Search icon CANCEL
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Arrow up icon
GO TO TOP
Lua Game Development Cookbook

You're reading from   Lua Game Development Cookbook Over 70 recipes that will help you master the elements and best practices required to build a modern game engine using Lua

Arrow left icon
Product type Paperback
Published in Jul 2015
Publisher
ISBN-13 9781849515504
Length 360 pages
Edition 1st Edition
Languages
Tools
Arrow right icon
Author (1):
Arrow left icon
Mário Kašuba Mário Kašuba
Author Profile Icon Mário Kašuba
Mário Kašuba
Arrow right icon
View More author details
Toc

Table of Contents (11) Chapters Close

Preface 1. Basics of the Game Engine 2. Events FREE CHAPTER 3. Graphics – Common Methods 4. Graphics – Legacy Method with OpenGL 1.x–2.1 5. Graphics – Modern Method with OpenGL 3.0+ 6. The User Interface 7. Physics and Game Mechanics 8. Artificial Intelligence 9. Sounds and Networking Index

Writing a vertex shader


Vertex shaders are programs that operate on vertices and their attributes. This stage is also used to apply matrix transformations as well. GLSL shader programs use input and output variables. In the case of a vertex shader, input variables are either uniforms or vertex buffer data. Output variables are passed to the next stage of rendering the pipeline. There are also special built-in variables such as gl_Position, gl_PointSize, and others. These are mostly used with fixed functionality and may not be redeclared.

All shaders use the entry point function—main. This function is applied on each element—vertex.

Getting ready

This recipe will use the GLSL shading language with version 3.3. It assumes that all the vertices are stored in Vertex Buffer Object (VBO). The vertex shader program is applied on every vertex that is contained within VBO.

To prepare the vertex shader, you'll need to create the shader object first:

local shader_stage = gl_enum.GL_VERTEX_SHADER
local shader_object...
lock icon The rest of the chapter is locked
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at $19.99/month. Cancel anytime