Shader Bundler for offline shader transpilation

[kunitoki]

This pull request introduces a new system for building, bundling, and embedding shader programs in the YUP library. The main changes are the addition of a standalone shader bundler tool, new CMake helpers to automate shader bundling and embedding, and updates to the graphics example to use this new workflow. This makes it easier to manage cross-platform shader assets and ensures shaders are compiled and embedded at configure time, even when cross-compiling.

Shader Bundling Tool and Build Integration:

• Added a new standalone console tool, yup_shader_bundler, which takes .vert and .frag GLSL files and produces a .ysl bundle containing transpiled variants for all target shading languages (GLSL, ESSL, HLSL, MSL, WGSL). The tool is built as a host executable, ensuring it works during cross-compilation. (CHANGELOG.md, cmake/tools/shader_bundler/CMakeLists.txt, cmake/tools/shader_bundler/source/main.cpp) [1] [2] [3]

• Introduced a new CMake helper function, yup_add_shader_bundle(), which builds the bundler tool (if needed), generates the shader bundle at configure time, and embeds the resulting binary as a linkable object library. This works transparently across platforms and cross-compilation scenarios. (cmake/yup_shader_bundler.cmake, cmake/yup.cmake) [1] [2]

Example Usage and Demonstration:

• Updated the graphics example to use the new yup_add_shader_bundle() function, embedding the cube's vertex and fragment shaders and linking them into the example. (examples/graphics/CMakeLists.txt, examples/graphics/data/shaders/cube.vert, examples/graphics/data/shaders/cube.frag) [1] [2] [3]

• Modified the SpinningCubeDemo to load shaders from the embedded bundle at runtime using ShaderBundle::loadFromData(), and to compile the GPU pipeline from the bundle rather than raw GLSL source strings. (examples/graphics/source/examples/SpinningCubeDemo.h) [1] [2]

These changes significantly improve shader asset management in YUP, streamline the build process, and provide a robust foundation for cross-platform graphics development.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.40%. Comparing base (e3184f3) to head (ad34527).

Additional details and impacted files

@@                    Coverage Diff                     @@
##           dev/gpu_graphics_try_1     #130      +/-   ##
==========================================================
- Coverage                   78.40%   78.40%   -0.01%     
==========================================================
  Files                         704      704              
  Lines                       69768    69768              
==========================================================
- Hits                        54703    54699       -4     
- Misses                      15065    15069       +4     

Files with missing lines	Coverage Δ
modules/yup_core/yup_core.cpp	100.00% <ø> (ø)

... and 2 files with indirect coverage changes

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