ETCUncompressedAlpha.cpp File Reference

A sample to show how to use textures with an seperate uncompressed image for alpha. More...

#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <string>
#include <sstream>
#include <jni.h>
#include <android/log.h>
#include "ETCUncompressedAlpha.h"
#include "Shader.h"
#include "Texture.h"
#include "AndroidPlatform.h"

Go to the source code of this file.

Functions
int	loadUncompressedAlpha (const char *filename, GLuint *textureID)
bool	setupGraphics (int w, int h)
void	renderFrame (void)
JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_etcuncompressedalpha_ETCUncompressedAlpha_init (JNIEnv *env, jclass jcls, jint width, jint height)
JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_etcuncompressedalpha_ETCUncompressedAlpha_step (JNIEnv *env, jclass jcls)
JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_etcuncompressedalpha_ETCUncompressedAlpha_uninit (JNIEnv *, jclass)

Variables
string	resourceDirectory = "/data/data/com.arm.malideveloper.openglessdk.etcuncompressedalpha/"
string	textureFilename = "good_uncompressed_mip_"
string	imageExtension = ".pkm"
string	alphaExtension = "_alpha.pgm"
string	vertexShaderFilename = "ETCUncompressedAlpha_dualtex.vert"
string	fragmentShaderFilename = "ETCUncompressedAlpha_dualtex.frag"
GLuint	textureID = 0
GLuint	alphaTextureID = 0
GLuint	programID = 0
GLint	iLocPosition = -1
GLint	iLocTexCoord = -1
GLint	iLocSampler = -1
GLint	iLocAlphaSampler = -1

Detailed Description

A sample to show how to use textures with an seperate uncompressed image for alpha.

ETC does not support alpha channels directly. Here we use a texture which orginally contained an alpha channel but was compressed using the Mali Texture Compression Tool using the "Create seperate uncompressed image" option for alpha handling. This makes an ETC compressed image for the RGB channels and a seperate uncompressed image for the Alpha channel. In this sample both images are loaded and the RGB and Alpha components are merged back together in the fragment shader.

Definition in file ETCUncompressedAlpha.cpp.

Function Documentation

JNIEXPORT void JNICALL Java_com_arm_malideveloper_openglessdk_etcuncompressedalpha_ETCUncompressedAlpha_init	(	JNIEnv *	env,
		jclass	jcls,
		jint	width,
		jint	height
	)

Definition at line 243 of file ETCUncompressedAlpha.cpp.

JNIEXPORT void JNICALL Java_com_arm_malideveloper_openglessdk_etcuncompressedalpha_ETCUncompressedAlpha_step	(	JNIEnv *	env,
		jclass	jcls
	)

Definition at line 266 of file ETCUncompressedAlpha.cpp.

JNIEXPORT void JNICALL Java_com_arm_malideveloper_openglessdk_etcuncompressedalpha_ETCUncompressedAlpha_uninit	(	JNIEnv *	,
		jclass
	)

Definition at line 272 of file ETCUncompressedAlpha.cpp.

int loadUncompressedAlpha	(	const char *	filename,
		GLuint *	textureID
	)

Definition at line 79 of file ETCUncompressedAlpha.cpp.

void renderFrame

(

void

)

Definition at line 219 of file ETCUncompressedAlpha.cpp.

bool setupGraphics	(	int	w,
		int	h
	)

Definition at line 126 of file ETCUncompressedAlpha.cpp.

Variable Documentation

string alphaExtension = "_alpha.pgm"

Definition at line 56 of file ETCUncompressedAlpha.cpp.

GLuint alphaTextureID = 0

Definition at line 63 of file ETCUncompressedAlpha.cpp.

string fragmentShaderFilename = "ETCUncompressedAlpha_dualtex.frag"

Definition at line 59 of file ETCUncompressedAlpha.cpp.

GLint iLocAlphaSampler = -1

Definition at line 70 of file ETCUncompressedAlpha.cpp.

GLint iLocPosition = -1

Definition at line 67 of file ETCUncompressedAlpha.cpp.

GLint iLocSampler = -1

Definition at line 69 of file ETCUncompressedAlpha.cpp.

GLint iLocTexCoord = -1

Definition at line 68 of file ETCUncompressedAlpha.cpp.

string imageExtension = ".pkm"

Definition at line 55 of file ETCUncompressedAlpha.cpp.

GLuint programID = 0

Definition at line 66 of file ETCUncompressedAlpha.cpp.

string resourceDirectory = "/data/data/com.arm.malideveloper.openglessdk.etcuncompressedalpha/"

Definition at line 53 of file ETCUncompressedAlpha.cpp.

string textureFilename = "good_uncompressed_mip_"

Definition at line 54 of file ETCUncompressedAlpha.cpp.

GLuint textureID = 0

Definition at line 62 of file ETCUncompressedAlpha.cpp.

string vertexShaderFilename = "ETCUncompressedAlpha_dualtex.vert"

Definition at line 58 of file ETCUncompressedAlpha.cpp.