[SPIR-V] Write more fragment code

Sources/backends/spirv.c

@@ -955,6 +955,56 @@ static void spirv_export_fragment(char *directory, function *main) {
 	write_instruction_schema(&instructions);
 
 	write_capabilities(&instructions);
+	write_op_ext_inst_import(&decorations, "GLSL.std.450");
+	write_op_memory_model(&decorations, ADDRESSING_MODEL_LOGICAL, MEMORY_MODEL_GLSL450);
+	uint32_t entry_point = allocate_index();
+	output_var = allocate_index();
+	input_var = allocate_index();
+	uint32_t interfaces[] = {output_var, input_var};
+	write_op_entry_point(&decorations, EXECUTION_MODEL_FRAGMENT, entry_point, "main", interfaces, sizeof(interfaces) / 4);
+
+	uint32_t output_struct = allocate_index();
+	write_vertex_output_decorations(&decorations, output_struct);
+
+	uint32_t inputs[256];
+	inputs[0] = allocate_index();
+	write_vertex_input_decorations(&decorations, inputs, 1);
+
+	// write_base_types(&constants, vertex_input);
+
+	write_op_variable_with_result(&instructions, output_struct_pointer_type, output_var, STORAGE_CLASS_OUTPUT);
+
+	type *input = get_type(pixel_input);
+
+	for (size_t i = 0; i < input->members.size; ++i) {
+		member m = input->members.m[i];
+		if (m.type.type == float2_id) {
+			write_op_variable_with_result(&instructions, spirv_float2_type, input_var, STORAGE_CLASS_INPUT);
+		}
+		else if (m.type.type == float3_id) {
+			write_op_variable_with_result(&instructions, spirv_float3_type, input_var, STORAGE_CLASS_INPUT);
+		}
+		else if (m.type.type == float4_id) {
+			write_op_variable_with_result(&instructions, spirv_float4_type, input_var, STORAGE_CLASS_INPUT);
+		}
+		else {
+			debug_context context = {0};
+			error(context, "Type unsupported for input in SPIR-V");
+		}
+	}
+
+	// write_functions(&instructions, main, SHADER_STAGE_VERTEX, vertex_input, input_var, vertex_output, output_var);
+
+	write_types(&constants);
+
+	// header
+	write_magic_number(&header);
+	write_version_number(&header);
+	write_generator_magic_number(&header);
+	write_bound(&header);
+	write_instruction_schema(&header);
+
+	write_constants(&constants);
 
 	char *name = get_name(main->name);