Module bloom_pipeline 

Proper Bloom Pipeline — multi-level downsample/upsample bloom with brightness threshold.

Only intentionally bright things glow. UI text (emission 0.0) never blooms. Damage numbers (emission 1.5), crits (emission 2.5), spells (emission 2.0+), boss auras (emission 1.0) all bloom at appropriate intensities.

Pipeline

scene_emission_tex (from glyph fragment shader, attachment 1)
  └─ Threshold extract (luminance > threshold) ─▶ bright_tex (full res)
      ├─ Downsample ½  ─▶ mip[0] ── H blur ── V blur ─▶ blurred[0]
      ├─ Downsample ¼  ─▶ mip[1] ── H blur ── V blur ─▶ blurred[1]
      ├─ Downsample ⅛  ─▶ mip[2] ── H blur ── V blur ─▶ blurred[2]
      ├─ Downsample 1/16 ─▶ mip[3] ── H blur ── V blur ─▶ blurred[3]
      └─ Downsample 1/32 ─▶ mip[4] ── H blur ── V blur ─▶ blurred[4]
  Upsample chain: blurred[4] + blurred[3] + ... + blurred[0] ─▶ bloom_result
  Composite: scene_color + bloom_result × intensity ─▶ output

Structs

BloomPipelineState

Describes the full multi-level bloom pipeline state for one frame.

BloomStats

Per-frame bloom statistics.

EmissionPresets

Standard emission values for different game element categories. These control which elements participate in bloom and how strongly.

ThemeBloom

Bloom intensity profiles per game theme.

Constants

BLOOM_BLUR_FRAG

Separable Gaussian blur with variable sigma. Direction (1,0) for horizontal, (0,1) for vertical.

BLOOM_DOWNSAMPLE_FRAG

Downsample shader (box filter 2x2). Takes a texture and renders it at half resolution.

BLOOM_THRESHOLD_FRAG

Brightness threshold extraction shader.

BLOOM_UPSAMPLE_FRAG

Upsample shader (bilinear + additive blend). Combines the current mip level with the upsampled lower mip.