OpenGL 4 Shading Language Cookbook - Third Edition

How to do it...

To use the GLM libraries, include the core header file, and headers for any extensions. For this example, we'll include the matrix transform extension:

#include <glm/glm.hpp> 
#include <glm/gtc/matrix_transform.hpp> 

The GLM classes are available in the glm namespace. The following is an example of how you might go about making use of some of them:

glm::vec4 position = glm::vec4( 1.0f, 0.0f, 0.0f, 1.0f ); 
glm::mat4 view = glm::lookAt(         glm::vec3(0.0f, 0.0f, 5.0f),        glm::vec3(0.0f, 0.0f, 0.0f),        glm::vec3(0.0f, 1.0f, 0.0f)    ); 
glm::mat4 model(1.0f);   // The identity matrix 
model = glm::rotate( model, 90.0f, glm::vec3(0.0f,1.0f,0.0) ); 
glm::mat4 mv = view * model; 
glm::vec4 transformed = mv * position;