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Make circles generic

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Signed-off-by: András Schmelczer <andras@schmelczer.dev>
This commit is contained in:
Andras Schmelczer 2022-01-29 21:12:11 +01:00
parent 7f431d05b9
commit a53621648c
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GPG key ID: 39260B5B0614A13E
1 changed files with 19 additions and 11 deletions
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30
src/drawables/shapes/meta-circle-factory.ts
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@ -2,6 +2,7 @@ import { mat2d, vec2, vec3, vec4 } from 'gl-matrix';
import { codeForColorAccess } from '../../helper/code-for-color-access';
import { DrawableDescriptor } from '../drawable-descriptor';
import { EmptyDrawable } from '../empty-drawable';
import { numberToGlslFloat } from '../../helper/number-to-glsl-float';
/**
* @category Drawable
@ -12,36 +13,41 @@ class MetaCircleBase extends EmptyDrawable {
}
}
let _id = 0;
/**
* @category Drawable
*/
export const MetaCircleFactory = (color: vec3 | vec4 | number): typeof MetaCircleBase => {
export const MetaCircleFactory = (
color: vec3 | vec4 | number,
k = 32
): typeof MetaCircleBase => {
class MetaCircle extends MetaCircleBase {
public static descriptor: DrawableDescriptor = {
sdf: {
shader: `
uniform vec2 metaCircleCenters[META_CIRCLE_COUNT];
uniform float metaCircleRadii[META_CIRCLE_COUNT];
uniform vec2 metaCircleCenters${_id}[META_CIRCLE_COUNT${_id}];
uniform float metaCircleRadii${_id}[META_CIRCLE_COUNT${_id}];
const float k = 32.0;
float metaCircleMinDistance(vec2 target, out vec4 color) {
float metaCircleMinDistance${_id}(vec2 target, out vec4 color) {
const float k = ${numberToGlslFloat(k)};
color = ${codeForColorAccess(color)};
float res = 0.0;
for (int i = 0; i < META_CIRCLE_COUNT; i++) {
float dist = distance(metaCircleCenters[i], target) - metaCircleRadii[i];
for (int i = 0; i < META_CIRCLE_COUNT${_id}; i++) {
float dist = distance(metaCircleCenters${_id}[i], target) - metaCircleRadii${_id}[i];
res += exp2(-k * dist);
}
return -log2(res) / k;
}
`,
distanceFunctionName: 'metaCircleMinDistance',
distanceFunctionName: `metaCircleMinDistance${_id}`,
},
propertyUniformMapping: {
center: 'metaCircleCenters',
radius: 'metaCircleRadii',
center: `metaCircleCenters${_id}`,
radius: `metaCircleRadii${_id}`,
},
uniformCountMacroName: 'META_CIRCLE_COUNT',
uniformCountMacroName: `META_CIRCLE_COUNT${_id}`,
shaderCombinationSteps: [0, 1, 2, 3, 8, 16],
empty: new MetaCircle(vec2.create(), 0),
};
@ -58,5 +64,7 @@ export const MetaCircleFactory = (color: vec3 | vec4 | number): typeof MetaCircl
}
}
_id++;
return MetaCircle;
};