initial commit, 4.5 stable

servers/rendering/shader_compiler.h

@@ -0,0 +1,136 @@
+/**************************************************************************/
+/*  shader_compiler.h                                                     */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "core/templates/pair.h"
+#include "servers/rendering/shader_language.h"
+#include "servers/rendering_server.h"
+
+class ShaderCompiler {
+public:
+	enum Stage {
+		STAGE_VERTEX,
+		STAGE_FRAGMENT,
+		STAGE_COMPUTE,
+		STAGE_MAX
+	};
+
+	struct IdentifierActions {
+		HashMap<StringName, Stage> entry_point_stages;
+
+		HashMap<StringName, Pair<int *, int>> render_mode_values;
+		HashMap<StringName, bool *> render_mode_flags;
+		HashMap<StringName, bool *> usage_flag_pointers;
+		HashMap<StringName, bool *> write_flag_pointers;
+		HashMap<StringName, Pair<int *, int>> stencil_mode_values;
+		int *stencil_reference = nullptr;
+
+		HashMap<StringName, ShaderLanguage::ShaderNode::Uniform> *uniforms = nullptr;
+	};
+
+	struct GeneratedCode {
+		Vector<String> defines;
+		struct Texture {
+			StringName name;
+			ShaderLanguage::DataType type = ShaderLanguage::DataType::TYPE_VOID;
+			ShaderLanguage::ShaderNode::Uniform::Hint hint = ShaderLanguage::ShaderNode::Uniform::Hint::HINT_NONE;
+			bool use_color = false;
+			ShaderLanguage::TextureFilter filter = ShaderLanguage::TextureFilter::FILTER_DEFAULT;
+			ShaderLanguage::TextureRepeat repeat = ShaderLanguage::TextureRepeat::REPEAT_DEFAULT;
+			bool global = false;
+			int array_size = 0;
+		};
+
+		Vector<Texture> texture_uniforms;
+
+		Vector<uint32_t> uniform_offsets;
+		uint32_t uniform_total_size = 0;
+		String uniforms;
+		String stage_globals[STAGE_MAX];
+
+		HashMap<String, String> code;
+
+		bool uses_global_textures = false;
+		bool uses_fragment_time = false;
+		bool uses_vertex_time = false;
+		bool uses_screen_texture_mipmaps = false;
+		bool uses_screen_texture = false;
+		bool uses_depth_texture = false;
+		bool uses_normal_roughness_texture = false;
+	};
+
+	struct DefaultIdentifierActions {
+		HashMap<StringName, String> renames;
+		HashMap<StringName, String> render_mode_defines;
+		HashMap<StringName, String> usage_defines;
+		HashMap<StringName, String> custom_samplers;
+		ShaderLanguage::TextureFilter default_filter = ShaderLanguage::TextureFilter::FILTER_NEAREST;
+		ShaderLanguage::TextureRepeat default_repeat = ShaderLanguage::TextureRepeat::REPEAT_DISABLE;
+		int base_texture_binding_index = 0;
+		int texture_layout_set = 0;
+		String base_uniform_string;
+		String global_buffer_array_variable;
+		String instance_uniform_index_variable;
+		uint32_t base_varying_index = 0;
+		bool apply_luminance_multiplier = false;
+		bool check_multiview_samplers = false;
+	};
+
+private:
+	ShaderLanguage parser;
+
+	String _get_sampler_name(ShaderLanguage::TextureFilter p_filter, ShaderLanguage::TextureRepeat p_repeat);
+
+	void _dump_function_deps(const ShaderLanguage::ShaderNode *p_node, const StringName &p_for_func, const HashMap<StringName, String> &p_func_code, String &r_to_add, HashSet<StringName> &added);
+	String _dump_node_code(const ShaderLanguage::Node *p_node, int p_level, GeneratedCode &r_gen_code, IdentifierActions &p_actions, const DefaultIdentifierActions &p_default_actions, bool p_assigning, bool p_scope = true);
+
+	const ShaderLanguage::ShaderNode *shader = nullptr;
+	const ShaderLanguage::FunctionNode *function = nullptr;
+	StringName current_func_name;
+	StringName time_name;
+	HashSet<StringName> texture_functions;
+
+	HashSet<StringName> used_name_defines;
+	HashSet<StringName> used_flag_pointers;
+	HashSet<StringName> used_rmode_defines;
+	HashSet<StringName> internal_functions;
+	HashSet<StringName> fragment_varyings;
+
+	DefaultIdentifierActions actions;
+
+	static ShaderLanguage::DataType _get_global_shader_uniform_type(const StringName &p_name);
+
+public:
+	Error compile(RS::ShaderMode p_mode, const String &p_code, IdentifierActions *p_actions, const String &p_path, GeneratedCode &r_gen_code);
+
+	void initialize(DefaultIdentifierActions p_actions);
+	ShaderCompiler();
+};