/**************************************************************************/
/*  visual_shader_sdf_nodes.cpp                                           */
/**************************************************************************/
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/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#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_2D;
}

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 p_port == 0 ? PORT_TYPE_VECTOR_2D : PORT_TYPE_SCALAR;
}

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 "		" + p_output_vars[0] + " = sdf_to_screen_uv(" + (p_input_vars[0].is_empty() ? "vec2(0.0)" : p_input_vars[0]) + ");\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_2D;
}

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 p_port == 0 ? PORT_TYPE_VECTOR_2D : PORT_TYPE_SCALAR;
}

String VisualShaderNodeScreenUVToSDF::get_output_port_name(int p_port) const {
	return "";
}

bool VisualShaderNodeScreenUVToSDF::is_input_port_default(int p_port, Shader::Mode p_mode) const {
	if (p_port == 0) {
		return true;
	}
	return false;
}

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 "		" + p_output_vars[0] + " = screen_uv_to_sdf(" + (p_input_vars[0].is_empty() ? "SCREEN_UV" : p_input_vars[0]) + ");\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_2D;
}

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 "		" + p_output_vars[0] + " = texture_sdf(" + (p_input_vars[0].is_empty() ? "vec2(0.0)" : p_input_vars[0]) + ");\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_2D;
}

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 p_port == 0 ? PORT_TYPE_VECTOR_2D : PORT_TYPE_SCALAR;
}

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 "		" + p_output_vars[0] + " = texture_sdf_normal(" + (p_input_vars[0].is_empty() ? "vec2(0.0)" : p_input_vars[0]) + ");\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_2D;
	}
	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_2D;
	}
	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 += "		{\n";

	if (p_input_vars[0].is_empty()) {
		code += "				vec2 __from_pos = vec2(0.0f);\n";
	} else {
		code += "				vec2 __from_pos = " + p_input_vars[0] + ";\n";
	}

	if (p_input_vars[1].is_empty()) {
		code += "				vec2 __to_pos = vec2(0.0f);\n";
	} else {
		code += "				vec2 __to_pos = " + p_input_vars[1] + ";\n";
	}

	code += "\n				vec2 __at = __from_pos;\n";
	code += "				float __max_dist = distance(__from_pos, __to_pos);\n";
	code += "				vec2 __dir = normalize(__to_pos - __from_pos);\n\n";

	code += "				float __accum = 0.0f;\n";
	code += "				while(__accum < __max_dist) {\n";
	code += "						float __d = texture_sdf(__at);\n";
	code += "						__accum += __d;\n";
	code += "						if (__d < 0.01f) {\n";
	code += "								break;\n";
	code += "						}\n";
	code += "						__at += __d * __dir;\n";
	code += "				}\n";

	code += "				float __dist = min(__max_dist, __accum);\n";
	code += "				" + p_output_vars[0] + " = __dist;\n";
	code += "				" + p_output_vars[1] + " = __accum < __max_dist;\n";
	code += "				" + p_output_vars[2] + " = __from_pos + __dir * __dist;\n";

	code += "		}\n";

	return code;
}

VisualShaderNodeSDFRaymarch::VisualShaderNodeSDFRaymarch() {
	simple_decl = false;
}