playcanvas
Version:
PlayCanvas WebGL game engine
30 lines (28 loc) • 1.72 kB
JavaScript
var wgslSampleCatmullRomPS = `
fn SampleTextureCatmullRom(tex: texture_2d<f32>, texSampler: sampler, uv: vec2f, texSize: vec2f) -> vec4f {
let samplePos: vec2f = uv * texSize;
let texPos1: vec2f = floor(samplePos - 0.5) + 0.5;
let f: vec2f = samplePos - texPos1;
let w0: vec2f = f * (-0.5 + f * (1.0 - 0.5 * f));
let w1: vec2f = 1.0 + f * f * (-2.5 + 1.5 * f);
let w2: vec2f = f * (0.5 + f * (2.0 - 1.5 * f));
let w3: vec2f = f * f * (-0.5 + 0.5 * f);
let w12: vec2f = w1 + w2;
let offset12: vec2f = w2 / w12;
let texPos0: vec2f = (texPos1 - 1.0) / texSize;
let texPos3: vec2f = (texPos1 + 2.0) / texSize;
let texPos12: vec2f = (texPos1 + offset12) / texSize;
var result: vec4f = vec4f(0.0);
result = result + textureSampleLevel(tex, texSampler, vec2f(texPos0.x, texPos0.y), 0.0) * w0.x * w0.y;
result = result + textureSampleLevel(tex, texSampler, vec2f(texPos12.x, texPos0.y), 0.0) * w12.x * w0.y;
result = result + textureSampleLevel(tex, texSampler, vec2f(texPos3.x, texPos0.y), 0.0) * w3.x * w0.y;
result = result + textureSampleLevel(tex, texSampler, vec2f(texPos0.x, texPos12.y), 0.0) * w0.x * w12.y;
result = result + textureSampleLevel(tex, texSampler, vec2f(texPos12.x, texPos12.y), 0.0) * w12.x * w12.y;
result = result + textureSampleLevel(tex, texSampler, vec2f(texPos3.x, texPos12.y), 0.0) * w3.x * w12.y;
result = result + textureSampleLevel(tex, texSampler, vec2f(texPos0.x, texPos3.y), 0.0) * w0.x * w3.y;
result = result + textureSampleLevel(tex, texSampler, vec2f(texPos12.x, texPos3.y), 0.0) * w12.x * w3.y;
result = result + textureSampleLevel(tex, texSampler, vec2f(texPos3.x, texPos3.y), 0.0) * w3.x * w3.y;
return result;
}
`;
export { wgslSampleCatmullRomPS as default };