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authorEric Anholt <eric@anholt.net>2010-11-19 18:50:05 +0800
committerEric Anholt <eric@anholt.net>2010-11-19 19:09:32 -0800
commitac89a90401f08df945248fcc96da59ba0e2bbfa9 (patch)
tree0de4f0dab1db2a65d45a78677c73ba074289d5fb /src/mesa/program
parent19631fab35ca4d5ca64d606922f3f20774b27645 (diff)
ir_to_mesa: Detect and emit MOV_SATs for saturate constructs.
The goal here is to avoid regressing performance on ir_to_mesa drivers for fixed function fragment shaders requiring saturates.
Diffstat (limited to 'src/mesa/program')
-rw-r--r--src/mesa/program/ir_to_mesa.cpp32
1 files changed, 32 insertions, 0 deletions
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index c7a8594f72..98da90d359 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -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;