From 9996a86085edb2bdbcb165d985203ee8ce6a9b22 Mon Sep 17 00:00:00 2001 From: Ian Romanick Date: Mon, 4 Apr 2011 13:35:26 -0700 Subject: [PATCH] ir_to_mesa: Handle shadow compare w/projection and LOD bias correctly The code would previously handle the projection, then swizzle the shadow comparitor into place. However, when the projection is done "by hand," as in the TXB case, the unprojected shadow comparitor would over-write the projected shadow comparitor. Shadow comparison with projection and LOD is an extremely rare case in real application code, so it shouldn't matter that we don't handle that case with the greatest efficiency. NOTE: This is a candidate for the stable branches. Reviewed-by: Brian Paul References: https://bugs.freedesktop.org/show_bug.cgi?id=32395 --- src/mesa/program/ir_to_mesa.cpp | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp index bf2513d4748..7c1ae46ff33 100644 --- a/src/mesa/program/ir_to_mesa.cpp +++ b/src/mesa/program/ir_to_mesa.cpp @@ -2084,15 +2084,39 @@ ir_to_mesa_visitor::visit(ir_texture *ir) coord_dst.writemask = WRITEMASK_W; ir_to_mesa_emit_op1(ir, OPCODE_RCP, coord_dst, projector); + /* In the case where we have to project the coordinates "by hand," + * the shadow comparitor value must also be projected. + */ + ir_to_mesa_src_reg tmp_src = coord; + if (ir->shadow_comparitor) { + /* Slot the shadow value in as the second to last component of the + * coord. + */ + ir->shadow_comparitor->accept(this); + + tmp_src = get_temp(glsl_type::vec4_type); + ir_to_mesa_dst_reg tmp_dst = ir_to_mesa_dst_reg_from_src(tmp_src); + + tmp_dst.writemask = WRITEMASK_Z; + ir_to_mesa_emit_op1(ir, OPCODE_MOV, tmp_dst, this->result); + + tmp_dst.writemask = WRITEMASK_XY; + ir_to_mesa_emit_op1(ir, OPCODE_MOV, tmp_dst, coord); + } + coord_dst.writemask = WRITEMASK_XYZ; - ir_to_mesa_emit_op2(ir, OPCODE_MUL, coord_dst, coord, coord_w); + ir_to_mesa_emit_op2(ir, OPCODE_MUL, coord_dst, tmp_src, coord_w); coord_dst.writemask = WRITEMASK_XYZW; coord.swizzle = SWIZZLE_XYZW; } } - if (ir->shadow_comparitor) { + /* If projection is done and the opcode is not OPCODE_TXP, then the shadow + * comparitor was put in the correct place (and projected) by the code, + * above, that handles by-hand projection. + */ + if (ir->shadow_comparitor && (!ir->projector || opcode == OPCODE_TXP)) { /* Slot the shadow value in as the second to last component of the * coord. */ -- 2.30.2