diff options
Diffstat (limited to 'mesalib/src/mesa/program/ir_to_mesa.cpp')
| -rw-r--r-- | mesalib/src/mesa/program/ir_to_mesa.cpp | 179 |
1 files changed, 153 insertions, 26 deletions
diff --git a/mesalib/src/mesa/program/ir_to_mesa.cpp b/mesalib/src/mesa/program/ir_to_mesa.cpp index ae0df472d..1540eb77e 100644 --- a/mesalib/src/mesa/program/ir_to_mesa.cpp +++ b/mesalib/src/mesa/program/ir_to_mesa.cpp @@ -297,11 +297,11 @@ public: /**
* Emit the correct dot-product instruction for the type of arguments
*/
- void emit_dp(ir_instruction *ir,
- dst_reg dst,
- src_reg src0,
- src_reg src1,
- unsigned elements);
+ ir_to_mesa_instruction * emit_dp(ir_instruction *ir,
+ dst_reg dst,
+ src_reg src0,
+ src_reg src1,
+ unsigned elements);
void emit_scalar(ir_instruction *ir, enum prog_opcode op,
dst_reg dst, src_reg src0);
@@ -312,9 +312,11 @@ public: void emit_scs(ir_instruction *ir, enum prog_opcode op,
dst_reg dst, const src_reg &src);
- GLboolean try_emit_mad(ir_expression *ir,
+ bool try_emit_mad(ir_expression *ir,
int mul_operand);
- GLboolean try_emit_sat(ir_expression *ir);
+ bool try_emit_mad_for_and_not(ir_expression *ir,
+ int mul_operand);
+ bool try_emit_sat(ir_expression *ir);
void emit_swz(ir_expression *ir);
@@ -408,7 +410,7 @@ ir_to_mesa_visitor::emit(ir_instruction *ir, enum prog_opcode op) return emit(ir, op, undef_dst, undef_src, undef_src, undef_src);
}
-void
+ir_to_mesa_instruction *
ir_to_mesa_visitor::emit_dp(ir_instruction *ir,
dst_reg dst, src_reg src0, src_reg src1,
unsigned elements)
@@ -417,7 +419,7 @@ ir_to_mesa_visitor::emit_dp(ir_instruction *ir, OPCODE_DP2, OPCODE_DP3, OPCODE_DP4
};
- emit(ir, dot_opcodes[elements - 2], dst, src0, src1);
+ return emit(ir, dot_opcodes[elements - 2], dst, src0, src1);
}
/**
@@ -579,7 +581,7 @@ ir_to_mesa_visitor::emit_scs(ir_instruction *ir, enum prog_opcode op, }
}
-struct src_reg
+src_reg
ir_to_mesa_visitor::src_reg_for_float(float val)
{
src_reg src(PROGRAM_CONSTANT, -1, NULL);
@@ -723,7 +725,7 @@ ir_to_mesa_visitor::visit(ir_variable *ir) }
}
- struct variable_storage *storage;
+ variable_storage *storage;
dst_reg dst;
if (i == ir->num_state_slots) {
/* We'll set the index later. */
@@ -869,7 +871,7 @@ ir_to_mesa_visitor::visit(ir_function *ir) }
}
-GLboolean
+bool
ir_to_mesa_visitor::try_emit_mad(ir_expression *ir, int mul_operand)
{
int nonmul_operand = 1 - mul_operand;
@@ -892,7 +894,47 @@ ir_to_mesa_visitor::try_emit_mad(ir_expression *ir, int mul_operand) return true;
}
-GLboolean
+/**
+ * Emit OPCODE_MAD(a, -b, a) instead of AND(a, NOT(b))
+ *
+ * The logic values are 1.0 for true and 0.0 for false. Logical-and is
+ * implemented using multiplication, and logical-or is implemented using
+ * addition. Logical-not can be implemented as (true - x), or (1.0 - x).
+ * As result, the logical expression (a & !b) can be rewritten as:
+ *
+ * - a * !b
+ * - a * (1 - b)
+ * - (a * 1) - (a * b)
+ * - a + -(a * b)
+ * - a + (a * -b)
+ *
+ * This final expression can be implemented as a single MAD(a, -b, a)
+ * instruction.
+ */
+bool
+ir_to_mesa_visitor::try_emit_mad_for_and_not(ir_expression *ir, int try_operand)
+{
+ const int other_operand = 1 - try_operand;
+ src_reg a, b;
+
+ ir_expression *expr = ir->operands[try_operand]->as_expression();
+ if (!expr || expr->operation != ir_unop_logic_not)
+ return false;
+
+ ir->operands[other_operand]->accept(this);
+ a = this->result;
+ expr->operands[0]->accept(this);
+ b = this->result;
+
+ b.negate = ~b.negate;
+
+ this->result = get_temp(ir->type);
+ emit(ir, OPCODE_MAD, dst_reg(this->result), a, b, a);
+
+ return true;
+}
+
+bool
ir_to_mesa_visitor::try_emit_sat(ir_expression *ir)
{
/* Saturates were only introduced to vertex programs in
@@ -1088,6 +1130,16 @@ ir_to_mesa_visitor::visit(ir_expression *ir) if (try_emit_mad(ir, 0))
return;
}
+
+ /* Quick peephole: Emit OPCODE_MAD(-a, -b, a) instead of AND(a, NOT(b))
+ */
+ if (ir->operation == ir_binop_logic_and) {
+ if (try_emit_mad_for_and_not(ir, 1))
+ return;
+ if (try_emit_mad_for_and_not(ir, 0))
+ return;
+ }
+
if (try_emit_sat(ir))
return;
@@ -1135,7 +1187,13 @@ ir_to_mesa_visitor::visit(ir_expression *ir) switch (ir->operation) {
case ir_unop_logic_not:
- emit(ir, OPCODE_SEQ, result_dst, op[0], src_reg_for_float(0.0));
+ /* Previously 'SEQ dst, src, 0.0' was used for this. However, many
+ * older GPUs implement SEQ using multiple instructions (i915 uses two
+ * SGE instructions and a MUL instruction). Since our logic values are
+ * 0.0 and 1.0, 1-x also implements !x.
+ */
+ op[0].negate = ~op[0].negate;
+ emit(ir, OPCODE_ADD, result_dst, op[0], src_reg_for_float(1.0));
break;
case ir_unop_neg:
op[0].negate = ~op[0].negate;
@@ -1231,8 +1289,19 @@ ir_to_mesa_visitor::visit(ir_expression *ir) ir->operands[1]->type->is_vector()) {
src_reg temp = get_temp(glsl_type::vec4_type);
emit(ir, OPCODE_SNE, 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, OPCODE_SEQ, result_dst, result_src, src_reg_for_float(0.0));
+
+ /* Negating the result of the dot-product gives values on the range
+ * [-4, 0]. Zero becomes 1.0, and negative values become zero. This
+ * achieved using SGE.
+ */
+ src_reg sge_src = result_src;
+ sge_src.negate = ~sge_src.negate;
+ emit(ir, OPCODE_SGE, result_dst, sge_src, src_reg_for_float(0.0));
} else {
emit(ir, OPCODE_SEQ, result_dst, op[0], op[1]);
}
@@ -1243,29 +1312,83 @@ ir_to_mesa_visitor::visit(ir_expression *ir) ir->operands[1]->type->is_vector()) {
src_reg temp = get_temp(glsl_type::vec4_type);
emit(ir, OPCODE_SNE, dst_reg(temp), op[0], op[1]);
- emit_dp(ir, result_dst, temp, temp, vector_elements);
- emit(ir, OPCODE_SNE, result_dst, result_src, src_reg_for_float(0.0));
+
+ /* After the dot-product, the value will be an integer on the
+ * range [0,4]. Zero stays zero, and positive values become 1.0.
+ */
+ ir_to_mesa_instruction *const dp =
+ emit_dp(ir, result_dst, temp, temp, vector_elements);
+ if (this->prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
+ /* The clamping to [0,1] can be done for free in the fragment
+ * shader with a saturate.
+ */
+ dp->saturate = true;
+ } else {
+ /* Negating the result of the dot-product gives values on the range
+ * [-4, 0]. Zero stays zero, and negative values become 1.0. This
+ * achieved using SLT.
+ */
+ src_reg slt_src = result_src;
+ slt_src.negate = ~slt_src.negate;
+ emit(ir, OPCODE_SLT, result_dst, slt_src, src_reg_for_float(0.0));
+ }
} else {
emit(ir, OPCODE_SNE, result_dst, op[0], op[1]);
}
break;
- case ir_unop_any:
+ case ir_unop_any: {
assert(ir->operands[0]->type->is_vector());
- emit_dp(ir, result_dst, op[0], op[0],
- ir->operands[0]->type->vector_elements);
- emit(ir, OPCODE_SNE, result_dst, result_src, src_reg_for_float(0.0));
+
+ /* After the dot-product, the value will be an integer on the
+ * range [0,4]. Zero stays zero, and positive values become 1.0.
+ */
+ ir_to_mesa_instruction *const dp =
+ emit_dp(ir, result_dst, op[0], op[0],
+ ir->operands[0]->type->vector_elements);
+ if (this->prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
+ /* The clamping to [0,1] can be done for free in the fragment
+ * shader with a saturate.
+ */
+ dp->saturate = true;
+ } else {
+ /* Negating the result of the dot-product gives values on the range
+ * [-4, 0]. Zero stays zero, and negative values become 1.0. This
+ * is achieved using SLT.
+ */
+ src_reg slt_src = result_src;
+ slt_src.negate = ~slt_src.negate;
+ emit(ir, OPCODE_SLT, result_dst, slt_src, src_reg_for_float(0.0));
+ }
break;
+ }
case ir_binop_logic_xor:
emit(ir, OPCODE_SNE, result_dst, op[0], op[1]);
break;
- case ir_binop_logic_or:
- /* This could be a saturated add and skip the SNE. */
- emit(ir, OPCODE_ADD, result_dst, op[0], op[1]);
- emit(ir, OPCODE_SNE, result_dst, result_src, src_reg_for_float(0.0));
+ case ir_binop_logic_or: {
+ /* After the addition, the value will be an integer on the
+ * range [0,2]. Zero stays zero, and positive values become 1.0.
+ */
+ ir_to_mesa_instruction *add =
+ emit(ir, OPCODE_ADD, result_dst, op[0], op[1]);
+ if (this->prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
+ /* The clamping to [0,1] can be done for free in the fragment
+ * shader with a saturate.
+ */
+ add->saturate = true;
+ } else {
+ /* Negating the result of the addition gives values on the range
+ * [-2, 0]. Zero stays zero, and negative values become 1.0. This
+ * is achieved using SLT.
+ */
+ src_reg slt_src = result_src;
+ slt_src.negate = ~slt_src.negate;
+ emit(ir, OPCODE_SLT, result_dst, slt_src, src_reg_for_float(0.0));
+ }
break;
+ }
case ir_binop_logic_and:
/* the bool args are stored as float 0.0 or 1.0, so "mul" gives us "and". */
@@ -1981,7 +2104,10 @@ ir_to_mesa_visitor::visit(ir_texture *ir) ir_to_mesa_instruction *inst = NULL;
prog_opcode opcode = OPCODE_NOP;
- ir->coordinate->accept(this);
+ if (ir->op == ir_txs)
+ this->result = src_reg_for_float(0.0);
+ else
+ ir->coordinate->accept(this);
/* Put our coords in a temp. We'll need to modify them for shadow,
* projection, or LOD, so the only case we'd use it as is is if
@@ -2005,6 +2131,7 @@ ir_to_mesa_visitor::visit(ir_texture *ir) switch (ir->op) {
case ir_tex:
+ case ir_txs:
opcode = OPCODE_TEX;
break;
case ir_txb:
|