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6c1d695fc6
This implements web support for taking screenshots in an eframe app (and adds a nice demo). It also updates the native screenshot implementation to work with the wgpu gl backend. The wgpu implementation is quite different than the native one because we can't block to wait for the screenshot result, so instead I use a channel to pass the result to a future frame asynchronously. * Closes <https://github.com/emilk/egui/issues/5425> * [x] I have followed the instructions in the PR template https://github.com/user-attachments/assets/67cad40b-0384-431d-96a3-075cc3cb98fb
44 lines
1.0 KiB
WebGPU Shading Language
44 lines
1.0 KiB
WebGPU Shading Language
struct VertexOutput {
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@builtin(position) position: vec4<f32>,
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};
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var<private> positions: array<vec2f, 3> = array<vec2f, 3>(
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vec2f(-1.0, -3.0),
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vec2f(-1.0, 1.0),
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vec2f(3.0, 1.0)
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);
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// meant to be called with 3 vertex indices: 0, 1, 2
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// draws one large triangle over the clip space like this:
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// (the asterisks represent the clip space bounds)
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//-1,1 1,1
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// ---------------------------------
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// | * .
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// | * .
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// | * .
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// | * .
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// | * .
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// | * .
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// |***************
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// | . 1,-1
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// | .
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// | .
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// | .
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// | .
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// |.
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@vertex
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fn vs_main(@builtin(vertex_index) vertex_index: u32) -> VertexOutput {
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var result: VertexOutput;
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result.position = vec4f(positions[vertex_index], 0.0, 1.0);
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return result;
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}
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@group(0)
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@binding(0)
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var r_color: texture_2d<f32>;
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@fragment
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fn fs_main(vertex: VertexOutput) -> @location(0) vec4<f32> {
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return textureLoad(r_color, vec2i(vertex.position.xy), 0);
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}
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