GoGPU
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Here is a gogpu window that draws a triangle: Here is a gg.Context that draws a circle: How do you combine these to draw a circle in a gogpu.App ? The DrawTriangle is commented as being put there for demo... well, what is the proper way of using gg.Context functionality to render in a gogpu.App ? |
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Replies: 14 comments 14 replies
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Hi @amortaza, Great question!
Both share the same gogpu/wgpu (Pure Go WebGPU) foundation. Current Architecture: Current State: gg renders to a Workaround — Texture Upload: // 1. Draw with gg
dc := gg.NewContext(800, 600)
dc.SetRGB(1, 0, 0)
dc.DrawCircle(170, 170, 150)
dc.Fill()
img := dc.Image() // *image.RGBA
// 2. Upload to gogpu texture (manual for now)
app.OnDraw(func(gc *gogpu.Context) {
// Create texture from img, draw as quad
})Future Integration (Planned): A Would you like to open a feature request for this integration? It would help us prioritize. |
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✅ Integration Available in gg v0.21.0!Great news! The gg ↔ gogpu integration is now available in gg v0.21.0. New: render/ packageimport (
"github.com/gogpu/gg/render"
"github.com/gogpu/gogpu"
)
func main() {
app := gogpu.NewApp(gogpu.DefaultConfig().
WithTitle("GoGPU + gg Integration").
WithSize(800, 600))
var renderer render.Renderer
var scene *render.Scene
app.OnInit(func(gc *gogpu.Context) {
// gg receives device from gogpu (DeviceProvider pattern)
renderer = render.NewGPURenderer(gc.DeviceHandle())
scene = render.NewScene()
})
app.OnDraw(func(gc *gogpu.Context) {
scene.Reset()
// Draw with gg's Scene API
scene.SetFillColor(color.RGBA{255, 0, 0, 255})
scene.Circle(170, 170, 150)
scene.Fill()
// Render to gogpu surface
renderer.Render(gc.SurfaceTarget(), scene)
})
app.Run()
}Key Components
Shared InfrastructureBoth gogpu and gg now use gpucontext for shared interfaces:
DocumentationLet us know if you have questions about the new integration! |
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Is touch input supported? |
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The sample code does not compile. In particular app.OnInit() is not defined - searching for OnInit at the organization level in github gives 1 result - the code in this discussion :) Also gc.DeviceHandle() is not defined... gc.SurfaceTarget() is not defined. |
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Hi @amortaza, Thanks for catching this! The method names were changed before release, but we forgot to update the documentation. Correct API: // ✅ These methods exist:
provider := app.GPUContextProvider() // gpucontext.DeviceProvider
events := app.EventSource() // gpucontext.EventSource
// ❌ These do NOT exist:
// app.OnInit()
// gc.DeviceHandle()
// gc.SurfaceTarget()Working pattern: var initialized bool
app.OnDraw(func(dc *gogpu.Context) {
if !initialized {
provider := app.GPUContextProvider()
if provider != nil {
// Use provider.Device(), provider.Queue(), etc.
initialized = true
}
}
dc.DrawTriangleColor(gmath.CornflowerBlue)
})See: We'll fix the docs. Thanks! |
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Touch Input SupportTouch input is planned but not yet implemented. Current Status
The What's Needed
This is on our roadmap. If you need this feature urgently, please open a feature request issue so we can prioritize accordingly. |
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You linked the file examples/gpucontext_integration/main.go in that file it gives the sample code: However, gg.NewGPUCanvas() does not exist. I see that the provider comes from app.GPUContextProvider() and the provider is used with gg.NewGPUCanvas() to get canvas which then is used to get canvas.Context(). But gg does not have a function called "NewGPUCanvas()" |
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I am using gg v0.21.3 |
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Thanks! Let's wait a bit for now; new versions will be released today, and then we'll get back to this issue. The main stage of mutual integration is now underway, so things will be a little different. |
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https://github.com/gogpu/gogpu/blob/main/examples/gg_integration/main.go Example: gg + gogpu integration via ggcanvas |
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Thank you for your efforts. There are still issues. This is regarding the gg_integration/main.go When I use the minimum versions as recommended in the comments in the code: It does not compile. I used the minimum versions because initially i used the latest versions and there were issues. The issues are:
Changing the clear background color seems to have no effect. On what platform are you running the application? |
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I can make the animation work with: When canvas is recreated every frame, it updates correctly. I also tried MarkDirty(), Flush()... they did not display animation. I am still unable to set the background clear color and the text still is not drawn (although I think thats because no font has been selected in the code). |
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Hi @amortaza, Thanks for the detailed report and your patience! Version RequirementsThe The earlier versions you tried (v0.13.3/v0.21.4 and v0.23.0/v0.15.3) predate the current integration architecture. The working example lives in: What Was Fixedv0.24.1 + v0.15.5 (released today) fix an alpha compositing bug that caused:
Root cause: mixed premultiplied/straight alpha conventions between gg's software renderer and gogpu's GPU pipeline. Both now use premultiplied alpha (industry standard). About Your Specific Issues
PlatformWe develop and test on Windows (Win32 backend). Linux (X11/Wayland) and macOS (Cocoa) are supported but less tested. Quick Startgit clone https://github.com/gogpu/gg.git
cd gg/examples/gogpu_integration
go run .Let us know if you still have issues with the latest versions! |
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I am using: There is a fault exception right where this call is made: |
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Hi @amortaza, Thanks for the detailed stack trace and your persistence! What ChangedWe've been preparing the ecosystem for the upcoming gogpu/ui GUI toolkit, which required significant refactoring across packages:
On our system (Windows 10, NVIDIA + Intel GPUs) everything works correctly with these versions — animated circles, correct background color, no crashes. Please UpdateThen run: go get github.com/gogpu/gg@v0.26.0 github.com/gogpu/gogpu@v0.15.6
go mod tidyThe reference example ( You can clone and run it directly: git clone https://github.com/gogpu/gg.git
cd gg/examples/gogpu_integration
go run .If It Still CrashesThe crash you reported (
This will help us reproduce the issue and add a driver-specific workaround if needed. |
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My pleasure to help this project, I hope to use this to develop my own UI framework called Bellina . You can get a sense about the philosophy of design by looking at the simplest example Same error.
Running the reference example that was updated to these versions. go.mod was identical to the reference example. |
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Thank you for the detailed crash report, @amortaza! Root CauseThe crash is in our premultiplied alpha pipeline - a new feature added in v0.15.4 (PR #77). The access violation ( The crash path: FixWe are eliminating the second pipeline entirely - instead of two separate GPU pipelines (one for premultiplied, one for standard alpha), we will use a single pipeline with a uniform-based switch. This avoids the pipeline creation that triggers the crash and is cleaner architecturally. The fix will be in the next gogpu release. We will post here when it's available. |
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Hi @amortaza, The crash fix is available! Updated versions: What Was FixedNVIDIA crash ( The fix: eliminated the second pipeline entirely. Both alpha modes now go through a single pipeline with a uniform-based shader switch. The fix required changes across the entire stack: naga v0.11.0 (SPIR-V codegen fix) → wgpu v0.13.2 → gogpu v0.15.7 → gg v0.26.1. Earlier Issues — All FixedRegarding the problems you reported on Feb 5 (
How to Updatego get github.com/gogpu/gg@v0.26.1 github.com/gogpu/gogpu@v0.15.7
go mod tidyOr run the reference example: git clone https://github.com/gogpu/gg.git
cd gg/examples/gogpu_integration
go run .About BellinaChecked out go-bellina — the node-based If you wanted to use GoGPU as Bellina's HAL backend instead of Available today:
Not yet available (on our roadmap):
Zero CGO throughout — no MSYS2, no C compiler, One thing worth discussing: common UI primitives (geometry types, layout engines, event handling) that any Go UI framework needs. Rather than each project reinventing these, we could potentially unify shared building blocks in the ecosystem. If that's interesting, let's discuss it separately. Please let us know if v0.15.7 works on your RTX 2080! |
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Unfortunately, the exact same issue still happens. I also tried: |
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I appreciate your comments on Bellina. And really hope to use gg/gogpu as the foundation for the graphics. |
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Thank you for testing! To help isolate the issue, could you try the Rust backend (wgpu-native)? This will tell us whether the crash is in our Pure Go WebGPU implementation or in something else (pipeline setup, driver interaction, etc.). Steps:1. Download wgpu-native v27.0.4.0 Go to: https://github.com/gfx-rs/wgpu-native/releases/tag/v27.0.4.0 Download the Windows x86_64 build (MSVC), extract 2. Place the DLL Copy 3. Build with go build -tags rust .This automatically switches from the Pure Go backend to the Rust wgpu-native backend. No code changes needed — 4. Run and report If it works with the Rust backend but crashes with the default (Pure Go) backend, the issue is in our This will help us narrow down the root cause significantly. |
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Using the Rust backend there were NO crashes. The circles animated just fine. However, I expected this change on line 108 to make the background flash different colors, but its a solid dark color (not black). Doing something similar coloring for the center circle DOES make it flash different colors as expected. |
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Great news that the Rust backend works! This confirms the crash is in our Pure Go WebGPU ( About the Background ColorThe canvas background behavior is correct — the 4th parameter in cc.SetRGBA(rand.Float64(), rand.Float64(), rand.Float64(), 0) // alpha=0 = fully transparent!
cc.Clear()This clears the canvas to transparent, so you see the gogpu window background ( To actually change the visible background, either: Option A — Clear canvas with an opaque color (alpha=1): cc.SetRGBA(rand.Float64(), rand.Float64(), rand.Float64(), 1) // alpha=1 = opaque
cc.Clear()Option B — Change the gogpu window background: dc.ClearColor(gmath.Color{R: 0.5, G: 0.2, B: 0.8, A: 1})What's New Since Your Last TestA lot has happened since v0.26.1/v0.15.7! Latest versions: gg v0.27.0–v0.27.1:
gogpu v0.16.0–v0.17.0:
wgpu v0.14.0–v0.15.0:
naga v0.12.0:
Next StepsWe'll create a dedicated issue to track the Pure Go backend crash on NVIDIA RTX 2080. In the meantime, you can continue developing with the Rust backend ( Thank you for your persistence in testing — this helps us enormously! |
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Created a dedicated issue to track the Pure Go backend crash: #82 We'll investigate the |
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@FinGu Do you really think chatbots can create projects of this level? |
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Hi @amortaza, A quick update — we've shipped a significant amount of changes across the entire stack since your last test:
The To test:go get github.com/gogpu/gg@v0.28.1 github.com/gogpu/gogpu@v0.18.1
go mod tidy
go run .The reference example now also supports event-driven rendering — press Space to pause animation (GPU drops to 0%), press again to resume. Would be great to know if the Pure Go backend works on your RTX 2080 now! |
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gogpu/gg#79