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glsl: Add a new ir_builder::dotlike() function.

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dotlike() uses ir_binop_mul for scalars, and ir_binop_dot for vectors.

When generating built-in functions, we often want to use regular
multiply for scalar signatures, and dot() for vector signatures.
ir_binop_dot only works on vectors, so we have to switch opcodes,
even if the code is otherwise identical.  dotlike() makes this easy.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
This commit is contained in:
Kenneth Graunke 2013-09-03 16:46:05 -07:00
parent d716b3376c
commit 202238824b
2 changed files with 12 additions and 0 deletions
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11
src/glsl/ir_builder.cpp
View file

@ -231,6 +231,17 @@ ir_expression *dot(operand a, operand b)
return expr(ir_binop_dot, a, b);
}
/* dot for vectors, mul for scalars */
ir_expression *dotlike(operand a, operand b)
{
assert(a.val->type == b.val->type);
if (a.val->type->vector_elements == 1)
return expr(ir_binop_mul, a, b);
return expr(ir_binop_dot, a, b);
}
ir_expression*
clamp(operand a, operand b, operand c)
{

1
src/glsl/ir_builder.h
View file

@ -136,6 +136,7 @@ ir_expression *mul(operand a, operand b);
ir_expression *div(operand a, operand b);
ir_expression *round_even(operand a);
ir_expression *dot(operand a, operand b);
ir_expression *dotlike(operand a, operand b);
ir_expression *clamp(operand a, operand b, operand c);
ir_expression *saturate(operand a);
ir_expression *abs(operand a);