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Precompute fast cluster fit factors, and store as static const.

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nvtt is completely reentrant now. Fixes issue 37.
cleanup interface of cuda compressors.
This commit is contained in:
castano
2008-04-18 08:49:32 +00:00
parent 91eb30667f
commit 1df69495fc
8 changed files with 1296 additions and 316 deletions
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87
src/nvtt/squish/fastclusterfit.cpp
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@ -29,6 +29,8 @@
#include "colourblock.h"
#include <cfloat>
#include "fastclusterlookup.inl"
namespace squish {
FastClusterFit::FastClusterFit()
@ -97,91 +99,6 @@ void FastClusterFit::SetColourSet( ColourSet const* colours, int flags )
}
struct Precomp {
float alpha2_sum;
float beta2_sum;
float alphabeta_sum;
float factor;
};
static SQUISH_ALIGN_16 Precomp s_threeElement[153];
static SQUISH_ALIGN_16 Precomp s_fourElement[969];
void FastClusterFit::DoPrecomputation()
{
int i = 0;
// Three element clusters:
for( int c0 = 0; c0 <= 16; c0++) // At least two clusters.
{
for( int c1 = 0; c1 <= 16-c0; c1++)
{
int c2 = 16 - c0 - c1;
/*if (c2 == 16) {
// a = b = x2 / 16
s_threeElement[i].alpha2_sum = 0;
s_threeElement[i].beta2_sum = 16;
s_threeElement[i].alphabeta_sum = -16;
s_threeElement[i].factor = 1.0f / 256.0f;
}
else if (c0 == 16) {
// a = b = x0 / 16
s_threeElement[i].alpha2_sum = 16;
s_threeElement[i].beta2_sum = 0;
s_threeElement[i].alphabeta_sum = -16;
s_threeElement[i].factor = 1.0f / 256.0f;
}
else*/ {
s_threeElement[i].alpha2_sum = c0 + c1 * 0.25f;
s_threeElement[i].beta2_sum = c2 + c1 * 0.25f;
s_threeElement[i].alphabeta_sum = c1 * 0.25f;
s_threeElement[i].factor = 1.0f / (s_threeElement[i].alpha2_sum * s_threeElement[i].beta2_sum - s_threeElement[i].alphabeta_sum * s_threeElement[i].alphabeta_sum);
}
i++;
}
}
//printf("%d three cluster elements\n", i);
// Four element clusters:
i = 0;
for( int c0 = 0; c0 <= 16; c0++)
{
for( int c1 = 0; c1 <= 16-c0; c1++)
{
for( int c2 = 0; c2 <= 16-c0-c1; c2++)
{
int c3 = 16 - c0 - c1 - c2;
/*if (c3 == 16) {
// a = b = x3 / 16
s_fourElement[i].alpha2_sum = 16.0f;
s_fourElement[i].beta2_sum = 0.0f;
s_fourElement[i].alphabeta_sum = -16.0f;
s_fourElement[i].factor = 1.0f / 256.0f;
}
else if (c0 == 16) {
// a = b = x0 / 16
s_fourElement[i].alpha2_sum = 0.0f;
s_fourElement[i].beta2_sum = 16.0f;
s_fourElement[i].alphabeta_sum = -16.0f;
s_fourElement[i].factor = 1.0f / 256.0f;
}
else*/ {
s_fourElement[i].alpha2_sum = c0 + c1 * (4.0f/9.0f) + c2 * (1.0f/9.0f);
s_fourElement[i].beta2_sum = c3 + c2 * (4.0f/9.0f) + c1 * (1.0f/9.0f);
s_fourElement[i].alphabeta_sum = (c1 + c2) * (2.0f/9.0f);
s_fourElement[i].factor = 1.0f / (s_fourElement[i].alpha2_sum * s_fourElement[i].beta2_sum - s_fourElement[i].alphabeta_sum * s_fourElement[i].alphabeta_sum);
}
i++;
}
}
}
//printf("%d four cluster elements\n", i);
}
void FastClusterFit::SetMetric(float r, float g, float b)
{
#if SQUISH_USE_SIMD