glm::perlin determines the period in x and y of the noise values. We use freq as the period because we are sampling the noise in the range from 0 to freq for each octave.
- Title Page
- Copyright and Credits
- Packt Upsell
- Contributors
- Preface
- Getting Started with GLSL
- Working with GLSL Programs
- Introduction
- Sending data to a shader using vertex attributes and vertex buffer objects
- Getting a list of active vertex input attributes and locations
- Sending data to a shader using uniform variables
- Getting a list of active uniform variables
- Using uniform blocks and uniform buffer objects
- Using program pipelines
- Getting debug messages
- Building a C++ shader program class
- The Basics of GLSL Shaders
- Lighting and Shading
- Using Textures
- Introduction
- Applying a 2D texture
- Applying multiple textures
- Using alpha maps to discard pixels
- Using normal maps
- Parallax mapping
- Steep parallax mapping with self shadowing
- Simulating reflection with cube maps
- Simulating refraction with cube maps
- Applying a projected texture
- Rendering to a texture
- Using sampler objects
- Diffuse image-based lighting
- Image Processing and Screen Space Techniques
- Introduction
- Applying an edge detection filter
- Applying a Gaussian blur filter
- Implementing HDR lighting with tone mapping
- Creating a bloom effect
- Using gamma correction to improve image quality
- Using multisample anti-aliasing
- Using deferred shading
- Screen space ambient occlusion
- Configuring the depth test
- Implementing order-independent transparency
- Using Geometry and Tessellation Shaders
- Shadows
- Using Noise in Shaders
- Particle Systems and Animation
- Using Compute Shaders
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