diff options
| -rw-r--r-- | src/mesa/shader/ir_to_mesa.cpp | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/mesa/shader/ir_to_mesa.cpp b/src/mesa/shader/ir_to_mesa.cpp index 11fb7b9f16a..59268e6d176 100644 --- a/src/mesa/shader/ir_to_mesa.cpp +++ b/src/mesa/shader/ir_to_mesa.cpp @@ -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); |