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apply_aa_coverage() for ubyte/ushort/float

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This commit is contained in:
Brian Paul
2006-10-17 20:22:53 +00:00
parent 0c6c8d5f1c
commit b88af5b468
1 changed files with 32 additions and 6 deletions
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src/mesa/swrast/s_span.c
+32 -6
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@@ -1217,6 +1217,37 @@ 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 */