EnderTheCoder
889ce945f2
The engine now runs on a plain Web Worker (no SDL, no PROXY_TO_PTHREAD: in a pthread Emscripten proxies every filesystem syscall to the main browser thread, where synchronous XHR - and thus FS.createLazyFile - is forbidden). A page/worker pair transfers an OffscreenCanvas and forwards DOM input; assets load lazily from an embedded manifest, so entering a map fetches only that map and its tiles. Presentation: ra3.webgpu (WebGPU via Emscripten's emdawnwebgpu port, WGSL shaders, the default on wasm) and ra3.wasmgl (WebGL2, GLSL ES). The legacy SDL ra3.webgl backend is removed.
39 lines
1.4 KiB
WebGPU Shading Language
39 lines
1.4 KiB
WebGPU Shading Language
// WebGPU counterpart of the 2D image path (the WGSL port of
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// webgl_scene_vert/frag.glsl and the Vulkan scene shaders).
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//
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// Bind group 0: uniform { rect: vec4<f32>; }, the scene texture and a sampler.
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// WebGPU clip space is +Y up, matching GL, so the vertex flips Y the same way.
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struct SceneUniforms {
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rect: vec4<f32>, // xy = top-left (0..1), zw = size (0..1)
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};
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@group(0) @binding(0) var<uniform> u_scene: SceneUniforms;
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@group(0) @binding(1) var u_scene_tex: texture_2d<f32>;
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@group(0) @binding(2) var u_scene_samp: sampler;
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struct SceneOut {
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@builtin(position) position: vec4<f32>,
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@location(0) uv: vec2<f32>,
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};
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@vertex
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fn vs_main(@builtin(vertex_index) vertex_index: u32) -> SceneOut {
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let p = vec2<f32>(f32((vertex_index << 1u) & 2u), f32(vertex_index & 2u));
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var out: SceneOut;
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out.uv = (p - u_scene.rect.xy) / u_scene.rect.zw;
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out.position = vec4<f32>(p.x * 2.0 - 1.0, 1.0 - p.y * 2.0, 0.0, 1.0);
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return out;
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}
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@fragment
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fn fs_main(in: SceneOut) -> @location(0) vec4<f32> {
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// Only the destination rect is drawn; outside it the previous contents stay.
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if (in.uv.x < 0.0 || in.uv.x > 1.0 || in.uv.y < 0.0 || in.uv.y > 1.0) {
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discard;
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}
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// The image is 0xAARRGGBB (BGRA in memory); swizzle it back.
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let c = textureSampleLevel(u_scene_tex, u_scene_samp, in.uv, 0.0);
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return vec4<f32>(c.b, c.g, c.r, c.a);
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}
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