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Native mipmap support to FTexture

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This commit is contained in:
Magnus Norddahl 2016-06-21 21:55:08 +02:00
commit c235de5c22
9 changed files with 171 additions and 196 deletions
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68
src/textures/texture.cpp
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@ -200,7 +200,7 @@ const uint32_t *FTexture::GetPixelsBgra()
const BYTE *indices = GetPixels();
if (indices == nullptr)
return nullptr;
PixelsBgra.resize(Width * Height);
CreatePixelsBgraWithMipmaps();
for (int i = 0; i < Width * Height; i++)
{
if (indices[i] != 0)
@ -208,6 +208,7 @@ const uint32_t *FTexture::GetPixelsBgra()
else
PixelsBgra[i] = 0;
}
GenerateBgraMipmaps();
}
return PixelsBgra.data();
}
@ -355,6 +356,71 @@ void FTexture::FreeSpans (Span **spans) const
M_Free (spans);
}
void FTexture::CreatePixelsBgraWithMipmaps()
{
int levels = MipmapLevels();
int buffersize = 0;
for (int i = 0; i < levels; i++)
{
int w = MAX(Width >> i, 1);
int h = MAX(Height >> i, 1);
buffersize += w * h;
}
PixelsBgra.resize(buffersize, 0xffff0000);
}
int FTexture::MipmapLevels() const
{
int widthbits = 0;
while ((Width >> widthbits) != 0) widthbits++;
int heightbits = 0;
while ((Height >> heightbits) != 0) heightbits++;
return MAX(widthbits, heightbits);
}
void FTexture::GenerateBgraMipmaps()
{
uint32_t *src = PixelsBgra.data();
uint32_t *dest = src + Width * Height;
int levels = MipmapLevels();
for (int i = 1; i < levels; i++)
{
int srcw = MAX(Width >> (i - 1), 1);
int srch = MAX(Height >> (i - 1), 1);
int w = MAX(Width >> i, 1);
int h = MAX(Height >> i, 1);
for (int x = 0; x < w; x++)
{
int sx0 = x * 2;
int sx1 = MIN((x + 1) * 2, srcw - 1);
for (int y = 0; y < h; y++)
{
int sy0 = y * 2;
int sy1 = MIN((y + 1) * 2, srch - 1);
uint32_t src00 = src[sy0 + sx0 * srch];
uint32_t src01 = src[sy1 + sx0 * srch];
uint32_t src10 = src[sy0 + sx1 * srch];
uint32_t src11 = src[sy1 + sx1 * srch];
uint32_t alpha = (APART(src00) + APART(src01) + APART(src10) + APART(src11) + 2) / 4;
uint32_t red = (RPART(src00) + RPART(src01) + RPART(src10) + RPART(src11) + 2) / 4;
uint32_t green = (GPART(src00) + GPART(src01) + GPART(src10) + GPART(src11) + 2) / 4;
uint32_t blue = (BPART(src00) + BPART(src01) + BPART(src10) + BPART(src11) + 2) / 4;
dest[y + x * h] = (alpha << 24) | (red << 16) | (green << 8) | blue;
}
}
src = dest;
dest += w * h;
}
}
void FTexture::CopyToBlock (BYTE *dest, int dwidth, int dheight, int xpos, int ypos, int rotate, const BYTE *translation)
{
const BYTE *pixels = GetPixels();