Writing texturing vertex and fragment shaders

Texturing is a common technique that significantly improves the quality of rendered images. It allows us to load an image and wrap it around the object like a wallpaper. It increases the memory usage, but saves the performance which would be wasted on processing much more complex geometry.

How to do it...

1. Create a vertex shader in a text file called shader.vert (refer to the Writing vertex shaders recipe).
2. Apart from the vertex position, define an additional input variable (attribute) in the vertex shader through which texture coordinates are provided from the application:

      layout( location = 1 ) in vec2 app_tex_coordinates;

3. In the vertex shader, define an output (varying) variable through which texture coordinates will be passed from the vertex shader to a fragment shader:

      layout( location = 0 ) out vec2 vert_tex_coordinates;

4. In the vertex shader's void main() function, assign the app_tex_coordinates variable to the vert_tex_coordinates...