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examples: gkurve added shapes and textures (#284)

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PiergiorgioZagaria 2022-05-22 17:52:40 +02:00 • committed by GitHub
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4 changed files with 313 additions and 123 deletions
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45
examples/gkurve/frag.wgsl
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@ -1,8 +1,12 @@
struct FragUniform {
type_: u32,
padding: vec3<f32>,
texture_index: i32,
padding: vec2<f32>,
blend_color: vec4<f32>,
}
@binding(1) @group(0) var<storage> ubos: array<FragUniform>;
@binding(2) @group(0) var mySampler: sampler;
@binding(3) @group(0) var myTexture: texture_2d_array<f32>;
@stage(fragment) fn main(
@location(0) uv: vec2<f32>,
@ -15,17 +19,16 @@ struct FragUniform {
// return vec4<f32>(0.0, bary.y, 0.0, 1.0); // [1.0 (bottom-left vertex), 1.0 (top-right face)]
// Example 2: Render gkurve primitives
var inversion = -1.0;
if(ubos[triangle_index].type_ == 1u) {
// Solid triangle
return vec4<f32>(0.0, 1.0, 0.0, 1.0);
} else if(ubos[triangle_index].type_ == 2u) {
// Concave (inverted quadratic bezier curve)
inversion = -1.0;
} else {
// Convex (quadratic bezier curve)
inversion = 1.0;
}
// Concave (inverted quadratic bezier curve)
// inversion = -1.0;
// Convex (inverted quadratic bezier curve)
// inversion = 1.0;
let inversion = select( 1.0, -1.0, ubos[triangle_index].type_ == 1u);
// Texture uvs
// (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].texture_index) * ubos[triangle_index].blend_color;
// Gradients
let px = dpdx(bary.xy);
@ -42,10 +45,18 @@ struct FragUniform {
dist /= 300.0;
// Border rendering.
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); }
// 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); }
// Fill color
if (dist < 0.0) { discard; }
return vec4<f32>(0.0, 1.0, 0.0, 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);
return color * f32(dist >= 0.0 || ubos[triangle_index].type_ == 2u);
}