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SWORD25: Another attempt to implement alpha blending. Looks a bit better.

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svn-id: r53275
This commit is contained in:
Eugene Sandulenko 2010-08-21 21:44:44 +00:00
parent e9d6fa094e
commit 4d11cf941e
1 changed files with 17 additions and 14 deletions
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31
engines/sword25/gfx/opengl/glimage.cpp
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@ -214,26 +214,29 @@ bool GLImage::Blit(int PosX, int PosY, int Flipping, Common::Rect *pPartRect, un
out = outo;
in = ino;
for (int j = 0; j < w; j++) {
switch (*in) {
int r = *in++;
int g = *in++;
int b = *in++;
int a = *in++;
switch (a) {
case 0: // Full transparency
in += 4;
out += 4;
break;
case 255: // Full opacity
default:
*out++ = *in++;
*out++ = *in++;
*out++ = *in++;
*out++ = *in++;
*out++ = r;
*out++ = g;
*out++ = b;
*out++ = a;
break;
#if 0
default: // alpha blending
*out++ = 255;
int alpha = *in++;
for (int c = 0; c < 3; c++, out++, in++) {
*out = (byte)((int)(*out - *in) * alpha + *in);
}
#endif
*out = (byte)((((int)(*out - r) * a + r) >> 8) & 0xff);
out++;
*out = (byte)((((int)(*out - g) * a + g) >> 8) & 0xff);
out++;
*out = (byte)((((int)(*out - b) * a + b) >> 8) & 0xff);
out++;
*out = 255;
out++;
}
}
outo += _backSurface->pitch;