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fixed 16 bit/channel problem in blend_modulate()

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This commit is contained in:
Brian Paul
2002-04-04 16:53:26 +00:00
parent 543381510d
commit d5c94ef40d
1 changed files with 14 additions and 5 deletions
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src/mesa/swrast/s_blend.c
+14 -5
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@@ -1,4 +1,4 @@
/* $Id: s_blend.c,v 1.17 2002/04/04 01:40:18 brianp Exp $ */
/* $Id: s_blend.c,v 1.18 2002/04/04 16:53:26 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -274,11 +274,20 @@ blend_modulate( GLcontext *ctx, GLuint n, const GLubyte mask[],
rgba[i][GCOMP] = rgba[i][GCOMP] * dest[i][GCOMP];
rgba[i][BCOMP] = rgba[i][BCOMP] * dest[i][BCOMP];
rgba[i][ACOMP] = rgba[i][ACOMP] * dest[i][ACOMP];
#elif CHAN_TYPE == GL_UNSIGNED_SHORT
GLint r = (rgba[i][RCOMP] * dest[i][RCOMP] + 65535) >> 16;
GLint g = (rgba[i][GCOMP] * dest[i][GCOMP] + 65535) >> 16;
GLint b = (rgba[i][BCOMP] * dest[i][BCOMP] + 65535) >> 16;
GLint a = (rgba[i][ACOMP] * dest[i][ACOMP] + 65535) >> 16;
rgba[i][RCOMP] = (GLchan) r;
rgba[i][GCOMP] = (GLchan) g;
rgba[i][BCOMP] = (GLchan) b;
rgba[i][ACOMP] = (GLchan) a;
#else
GLint r = (rgba[i][RCOMP] * dest[i][RCOMP]) >> 8;
GLint g = (rgba[i][GCOMP] * dest[i][GCOMP]) >> 8;
GLint b = (rgba[i][BCOMP] * dest[i][BCOMP]) >> 8;
GLint a = (rgba[i][ACOMP] * dest[i][ACOMP]) >> 8;
GLint r = (rgba[i][RCOMP] * dest[i][RCOMP] + 255) >> 8;
GLint g = (rgba[i][GCOMP] * dest[i][GCOMP] + 255) >> 8;
GLint b = (rgba[i][BCOMP] * dest[i][BCOMP] + 255) >> 8;
GLint a = (rgba[i][ACOMP] * dest[i][ACOMP] + 255) >> 8;
rgba[i][RCOMP] = (GLchan) r;
rgba[i][GCOMP] = (GLchan) g;
rgba[i][BCOMP] = (GLchan) b;