forked from 1b-agent/opencadstudio-upstream
ramox81andClaude Opus 5.5
5de0ce069f
A transparent pixel wrote depth, hiding lines and objects under the image that were drawn after it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
74 lines
2.9 KiB
WebGPU Shading Language
74 lines
2.9 KiB
WebGPU Shading Language
// Textured-quad shader for raster images (RasterImage entity).
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// Renders a four-vertex quad (two triangles) with a sampled texture.
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// ── Bind group 0: shared projection uniforms ─────────────────────────────────
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// Must match the shared `Uniforms` struct (scene::pipeline::uniforms, 112 B).
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struct Uniforms {
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viewport_size: vec2<f32>,
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world_per_pixel: f32,
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lwdisplay_enable: f32,
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flat_shade: f32,
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transparency_enable: f32,
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_pad: vec2<f32>,
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// Relative-to-eye (double-single): see wire.wgsl.
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view_rot: mat4x4<f32>,
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eye_high: vec3<f32>,
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_pad_eh: f32,
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eye_low: vec3<f32>,
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_pad_el: f32,
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};
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@group(0) @binding(0) var<uniform> u: Uniforms;
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// ── Bind group 1: per-image texture + sampler ────────────────────────────────
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@group(1) @binding(0) var img_texture: texture_2d<f32>;
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@group(1) @binding(1) var img_sampler: sampler;
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// Per-image params (fade, clip flag, etc.)
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struct ImageParams {
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opacity: f32,
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draw_depth: f32, // signed (-1,1) draw-order bias; 0 = neutral
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use_alpha: f32, // 1 = pixel alpha applies, 0 = pixels draw opaque
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_pad2: f32,
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};
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@group(1) @binding(2) var<uniform> img_params: ImageParams;
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// ── Vertex stage ──────────────────────────────────────────────────────────────
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struct VertIn {
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@location(0) pos: vec3<f32>,
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@location(1) uv: vec2<f32>,
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@location(2) pos_low: vec3<f32>,
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@location(3) translation: vec3<f32>,
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@location(4) translation_low: vec3<f32>,
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@location(5) draw_depth: f32,
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};
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struct VertOut {
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@builtin(position) clip_pos: 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(in: VertIn) -> VertOut {
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var out: VertOut;
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let rel = (in.pos + in.translation - u.eye_high)
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+ (in.pos_low + in.translation_low - u.eye_low);
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out.clip_pos = u.view_rot * vec4<f32>(rel, 1.0);
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out.clip_pos = apply_draw_order(out.clip_pos, img_params.draw_depth + in.draw_depth);
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out.uv = in.uv;
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return out;
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}
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// ── Fragment stage ────────────────────────────────────────────────────────────
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@fragment
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fn fs_main(in: VertOut) -> @location(0) vec4<f32> {
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let col = textureSample(img_texture, img_sampler, in.uv);
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let alpha = select(1.0, col.a, img_params.use_alpha > 0.5);
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// A fully transparent pixel leaves no depth behind, so what lies under
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// the image (drawn before or after it) shows through.
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if (alpha * img_params.opacity <= 0.0) {
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discard;
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}
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return vec4<f32>(col.rgb, alpha * img_params.opacity);
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}
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