Native.cpp File Reference

Demonstration of instanced drawing and uniform buffers in OpenGL ES 3.0. More...

#include <jni.h>
#include <android/log.h>
#include <GLES3/gl3.h>
#include "Common.h"
#include "CubeModel.h"
#include "Instancing.h"
#include "Shader.h"
#include "Timer.h"
#include <cstring>

Go to the source code of this file.

Functions
void	generateStartPosition ()
	Generate positions of cubes which are used during first draw call. More...
void	fillCubeColorsArray ()
	Fill cubeColors array with random color (used for setting random color for each cube). More...
void	fillVertexColorsArray ()
void	createCubesData ()
void	initializeData ()
void	setupProgram ()
void	renderFrame ()
	Render new frame's contents into back buffer. More...
void	setupGraphics (int width, int height)
void	uninit ()
JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_instancing_NativeLibrary_init (JNIEnv *env, jobject obj, jint width, jint height)
JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_instancing_NativeLibrary_step (JNIEnv *env, jobject obj)
JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_instancing_NativeLibrary_uninit (JNIEnv *env, jobject obj)

Variables
Timer	timer
GLuint	fragmentShaderId = 0
GLuint	vertexShaderId = 0
GLuint	renderingProgramId = 0
int	numberOfCubeTriangleCoordinates = 0
int	numberOfCubeVertices = 0
float *	cubeTrianglesCoordinates = NULL
int	numberOfValuesInVertexColorsArray = 0
GLfloat *	vertexColors = NULL
const int	numberOfValuesInCubeColorsArray = NUMBER_OF_COLOR_COMPONENTS * NUMBER_OF_CUBES
GLfloat	cubeColors [numberOfValuesInCubeColorsArray] = {0}
const float	cubeSize = 2.5f
GLint	cameraPositionLocation = 0
GLuint	uniformBlockIndex = 0
GLint	perspectiveMatrixLocation = 0
GLint	positionLocation = 0
GLint	cubeVertexColorLocation = 0
GLint	timeLocation = 0
const GLuint	numberOfBufferObjectIds = 3
GLuint	bufferObjectIds [numberOfBufferObjectIds] = {0}
GLuint	cubeColorsBufferObjectId = 0
GLuint	cubeCoordinatesBufferObjectId = 0
GLuint	uniformBlockDataBufferObjectId = 0
GLfloat	startPosition [NUMBER_OF_CUBES] = {0}
Vec4f	perspectiveVector
Vec3f	cameraVector

Detailed Description

Demonstration of instanced drawing and uniform buffers in OpenGL ES 3.0.

There is only one copy of the cube vertex data in memory, each of the cubes drawn is an instance of that data. This reduces the amount of memory which needs to be transferred to the GPU. By using gl_instanceID in the shader, each of the cubes can have a different position, rotation speed and colour. This technique can be used everywhere repeated geometry is used in a scene.

Definition in file Native.cpp.

Function Documentation

void createCubesData

(

)

Initialize data for cubes.

Definition at line 173 of file Native.cpp.

void fillCubeColorsArray

(

)

Fill cubeColors array with random color (used for setting random color for each cube).

Definition at line 137 of file Native.cpp.

void fillVertexColorsArray

(

)

Definition at line 152 of file Native.cpp.

void generateStartPosition

(

)

Generate positions of cubes which are used during first draw call.

Note

Cubes are located on a circular curve.

Definition at line 121 of file Native.cpp.

void initializeData

(

)

Definition at line 200 of file Native.cpp.

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

Definition at line 440 of file Native.cpp.

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

Definition at line 453 of file Native.cpp.

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

Definition at line 446 of file Native.cpp.

void renderFrame

(

void

)

Render new frame's contents into back buffer.

Definition at line 325 of file Native.cpp.

void setupGraphics	(	int	width,
		int	height
	)

Definition at line 346 of file Native.cpp.

void setupProgram

(

)

Definition at line 273 of file Native.cpp.

void uninit

(

)

Definition at line 412 of file Native.cpp.

Variable Documentation

GLuint bufferObjectIds[numberOfBufferObjectIds] = {0}

Definition at line 93 of file Native.cpp.

GLint cameraPositionLocation = 0

Definition at line 73 of file Native.cpp.

Vec3f cameraVector

Definition at line 114 of file Native.cpp.

GLfloat cubeColors[numberOfValuesInCubeColorsArray] = {0}

Definition at line 67 of file Native.cpp.

GLuint cubeColorsBufferObjectId = 0

Definition at line 95 of file Native.cpp.

GLuint cubeCoordinatesBufferObjectId = 0

Definition at line 97 of file Native.cpp.

const float cubeSize = 2.5f

Definition at line 69 of file Native.cpp.

float* cubeTrianglesCoordinates = NULL

Definition at line 59 of file Native.cpp.

GLint cubeVertexColorLocation = 0

Definition at line 81 of file Native.cpp.

GLuint fragmentShaderId = 0

Definition at line 47 of file Native.cpp.

const GLuint numberOfBufferObjectIds = 3

Definition at line 91 of file Native.cpp.

int numberOfCubeTriangleCoordinates = 0

Definition at line 55 of file Native.cpp.

int numberOfCubeVertices = 0

Definition at line 57 of file Native.cpp.

const int numberOfValuesInCubeColorsArray = NUMBER_OF_COLOR_COMPONENTS * NUMBER_OF_CUBES

Definition at line 65 of file Native.cpp.

int numberOfValuesInVertexColorsArray = 0

Definition at line 61 of file Native.cpp.

GLint perspectiveMatrixLocation = 0

Definition at line 77 of file Native.cpp.

Vec4f perspectiveVector

Definition at line 112 of file Native.cpp.

GLint positionLocation = 0

Definition at line 79 of file Native.cpp.

GLuint renderingProgramId = 0

Definition at line 51 of file Native.cpp.

GLfloat startPosition[NUMBER_OF_CUBES] = {0}

Definition at line 103 of file Native.cpp.

GLint timeLocation = 0

Definition at line 83 of file Native.cpp.

Timer timer

Definition at line 44 of file Native.cpp.

GLuint uniformBlockDataBufferObjectId = 0

Definition at line 99 of file Native.cpp.

GLuint uniformBlockIndex = 0

Definition at line 75 of file Native.cpp.

GLfloat* vertexColors = NULL

Definition at line 63 of file Native.cpp.

GLuint vertexShaderId = 0

Definition at line 49 of file Native.cpp.