The imgui-bundle backend cannot sample from our OpenGL FBO textures.
This is a fundamental incompatibility. Frosted glass feature
disabled to allow app to run.
- Add _render_custom_background method as hello_imgui callback
- Render blurred FBO texture as ImGui background
- Use ctypes.cast to convert OpenGL texture ID to ImTextureRef
- Create _create_quad_vao() method that creates VAO with vertex buffer
- Use explicit vertex attributes (a_position, a_texcoord) in shaders
- Bind VAO before glDrawArrays calls
- Use ctypes for proper buffer sizing
The issue is that imgui-bundle uses OpenGL 3.3 core profile which doesn't
support glBegin/glEnd. The shaders require VAO setup which is failing.
This needs proper OpenGL debugging in the imgui-bundle context.
The frosted glass effect crashes with GLError 1282 'invalid operation'
when calling glDrawArrays. This is likely due to missing VAO setup
or OpenGL context issues in the hello_imgui/imgui-bundle environment.
DISABLED the effect by default to allow the app to run.
Feature needs proper OpenGL VAO setup to work.
- Remove _init_blur_pipeline call from _post_init (display_size invalid at startup)
- Add validation for ws.x > 0 and ws.y > 0 before FBO creation
- Add validation for fb_scale > 0 with default fallback to 1.0
- Make _init_blur_pipeline return bool for success/failure
- Update plan.md to reflect current progress
Fixes crash: GLError(err=1281, description=b'invalid value')
- Remove _init_blur_pipeline call from _post_init (display_size not valid yet)
- Add dimension validation in _init_blur_pipeline (ws.x > 0 and ws.y > 0)
- Add fb_scale validation (default to 1.0 if <= 0)
- Lazy init only happens when frosted glass is enabled and dimensions are valid
- Fixes GLError 1281 'invalid value' crash on startup
- Add compile_deepsea_shader() with animated underwater-like GLSL shader
- Add render_deepsea_to_fbo() to render background to scene FBO
- Deep Sea shader features: FBM noise, animated blobs, caustic lines, vignette
- Add deepsea_program to cleanup() for proper resource management
- Add 2 new tests for Deep Sea shader compilation and FBO rendering
Task: Phase 1, Task 2 of frosted_glass_20260313 track
