prototype for spirv linking

materialsystem/vulkan/rtlinker.cpp

@@ -36,6 +36,12 @@ void CVkShaderLinker::Build()
 	uint32_t last = 0;
 	uint32_t current = 0;
 
+
+	CUtlVector<uint32_t> callers = {};
+	mspv_array(mspv_function) functions_orig;
+	V_memcpy(&functions_orig, &mod->functions, sizeof(functions_orig));
+	mod->functions = {};
+
 	for ( int i = 0; i < mod->types.count; i++ )
 	{
 		SET_LAST(mod->types.data[i].id);
@@ -50,13 +56,20 @@ void CVkShaderLinker::Build()
 		SET_LAST(mod->variables.data[i].result);
 		SET_LAST(mod->variables.data[i].resulttype);
 	}
-	for ( int i = 0; i < mod->functions.count; i++ )
+	for ( int i = 0; i < functions_orig.count; i++ )
 	{
-		SET_LAST(mod->functions.data[i].result);
-		mspv_function &f = mod->functions.data[i];
+		SET_LAST(functions_orig.data[i].result);
+		mspv_function &f = functions_orig.data[i];
+		bool bIsCaller = false;
 		for ( int u = 0; u < f.instructions.len; )
 		{
 			SpvOp op = (SpvOp)(f.instructions.data[u]&0xFFFF);
+			if (op == SpvOpExecuteCallableKHR)
+			{
+				bIsCaller = true;
+				callers.AppendTail(i);
+				V_printf("found caller: %i %u\n", i, f.result);
+			}
 			uint32_t uOpLen = f.instructions.data[u]>>16;
 			uint32_t uOpCount = SpvGetOperandCount(op);
 			if (uOpCount == 0)
@@ -90,13 +103,16 @@ void CVkShaderLinker::Build()
 			}
 			u+=uOpLen;
 			V_free(peOps);
-
+			V_free(peFlags);
 		}
+		if (!bIsCaller)
+			mspv_array_push(mod->functions, f);
 	}
 	current = last;
 
 	/* now we can combine shaders*/
 	CUtlVector<uint32_t> functions = {};
+	CUtlVector<mspv_function> f = {};
 	for (auto &shader: m_shaders)
 	{
 		mspv_module *s = mspv_read_module(shader.m_size, shader.m_data);
@@ -117,6 +133,14 @@ void CVkShaderLinker::Build()
 		for ( int i = 0; i < s->entry_points.count; i++ )
 		{
 			functions.AppendTail(s->entry_points.data[i].id+current);
+			for ( uint32_t u = 0; u < s->functions.count; u++ )
+			{
+				if (s->functions.data[u].result != s->entry_points.data[i].id)
+					continue;
+				f.AppendTail(s->functions.data[u]);
+				break;
+
+			}
 			SET_LAST(s->entry_points.data[i].id+current);
 		}
 
@@ -222,6 +246,52 @@ void CVkShaderLinker::Build()
 		}
 		current = last;
 	}
+	/* generate trace call */
+	V_printf("functions %i\n", functions.GetSize());
+	uint32_t n = 0;
+	for ( auto &c: callers )
+	{
+		CUtlVector<uint32_t> ops = {};
+		mspv_function fn = functions_orig.data[c];
+		mspv_data_view dv = fn.instructions;
+		uint32_t u;
+		CUtlVector<uint32_t> inputs = {};
+		
+		u = 0;
+		while(u < fn.instructions.len)
+		{	
+			SpvOp op = (SpvOp)(dv.data[u]&0xFFFF);
+			uint32_t uOpLen = dv.data[u]>>16;
+			if (op != SpvOpFunctionParameter)
+			{
+				break;
+			}
+			ops.AppendTail(&dv.data[u], uOpLen);
+			inputs.AppendTail(dv.data[u+2]);
+			u += uOpLen;
+		}
+		ops.AppendTail(mspv_make_op(SpvOpLabel, 1));
+		ops.AppendTail(current++);
+
+		ops.AppendTail(mspv_make_op(SpvOpFunctionCall, 5));
+		ops.AppendTail(f[n].resulttype);
+		ops.AppendTail(current++);
+		ops.AppendTail(f[n].result);
+		ops.AppendTail(inputs[0]);
+		ops.AppendTail(inputs[1]);
+
+		ops.AppendTail(mspv_make_op(SpvOpReturn, 0));
+
+
+
+		fn.instructions.data = (uint32_t*)V_malloc(ops.GetSize()*sizeof(uint32_t));
+		V_memcpy(fn.instructions.data, ops.GetData(), ops.GetSize()*sizeof(uint32_t));
+		fn.instructions.len = ops.GetSize();
+		mspv_array_push(mod->functions, fn);
+
+		n++;
+
+	}
 
 	mspv_spv spv = mspv_write_module(mod);
 	mspv_close_module(mod);