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ir_to_mesa: Detect and emit MOV_SATs for saturate constructs.

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The goal here is to avoid regressing performance on ir_to_mesa drivers
for fixed function fragment shaders requiring saturates.
This commit is contained in:
Eric Anholt
2010-11-19 18:50:05 +08:00
parent 19631fab35
commit ac89a90401
1 changed files with 32 additions and 0 deletions
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32
src/mesa/program/ir_to_mesa.cpp
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@@ -123,6 +123,7 @@ public:
/** Pointer to the ir source this tree came from for debugging */
ir_instruction *ir;
GLboolean cond_update;
bool saturate;
int sampler; /**< sampler index */
int tex_target; /**< One of TEXTURE_*_INDEX */
GLboolean tex_shadow;
@@ -288,6 +289,7 @@ public:
GLboolean try_emit_mad(ir_expression *ir,
int mul_operand);
GLboolean try_emit_sat(ir_expression *ir);
void emit_swz(ir_expression *ir);
@@ -939,6 +941,32 @@ ir_to_mesa_visitor::try_emit_mad(ir_expression *ir, int mul_operand)
return true;
}
GLboolean
ir_to_mesa_visitor::try_emit_sat(ir_expression *ir)
{
/* Saturates were only introduced to vertex programs in
* NV_vertex_program3, so don't give them to drivers in the VP.
*/
if (this->prog->Target == GL_VERTEX_PROGRAM_ARB)
return false;
ir_rvalue *sat_src = ir->as_rvalue_to_saturate();
if (!sat_src)
return false;
sat_src->accept(this);
ir_to_mesa_src_reg src = this->result;
this->result = get_temp(ir->type);
ir_to_mesa_instruction *inst;
inst = ir_to_mesa_emit_op1(ir, OPCODE_MOV,
ir_to_mesa_dst_reg_from_src(this->result),
src);
inst->saturate = true;
return true;
}
void
ir_to_mesa_visitor::reladdr_to_temp(ir_instruction *ir,
ir_to_mesa_src_reg *reg, int *num_reladdr)
@@ -1092,6 +1120,8 @@ ir_to_mesa_visitor::visit(ir_expression *ir)
if (try_emit_mad(ir, 0))
return;
}
if (try_emit_sat(ir))
return;
if (ir->operation == ir_quadop_vector) {
this->emit_swz(ir);
@@ -2678,6 +2708,8 @@ get_mesa_program(struct gl_context *ctx, struct gl_shader_program *shader_progra
mesa_inst->Opcode = inst->op;
mesa_inst->CondUpdate = inst->cond_update;
if (inst->saturate)
mesa_inst->SaturateMode = SATURATE_ZERO_ONE;
mesa_inst->DstReg.File = inst->dst_reg.file;
mesa_inst->DstReg.Index = inst->dst_reg.index;
mesa_inst->DstReg.CondMask = inst->dst_reg.cond_mask;