GPU filter-graph executor. More...

#include "donner/svg/renderer/geode/GeodeFilterEngine.h"

Public Member Functions
	GeodeFilterEngine (GeodeDevice &device, bool verbose=false)
	GeodeFilterEngine (const GeodeFilterEngine &)=delete
GeodeFilterEngine &	operator= (const GeodeFilterEngine &)=delete
wgpu::Texture	execute (const svg::components::FilterGraph &graph, const wgpu::Texture &sourceGraphic, const Box2d &filterRegion, const Transform2d &deviceFromFilter)
	Execute a filter graph against the source-graphic texture.

Detailed Description

GPU filter-graph executor.

Given a FilterGraph and a source-graphic texture (the offscreen layer snapshot captured between pushFilterLayer / popFilterLayer), executes the graph's primitives on the GPU and returns the final output texture.

Intermediate textures between primitives are allocated on demand and keyed by result names.

Currently supports:

feGaussianBlur (two-pass separable Gaussian via compute shader)
feOffset (pixel shift via compute shader)
feColorMatrix (4x5 matrix transform via compute shader)
feFlood (constant color fill via compute shader)
feMerge (alpha-over composite of N inputs via compute shader)
feComposite (Porter-Duff compositing of two inputs via compute shader)
feBlend (W3C Compositing 1 blend modes via compute shader)
feMorphology (erode / dilate via min / max rectangular kernel)
feComponentTransfer (per-channel LUT transform via compute shader)
feConvolveMatrix (NxM kernel convolution via compute shader)
feTurbulence (Perlin noise / fractal noise via compute shader)
feDisplacementMap (per-pixel channel-driven displacement via compute shader)
feDiffuseLighting (Lambertian shading with distant/point/spot lights)
feSpecularLighting (Phong shading with distant/point/spot lights)
feDropShadow (blur alpha + offset + flood-tint + source-over)
feImage (bilinear placement of external raster / in-document fragment)
feTile (wraparound tiling of input subregion across filter region)

Unsupported primitives pass the current buffer through unchanged.

Constructor & Destructor Documentation

◆ GeodeFilterEngine()

donner::geode::GeodeFilterEngine::GeodeFilterEngine	(	GeodeDevice &	device,
		bool	verbose = false )

explicit

Parameters

device	The Geode device (owns wgpu::Device + queue).
verbose	If true, emit one-shot warnings for unsupported primitives.

Member Function Documentation

◆ execute()

wgpu::Texture donner::geode::GeodeFilterEngine::execute	(	const svg::components::FilterGraph &	graph,
		const wgpu::Texture &	sourceGraphic,
		const Box2d &	filterRegion,
		const Transform2d &	deviceFromFilter )

Execute a filter graph against the source-graphic texture.

The source texture must be RGBA8Unorm with TextureBinding usage. The returned texture is a freshly-allocated RGBA8Unorm texture sized to the filter region (or the source dimensions if no region is given).