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Pushed virtually all the shader source into shader files that load as assets.

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Rezmason
2021-10-20 03:20:46 -07:00
parent 39742d73f3
commit d8a1409907
17 changed files with 556 additions and 536 deletions
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339
js/renderer.js
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@@ -1,6 +1,7 @@
import {
extractEntries,
loadImage,
loadText,
makePassFBO,
makeDoubleBuffer,
makePass
@@ -96,187 +97,9 @@ export default (regl, config) => {
const msdf = loadImage(regl, config.glyphTexURL);
// This shader is the star of the show.
// In normal operation, each pixel represents a glyph's:
// R: brightness
// G: progress through the glyph sequence
// B: current glyph index
// A: additional brightness, for effects
const updateFrag = loadText("../shaders/update.frag");
const update = regl({
frag: `
precision highp float;
#define PI 3.14159265359
#define RADS_TO_HZ 0.15915494309
#define SQRT_2 1.4142135623730951
#define SQRT_5 2.23606797749979
uniform float time;
uniform float numColumns, numRows;
uniform sampler2D lastState;
uniform bool hasSun;
uniform bool hasThunder;
uniform bool showComputationTexture;
uniform float brightnessMinimum, brightnessMultiplier, brightnessOffset, brightnessMix;
uniform float animationSpeed, fallSpeed, cycleSpeed;
uniform float raindropLength;
uniform float glyphHeightToWidth;
uniform int cycleStyle;
uniform float rippleScale, rippleSpeed, rippleThickness;
uniform int rippleType;
uniform float cursorEffectThreshold;
float max2(vec2 v) {
return max(v.x, v.y);
}
highp float rand( const in vec2 uv ) {
const highp float a = 12.9898, b = 78.233, c = 43758.5453;
highp float dt = dot( uv.xy, vec2( a,b ) ), sn = mod( dt, PI );
return fract(sin(sn) * c);
}
vec2 rand2(vec2 p) {
return fract(vec2(sin(p.x * 591.32 + p.y * 154.077), cos(p.x * 391.32 + p.y * 49.077)));
}
float getRainTime(float simTime, vec2 glyphPos) {
float columnTimeOffset = rand(vec2(glyphPos.x, 0.0));
float columnSpeedOffset = rand(vec2(glyphPos.x + 0.1, 0.0));
// columnSpeedOffset = 0.0; // loop
float columnTime = (columnTimeOffset * 1000.0 + simTime * 0.5 * fallSpeed) * (0.5 + columnSpeedOffset * 0.5) + (sin(RADS_TO_HZ * simTime * fallSpeed * columnSpeedOffset) * 0.2);
return (glyphPos.y * 0.01 + columnTime) / raindropLength;
}
float getRainBrightness(float rainTime) {
float value = 1.0 - fract((rainTime + 0.3 * sin(RADS_TO_HZ * SQRT_2 * rainTime) + 0.2 * sin(RADS_TO_HZ * SQRT_5 * rainTime)));
// value = 1.0 - fract(rainTime); // loop
return log(value * 1.25) * 3.0;
}
float getGlyphCycleSpeed(float rainTime, float brightness) {
float glyphCycleSpeed = 0.0;
if (cycleStyle == 0 && brightness > 0.0) {
glyphCycleSpeed = pow(1.0 - brightness, 4.0);
} else if (cycleStyle == 1) {
glyphCycleSpeed = fract((rainTime + 0.7 * sin(RADS_TO_HZ * SQRT_2 * rainTime) + 1.1 * sin(RADS_TO_HZ * SQRT_5 * rainTime))) * 0.75;
// glyphCycleSpeed = fract(rainTime) * 0.75; // loop
}
return glyphCycleSpeed;
}
float applySunShower(float rainBrightness, vec2 screenPos) {
if (rainBrightness < -4.) {
return rainBrightness;
}
float value = pow(fract(rainBrightness * 0.5), 3.0) * screenPos.y * 1.5;
return value;
}
float applyThunder(float rainBrightness, float simTime, vec2 screenPos) {
simTime *= 0.5;
float thunder = 1.0 - fract((simTime + 0.3 * sin(RADS_TO_HZ * SQRT_2 * simTime) + 0.2 * sin(RADS_TO_HZ * SQRT_5 * simTime)));
// thunder = 1.0 - fract(simTime + 0.3); // loop
thunder = log(thunder * 1.5) * 4.0;
thunder = clamp(thunder, 0., 1.);
thunder = thunder * pow(screenPos.y, 2.) * 3.;
return rainBrightness + thunder;
}
float applyRippleEffect(float effect, float simTime, vec2 screenPos) {
if (rippleType == -1) {
return effect;
}
float rippleTime = (simTime * 0.5 + 0.2 * sin(RADS_TO_HZ * simTime)) * rippleSpeed + 1.;
// rippleTime = (simTime * 0.5) * rippleSpeed + 1.; // loop
vec2 offset = rand2(vec2(floor(rippleTime), 0.)) - 0.5;
// offset = vec2(0.); // loop
vec2 ripplePos = screenPos * 2.0 - 1.0 + offset;
float rippleDistance;
if (rippleType == 0) {
rippleDistance = max2(abs(ripplePos) * vec2(1.0, glyphHeightToWidth));
} else if (rippleType == 1) {
rippleDistance = length(ripplePos);
}
float rippleValue = fract(rippleTime) * rippleScale - rippleDistance;
if (rippleValue > 0. && rippleValue < rippleThickness) {
return effect + 0.75;
} else {
return effect;
}
}
float applyCursorEffect(float effect, float brightness) {
if (brightness >= cursorEffectThreshold) {
effect = 1.0;
}
return effect;
}
void main() {
vec2 glyphPos = gl_FragCoord.xy;
vec2 screenPos = glyphPos / vec2(numColumns, numRows);
float simTime = time * animationSpeed;
// Read the current values of the glyph
vec4 data = texture2D( lastState, screenPos );
bool isInitializing = length(data) == 0.;
float oldRainBrightness = data.r;
float oldGlyphCycle = data.g;
if (isInitializing) {
oldGlyphCycle = showComputationTexture ? 0.5 : rand(screenPos);
}
if (oldRainBrightness <= 0.0) {
// oldGlyphCycle = showComputationTexture ? 0.5 : rand(screenPos); // loop
}
float rainTime = getRainTime(simTime, glyphPos);
float rainBrightness = getRainBrightness(rainTime);
if (hasSun) rainBrightness = applySunShower(rainBrightness, screenPos);
if (hasThunder) rainBrightness = applyThunder(rainBrightness, simTime, screenPos);
float glyphCycleSpeed = getGlyphCycleSpeed(rainTime, rainBrightness);
float glyphCycle = fract(oldGlyphCycle + 0.005 * animationSpeed * cycleSpeed * glyphCycleSpeed);
float effect = 0.;
effect = applyRippleEffect(effect, simTime, screenPos);
effect = applyCursorEffect(effect, rainBrightness);
float glyphDepth = rand(vec2(glyphPos.x, 0.0));
if (rainBrightness > brightnessMinimum) {
rainBrightness = rainBrightness * brightnessMultiplier + brightnessOffset;
}
if (!isInitializing) {
rainBrightness = mix(oldRainBrightness, rainBrightness, brightnessMix);
}
if (showComputationTexture) {
gl_FragColor = vec4(
rainBrightness,
glyphCycle,
min(1.0, glyphCycleSpeed), // Better use of the blue channel, for show and tell
1.0
);
} else {
gl_FragColor = vec4(
rainBrightness,
glyphCycle,
glyphDepth,
effect
);
}
}
`,
frag: regl.prop("frag"),
uniforms: {
...uniforms,
lastState: doubleBuffer.back
@@ -294,6 +117,8 @@ export default (regl, config) => {
const quadCorners = Array(numQuads).fill([[0, 0], [0, 1], [1, 1], [0, 0], [1, 1], [1, 0]]);
// We render the code into an FBO using MSDFs: https://github.com/Chlumsky/msdfgen
const renderVert = loadText("../shaders/render.vert");
const renderFrag = loadText("../shaders/render.frag");
const render = regl({
blend: {
enable: true,
@@ -304,152 +129,8 @@ export default (regl, config) => {
dstAlpha: 1
}
},
vert: `
#define PI 3.14159265359
precision lowp float;
attribute vec2 aPosition, aCorner;
uniform sampler2D lastState;
uniform float density;
uniform vec2 quadSize;
uniform float glyphHeightToWidth;
uniform mat4 camera, transform;
uniform vec2 screenSize;
uniform float time, animationSpeed, forwardSpeed;
uniform bool volumetric;
uniform bool showComputationTexture;
uniform float resurrectingCodeRatio;
varying vec2 vUV;
varying vec3 vChannel;
varying vec4 vGlyph;
highp float rand( const in vec2 uv ) {
const highp float a = 12.9898, b = 78.233, c = 43758.5453;
highp float dt = dot( uv.xy, vec2( a,b ) ), sn = mod( dt, PI );
return fract(sin(sn) * c);
}
void main() {
vUV = (aPosition + aCorner) * quadSize;
vGlyph = texture2D(lastState, aPosition * quadSize);
float quadDepth = 0.0;
if (volumetric && !showComputationTexture) {
quadDepth = fract(vGlyph.b + time * animationSpeed * forwardSpeed);
vGlyph.b = quadDepth;
}
vec2 position = (aPosition + aCorner * vec2(density, 1.)) * quadSize;
vec4 pos = vec4((position - 0.5) * 2.0, quadDepth, 1.0);
vChannel = vec3(1.0, 0.0, 0.0);
if (volumetric) {
if (rand(vec2(aPosition.x, 0)) < resurrectingCodeRatio) {
pos.y = -pos.y;
vChannel = vec3(0.0, 1.0, 0.0);
}
pos.x /= glyphHeightToWidth;
pos = camera * transform * pos;
} else {
pos.xy *= screenSize;
}
gl_Position = pos;
}
`,
frag: `
#define PI 3.14159265359
#ifdef GL_OES_standard_derivatives
#extension GL_OES_standard_derivatives: enable
#endif
precision lowp float;
uniform sampler2D lastState;
uniform float numColumns, numRows;
uniform sampler2D glyphTex;
uniform float glyphHeightToWidth, glyphSequenceLength, glyphTextureColumns, glyphEdgeCrop;
uniform vec2 slantVec;
uniform float slantScale;
uniform bool isPolar;
uniform bool showComputationTexture;
uniform bool volumetric;
varying vec2 vUV;
varying vec3 vChannel;
varying vec4 vGlyph;
float median3(vec3 i) {
return max(min(i.r, i.g), min(max(i.r, i.g), i.b));
}
float getSymbolIndex(float glyphCycle) {
float symbol = floor(glyphSequenceLength * glyphCycle);
float symbolX = mod(symbol, glyphTextureColumns);
float symbolY = ((glyphTextureColumns - 1.0) - (symbol - symbolX) / glyphTextureColumns);
return symbolY * glyphTextureColumns + symbolX;
}
void main() {
vec2 uv = vUV;
if (!volumetric) {
if (isPolar) {
// Curves the UV space to make letters appear to radiate from up above
uv -= 0.5;
uv *= 0.5;
uv.y -= 0.5;
float radius = length(uv);
float angle = atan(uv.y, uv.x) / (2. * PI) + 0.5;
uv = vec2(angle * 4. - 0.5, 1.5 - pow(radius, 0.5) * 1.5);
} else {
// Applies the slant, scaling the UV space
// to guarantee the viewport is still covered
uv = vec2(
(uv.x - 0.5) * slantVec.x + (uv.y - 0.5) * slantVec.y,
(uv.y - 0.5) * slantVec.x - (uv.x - 0.5) * slantVec.y
) * slantScale + 0.5;
}
uv.y /= glyphHeightToWidth;
}
vec4 glyph = volumetric ? vGlyph : texture2D(lastState, uv);
if (showComputationTexture) {
gl_FragColor = glyph;
return;
}
// Unpack the values from the font texture
float brightness = glyph.r;
float symbolIndex = getSymbolIndex(glyph.g);
float quadDepth = glyph.b;
float effect = glyph.a;
brightness = max(effect, brightness);
if (volumetric) {
brightness = min(1.0, brightness * quadDepth * 1.25);
}
// resolve UV to MSDF texture coord
vec2 symbolUV = vec2(mod(symbolIndex, glyphTextureColumns), floor(symbolIndex / glyphTextureColumns));
vec2 glyphUV = fract(uv * vec2(numColumns, numRows));
glyphUV -= 0.5;
glyphUV *= clamp(1.0 - glyphEdgeCrop, 0.0, 1.0);
glyphUV += 0.5;
vec2 msdfUV = (glyphUV + symbolUV) / glyphTextureColumns;
// MSDF
vec3 dist = texture2D(glyphTex, msdfUV).rgb;
float sigDist = median3(dist) - 0.5;
float alpha = clamp(sigDist/fwidth(sigDist) + 0.5, 0.0, 1.0);
gl_FragColor = vec4(vChannel * brightness * alpha, 1.0);
}
`,
vert: regl.prop("vert"),
frag: regl.prop("frag"),
uniforms: {
...uniforms,
@@ -487,13 +168,13 @@ export default (regl, config) => {
() => {
const time = Date.now();
update();
update({frag: updateFrag.text()});
regl.clear({
depth: 1,
color: [0, 0, 0, 1],
framebuffer: output
});
render({camera, transform, screenSize});
render({camera, transform, screenSize, vert: renderVert.text(), frag: renderFrag.text()});
},
(w, h) => {
output.resize(w, h);
@@ -501,6 +182,6 @@ export default (regl, config) => {
glMatrix.mat4.perspective(camera, (Math.PI / 180) * 90, aspectRatio, 0.0001, 1000);
[screenSize[0], screenSize[1]] = aspectRatio > 1 ? [1, aspectRatio] : [1 / aspectRatio, 1];
},
msdf.loaded
[msdf.loaded, updateFrag.loaded, renderVert.loaded, renderFrag.loaded]
);
};