mesa: Add GL/GLSL plumbing for ARB_fragment_shader_interlock.

This extension provides new GLSL built-in functions
beginInvocationInterlockARB() and endInvocationInterlockARB()
that delimit a critical section of fragment shader code. For
pairs of shader invocations with "overlapping" coverage in a
given pixel, the OpenGL implementation will guarantee that the
critical section of the fragment shader will be executed for
only one fragment at a time.

Signed-off-by: Plamena Manolova <[email protected]>
Reviewed-by: Francisco Jerez <[email protected]>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/compiler/glsl/glsl_to_nir.cpp b/src/compiler/glsl/glsl_to_nir.cpp
index 8e5e9c34912..dc3e822308b 100644
--- a/src/compiler/glsl/glsl_to_nir.cpp
+++ b/src/compiler/glsl/glsl_to_nir.cpp
@@ -752,6 +752,12 @@ nir_visitor::visit(ir_call *ir)
       case ir_intrinsic_shader_clock:
          op = nir_intrinsic_shader_clock;
          break;
+      case ir_intrinsic_begin_invocation_interlock:
+         op = nir_intrinsic_begin_invocation_interlock;
+         break;
+      case ir_intrinsic_end_invocation_interlock:
+         op = nir_intrinsic_end_invocation_interlock;
+         break;
       case ir_intrinsic_group_memory_barrier:
          op = nir_intrinsic_group_memory_barrier;
          break;
@@ -970,6 +976,12 @@ nir_visitor::visit(ir_call *ir)
          instr->num_components = 2;
          nir_builder_instr_insert(&b, &instr->instr);
          break;
+      case nir_intrinsic_begin_invocation_interlock:
+         nir_builder_instr_insert(&b, &instr->instr);
+         break;
+      case nir_intrinsic_end_invocation_interlock:
+         nir_builder_instr_insert(&b, &instr->instr);
+         break;
       case nir_intrinsic_store_ssbo: {
          exec_node *param = ir->actual_parameters.get_head();
          ir_rvalue *block = ((ir_instruction *)param)->as_rvalue();