drewcassidy/nvidia-texture-tools
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Implement alpha premultiplication and color blending.

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This commit is contained in:
castano 2009-03-16 08:54:43 +00:00
parent 0abec17ab4
commit c59a2e0a4b
2 changed files with 32 additions and 6 deletions
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34
src/nvtt/Texture.cpp
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@ -590,15 +590,26 @@ void TexImage::scaleBias(int channel, float scale, float bias)
}
}
void TexImage::blend(float r, float g, float b, float a)
void TexImage::blend(float red, float green, float blue, float alpha)
{
detach();
foreach(i, m->imageArray)
{
if (m->imageArray[i] == NULL) continue;
FloatImage * img = m->imageArray[i];
if (img == NULL) continue;
// @@ Not implemented.
float * restrict r = img->channel(0);
float * restrict g = img->channel(0);
float * restrict b = img->channel(0);
const int count = img->width() * img->height();
for (int i = 0; i < count; i++)
{
r[i] = lerp(r[i], red, alpha);
g[i] = lerp(g[i], green, alpha);
b[i] = lerp(b[i], blue, alpha);
}
}
}
@ -608,9 +619,21 @@ void TexImage::premultiplyAlpha()
foreach(i, m->imageArray)
{
if (m->imageArray[i] == NULL) continue;
FloatImage * img = m->imageArray[i];
if (img == NULL) continue;
// @@ Not implemented.
float * restrict r = img->channel(0);
float * restrict g = img->channel(0);
float * restrict b = img->channel(0);
float * restrict a = img->channel(0);
const int count = img->width() * img->height();
for (int i = 0; i < count; i++)
{
r[i] *= a[i];
g[i] *= a[i];
b[i] *= a[i];
}
}
}
@ -636,7 +659,6 @@ void TexImage::toGreyScale(float redScale, float greenScale, float blueScale, fl
float * restrict a = img->channel(0);
const int count = img->width() * img->height();
for (int i = 0; i < count; i++)
{
float grey = r[i] * redScale + g[i] * greenScale + b[i] * blueScale + a[i] * alphaScale;

4
src/nvtt/Texture.h
View File

@ -56,6 +56,10 @@ namespace nvtt
imageArray = p.imageArray;
}
~Private()
{
// @@ Free images.
}
TextureType type;
WrapMode wrapMode;