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glsl_to_tgsi: implement ir_binop_all_equal using DP4 w/SGE

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This is a port of commit ba01df11c4 to glsl_to_tgsi with integer support
added.
This commit is contained in:
Bryan Cain 2011-08-20 14:15:03 -05:00
parent f3dce133f0
commit 9098953ee6
1 changed files with 19 additions and 1 deletions
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20
src/mesa/state_tracker/st_glsl_to_tgsi.cpp
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@ -1460,8 +1460,26 @@ glsl_to_tgsi_visitor::visit(ir_expression *ir)
glsl_type::vec4_type);
assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
emit(ir, TGSI_OPCODE_SNE, st_dst_reg(temp), op[0], op[1]);
/* After the dot-product, the value will be an integer on the
* range [0,4]. Zero becomes 1.0, and positive values become zero.
*/
emit_dp(ir, result_dst, temp, temp, vector_elements);
emit(ir, TGSI_OPCODE_SEQ, result_dst, result_src, st_src_reg_for_float(0.0));
if (result_dst.type == GLSL_TYPE_FLOAT) {
/* Negating the result of the dot-product gives values on the range
* [-4, 0]. Zero becomes 1.0, and negative values become zero.
* This is achieved using SGE.
*/
st_src_reg sge_src = result_src;
sge_src.negate = ~sge_src.negate;
emit(ir, TGSI_OPCODE_SGE, result_dst, sge_src, st_src_reg_for_float(0.0));
} else {
/* The TGSI negate flag doesn't work for integers, so use SEQ 0
* instead.
*/
emit(ir, TGSI_OPCODE_SEQ, result_dst, result_src, st_src_reg_for_int(0));
}
} else {
emit(ir, TGSI_OPCODE_SEQ, result_dst, op[0], op[1]);
}