scalarfillmaterial.h File Reference

#include <QSGGeometry>
#include <QSGMaterial>

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Classes
struct	ScalarFillVertex
class	ScalarFillMaterial

Functions
const QSGGeometry::AttributeSet &	scalarFillAttributes ()

Detailed Description

Author

Caleb Buahin caleb.nosp@m..bua.nosp@m.hin@g.nosp@m.mail.nosp@m..com

Date

2026

License\n GPL-3.0-or-later

QSG-2D-1M Phase 8 — GPU scalar→color mapping for the 2D results smooth depth fill.

Vertices carry (x, y, scalar); the fragment shader normalizes the scalar with the material's (vMin, invRange) uniforms — the exact contract of ScalarRampLut::normalize — and samples a 256×1 ramp LUT texture baked from the active ScalarFillStyle. Consequences:

• a ramp/style edit re-bakes 256 texels + two floats instead of re-coloring every mesh vertex on the CPU,
• a time tick uploads one float per vertex (scalar) instead of RGBA colors, and positions stay untouched either way.

Enabled by the results renderer only when OPENSWMM_QSG_SHADER_FILL=1 — shader output needs visual parity verification (plan Phase 8), so the CPU-colored path stays the default until confirmed.

Function Documentation

scalarFillAttributes()

const QSGGeometry::AttributeSet & scalarFillAttributes

(

)

Attribute set matching ScalarFillVertex (location 0 = vec2 position, location 1 = float scalar).

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