castano
17 years ago
parent
da3a43ba2e
commit
0008199435
@ -0,0 +1,177 @@
|
||||
// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person
|
||||
// obtaining a copy of this software and associated documentation
|
||||
// files (the "Software"), to deal in the Software without
|
||||
// restriction, including without limitation the rights to use,
|
||||
// copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the
|
||||
// Software is furnished to do so, subject to the following
|
||||
// conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be
|
||||
// included in all copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
||||
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
||||
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
||||
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||||
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
||||
// OTHER DEALINGS IN THE SOFTWARE.
|
||||
|
||||
#include <nvmath/Color.h>
|
||||
#include <nvimage/ColorBlock.h>
|
||||
#include <nvimage/BlockDXT.h>
|
||||
#include "QuickCompressDXT.h"
|
||||
|
||||
using namespace nv;
|
||||
using namespace QuickCompress;
|
||||
|
||||
|
||||
inline static Vector3 loadColor(Color32 c)
|
||||
{
|
||||
return Vector3(c.r, c.g, c.b);
|
||||
}
|
||||
|
||||
inline static void extractColorBlockRGB(const ColorBlock & rgba, Vector3 block[16])
|
||||
{
|
||||
for (int i = 0; i < 16; i++)
|
||||
{
|
||||
block[i] = loadColor(rgba.color(i));
|
||||
}
|
||||
}
|
||||
|
||||
// find minimum and maximum colors based on bounding box in color space
|
||||
inline static void findMinMaxColorsBox(Vector3 block[16], Vector3 * __restrict maxColor, Vector3 * __restrict minColor)
|
||||
{
|
||||
*maxColor = Vector3(0, 0, 0);
|
||||
*minColor = Vector3(1, 1, 1);
|
||||
|
||||
for (int i = 0; i < 16; i++)
|
||||
{
|
||||
*maxColor = max(*maxColor, block[i]);
|
||||
*minColor = min(*minColor, block[i]);
|
||||
}
|
||||
}
|
||||
|
||||
inline static void selectDiagonal(Vector3 block[16], Vector3 * __restrict maxColor, Vector3 * __restrict minColor)
|
||||
{
|
||||
Vector3 center = (*maxColor + *minColor) * 0.5;
|
||||
|
||||
Vector2 covariance = Vector2(zero);
|
||||
for (int i = 0; i < 16; i++)
|
||||
{
|
||||
Vector3 t = block[i] - center;
|
||||
covariance += t.xy() * t.z();
|
||||
}
|
||||
|
||||
float x0 = maxColor->x();
|
||||
float y0 = maxColor->y();
|
||||
float x1 = minColor->x();
|
||||
float y1 = minColor->y();
|
||||
|
||||
if (covariance.x() < 0) {
|
||||
swap(x0, x1);
|
||||
}
|
||||
if (covariance.y() < 0) {
|
||||
swap(y0, y1);
|
||||
}
|
||||
|
||||
maxColor->set(x0, y0, maxColor->z());
|
||||
minColor->set(x1, y1, minColor->z());
|
||||
}
|
||||
|
||||
inline static void insetBBox(Vector3 * __restrict maxColor, Vector3 * __restrict minColor)
|
||||
{
|
||||
Vector3 inset = (*maxColor - *minColor) / 16.0f - (8.0f / 255.0f) / 16.0f;
|
||||
*maxColor = clamp(*maxColor - inset, 0.0f, 255.0f);
|
||||
*minColor = clamp(*minColor + inset, 0.0f, 255.0f);
|
||||
}
|
||||
|
||||
inline static uint16 roundAndExpand(Vector3 * v)
|
||||
{
|
||||
uint r = clamp(v->x() * (31.0f / 255.0f), 0.0f, 31.0f);
|
||||
uint g = clamp(v->y() * (63.0f / 255.0f), 0.0f, 63.0f);
|
||||
uint b = clamp(v->z() * (31.0f / 255.0f), 0.0f, 31.0f);
|
||||
|
||||
uint16 w = (r << 11) | (g << 5) | b;
|
||||
|
||||
r = (r << 3) | (r >> 2);
|
||||
g = (g << 2) | (g >> 4);
|
||||
b = (b << 3) | (b >> 2);
|
||||
*v = Vector3(r, g, b);
|
||||
|
||||
return w;
|
||||
}
|
||||
|
||||
inline static float colorDistance(Vector3::Arg c0, Vector3::Arg c1)
|
||||
{
|
||||
return dot(c0-c1, c0-c1);
|
||||
}
|
||||
|
||||
inline static uint computeIndices(Vector3 block[16], Vector3::Arg maxColor, Vector3::Arg minColor)
|
||||
{
|
||||
Vector3 c[4];
|
||||
c[0] = maxColor;
|
||||
c[1] = minColor;
|
||||
c[2] = lerp(c[0], c[1], 1.0/3.0);
|
||||
c[3] = lerp(c[0], c[1], 2.0/3.0);
|
||||
|
||||
uint indices = 0;
|
||||
for(int i = 0; i < 16; i++)
|
||||
{
|
||||
float d0 = colorDistance(c[0], block[i]);
|
||||
float d1 = colorDistance(c[1], block[i]);
|
||||
float d2 = colorDistance(c[2], block[i]);
|
||||
float d3 = colorDistance(c[3], block[i]);
|
||||
|
||||
uint b0 = d0 > d3;
|
||||
uint b1 = d1 > d2;
|
||||
uint b2 = d0 > d2;
|
||||
uint b3 = d1 > d3;
|
||||
uint b4 = d2 > d3;
|
||||
|
||||
uint x0 = b1 & b2;
|
||||
uint x1 = b0 & b3;
|
||||
uint x2 = b0 & b4;
|
||||
|
||||
indices |= (x2 | ((x0 | x1) << 1)) << (2 * i);
|
||||
}
|
||||
|
||||
return indices;
|
||||
}
|
||||
|
||||
|
||||
void QuickCompress::compressDXT1(const ColorBlock & rgba, BlockDXT1 * dxtBlock)
|
||||
{
|
||||
// read block
|
||||
Vector3 block[16];
|
||||
extractColorBlockRGB(rgba, block);
|
||||
|
||||
// find min and max colors
|
||||
Vector3 maxColor, minColor;
|
||||
findMinMaxColorsBox(block, &maxColor, &minColor);
|
||||
|
||||
//selectDiagonal(block, &maxColor, &minColor);
|
||||
|
||||
//insetBBox(&minColor, &maxColor);
|
||||
|
||||
uint16 color0 = roundAndExpand(&maxColor);
|
||||
uint16 color1 = roundAndExpand(&minColor);
|
||||
|
||||
/*if (color0 < color1)
|
||||
{
|
||||
swap(maxColor, minColor);
|
||||
swap(color0, color1);
|
||||
}*/
|
||||
|
||||
// @@ Optimize endpoints.
|
||||
|
||||
dxtBlock->col0 = Color16(color0);
|
||||
dxtBlock->col1 = Color16(color1);
|
||||
dxtBlock->indices = computeIndices(block, maxColor, minColor);
|
||||
}
|
||||
|
||||
|
||||
@ -0,0 +1,40 @@
|
||||
// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person
|
||||
// obtaining a copy of this software and associated documentation
|
||||
// files (the "Software"), to deal in the Software without
|
||||
// restriction, including without limitation the rights to use,
|
||||
// copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the
|
||||
// Software is furnished to do so, subject to the following
|
||||
// conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be
|
||||
// included in all copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
||||
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
||||
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
||||
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||||
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
||||
// OTHER DEALINGS IN THE SOFTWARE.
|
||||
|
||||
#ifndef NV_TT_QUICKCOMPRESSDXT_H
|
||||
#define NV_TT_QUICKCOMPRESSDXT_H
|
||||
|
||||
#include <nvimage/nvimage.h>
|
||||
|
||||
namespace nv
|
||||
{
|
||||
struct ColorBlock;
|
||||
struct BlockDXT1;
|
||||
|
||||
namespace QuickCompress
|
||||
{
|
||||
void compressDXT1(const ColorBlock & rgba, BlockDXT1 * block);
|
||||
}
|
||||
} // nv namespace
|
||||
|
||||
#endif // NV_TT_QUICKCOMPRESSDXT_H
|
||||
Loading…
Reference in New Issue