The application simulates cellular automata phenomenon following Rule 30. It uses two programs which operate on two textures used in a ping-pong manner. More...

#include <jni.h>
#include <android/log.h>
#include <GLES3/gl3.h>
#include "Common.h"
#include "CubeModel.h"
#include "Mathematics.h"
#include "Matrix.h"
#include "PlaneModel.h"
#include "IntegerLogic.h"
#include "Shader.h"
#include "Texture.h"
#include "Timer.h"
#include <cstring>

Functions
void	generateRule30Input (unsigned int xoffset, unsigned int width, unsigned int height, unsigned int nComponents, GLvoid **textureData)
	Generates input for Rule 30 Cellular Automaton, setting a white dot in the top line of the texture on the given horizontal offset. More...

void	generateRule30Input (unsigned int width, unsigned int height, unsigned int nComponents, GLvoid **textureData)
	Generates random input for Rule 30 Cellular Automaton, setting random white dots in the top line of the texture. More...

void	performOffscreenRendering ()

void	renderFrame ()

void	renderToBackBuffer ()

void	resetTextures ()

void	setupGraphics (int width, int height)

void	uninit ()

JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_integerLogic_NativeLibrary_init (JNIEnv *env, jobject obj, jint width, jint height)

JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_integerLogic_NativeLibrary_step (JNIEnv *env, jobject obj)

JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_integerLogic_NativeLibrary_uninit (JNIEnv *env, jobject obj)

Variables
GLsizei	windowHeight = 0

GLsizei	windowWidth = 0

GLuint	rule30ProgramID = 0

GLuint	mergeProgramID = 0

const GLuint	pingTextureUnit = 0

const GLuint	pongTextureUnit = 1

GLvoid *	pingTextureData = NULL

GLuint	pingTextureID = -1

GLuint	pongTextureID = -1

GLuint	framebufferID = -1

GLuint	linePositionBOID = -1

GLuint	lineUVBOID = -1

GLuint	quadPositionBOID = 0

GLuint	quadUVBOID = 0

GLuint	lineVAOID = -1

GLuint	quadVAOID = 0

Matrix	modelViewProjectionMatrix

MergeProgramLocations	mergeProgramLocations

Rule30ProgramLocations	rule30ProgramLocations

Timer	timer

const float	timeInterval = 5.0f

Detailed Description

The application simulates cellular automata phenomenon following Rule 30. It uses two programs which operate on two textures used in a ping-pong manner.

The first program takes the ping texture ("ping") as the input and renders the output to a second texture ("pong"). Rendering in this case is performed by drawing one row at a time, with each row having height of 1 pixel and being of screen width. Excluding the first row, each row is drawn by reading one row above the currently processed one and applying the cellular automata rule. The first row's contents are set by the application. Since we cannot draw and read from the same texture at a single time, the drawing is performed one row at a time. After a row is drawn to texture A, the application binds texture B for drawing and uses texture A for reading the previous line. In the end, texture A contains even rows and texture B stores odd rows.

Having finished drawing lines to these two textures, we run another GL program that merges both textures into a single one by using texture A for even lines and texture B for odd ones.

In order to be able to render to a texture, we use a custom frame-buffer.

For the first run, the input line has only one pixel lit, so it generates the commonly known Rule 30 pattern. Then, every 5 seconds, textures are reset and the input is randomly generated.

Definition in file Native.cpp.

Function Documentation

void generateRule30Input	(	unsigned int	xoffset,
		unsigned int	width,
		unsigned int	height,
		unsigned int	nComponents,
		GLvoid **	textureData
	)

Generates input for Rule 30 Cellular Automaton, setting a white dot in the top line of the texture on the given horizontal offset.

Parameters

[in]	xoffset	Horizontal position of the stripe.
[in]	width	Width of the texture.
[in]	height	Height of the texture.
[in]	nComponents	Number of components defining the colors in the texture.
[out]	textureData	Output texture.

Definition at line 161 of file Native.cpp.

void generateRule30Input	(	unsigned int	width,
		unsigned int	height,
		unsigned int	nComponents,
		GLvoid **	textureData
	)

Generates random input for Rule 30 Cellular Automaton, setting random white dots in the top line of the texture.

Parameters

[in]	width	Width of the texture.
[in]	height	Height of the texture.
[in]	nComponents	Number of components defining the colors in the texture.
[out]	textureData	Output texture.

Definition at line 178 of file Native.cpp.

JNIEXPORT void JNICALL Java_com_arm_malideveloper_openglessdk_integerLogic_NativeLibrary_init	(	JNIEnv *	env,
		jobject	obj,
		jint	width,
		jint	height
	)

Definition at line 624 of file Native.cpp.

JNIEXPORT void JNICALL Java_com_arm_malideveloper_openglessdk_integerLogic_NativeLibrary_step	(	JNIEnv *	env,
		jobject	obj
	)

Definition at line 637 of file Native.cpp.

JNIEXPORT void JNICALL Java_com_arm_malideveloper_openglessdk_integerLogic_NativeLibrary_uninit	(	JNIEnv *	env,
		jobject	obj
	)

Definition at line 630 of file Native.cpp.

void performOffscreenRendering ( )

Definition at line 202 of file Native.cpp.

void renderFrame ( void )

Definition at line 572 of file Native.cpp.

void renderToBackBuffer ( )

Definition at line 267 of file Native.cpp.

void resetTextures ( )

Definition at line 585 of file Native.cpp.

void setupGraphics	(	int	width,
		int	height
	)

Definition at line 279 of file Native.cpp.

void uninit ( )

Definition at line 611 of file Native.cpp.

Variable Documentation

GLuint framebufferID = -1

Definition at line 86 of file Native.cpp.

GLuint linePositionBOID = -1

Definition at line 88 of file Native.cpp.

GLuint lineUVBOID = -1

Definition at line 90 of file Native.cpp.

GLuint lineVAOID = -1

Definition at line 96 of file Native.cpp.

GLuint mergeProgramID = 0

Definition at line 69 of file Native.cpp.

MergeProgramLocations mergeProgramLocations

Definition at line 104 of file Native.cpp.

Matrix modelViewProjectionMatrix

Definition at line 101 of file Native.cpp.

GLvoid* pingTextureData = NULL

Definition at line 79 of file Native.cpp.

GLuint pingTextureID = -1

Definition at line 81 of file Native.cpp.

const GLuint pingTextureUnit = 0

Definition at line 73 of file Native.cpp.

GLuint pongTextureID = -1

Definition at line 83 of file Native.cpp.

const GLuint pongTextureUnit = 1

Definition at line 75 of file Native.cpp.

GLuint quadPositionBOID = 0

Definition at line 92 of file Native.cpp.

GLuint quadUVBOID = 0

Definition at line 94 of file Native.cpp.

GLuint quadVAOID = 0

Definition at line 98 of file Native.cpp.

GLuint rule30ProgramID = 0

Definition at line 67 of file Native.cpp.

Rule30ProgramLocations rule30ProgramLocations

Definition at line 106 of file Native.cpp.

const float timeInterval = 5.0f

Definition at line 110 of file Native.cpp.

Timer timer

Definition at line 108 of file Native.cpp.

GLsizei windowHeight = 0

Definition at line 62 of file Native.cpp.

GLsizei windowWidth = 0

Definition at line 64 of file Native.cpp.

Functions

Variables

Detailed Description

Function Documentation

Variable Documentation