added skembo plugin

Makefile

@@ -1,5 +1,5 @@
 BIN := $(shell basename $$(pwd))
-PLUGINS := rects
+PLUGINS := rects skembo
 
 MAKE += --no-print-directory
 

skembo/Makefile

@@ -0,0 +1,62 @@
+LIBNAME := $(shell basename $$(pwd))
+MAJOR := 1
+MINOR := 0.0
+
+UNAME_S := $(shell uname -s)
+
+ifeq ($(UNAME_S),Darwin)
+	LINKERNAME := $(LIBNAME).dylib
+	SONAME := $(LIBNAME).$(MAJOR).dylib
+	REALNAME := $(LINKERNAME)
+else
+	LINKERNAME := $(LIBNAME).so
+	SONAME := $(LINKERNAME).$(MAJOR)
+	REALNAME := $(SONAME).$(MINOR)
+endif
+
+PREFIX ?= ..
+LIBDIR ?= $(PREFIX)/plugins
+
+SRCS := $(wildcard *.cpp)
+OBJS := $(subst .cpp,.o,$(SRCS))
+DEPS := $(subst .cpp,.d,$(SRCS))
+HDRS := $(filter-out $(LIBNAME).hpp,$(wildcard *.hpp))
+
+CXX ?= g++
+
+CXXFLAGS := $(CXXFLAGS) -Wshadow -Wall -Wpedantic -Wextra -g -fno-strict-aliasing -std=c++17 -fPIC
+ifeq ($(DEBUG),1)
+	CXXFLAGS += -D DEBUG -O0
+else
+	CXXFLAGS += -D NDEBUG -O3
+endif
+
+LDLIBS := -lcairo -lscscreensaver
+
+RM := /bin/rm -f
+INSTALL := /usr/bin/install -c
+
+.PHONY: all clean install
+
+all: $(REALNAME)
+
+$(REALNAME): $(OBJS) $(DEPS)
+ifeq ($(UNAME_S),Darwin)
+	$(CXX) -dynamiclib -o $(REALNAME) -current_version $(MAJOR) -compatibility_version $(MINOR) $(LDFLAGS) $(LDLIBS) $(OBJS)
+else
+	$(CXX) -g -shared -Wl,-soname,$(SONAME) -o $(REALNAME) $(LDFLAGS) $(LDLIBS) $(OBJS)
+endif
+
+%.o: %.cpp %.d Makefile
+	$(CXX) $(CXXFLAGS) -MMD -MP -MT $@ -MF $*.d -c $<
+
+-include *.d
+
+%.d: ;
+
+clean:
+	$(RM) $(OBJS) $(DEPS) $(REALNAME)
+
+install: $(REALNAME)
+	$(INSTALL) -d $(LIBDIR)
+	$(INSTALL) -m 644 $(REALNAME) $(LIBDIR)/$(LIBNAME).saver

skembo/Skembo.cpp

@@ -0,0 +1,53 @@
+//
+// Skembo.cpp
+// screensaver
+//
+// Created by Bob Polis at 2020-10-26
+// Copyright (c) 2020 SwiftCoder. All rights reserved.
+//
+
+#include "Skembo.hpp"
+#include <libscscreensaver.hpp>
+
+class Skembo : public ScreensaverPlugin {
+    public:
+        Skembo() = default;
+        ~Skembo() = default;
+
+        void setup(cairo_t* context, const cairo_rectangle_t& rect) override;
+        void draw_frame() override;
+        int fps() const override;
+
+    private:
+        double _hue {0};
+};
+
+ScreensaverPlugin* create_instance() {
+    return new Skembo;
+}
+
+void Skembo::setup(cairo_t* context, const cairo_rectangle_t& rect) {
+    ScreensaverPlugin::setup(context, rect);
+    make_black();
+}
+
+int Skembo::fps() const {
+    return 20;
+}
+
+void Skembo::draw_frame() {
+    // std::uniform_real_distribution<double> dist {};
+    HSB hsb;
+    hsb.h = _hue;
+    hsb.s = 1;//dist(_eng);
+    hsb.b = 0.4;//dist(_eng);
+    Color color {hsb};
+    RGB rgb {RGB(color)};
+    cairo_set_source_rgb(_c, rgb.r, rgb.g, rgb.b);
+    cairo_rectangle(_c, _r.x, _r.y, _r.width, _r.height);
+    cairo_fill(_c);
+    _hue += 1.0;
+    if (_hue > 360.0) {
+        _hue = 0.0;
+    }
+}

skembo/Skembo.hpp

@@ -0,0 +1,18 @@
+//
+// Skembo.hpp
+// screensaver
+//
+// Created by Bob Polis at 2020-10-26
+// Copyright (c) 2020 SwiftCoder. All rights reserved.
+//
+
+#ifndef _Skembo_H_
+#define _Skembo_H_
+
+class ScreensaverPlugin;
+
+extern "C" {
+    ScreensaverPlugin* create_instance();
+}
+
+#endif // _Skembo_H_