Module ui_layer_renderer 

UI layer renderer — executes UiDrawCommands with a separate shader program, orthographic projection, and no post-processing.

Uses the same instanced glyph rendering approach as the 3D pass but with:

• Orthographic projection: (0,0) = top-left, (W,H) = bottom-right
• Depth test disabled
• Alpha blending enabled for semi-transparent panels
• Optional SDF path for razor-sharp text at all scales

Structs

RectInstance

A solid-color rectangle instance for panel backgrounds and bars.

UiLayerRenderer

Renderer for the screen-space UI layer.

Constants

RECT_FRAG_SRC

Fragment shader for solid-color rectangles.

RECT_VERT_SRC

Vertex shader for solid-color rectangles.

UI_FRAG_SRC

Fragment shader for UI layer — simple textured quad, no post-processing unless emission > 0.

UI_VERT_SRC

Vertex shader for UI layer — same as glyph.vert but without Y-flip (the ortho projection handles orientation correctly).