fyne-io/fyne

Draw canvas primitives using OpenGL?

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#563 opened on Dec 4, 2019

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help wantedoptimization

Description

Looking at the gl driver code for drawing primitives, it appears everything is rasterized in software, and then OpenGL is only used to draw the resulting rasters to the screen. Since there is an OpenGL dependency anyway, why not use OpenGL to draw the primitives? It must have been considered. Is it something planned for the future? Are there strong reasons not to?

Contributor guide

Tech stack
go
Domain
frontenddesktop
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
5
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
unclear
Prerequisites
Go programmingOpenGL experienceFyne framework internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
10
Research direction
The issue is a discussion about replacing software rasterization with OpenGL for drawing primitives in Fyne's gl driver. The current implementation in the gl driver uses software rendering and then uploads to OpenGL. To implement this, one would need to study the existing gl driver code (likely in internal/driver/gl/), understand how primitives are drawn, and evaluate the feasibility and performance implications of using OpenGL directly. The discussion in the comments includes various perspectives on the trade offs, so reading through the comments is essential to understand the context and any blockers.