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Fix RS mipmap generation for 8 bit alpha textures.

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This commit is contained in:
Jason Sams
2010-01-19 17:53:54 -08:00
parent fc35343cfe
commit e20e3b41db
1 changed files with 22 additions and 0 deletions
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22
libs/rs/rsAllocation.cpp
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@@ -366,6 +366,25 @@ static void mip8888(const Adapter2D &out, const Adapter2D &in)
}
}
static void mip8(const Adapter2D &out, const Adapter2D &in)
{
uint32_t w = out.getDimX();
uint32_t h = out.getDimY();
for (uint32_t y=0; y < h; y++) {
uint8_t *oPtr = static_cast<uint8_t *>(out.getElement(0, y));
const uint8_t *i1 = static_cast<uint8_t *>(in.getElement(0, y*2));
const uint8_t *i2 = static_cast<uint8_t *>(in.getElement(0, y*2+1));
for (uint32_t x=0; x < w; x++) {
*oPtr = (uint8_t)(((uint32_t)i1[0] + i1[1] + i2[0] + i2[1]) * 0.25f);
oPtr ++;
i1 += 2;
i2 += 2;
}
}
}
static void mip(const Adapter2D &out, const Adapter2D &in)
{
switch(out.getBaseType()->getElement()->getSizeBits()) {
@@ -375,6 +394,9 @@ static void mip(const Adapter2D &out, const Adapter2D &in)
case 16:
mip565(out, in);
break;
case 8:
mip8(out, in);
break;
}