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ir_to_mesa: Fix sparse swizzling of src regs when a writemask is present.

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Fixes glsl-fs-texture2d-masked.
This commit is contained in:
Eric Anholt
2010-07-02 14:06:34 -07:00
parent 28faa12dc2
commit cab95c228b
1 changed files with 26 additions and 0 deletions
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26
src/mesa/shader/ir_to_mesa.cpp
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@@ -1175,6 +1175,29 @@ get_assignment_lhs(ir_instruction *ir, ir_to_mesa_visitor *v)
return dst_reg;
}
static GLuint
reswizzle_for_writemask(GLuint writemask, GLuint swizzle)
{
int new_swizzle[4], pos = 0;
int i;
/* reswizzle the rhs so the components are in place for the
* components we'll assign to the lhs.
*/
for (i = 0; i < 4; i++) {
if (writemask & (1 << i)) {
new_swizzle[i] = GET_SWZ(swizzle, pos++);
} else {
new_swizzle[i] = GET_SWZ(swizzle, 0);
}
}
return MAKE_SWIZZLE4(new_swizzle[0],
new_swizzle[1],
new_swizzle[2],
new_swizzle[3]);
}
void
ir_to_mesa_visitor::visit(ir_assignment *ir)
{
@@ -1189,6 +1212,9 @@ ir_to_mesa_visitor::visit(ir_assignment *ir)
ir->rhs->accept(this);
r = this->result;
r.swizzle = reswizzle_for_writemask(l.writemask, r.swizzle);
assert(l.file != PROGRAM_UNDEFINED);
assert(r.file != PROGRAM_UNDEFINED);