Added SDF nodes to visual shader

1 files changed, 283 insertions, 0 deletions

diff --git a/scene/resources/visual_shader_sdf_nodes.cpp b/scene/resources/visual_shader_sdf_nodes.cpp
new file mode 100644
index 0000000000..d25e32b070
--- /dev/null
+++ b/scene/resources/visual_shader_sdf_nodes.cpp
@@ -0,0 +1,283 @@
+/*************************************************************************/
+/*  visual_shader_sdf_nodes.cpp                                          */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* 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.                */
+/*************************************************************************/
+
+#include "visual_shader_sdf_nodes.h"
+
+// VisualShaderNodeSDFToScreenUV
+
+String VisualShaderNodeSDFToScreenUV::get_caption() const {
+	return "SDFToScreenUV";
+}
+
+int VisualShaderNodeSDFToScreenUV::get_input_port_count() const {
+	return 1;
+}
+
+VisualShaderNodeSDFToScreenUV::PortType VisualShaderNodeSDFToScreenUV::get_input_port_type(int p_port) const {
+	return PORT_TYPE_VECTOR;
+}
+
+String VisualShaderNodeSDFToScreenUV::get_input_port_name(int p_port) const {
+	return "sdf_pos";
+}
+
+int VisualShaderNodeSDFToScreenUV::get_output_port_count() const {
+	return 1;
+}
+
+VisualShaderNodeSDFToScreenUV::PortType VisualShaderNodeSDFToScreenUV::get_output_port_type(int p_port) const {
+	return PORT_TYPE_VECTOR;
+}
+
+String VisualShaderNodeSDFToScreenUV::get_output_port_name(int p_port) const {
+	return "";
+}
+
+String VisualShaderNodeSDFToScreenUV::generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview) const {
+	return "\t" + p_output_vars[0] + " = vec3(sdf_to_screen_uv(" + (p_input_vars[0] == String() ? "vec2(0.0)" : p_input_vars[0] + ".xy") + "), 0.0f);\n";
+}
+
+VisualShaderNodeSDFToScreenUV::VisualShaderNodeSDFToScreenUV() {
+}
+
+// VisualShaderNodeScreenUVToSDF
+
+String VisualShaderNodeScreenUVToSDF::get_caption() const {
+	return "ScreenUVToSDF";
+}
+
+int VisualShaderNodeScreenUVToSDF::get_input_port_count() const {
+	return 1;
+}
+
+VisualShaderNodeScreenUVToSDF::PortType VisualShaderNodeScreenUVToSDF::get_input_port_type(int p_port) const {
+	return PORT_TYPE_VECTOR;
+}
+
+String VisualShaderNodeScreenUVToSDF::get_input_port_name(int p_port) const {
+	return "uv";
+}
+
+int VisualShaderNodeScreenUVToSDF::get_output_port_count() const {
+	return 1;
+}
+
+VisualShaderNodeScreenUVToSDF::PortType VisualShaderNodeScreenUVToSDF::get_output_port_type(int p_port) const {
+	return PORT_TYPE_VECTOR;
+}
+
+String VisualShaderNodeScreenUVToSDF::get_output_port_name(int p_port) const {
+	return "";
+}
+
+String VisualShaderNodeScreenUVToSDF::get_input_port_default_hint(int p_port) const {
+	if (p_port == 0) {
+		return "default";
+	}
+	return "";
+}
+
+String VisualShaderNodeScreenUVToSDF::generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview) const {
+	return "\t" + p_output_vars[0] + " = vec3(screen_uv_to_sdf(" + (p_input_vars[0] == String() ? "SCREEN_UV" : p_input_vars[0] + ".xy") + "), 0.0f);\n";
+}
+
+VisualShaderNodeScreenUVToSDF::VisualShaderNodeScreenUVToSDF() {
+}
+
+// VisualShaderNodeTextureSDF
+
+String VisualShaderNodeTextureSDF::get_caption() const {
+	return "TextureSDF";
+}
+
+int VisualShaderNodeTextureSDF::get_input_port_count() const {
+	return 1;
+}
+
+VisualShaderNodeTextureSDF::PortType VisualShaderNodeTextureSDF::get_input_port_type(int p_port) const {
+	return PORT_TYPE_VECTOR;
+}
+
+String VisualShaderNodeTextureSDF::get_input_port_name(int p_port) const {
+	return "sdf_pos";
+}
+
+int VisualShaderNodeTextureSDF::get_output_port_count() const {
+	return 1;
+}
+
+VisualShaderNodeTextureSDF::PortType VisualShaderNodeTextureSDF::get_output_port_type(int p_port) const {
+	return PORT_TYPE_SCALAR;
+}
+
+String VisualShaderNodeTextureSDF::get_output_port_name(int p_port) const {
+	return "";
+}
+
+String VisualShaderNodeTextureSDF::generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview) const {
+	return "\t" + p_output_vars[0] + " = texture_sdf(" + (p_input_vars[0] == String() ? "vec2(0.0)" : p_input_vars[0] + ".xy") + ");\n";
+}
+
+VisualShaderNodeTextureSDF::VisualShaderNodeTextureSDF() {
+}
+
+// VisualShaderNodeTextureSDFNormal
+
+String VisualShaderNodeTextureSDFNormal::get_caption() const {
+	return "TextureSDFNormal";
+}
+
+int VisualShaderNodeTextureSDFNormal::get_input_port_count() const {
+	return 1;
+}
+
+VisualShaderNodeTextureSDFNormal::PortType VisualShaderNodeTextureSDFNormal::get_input_port_type(int p_port) const {
+	return PORT_TYPE_VECTOR;
+}
+
+String VisualShaderNodeTextureSDFNormal::get_input_port_name(int p_port) const {
+	return "sdf_pos";
+}
+
+int VisualShaderNodeTextureSDFNormal::get_output_port_count() const {
+	return 1;
+}
+
+VisualShaderNodeTextureSDFNormal::PortType VisualShaderNodeTextureSDFNormal::get_output_port_type(int p_port) const {
+	return PORT_TYPE_VECTOR;
+}
+
+String VisualShaderNodeTextureSDFNormal::get_output_port_name(int p_port) const {
+	return "";
+}
+
+String VisualShaderNodeTextureSDFNormal::generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview) const {
+	return "\t" + p_output_vars[0] + " = vec3(texture_sdf_normal(" + (p_input_vars[0] == String() ? "vec2(0.0)" : p_input_vars[0] + ".xy") + "), 0.0f);\n";
+}
+
+VisualShaderNodeTextureSDFNormal::VisualShaderNodeTextureSDFNormal() {
+}
+
+// VisualShaderNodeSDFRaymarch
+
+String VisualShaderNodeSDFRaymarch::get_caption() const {
+	return "SDFRaymarch";
+}
+
+int VisualShaderNodeSDFRaymarch::get_input_port_count() const {
+	return 2;
+}
+
+VisualShaderNodeSDFRaymarch::PortType VisualShaderNodeSDFRaymarch::get_input_port_type(int p_port) const {
+	if (p_port == 0 || p_port == 1) {
+		return PORT_TYPE_VECTOR;
+	}
+	return PORT_TYPE_SCALAR;
+}
+
+String VisualShaderNodeSDFRaymarch::get_input_port_name(int p_port) const {
+	if (p_port == 0) {
+		return "from_pos";
+	} else if (p_port == 1) {
+		return "to_pos";
+	}
+	return String();
+}
+
+int VisualShaderNodeSDFRaymarch::get_output_port_count() const {
+	return 3;
+}
+
+VisualShaderNodeSDFRaymarch::PortType VisualShaderNodeSDFRaymarch::get_output_port_type(int p_port) const {
+	if (p_port == 0) {
+		return PORT_TYPE_SCALAR;
+	} else if (p_port == 1) {
+		return PORT_TYPE_BOOLEAN;
+	} else if (p_port == 2) {
+		return PORT_TYPE_VECTOR;
+	}
+	return PORT_TYPE_SCALAR;
+}
+
+String VisualShaderNodeSDFRaymarch::get_output_port_name(int p_port) const {
+	if (p_port == 0) {
+		return "distance";
+	} else if (p_port == 1) {
+		return "hit";
+	} else if (p_port == 2) {
+		return "end_pos";
+	}
+	return String();
+}
+
+String VisualShaderNodeSDFRaymarch::generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview) const {
+	String code;
+
+	code += "\t{\n";
+
+	if (p_input_vars[0] == String()) {
+		code += "\t\tvec2 __from_pos = vec2(0.0f);\n";
+	} else {
+		code += "\t\tvec2 __from_pos = " + p_input_vars[0] + ".xy;\n";
+	}
+
+	if (p_input_vars[1] == String()) {
+		code += "\t\tvec2 __to_pos = vec2(0.0f);\n";
+	} else {
+		code += "\t\tvec2 __to_pos = " + p_input_vars[1] + ".xy;\n";
+	}
+
+	code += "\n\t\tvec2 __at = __from_pos;\n";
+	code += "\t\tfloat __max_dist = distance(__from_pos, __to_pos);\n";
+	code += "\t\tvec2 __dir = normalize(__to_pos - __from_pos);\n\n";
+
+	code += "\t\tfloat __accum = 0.0f;\n";
+	code += "\t\twhile(__accum < __max_dist) {\n";
+	code += "\t\t\tfloat __d = texture_sdf(__at);\n";
+	code += "\t\t\t__accum += __d;\n";
+	code += "\t\t\tif (__d < 0.01f) {\n";
+	code += "\t\t\t\tbreak;\n";
+	code += "\t\t\t}\n";
+	code += "\t\t\t__at += __d * __dir;\n";
+	code += "\t\t}\n";
+
+	code += "\t\tfloat __dist = min(__max_dist, __accum);\n";
+	code += "\t\t" + p_output_vars[0] + " = __dist;\n";
+	code += "\t\t" + p_output_vars[1] + " = __accum < __max_dist;\n";
+	code += "\t\t" + p_output_vars[2] + " = vec3(__from_pos + __dir * __dist, 0.0f);\n";
+
+	code += "\t}\n";
+
+	return code;
+}
+
+VisualShaderNodeSDFRaymarch::VisualShaderNodeSDFRaymarch() {
+	simple_decl = false;
+}