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feat: strided TextureRegionUpdater.UpdateRegion (bytesPerRow) #34

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Merged
lkmavi merged 1 commit into from
Aug 30, 2026
Merged

feat: strided TextureRegionUpdater.UpdateRegion (bytesPerRow) #34

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6 changes: 6 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [0.31.0] - 2026-08-30

### Changed

- **`TextureRegionUpdater.UpdateRegion` — strided upload** (#484) — added `bytesPerRow` parameter (pre-v1.0 signature change). `0` = tightly packed rows (`w * bytesPerPixel`), matching WebGPU `ImageDataLayout.bytesPerRow`. Enables zero-copy dirty-band uploads from full-frame buffers (geckty, ggcanvas) without `extractRegion` memcpy.

## [0.30.0] - 2026-08-30

### Added
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10 changes: 9 additions & 1 deletion ROADMAP.md
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Expand Up @@ -4,8 +4,10 @@

`gpucontext` is the shared foundation for the [gogpu](https://github.com/gogpu) ecosystem, providing interfaces and utilities for GPU resource sharing without circular dependencies.

## Current: v0.29.0
## Current: v0.31.0

- `TextureRegionUpdater.UpdateRegion` strided upload (`bytesPerRow`, #484)
- `DeviceProvider.DownlevelCapabilities()` (ADR-071)
- `DeviceProvider.Features()` — query device capabilities (FeatureRayQuery, etc.)
- SurfaceCompositor interface (ADR-067)
- MouseButton/Modifiers stringers
Expand All @@ -19,6 +21,12 @@

## Released

### v0.31.0 (2026-08-30)
- `TextureRegionUpdater.UpdateRegion` — `bytesPerRow` parameter (pre-v1.0, #484)

### v0.30.0 (2026-08-30)
- `DeviceProvider.DownlevelCapabilities()` (ADR-071)

### v0.29.0 (2026-08-27)
- `DeviceProvider.Features()` — gputypes.Features bitfield for capability queries

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13 changes: 10 additions & 3 deletions texture.go
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Expand Up @@ -45,11 +45,18 @@ type TextureRegionUpdater interface {
// UpdateRegion uploads a sub-rectangle of pixel data to the texture.
// x, y is the top-left corner of the region in the texture.
// w, h is the size of the region.
// data must be exactly w * h * bytesPerPixel bytes (densely packed RGBA rows).
// bytesPerRow is the stride in bytes between consecutive rows in data.
// Pass 0 for tightly packed rows (w * bytesPerPixel) — WebGPU
// ImageDataLayout.bytesPerRow semantics. This eliminates the need for
// callers to extractRegion-copy dirty bands from a full-frame buffer.
//
// When bytesPerRow is 0, data must be exactly w * h * bytesPerPixel bytes.
// When bytesPerRow > 0, data must be at least
// bytesPerRow*(h-1) + w*bytesPerPixel bytes (last row need not be padded).
//
// Returns error if the region exceeds texture bounds, data size is invalid,
// or the texture has been destroyed.
UpdateRegion(x, y, w, h int, data []byte) error
// bytesPerRow is too small, or the texture has been destroyed.
UpdateRegion(x, y, w, h, bytesPerRow int, data []byte) error
}

// TextureDrawer provides texture drawing capabilities for 2D rendering.
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