adding example

.gitignore

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+# Some general ignore patterns
+build/
+obj/
+*.o
+Debug*/
+Release*/
+*.mode*
+*.app/
+*.pyc
+.svn/
+
+#VisualCode
+.vscode/browse.db*
+
+#XCode
+*.pbxuser
+*.perspective
+*.perspectivev3
+*.mode1v3
+*.mode2v3
+#XCode 4
+xcuserdata
+*.xcworkspace
+
+#Code::Blocks
+*.depend
+*.layout
+
+#Visual Studio
+*.sdf
+*.opensdf
+*.suo
+ipch/
+
+#Eclipse
+.metadata
+local.properties
+.externalToolBuilders
+
+
+# OS-specific ignore patterns
+
+#Linux
+*~
+# KDE
+.directory
+
+#OSX
+.DS_Store
+*.swp
+*~.nib
+# Thumbnails
+._*
+
+#Windows
+# Windows image file caches
+Thumbs.db
+# Folder config file
+Desktop.ini
+
+#Android
+.csettings
+/libs/openFrameworksCompiled/project/android/paths.make
+
+# Miscellaneous
+.mailmap
+
+nohup.out
+bin/Serial
+bin/libfmodex.so
+

examples/multiple_buffers/Makefile

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+# Attempt to load a config.make file.
+# If none is found, project defaults in config.project.make will be used.
+ifneq ($(wildcard config.make),)
+	include config.make
+endif
+
+# make sure the the OF_ROOT location is defined
+ifndef OF_ROOT
+	OF_ROOT=$(realpath ../../../../../..)
+endif
+
+# call the project makefile!
+include $(OF_ROOT)/libs/openFrameworksCompiled/project/makefileCommon/compile.project.mk

examples/multiple_buffers/Project.xcconfig

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+//THE PATH TO THE ROOT OF OUR OF PATH RELATIVE TO THIS PROJECT.
+//THIS NEEDS TO BE DEFINED BEFORE CoreOF.xcconfig IS INCLUDED
+OF_PATH = ../../../..
+
+//THIS HAS ALL THE HEADER AND LIBS FOR OF CORE
+#include "../../../../libs/openFrameworksCompiled/project/osx/CoreOF.xcconfig"
+
+//ICONS - NEW IN 0072 
+ICON_NAME_DEBUG = icon-debug.icns
+ICON_NAME_RELEASE = icon.icns
+ICON_FILE_PATH = $(OF_PATH)/libs/openFrameworksCompiled/project/osx/
+
+//IF YOU WANT AN APP TO HAVE A CUSTOM ICON - PUT THEM IN YOUR DATA FOLDER AND CHANGE ICON_FILE_PATH to:
+//ICON_FILE_PATH = bin/data/
+
+OTHER_CFLAGS = $(OF_CORE_CFLAGS)
+OTHER_LDFLAGS = $(OF_CORE_LIBS) $(OF_CORE_FRAMEWORKS)
+HEADER_SEARCH_PATHS = $(OF_CORE_HEADERS)

examples/multiple_buffers/addons.make

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+ofxShader

examples/multiple_buffers/bin/data/grayscott.frag

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+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform sampler2D   u_buffer0;
+uniform sampler2D   u_buffer1;
+
+uniform vec2        u_resolution;
+uniform vec2        u_mouse;
+uniform float       u_time;
+
+varying vec2        v_texcoord;
+
+#define ITERATIONS 9
+
+float diffU = 0.25;
+float diffV = 0.05;
+float f = 0.1;
+float k = 0.063;
+
+float random (in float x) {
+    return fract(sin(x)*43758.5453123);
+}
+
+float random (vec2 st) {
+    return fract(sin(dot(st.xy, vec2(12.9898,78.233)))*43758.5453123);
+}
+
+void main() {
+    vec2 st = v_texcoord;
+    // st.y = 1.0 - st.y;
+
+#ifdef BUFFER_0
+    // PING BUFFER
+    //
+    //  Note: Here is where most of the action happens. But need's to read
+    //  te content of the previous pass, for that we are making another buffer
+    //  BUFFER_1 (u_buffer1)
+    vec2 pixel = 1./u_resolution;
+
+    float kernel[9];
+    kernel[0] = 0.707106781;
+    kernel[1] = 1.0;
+    kernel[2] = 0.707106781;
+    kernel[3] = 1.0;
+    kernel[4] = -6.82842712;
+    kernel[5] = 1.0;
+    kernel[6] = 0.707106781;
+    kernel[7] = 1.0;
+    kernel[8] = 0.707106781;
+
+    vec2 offset[9];
+    offset[0] = pixel * vec2(-1.0,-1.0);
+    offset[1] = pixel * vec2( 0.0,-1.0);
+    offset[2] = pixel * vec2( 1.0,-1.0);
+
+    offset[3] = pixel * vec2(-1.0,0.0);
+    offset[4] = pixel * vec2( 0.0,0.0);
+    offset[5] = pixel * vec2( 1.0,0.0);
+
+    offset[6] = pixel * vec2(-1.0,1.0);
+    offset[7] = pixel * vec2( 0.0,1.0);
+    offset[8] = pixel * vec2( 1.0,1.0);
+
+    vec2 texColor = texture2D(u_buffer1, st).rb;
+
+    vec2 uv = st;
+    float t = u_time;
+    uv -= u_mouse/u_resolution;
+    float pct = random(u_time);
+    float srcTexColor = smoothstep(.999+pct*0.0001,1.,1.-dot(uv,uv))*random(st)*pct;
+
+    vec2 lap = vec2(0.0);
+
+    for (int i=0; i < ITERATIONS; i++){
+        vec2 tmp = texture2D(u_buffer1, st + offset[i]).rb;
+        lap += tmp * kernel[i];
+    }
+
+    float F  = f + srcTexColor * 0.025 - 0.0005;
+    float K  = k + srcTexColor * 0.025 - 0.0005;
+
+    float u  = texColor.r;
+    float v  = texColor.g + srcTexColor * 0.5;
+
+    float uvv = u * v * v;
+
+    float du = diffU * lap.r - uvv + F * (1.0 - u);
+    float dv = diffV * lap.g + uvv - (F + K) * v;
+
+    u += du * 0.6;
+    v += dv * 0.6;
+
+    gl_FragColor = vec4(clamp( u, 0.0, 1.0 ), 1.0 - u/v ,clamp( v, 0.0, 1.0 ), 1.0);
+
+#elif defined( BUFFER_1 )
+    // PONG BUFFER
+    //
+    //  Note: Just copy the content of the BUFFER0 so it can be 
+    //  read by it in the next frame
+    //
+    gl_FragColor = texture2D(u_buffer0, st);
+#else
+    // Main Buffer
+    vec3 color = vec3(0.0);
+    color = texture2D(u_buffer1, st).rgb;
+    // color.r = 1.;
+
+    gl_FragColor = vec4(color, 1.0);
+#endif
+}

examples/multiple_buffers/config.make

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+################################################################################
+# CONFIGURE PROJECT MAKEFILE (optional)
+#   This file is where we make project specific configurations.
+################################################################################
+
+################################################################################
+# OF ROOT
+#   The location of your root openFrameworks installation
+#       (default) OF_ROOT = ../../../../../.. 
+################################################################################
+# OF_ROOT = ../../../../../..
+
+################################################################################
+# PROJECT ROOT
+#   The location of the project - a starting place for searching for files
+#       (default) PROJECT_ROOT = . (this directory)
+#    
+################################################################################
+# PROJECT_ROOT = .
+
+################################################################################
+# PROJECT SPECIFIC CHECKS
+#   This is a project defined section to create internal makefile flags to 
+#   conditionally enable or disable the addition of various features within 
+#   this makefile.  For instance, if you want to make changes based on whether
+#   GTK is installed, one might test that here and create a variable to check. 
+################################################################################
+# None
+
+################################################################################
+# PROJECT EXTERNAL SOURCE PATHS
+#   These are fully qualified paths that are not within the PROJECT_ROOT folder.
+#   Like source folders in the PROJECT_ROOT, these paths are subject to 
+#   exlclusion via the PROJECT_EXLCUSIONS list.
+#
+#     (default) PROJECT_EXTERNAL_SOURCE_PATHS = (blank) 
+#
+#   Note: Leave a leading space when adding list items with the += operator
+################################################################################
+# PROJECT_EXTERNAL_SOURCE_PATHS = 
+
+################################################################################
+# PROJECT EXCLUSIONS
+#   These makefiles assume that all folders in your current project directory 
+#   and any listed in the PROJECT_EXTERNAL_SOURCH_PATHS are are valid locations
+#   to look for source code. The any folders or files that match any of the 
+#   items in the PROJECT_EXCLUSIONS list below will be ignored.
+#
+#   Each item in the PROJECT_EXCLUSIONS list will be treated as a complete 
+#   string unless teh user adds a wildcard (%) operator to match subdirectories.
+#   GNU make only allows one wildcard for matching.  The second wildcard (%) is
+#   treated literally.
+#
+#      (default) PROJECT_EXCLUSIONS = (blank)
+#
+#		Will automatically exclude the following:
+#
+#			$(PROJECT_ROOT)/bin%
+#			$(PROJECT_ROOT)/obj%
+#			$(PROJECT_ROOT)/%.xcodeproj
+#
+#   Note: Leave a leading space when adding list items with the += operator
+################################################################################
+# PROJECT_EXCLUSIONS =
+
+################################################################################
+# PROJECT LINKER FLAGS
+#	These flags will be sent to the linker when compiling the executable.
+#
+#		(default) PROJECT_LDFLAGS = -Wl,-rpath=./libs
+#
+#   Note: Leave a leading space when adding list items with the += operator
+#
+# Currently, shared libraries that are needed are copied to the 
+# $(PROJECT_ROOT)/bin/libs directory.  The following LDFLAGS tell the linker to
+# add a runtime path to search for those shared libraries, since they aren't 
+# incorporated directly into the final executable application binary.
+################################################################################
+# PROJECT_LDFLAGS=-Wl,-rpath=./libs
+
+################################################################################
+# PROJECT DEFINES
+#   Create a space-delimited list of DEFINES. The list will be converted into 
+#   CFLAGS with the "-D" flag later in the makefile.
+#
+#		(default) PROJECT_DEFINES = (blank)
+#
+#   Note: Leave a leading space when adding list items with the += operator
+################################################################################
+# PROJECT_DEFINES = 
+
+################################################################################
+# PROJECT CFLAGS
+#   This is a list of fully qualified CFLAGS required when compiling for this 
+#   project.  These CFLAGS will be used IN ADDITION TO the PLATFORM_CFLAGS 
+#   defined in your platform specific core configuration files. These flags are
+#   presented to the compiler BEFORE the PROJECT_OPTIMIZATION_CFLAGS below. 
+#
+#		(default) PROJECT_CFLAGS = (blank)
+#
+#   Note: Before adding PROJECT_CFLAGS, note that the PLATFORM_CFLAGS defined in 
+#   your platform specific configuration file will be applied by default and 
+#   further flags here may not be needed.
+#
+#   Note: Leave a leading space when adding list items with the += operator
+################################################################################
+# PROJECT_CFLAGS = 
+
+################################################################################
+# PROJECT OPTIMIZATION CFLAGS
+#   These are lists of CFLAGS that are target-specific.  While any flags could 
+#   be conditionally added, they are usually limited to optimization flags. 
+#   These flags are added BEFORE the PROJECT_CFLAGS.
+#
+#   PROJECT_OPTIMIZATION_CFLAGS_RELEASE flags are only applied to RELEASE targets.
+#
+#		(default) PROJECT_OPTIMIZATION_CFLAGS_RELEASE = (blank)
+#
+#   PROJECT_OPTIMIZATION_CFLAGS_DEBUG flags are only applied to DEBUG targets.
+#
+#		(default) PROJECT_OPTIMIZATION_CFLAGS_DEBUG = (blank)
+#
+#   Note: Before adding PROJECT_OPTIMIZATION_CFLAGS, please note that the 
+#   PLATFORM_OPTIMIZATION_CFLAGS defined in your platform specific configuration 
+#   file will be applied by default and further optimization flags here may not 
+#   be needed.
+#
+#   Note: Leave a leading space when adding list items with the += operator
+################################################################################
+# PROJECT_OPTIMIZATION_CFLAGS_RELEASE = 
+# PROJECT_OPTIMIZATION_CFLAGS_DEBUG = 
+
+################################################################################
+# PROJECT COMPILERS
+#   Custom compilers can be set for CC and CXX
+#		(default) PROJECT_CXX = (blank)
+#		(default) PROJECT_CC = (blank)
+#   Note: Leave a leading space when adding list items with the += operator
+################################################################################
+# PROJECT_CXX = 
+# PROJECT_CC = 

examples/multiple_buffers/icon.rc

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+// Icon Resource Definition
+#define MAIN_ICON                       102
+
+#if defined(_DEBUG)
+MAIN_ICON               ICON                    "icon_debug.ico"
+#else
+MAIN_ICON               ICON                    "icon.ico"
+#endif