sugarloaf 0.4.4

Sugarloaf is Rio rendering engine, designed to be multiplatform. It is based on WebGPU, Rust library for Desktops and WebAssembly for Web (JavaScript). This project is created and maintained for Rio terminal purposes but feel free to use it.
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#version 450

// Per-instance quad vertex shader, ported from `vs_instanced` in
// `sugarloaf/src/renderer/renderer.metal`. One `QuadInstance` per
// instance, vertex_id picks the corner. 4 vertices per instance,
// drawn as `TRIANGLE_STRIP`.
//
// Per-instance vertex layout matches `QuadInstance` in
// `sugarloaf/src/renderer/batch.rs` (96 bytes):
//   loc 0  R32G32B32_SFLOAT     pos[3]            (offset 0)
//   loc 1  R32G32B32A32_SFLOAT  color[4]          (offset 12)
//   loc 2  R32G32B32A32_SFLOAT  uv_rect[4]        (offset 28)
//   loc 3  R32G32_SINT          layers[2]         (offset 44)
//   loc 4  R32G32_SFLOAT        size[2]           (offset 52)
//   loc 5  R32G32B32A32_SFLOAT  corner_radii[4]   (offset 60)
//   loc 6  R32_SINT             underline_style   (offset 76)
//   loc 7  R32G32B32A32_SFLOAT  clip_rect[4]      (offset 80)
//
// This Vulkan port renders only the SDF rounded-rect fill path; the
// glyph atlas sampling and underline pattern paths from
// renderer.metal are not yet ported (grid text + UI text overlay
// have their own pipelines for those).

layout(set = 0, binding = 0, std140) uniform Globals {
    mat4 transform;
    uint input_colorspace;
    uint _pad0;
    uint _pad1;
    uint _pad2;
} globals;

layout(location = 0) in vec3  in_pos;
layout(location = 1) in vec4  in_color;
layout(location = 2) in vec4  in_uv_rect;
layout(location = 3) in ivec2 in_layers;
layout(location = 4) in vec2  in_size;
layout(location = 5) in vec4  in_corner_radii;
layout(location = 6) in int   in_underline_style;
layout(location = 7) in vec4  in_clip_rect;

layout(location = 0)      out vec4 out_color;
layout(location = 1)      out vec2 out_uv;
layout(location = 2) flat out ivec2 out_layers;
layout(location = 3)      out vec4 out_corner_radii;
layout(location = 4)      out vec2 out_rect_size;
layout(location = 5) flat out int  out_underline_style;
layout(location = 6) flat out vec4 out_clip_rect;

// Unit quad corners for triangle strip: TL, BL, TR, BR.
const vec2 UNIT_QUAD[4] = vec2[](
    vec2(0.0, 0.0),
    vec2(0.0, 1.0),
    vec2(1.0, 0.0),
    vec2(1.0, 1.0)
);

void main() {
    vec2 unit = UNIT_QUAD[gl_VertexIndex];
    vec2 pos = in_pos.xy + unit * in_size;
    vec2 uv = mix(in_uv_rect.xy, in_uv_rect.zw, unit);

    gl_Position = globals.transform * vec4(pos, in_pos.z, 1.0);

    out_color = in_color;
    out_uv = uv;
    out_layers = in_layers;
    out_corner_radii = in_corner_radii;
    out_rect_size = in_size;
    out_underline_style = in_underline_style;
    out_clip_rect = in_clip_rect;
}