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glsl: Simplify generation of swizzle for vector constructors

This commit is contained in:
Ian Romanick 2010-11-15 13:41:06 -08:00
parent 38e55153af
commit 2d2d6a80c1
1 changed files with 5 additions and 6 deletions
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11
src/glsl/ast_function.cpp
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@ -577,18 +577,17 @@ emit_inline_vector_constructor(const glsl_type *type,
const ir_constant *const c = param->as_constant();
if (c == NULL) {
/* Generate a swizzle in case rhs_components != rhs->type->vector_elements. */
unsigned swiz[4] = { 0, 0, 0, 0 };
for (unsigned i = 0; i < rhs_components; i++)
swiz[i] = i;
/* Mask of fields to be written in the assignment.
*/
const unsigned write_mask = ((1U << rhs_components) - 1)
<< base_component;
ir_dereference *lhs = new(ctx) ir_dereference_variable(var);
ir_rvalue *rhs = new(ctx) ir_swizzle(param, swiz, rhs_components);
/* Generate a swizzle so that LHS and RHS sizes match.
*/
ir_rvalue *rhs =
new(ctx) ir_swizzle(param, 0, 1, 2, 3, rhs_components);
ir_instruction *inst =
new(ctx) ir_assignment(lhs, rhs, NULL, write_mask);