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Added some documentation, cleaned up some code, fleshed out the remaining work to make the project a little easier for newcomers to approach

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Rezmason
2021-10-20 21:01:32 -07:00
parent b4bece1264
commit 4c6ff879fd
12 changed files with 156 additions and 100 deletions
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32
shaders/rain.frag
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@@ -33,9 +33,10 @@ void main() {
vec2 uv = vUV;
// In normal mode, derives the current glyph and UV from vUV
if (!volumetric) {
if (isPolar) {
// Curves the UV space to make letters appear to radiate from up above
// Curved space that makes letters appear to radiate from up above
uv -= 0.5;
uv *= 0.5;
uv.y -= 0.5;
@@ -43,35 +44,29 @@ void main() {
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
// Applies the slant and scales space so the viewport is fully 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
(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;
}
// Unpack the values from the data texture
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);
// In volumetric mode, distant glyphs are dimmer
if (volumetric) {
brightness = min(1.0, brightness * quadDepth * 1.25);
brightness = brightness * min(1.0, quadDepth);
}
// resolve UV to MSDF texture coord
// resolve UV to position of glyph in MSDF texture
vec2 symbolUV = vec2(mod(symbolIndex, glyphTextureColumns), floor(symbolIndex / glyphTextureColumns));
vec2 glyphUV = fract(uv * vec2(numColumns, numRows));
glyphUV -= 0.5;
@@ -79,10 +74,15 @@ void main() {
glyphUV += 0.5;
vec2 msdfUV = (glyphUV + symbolUV) / glyphTextureColumns;
// MSDF
// MSDF: calculate brightness of fragment based on distance to shape
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);
if (showComputationTexture) {
gl_FragColor = vec4(glyph.rgb * alpha, 1.0);
} else {
gl_FragColor = vec4(vChannel * brightness * alpha, 1.0);
}
}