Demonstration of ETC2 texture compression support in OpenGL ES 3.0. More...

#include <jni.h>
#include <android/log.h>
#include <GLES3/gl3.h>
#include "Common.h"
#include "ETCHeader.h"
#include "EtcTexture.h"
#include "Matrix.h"
#include "Shader.h"
#include "Text.h"
#include "Texture.h"
#include "Timer.h"

Classes
struct	Image

Functions
void	initializeTexture (int textureIndex)

void	setupTextures ()

void	draw ()

void	setupGraphics (int width, int height)

void	renderFrame (void)

void	uninit ()

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

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

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

Variables
Image	image0

Image	image1

Image	image2

Image	image3

Image	image4

Image	image5

Image	image6

Image	image7

Image	image8

Image	image9

Image	imageArray []

GLuint	bufferObjectIds [2] = {0}

GLuint	currentAssetIndex = 0

const float	displayInterval = 5.0f

GLuint	fragmentShaderId = 0

Text *	internalformatTextDisplayer = NULL

GLint	modelViewMatrixLocation = 0

const int	numberOfTextures = sizeof(imageArray) / sizeof(imageArray[0])

GLint	positionLocation = 0

GLuint	programId = 0

float	scalingFactor = 0.75f

GLint	textureCoordinateLocation = 0

GLint	textureLocation = 0

Timer	timer

int	windowHeight = 0

int	windowWidth = 0

GLuint	vertexShaderId = 0

GLuint	vertexArrayId = 0

float	vertexData []

float	textureCoordinatesData []

Detailed Description

Demonstration of ETC2 texture compression support in OpenGL ES 3.0.

Compressed textures are loaded and displayed on the screen. The internal format of each texture is displayed at the bottom of the screen. The application cycles through all of the texture formats supported by OpenGL ES 3.0.

Formats:

GL_COMPRESSED_R11_EAC: 11 bits for a single channel. Useful for single channel data where higher than 8 bit precision is needed. For example, heightmaps.
GL_COMPRESSED_SIGNED_R11_EAC: Signed version of GL_COMPRESSED_SIGNED_R11_EAC, useful when signed data is needed.
GL_COMPRESSED_RG11_EAC: 11 bits for two channels. Useful for two channel data where higher than 8 bit precision is needed. For example, normalised bump maps, the third component can be reconstructed from the other two components.
GL_COMPRESSED_SIGNED_RG11_EAC: Signed version of GL_COMPRESSED_RG11_EAC, useful when signed data is needed.
GL_COMPRESSED_RGB8_ETC2: 8 bits for three channels. Useful for normal textures without alpha values.
GL_COMPRESSED_SRGB8_ETC2: sRGB version of GL_COMPRESSED_RGB8_ETC2.
GL_COMPRESSED_RGBA8_ETC2_EAC: 8 bits for four channels. Useful for normal textures with varying alpha values.
GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC: sRGB version of GL_COMPRESSED_RGBA8_ETC2_EAC.
GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2: 8 bits for three channels and a 1 bit alpha channel. Useful for normal textures with binary alpha values.
GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2: sRGB version of GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2.

Definition in file Native.cpp.

Function Documentation

void draw ( void )

Draw image and text into back buffer.

Definition at line 267 of file Native.cpp.

void initializeTexture ( int textureIndex )

Generate and fill texture objects with data.

Parameters

textureIndex holds index of an imageArray (indicates which texture is to be created).

Definition at line 169 of file Native.cpp.

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

Definition at line 471 of file Native.cpp.

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

Definition at line 484 of file Native.cpp.

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

Definition at line 477 of file Native.cpp.

void renderFrame ( void )

Render new frame's contents into back buffer.

Definition at line 416 of file Native.cpp.

void setupGraphics	(	int	width,
		int	height
	)

Create program that will be used to rasterize the geometry.

Definition at line 300 of file Native.cpp.

void setupTextures ( )

Initializes data used for rendering.

Definition at line 224 of file Native.cpp.

void uninit ( )

Definition at line 441 of file Native.cpp.

Variable Documentation

GLuint bufferObjectIds[2] = {0}

Definition at line 129 of file Native.cpp.

GLuint currentAssetIndex = 0

Definition at line 130 of file Native.cpp.

const float displayInterval = 5.0f

Definition at line 131 of file Native.cpp.

GLuint fragmentShaderId = 0

Definition at line 132 of file Native.cpp.

Image image0

Initial value:

= {GL_COMPRESSED_R11_EAC,
                TEXTURE_GL_COMPRESSED_R11_EAC_FILE_NAME,
                "GL_COMPRESSED_R11_EAC",
                0}

Definition at line 76 of file Native.cpp.

Image image1

Initial value:

= {GL_COMPRESSED_SIGNED_R11_EAC,
                TEXTURE_GL_COMPRESSED_SIGNED_R11_EAC_FILE_NAME,
                "GL_COMPRESSED_SIGNED_R11_EAC",
                0}

Definition at line 80 of file Native.cpp.

Image image2

Initial value:

= {GL_COMPRESSED_RG11_EAC,
                TEXTURE_GL_COMPRESSED_RG11_EAC_FILE_NAME,
                "GL_COMPRESSED_RG11_EAC",
                0}

Definition at line 84 of file Native.cpp.

Image image3

Initial value:

= {GL_COMPRESSED_SIGNED_RG11_EAC,
                TEXTURE_GL_COMPRESSED_SIGNED_RG11_EAC_FILE_NAME,
                "GL_COMPRESSED_SIGNED_RG11_EAC",
                0}

Definition at line 88 of file Native.cpp.

Image image4

Initial value:

= {GL_COMPRESSED_RGB8_ETC2,
                TEXTURE_GL_COMPRESSED_RGB8_ETC2_FILE_NAME,
                "GL_COMPRESSED_RGB8_ETC2",
                0}

Definition at line 92 of file Native.cpp.

Image image5

Initial value:

= {GL_COMPRESSED_SRGB8_ETC2,
                TEXTURE_GL_COMPRESSED_SRGB8_ETC2_FILE_NAME,
                "GL_COMPRESSED_SRGB8_ETC2",
                0}

Definition at line 96 of file Native.cpp.

Image image6

Initial value:

= {GL_COMPRESSED_RGBA8_ETC2_EAC,
                TEXTURE_GL_COMPRESSED_RGBA8_ETC2_EAC_FILE_NAME,
                "GL_COMPRESSED_RGBA8_ETC2_EAC",
                0}

Definition at line 100 of file Native.cpp.

Image image7

Initial value:

= {GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC,
                TEXTURE_GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC_FILE_NAME,
                "GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC",
                0}

Definition at line 104 of file Native.cpp.

Image image8

Initial value:

= {GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2,
                TEXTURE_GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2_FILE_NAME,
                "GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2",
                0}

Definition at line 108 of file Native.cpp.

Image image9

Initial value:

= {GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2,
                TEXTURE_GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2_FILE_NAME,
                "GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2",
                0}

Definition at line 112 of file Native.cpp.

Image imageArray[]

Initial value:

= {image0,
                      image1,
                      image2,
                      image3,
                      image4,
                      image5,
                      image6,
                      image7,
                      image8,
                      image9}

Definition at line 118 of file Native.cpp.

Text* internalformatTextDisplayer = NULL

Definition at line 133 of file Native.cpp.

GLint modelViewMatrixLocation = 0

Definition at line 134 of file Native.cpp.

const int numberOfTextures = sizeof(imageArray) / sizeof(imageArray[0])

Definition at line 135 of file Native.cpp.

GLint positionLocation = 0

Definition at line 136 of file Native.cpp.

GLuint programId = 0

Definition at line 137 of file Native.cpp.

float scalingFactor = 0.75f

Definition at line 138 of file Native.cpp.

GLint textureCoordinateLocation = 0

Definition at line 139 of file Native.cpp.

float textureCoordinatesData[]

Initial value:

= {0.0f, 1.0f,
                                  1.0f, 1.0f,
                                  0.0f, 0.0f,
                                  0.0f, 0.0f,
                                  1.0f, 1.0f,
                                  1.0f, 0.0f}

Definition at line 157 of file Native.cpp.

GLint textureLocation = 0

Definition at line 140 of file Native.cpp.

Timer timer

Definition at line 141 of file Native.cpp.

GLuint vertexArrayId = 0

Definition at line 145 of file Native.cpp.

float vertexData[]

Initial value:

= {-1.0f, -1.0f, 0.0f,
                       1.0f, -1.0f, 0.0f,
                      -1.0f,  1.0f, 0.0f,
                      -1.0f,  1.0f, 0.0f,
                       1.0f, -1.0f, 0.0f,
                       1.0f,  1.0f, 0.0f}

Definition at line 148 of file Native.cpp.

GLuint vertexShaderId = 0

Definition at line 144 of file Native.cpp.

int windowHeight = 0

Definition at line 142 of file Native.cpp.

int windowWidth = 0

Definition at line 143 of file Native.cpp.

Classes

Functions

Variables

Detailed Description

Function Documentation

Variable Documentation