diff options
Diffstat (limited to 'src/mesa')
| -rw-r--r-- | src/mesa/program/ir_to_mesa.cpp | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp index f24dce79f6..de0cb1ac5b 100644 --- a/src/mesa/program/ir_to_mesa.cpp +++ b/src/mesa/program/ir_to_mesa.cpp @@ -1577,13 +1577,39 @@ ir_to_mesa_visitor::visit(ir_assignment *ir) assert(!ir->lhs->type->is_scalar() && !ir->lhs->type->is_vector()); l.writemask = WRITEMASK_XYZW; } else if (ir->lhs->type->is_scalar()) { - /* FINISHME: This hack makes writing to gl_FragData, which lives in the + /* FINISHME: This hack makes writing to gl_FragDepth, which lives in the * FINISHME: W component of fragment shader output zero, work correctly. */ l.writemask = WRITEMASK_XYZW; } else { + int swizzles[4]; + int first_enabled_chan = 0; + int rhs_chan = 0; + assert(ir->lhs->type->is_vector()); l.writemask = ir->write_mask; + + for (int i = 0; i < 4; i++) { + if (l.writemask & (1 << i)) { + first_enabled_chan = GET_SWZ(r.swizzle, i); + break; + } + } + + /* Swizzle a small RHS vector into the channels being written. + * + * glsl ir treats write_mask as dictating how many channels are + * present on the RHS while Mesa IR treats write_mask as just + * showing which channels of the vec4 RHS get written. + */ + for (int i = 0; i < 4; i++) { + if (l.writemask & (1 << i)) + swizzles[i] = GET_SWZ(r.swizzle, rhs_chan++); + else + swizzles[i] = first_enabled_chan; + } + r.swizzle = MAKE_SWIZZLE4(swizzles[0], swizzles[1], + swizzles[2], swizzles[3]); } assert(l.file != PROGRAM_UNDEFINED); |