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[util] Add vector swizzles to cexpr

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That turned out to be a lot easier than expected: needed only 4 ifs per
vector "type" (xyzw vs rgba) instead of 340.
This commit is contained in:
Bill Currie 2021-01-04 00:15:22 +09:00
parent 4562e0b876
commit 619fe15367
1 changed files with 73 additions and 0 deletions
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73
libs/util/cexpr-type.c
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@ -391,6 +391,78 @@ vector_mod (const exprval_t *val1, const exprval_t *val2, exprval_t *result,
*c = a - b * vfloorf (a / b);
}
static void
vector_swizzle (const exprval_t *val1, const exprval_t *val2,
exprval_t *result, exprctx_t *ctx)
{
#define m(x) (1 << ((x) - 'a'))
#define v(x, mask) (((x) & 0x60) == 0x60 && (m(x) & (mask)))
#define vind(x) ((x) & 3)
#define cind(x) (-(((x) >> 3) ^ (x)) & 3)
const int color = m('r') | m('g') | m('b') | m('a');
const int vector = m('x') | m('y') | m('z') | m('w');
float *vec = val1->value;
const char *name = val2->value;
exprval_t *val = 0;
if (v (name[0], vector) && v (name[1], vector)
&& v (name[2], vector) && v (name[3], vector) && !name[4]) {
val = cexpr_value (&cexpr_vector, ctx);
float *res = val->value;
res[0] = vec[vind (name[0])];
res[1] = vec[vind (name[1])];
res[2] = vec[vind (name[2])];
res[3] = vec[vind (name[3])];
} else if (v (name[0], color) && v (name[1], color)
&& v (name[2], color) && v (name[3], color) && !name[4]) {
val = cexpr_value (&cexpr_vector, ctx);
float *res = val->value;
res[0] = vec[cind (name[0])];
res[1] = vec[cind (name[1])];
res[2] = vec[cind (name[2])];
res[3] = vec[cind (name[3])];
} else if (v (name[0], vector) && v (name[1], vector)
&& v (name[2], vector) && !name[3]) {
val = cexpr_value (&cexpr_vector, ctx);
float *res = val->value;
res[0] = vec[vind (name[0])];
res[1] = vec[vind (name[1])];
res[2] = vec[vind (name[2])];
res[3] = 0;
} else if (v (name[0], color) && v (name[1], color)
&& v (name[2], color) && !name[3]) {
val = cexpr_value (&cexpr_vector, ctx);
float *res = val->value;
res[0] = vec[cind (name[0])];
res[1] = vec[cind (name[1])];
res[2] = vec[cind (name[2])];
res[3] = 0;
} else if (v (name[0], vector) && v (name[1], vector) && !name[2]) {
val = cexpr_value (&cexpr_vector, ctx);
float *res = val->value;
res[0] = vec[vind (name[0])];
res[1] = vec[vind (name[1])];
res[2] = 0;
res[3] = 0;
} else if (v (name[0], color) && v (name[1], color) && !name[2]) {
val = cexpr_value (&cexpr_vector, ctx);
float *res = val->value;
res[0] = vec[cind (name[0])];
res[1] = vec[cind (name[1])];
res[2] = 0;
res[3] = 0;
} else if (v (name[0], vector) && !name[1]) {
val = cexpr_value (&cexpr_float, ctx);
float *res = val->value;
res[0] = vec[vind (name[0])];
} else if (v (name[0], color) && !name[1]) {
val = cexpr_value (&cexpr_float, ctx);
float *res = val->value;
res[0] = vec[cind (name[0])];
}
*(exprval_t **) result->value = val;
}
UNOP(vector, pos, vec4f_t, +)
UNOP(vector, neg, vec4f_t, -)
@ -410,6 +482,7 @@ binop_t vector_binops[] = {
{ '/', &cexpr_vector, &cexpr_vector, vector_div },
{ '%', &cexpr_vector, &cexpr_vector, vector_rem },
{ MOD, &cexpr_vector, &cexpr_vector, vector_mod },
{ '.', &cexpr_field, &cexpr_exprval, vector_swizzle },
{}
};