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feat: quad shadows

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Nick Senger 2023-11-08 19:12:53 -08:00 • committed by Héctor Ramón Jiménez
parent b3e3f6e3c9
commit cc906c83cd
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GPG key ID: 7CC46565708259A7
33 changed files with 305 additions and 25 deletions
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36
wgpu/src/shader/quad/solid.wgsl
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@ -6,6 +6,9 @@ struct SolidVertexInput {
@location(3) border_color: vec4<f32>,
@location(4) border_radius: vec4<f32>,
@location(5) border_width: f32,
@location(6) shadow_color: vec4<f32>,
@location(7) shadow_offset: vec2<f32>,
@location(8) shadow_blur_radius: f32,
}
struct SolidVertexOutput {
@ -16,14 +19,19 @@ struct SolidVertexOutput {
@location(3) scale: vec2<f32>,
@location(4) border_radius: vec4<f32>,
@location(5) border_width: f32,
@location(6) shadow_color: vec4<f32>,
@location(7) shadow_offset: vec2<f32>,
@location(8) shadow_blur_radius: f32,
}
@vertex
fn solid_vs_main(input: SolidVertexInput) -> SolidVertexOutput {
var out: SolidVertexOutput;
var pos: vec2<f32> = input.pos * globals.scale;
var scale: vec2<f32> = input.scale * globals.scale;
var pos: vec2<f32> = (input.pos + min(input.shadow_offset, vec2<f32>(0.0, 0.0)) - input.shadow_blur_radius) * globals.scale;
var quad_pos: vec2<f32> = input.pos * globals.scale;
var scale: vec2<f32> = (input.scale + vec2<f32>(abs(input.shadow_offset.x), abs(input.shadow_offset.y)) + input.shadow_blur_radius * 2.0) * globals.scale;
var quad_scale: vec2<f32> = input.scale * globals.scale;
var min_border_radius = min(input.scale.x, input.scale.y) * 0.5;
var border_radius: vec4<f32> = vec4<f32>(
@ -43,10 +51,13 @@ fn solid_vs_main(input: SolidVertexInput) -> SolidVertexOutput {
out.position = globals.transform * transform * vec4<f32>(vertex_position(input.vertex_index), 0.0, 1.0);
out.color = input.color;
out.border_color = input.border_color;
out.pos = pos;
out.scale = scale;
out.pos = quad_pos;
out.scale = quad_scale;
out.border_radius = border_radius * globals.scale;
out.border_width = input.border_width * globals.scale;
out.shadow_color = input.shadow_color;
out.shadow_offset = input.shadow_offset * globals.scale;
out.shadow_blur_radius = input.shadow_blur_radius * globals.scale;
return out;
}
@ -95,5 +106,20 @@ fn solid_fs_main(
dist
);
return vec4<f32>(mixed_color.x, mixed_color.y, mixed_color.z, mixed_color.w * radius_alpha);
let quad_color = vec4<f32>(mixed_color.x, mixed_color.y, mixed_color.z, mixed_color.w * radius_alpha);
if input.shadow_color.a > 0.0 {
let shadow_distance = rounded_box_sdf(input.position.xy - input.pos - input.shadow_offset - (input.scale / 2.0), input.scale / 2.0, border_radius);
let shadow_alpha = 1.0 - smoothstep(-input.shadow_blur_radius, input.shadow_blur_radius, shadow_distance);
let shadow_color = input.shadow_color;
let base_color = select(
vec4<f32>(shadow_color.x, shadow_color.y, shadow_color.z, 0.0),
quad_color,
quad_color.a > 0.0
);
return mix(base_color, shadow_color, (1.0 - radius_alpha) * shadow_alpha);
} else {
return quad_color;
}
}