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fixes related to interpolation of palettes; hsv interpolation now goes

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the 'short way' around the hue circle, and the correct palette is now
chosen when > 2 palettes are present in the knots.
This commit is contained in:
erik
2011-11-14 19:12:41 -07:00
parent 0f848b8bb8
commit efd261bd5b
2 changed files with 16 additions and 4 deletions
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14
cuburn/code/interp.py
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@ -318,7 +318,7 @@ __global__
void interp_palette_hsv(uchar4 *outs, const float *times, const float4 *sources,
float tstart, float tstep) {
float time = tstart + blockIdx.x * tstep;
int idx = fmaxf(bitwise_binsearch(times, time), 1);
int idx = fmaxf(bitwise_binsearch(times, time) + 1, 1);
float4 left = sources[blockDim.x * (idx - 1) + threadIdx.x];
float4 right = sources[blockDim.x * (idx) + threadIdx.x];
@ -329,10 +329,22 @@ void interp_palette_hsv(uchar4 *outs, const float *times, const float4 *sources,
float3 lhsv = rgb2hsv(make_float3(left.x, left.y, left.z));
float3 rhsv = rgb2hsv(make_float3(right.x, right.y, right.z));
if (fabs(lhsv.x - rhsv.x) > 3.0f)
if (lhsv.x < rhsv.x)
lhsv.x += 6.0f;
else
rhsv.x += 6.0f;
float3 hsv;
hsv.x = lhsv.x * lf + rhsv.x * rf;
hsv.y = lhsv.y * lf + rhsv.y * rf;
hsv.z = lhsv.z * lf + rhsv.z * rf;
if (hsv.x > 6.0f)
hsv.x -= 6.0f;
if (hsv.x < 0.0f)
hsv.x += 6.0f;
float3 rgb = hsv2rgb(hsv);
uchar4 out;

6
cuburn/code/util.py
View File

@ -154,7 +154,7 @@ float3 rgb2hsv(float3 rgb) {
float s = M > 0.0f ? C / M : 0.0f;
float h;
float h = 0.0f;
if (s != 0.0f) {
C = 1.0f / C;
float rc = (M - rgb.x) * C;
@ -164,8 +164,8 @@ float3 rgb2hsv(float3 rgb) {
if (rgb.x == M) h = bc - gc;
else if (rgb.y == M) h = 2 + rc - bc;
else h = 4 + gc - rc;
if (h < 0) h += 6;
if (h < 0) h += 6.0f;
}
return make_float3(h, s, M);
}