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glsl/ir_builder: Add a new swizzle_for_size() function.

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This swizzles away unwanted components, while preserving the order of
the ones that remain.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke 2012-07-09 20:59:29 -07:00
parent 0bb3d4ba54
commit d9da350a83
2 changed files with 20 additions and 0 deletions
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15
src/glsl/ir_builder.cpp
View file

@ -76,6 +76,21 @@ swizzle(operand a, int swizzle, int components)
components);
}
ir_swizzle *
swizzle_for_size(operand a, int components)
{
void *mem_ctx = ralloc_parent(a.val);
if (a.val->type->vector_elements < components)
components = a.val->type->vector_elements;
unsigned s[4] = { 0, 1, 2, 3 };
for (int i = components; i < 4; i++)
s[i] = components - 1;
return new(mem_ctx) ir_swizzle(a.val, s, components);
}
ir_swizzle *
swizzle_xxxx(operand a)
{

5
src/glsl/ir_builder.h
View file

@ -91,6 +91,11 @@ ir_expression *mul(operand a, operand b);
ir_expression *dot(operand a, operand b);
ir_expression *saturate(operand a);
/**
* Swizzle away later components, but preserve the ordering.
*/
ir_swizzle *swizzle_for_size(operand a, int components);
ir_swizzle *swizzle_xxxx(operand a);
ir_swizzle *swizzle_yyyy(operand a);
ir_swizzle *swizzle_zzzz(operand a);