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- Fixed: All translucent blending operations for CopyColors must treat an

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alpha of 0 so that the pixel is not modified or texture composition as 
  intended will not work.


SVN r977 (trunk)
This commit is contained in:
Christoph Oelckers 2008-05-17 08:18:31 +00:00
parent 32557c4a28
commit 9fcb85d3e9
2 changed files with 11 additions and 6 deletions
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5
docs/rh-log.txt
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@ -1,3 +1,8 @@
May 17, 2008 (Changes by Graf Zahl)
- Fixed: All translucent blending operations for CopyColors must treat an
alpha of 0 so that the pixel is not modified or texture composition as
intended will not work.
May 16, 2008
- Fixed: 3D hardware texture filling did not copy pixels with 0 alpha,
preserving whatever was underneath in the texture box previously.

12
src/textures/bitmap.h
View file

@ -312,42 +312,42 @@ struct bBlend
{
static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = (d*i->invalpha + s*i->alpha) >> FRACBITS; }
static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
static __forceinline bool ProcessAlpha0() { return true; }
static __forceinline bool ProcessAlpha0() { return false; }
};
struct bAdd
{
static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = MIN<int>((d*FRACUNIT + s*i->alpha) >> FRACBITS, 255); }
static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
static __forceinline bool ProcessAlpha0() { return true; }
static __forceinline bool ProcessAlpha0() { return false; }
};
struct bSubtract
{
static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = MAX<int>((d*FRACUNIT - s*i->alpha) >> FRACBITS, 0); }
static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
static __forceinline bool ProcessAlpha0() { return true; }
static __forceinline bool ProcessAlpha0() { return false; }
};
struct bReverseSubtract
{
static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = MAX<int>((-d*FRACUNIT + s*i->alpha) >> FRACBITS, 0); }
static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
static __forceinline bool ProcessAlpha0() { return true; }
static __forceinline bool ProcessAlpha0() { return false; }
};
struct bModulate
{
static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = (s*d)/255; }
static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
static __forceinline bool ProcessAlpha0() { return true; }
static __forceinline bool ProcessAlpha0() { return false; }
};
struct bCopyAlpha
{
static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = (s*a + d*(255-a))/255; }
static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
static __forceinline bool ProcessAlpha0() { return true; }
static __forceinline bool ProcessAlpha0() { return false; }
};