How to visualize a depth texture in OpenGL?

Question

I\'m working on a shadow mapping algorithm, and I\'d like to debug the depth map that it\'s generating on its first pass. However, depth textures don\'t seem to render properly

Answer 1

You may need to change the depth texture parameters to display it as greyscale levels :

glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_NONE )
glTexParameteri( GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_LUMINANCE )

You can then normally use the texture as a 'normal' greyscale 2d texture, either via fixed function, or a 'sampler2d' shader uniform.