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There are some areas seem to be overexposure comparing to C++ implementation.
May be some rendering setting are wrong.

Since glium does not provide interface to set wrap function for texture sampler equivalent to GL_CLAMP_TO_BORDER, this example renders an incorrect image.

The shadow-map is basically implemented.
However some issues still haven't been dealt with:

• the frustum in the rendering scene look at upper direction(it does not face to the object)
• we still can't see the shadow.
• polygon offset is not support, since this is the missing feature in glium.

The rendering effect of Chapter05 Normal-Map example is not the same with C++ version.
It seems like the normal map is applied to the incorrect texture coordinate.

The rendered image is not identical to the C++ implementation.
Keep this issue open to track this problem.

Chapter11 introduce the usage of compute shader.
As said in glium/glium#1790, examples can't be implemented right now.

glium does not suppot read format UncompressedFloatFormat::F32F32F32F32 from texture2d.
Related issue: glium/glium#1502.

When this project started on, the version of glium was 0.24. Since version 0.26 has been released, EventLoop 2.0 is also introduced which is a breaking change of its usage.
This repo currently still uses the old EventsLoop.

We can find some artifacts on texture rendering.
Examples in chapter05 including diff-ibl and render-to-tex share this issue.

The fps rate of this example is extremely slow and it fails to release the power of draw instanced.

When running the above code on my windows machine, insert_debug_marker return Err(()) and "Start debugging" does not output to the console. It should means the backend doesn't support this functionality as explain in glium docs, but the debug message can print to console and seem work well.

When running the above code on my mbp running macOS 10.14.5, insert_debug_marker return Ok(()) which means this feature should be supported. But actually there aren't any debug message output to the console.

When running chapter06 blur example, the rendering image looks darker. I found that the uniform array Weight does not set to the value I transfer from CPU.
After set the Weight as pre-calculate constants, the example finally renders the correct image.