diff options
Diffstat (limited to 'src/mesa/swrast')
| -rw-r--r-- | src/mesa/swrast/s_span.c | 38 |
1 files changed, 32 insertions, 6 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c index a8cc268a950..2fc014ef68f 100644 --- a/src/mesa/swrast/s_span.c +++ b/src/mesa/swrast/s_span.c @@ -1218,6 +1218,37 @@ add_specular(GLcontext *ctx, SWspan *span) /** + * Apply antialiasing coverage value to alpha values. + */ +static void +apply_aa_coverage(SWspan *span) +{ + const GLfloat *coverage = span->array->coverage; + GLuint i; + if (span->array->ChanType == GL_UNSIGNED_BYTE) { + GLubyte (*rgba)[4] = span->array->color.sz1.rgba; + for (i = 0; i < span->end; i++) { + ASSERT(coverage[i] >= 0.0); + ASSERT(coverage[i] <= 1.0); + UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][ACOMP], rgba[i][ACOMP] * coverage[i]); + } + } + else if (span->array->ChanType == GL_UNSIGNED_SHORT) { + GLushort (*rgba)[4] = span->array->color.sz2.rgba; + for (i = 0; i < span->end; i++) { + UNCLAMPED_FLOAT_TO_USHORT(rgba[i][ACOMP], rgba[i][ACOMP] * coverage[i]); + } + } + else { + GLfloat (*rgba)[4] = span->array->color.sz4.rgba; + for (i = 0; i < span->end; i++) { + rgba[i][ACOMP] = rgba[i][ACOMP] * coverage[i]; + } + } +} + + +/** * Convert the span's color arrays to the given type. * XXX this could be put into image.c and reused in several places. */ @@ -1476,12 +1507,7 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span) /* Antialias coverage application */ if (span->arrayMask & SPAN_COVERAGE) { - GLchan (*rgba)[4] = span->array->rgba; - GLfloat *coverage = span->array->coverage; - GLuint i; - for (i = 0; i < span->end; i++) { - rgba[i][ACOMP] = (GLchan) (rgba[i][ACOMP] * coverage[i]); - } + apply_aa_coverage(span); } /* Clamp color/alpha values over the range [0.0, 1.0] before storage */ |