Add js/wasm (WebGL2) backend#8
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Parallel WebGL2 implementation of Shader, Texture, VertexSlice, Frame, and VertexArray under the `js && wasm` build tag; existing files now tagged `!js` so desktop builds are untouched. Includes a GLSL 330 core to 300 es preprocessor so consumers can run their existing shaders in the browser unchanged. Also adds `BlendFuncSeparate` and `BlendEquation` helpers needed by downstream pixel consumers. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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… test - examples/demo imports GLFW and broke GOOS=js GOARCH=wasm go build ./... (the advertised build test). Tag it !js so the example is desktop-only. - Document the SetContext / shader-preprocessor behavior under WebGL2 in the README and package doc so users building for the browser know the required init order and the GLSL 330 -> 300 es adaptation. - Add a unit test for preprocessShaderForES300. The rest of the WebGL2 backend still needs a real context to exercise, but the preprocessor is pure Go and worth pinning down. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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dusk125
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Apr 22, 2026
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Do you mind breaking this file out into its component files (shader_wasm, frame_wasm, etc)? I appreciate trying to keep the wasm stuff contained, but I think it'll be easier to review/maintain going forward (and more easily shows why the frame.go, etc have the !js build flag
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Summary
Adds a parallel WebGL2 implementation of the glhf primitives so consumers can build for
GOOS=js GOARCH=wasmwithout changing call-sites. Everything is keyed on thejs && wasmbuild tag; existing files gain//go:build !jsso desktop behavior is untouched.gl_wasm.go— thin wrappers around thesyscall/jsWebGL2 context and enum map.glhf_wasm.go— WebGL2 implementations ofShader,Texture,VertexSlice,VertexArray,Frame, state setters (Clear,Bounds, blend funcs), plus a#version 330 core→#version 300 espreprocessor so consumers can compile their existing shader source unchanged. The preprocessor is covered byglhf_wasm_test.go.orphan.go(desktop build) grows additional helpers downstream consumers were reaching past glhf for:BlendFuncSeparate,BlendEquation— needed by pixel'sComposeScreenpath.ActiveTexture(unit int)— needed by pixel's sampler-uniform path.SrcColor,DstColor,OneMinusSrcColor,OneMinusDstColor— needed byComposeMultiplyand friends.doc.goandREADME.mdhave a new section describing the WASM backend (SetContextusage, GLSL adaptation,CLAMP_TO_BORDER→CLAMP_TO_EDGEsubstitution).examples/demo/main.gois tagged!jssince it imports GLFW.Related PRs
Test plan
go build ./...).GOOS=js GOARCH=wasm go build ./...succeeds;go test -ccompiles the new test file cleanly.