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examples/gkurve: update wireframe rendering to 2 barycentric coordinates

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2022-05-22 22:57:10 -07:00
parent 38091d0d1b
commit 8d067b62c2
1 changed files with 22 additions and 10 deletions
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32
examples/gkurve/frag.wgsl
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@ -27,7 +27,7 @@ struct FragUniform {
// (These two could be cut with vec2(0.0,1.0) + uv * vec2(1.0,-1.0))
var correct_uv = uv;
correct_uv.y = 1.0 - correct_uv.y;
let color = textureSample(myTexture, mySampler, correct_uv) * ubos[triangle_index].blend_color;
var color = textureSample(myTexture, mySampler, correct_uv) * ubos[triangle_index].blend_color;
// Gradients
let px = dpdx(bary.xy);
@ -44,18 +44,30 @@ struct FragUniform {
dist /= 300.0;
// Border rendering.
let border_color = vec4<f32>(1.0, 0.0, 0.0, 1.0);
let border_width = 3.0;
let border_smoothing = 1.0;
// if (dist > 0.0 && dist <= 0.1) { return vec4<f32>(1.0, 0.0, 0.0, 1.0); }
// if (dist > 0.2 && dist <= 0.3) { return vec4<f32>(0.0, 0.0, 1.0, 1.0); }
// WIREFRAME
// var barys = bary;
// barys.z = 1.0 - barys.x - barys.y;
// let deltas = fwidth(barys);
// let smoothing = deltas * 1.0;
// let thickness = deltas * 0.25;
// barys = smoothstep(thickness, thickness + smoothing, barys);
// let min_bary = min(barys.x, min(barys.y, barys.z));
// color = vec4(min_bary * color.xyz, 1.0);
// // Wireframe rendering.
// let right_face_dist = bary.y;
// let bottom_face_dist = bary.x-bary.y;
// let left_face_dist = 1.0 - ((bottom_face_dist*2.0) + bary.y);
// let normal_bary = vec3<f32>(right_face_dist, bottom_face_dist, left_face_dist);
// let fwd = fwidth(normal_bary);
// let w = smoothstep(border_width * fwd, (border_width + border_smoothing) * fwd, normal_bary);
// let width = 1.0 - min(min(w.x, w.y), w.z);
// let epsilon = 0.001;
// if (right_face_dist >= -epsilon && right_face_dist <= width
// || left_face_dist >= -epsilon && left_face_dist <= width
// || bottom_face_dist >= -epsilon && bottom_face_dist <= width) {
// color = mix(color, border_color, width);
// if (dist < 0.0 && ubos[triangle_index].type_ != 2u) {
// return vec4<f32>(border_color.rgb, width);
// }
// }
return color * f32(dist >= 0.0 || ubos[triangle_index].type_ == 2u);
}