ellipsoid/QuaternionEngine
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ADD: Docs and shader optim

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hydrogendeuteride
2025-12-25 22:09:02 +09:00
parent 0172996e12
commit d6216b20fc
16 changed files with 1178 additions and 60 deletions
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57
shaders/tonemap.frag
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@@ -31,36 +31,50 @@ vec3 aces_tonemap(vec3 x)
return clamp((x*(a*x+b))/(x*(c*x+d)+e), 0.0, 1.0);
}
void accum_bloom(vec3 c, float kernel_weight, inout vec3 bloom, inout float weight_sum)
{
float bright = max(max(c.r, c.g), c.b) - pc.bloomThreshold;
bright = max(bright, 0.0);
// Match the old behavior: only normalize over samples that pass the threshold.
float contribute = step(1e-5, bright);
bloom += c * bright * kernel_weight;
weight_sum += kernel_weight * contribute;
}
void main()
{
vec3 hdr = texture(uHdr, inUV).rgb;
// Simple bloom in HDR space: gather bright neighbors and add a small blurred contribution.
if (pc.bloomEnabled != 0)
// Simple bloom in HDR space: approximate a 5x5 Gaussian blur using 9 bilinear samples (vs. 25 taps).
if (pc.bloomEnabled != 0 && pc.bloomIntensity > 0.0)
{
vec2 texel = 1.0 / vec2(textureSize(uHdr, 0));
vec2 d = texel * 1.2; // Combines 1- and 2-texel taps via linear filtering (4:1 weight).
vec3 bloom = vec3(0.0);
int radius = 2;
int count = 0;
for (int x = -radius; x <= radius; ++x)
float wsum = 0.0;
// 1D weights [1 4 6 4 1] collapsed to 3 linear samples => weights [5 6 5]
// 2D separable => center 36, axis 30, corners 25 (sum 256).
accum_bloom(hdr, 36.0, bloom, wsum); // reuse center sample
accum_bloom(texture(uHdr, clamp(inUV + vec2( d.x, 0.0), vec2(0.0), vec2(1.0))).rgb, 30.0, bloom, wsum);
accum_bloom(texture(uHdr, clamp(inUV + vec2(-d.x, 0.0), vec2(0.0), vec2(1.0))).rgb, 30.0, bloom, wsum);
accum_bloom(texture(uHdr, clamp(inUV + vec2(0.0, d.y), vec2(0.0), vec2(1.0))).rgb, 30.0, bloom, wsum);
accum_bloom(texture(uHdr, clamp(inUV + vec2(0.0, -d.y), vec2(0.0), vec2(1.0))).rgb, 30.0, bloom, wsum);
accum_bloom(texture(uHdr, clamp(inUV + vec2( d.x, d.y), vec2(0.0), vec2(1.0))).rgb, 25.0, bloom, wsum);
accum_bloom(texture(uHdr, clamp(inUV + vec2(-d.x, d.y), vec2(0.0), vec2(1.0))).rgb, 25.0, bloom, wsum);
accum_bloom(texture(uHdr, clamp(inUV + vec2( d.x, -d.y), vec2(0.0), vec2(1.0))).rgb, 25.0, bloom, wsum);
accum_bloom(texture(uHdr, clamp(inUV + vec2(-d.x, -d.y), vec2(0.0), vec2(1.0))).rgb, 25.0, bloom, wsum);
if (wsum > 0.0)
{
for (int y = -radius; y <= radius; ++y)
{
vec2 offset = vec2(x, y) * texel;
vec3 c = texture(uHdr, clamp(inUV + offset, vec2(0.0), vec2(1.0))).rgb;
float bright = max(max(c.r, c.g), c.b) - pc.bloomThreshold;
if (bright > 0.0)
{
bloom += c * bright;
count++;
}
}
bloom /= wsum;
hdr += pc.bloomIntensity * bloom;
}
if (count > 0)
{
bloom /= float(count);
}
hdr += pc.bloomIntensity * bloom;
}
// Simple exposure
@@ -77,4 +91,3 @@ void main()
outColor = vec4(mapped, 1.0);
}