EGLPreserve.cpp File Reference

A sample to show how to use glScissor() and EGL_SWAP_BEHAVIOUR. More...

#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <EGL/egl.h>
#include <string>
#include <jni.h>
#include <android/log.h>
#include <sys/time.h>
#include "EGLPreserve.h"
#include "Text.h"
#include "Shader.h"
#include "Texture.h"
#include "Matrix.h"
#include "Platform.h"
#include "Timer.h"
#include "AndroidPlatform.h"

Go to the source code of this file.

Functions
bool	setupGraphics (int width, int height)
void	renderFrame (void)
JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_eglpreserve_EGLPreserve_init (JNIEnv *env, jclass jcls, jint width, jint height)
JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_eglpreserve_EGLPreserve_step (JNIEnv *env, jclass jcls)
JNIEXPORT void JNICALL	Java_com_arm_malideveloper_openglessdk_eglpreserve_EGLPreserve_uninit (JNIEnv *, jclass)

Variables
string	resourceDirectory = "/data/data/com.arm.malideveloper.openglessdk.eglpreserve/"
string	vertexShaderFilename = "EGLPreserve_cube.vert"
string	fragmentShaderFilename = "EGLPreserve_cube.frag"
string	scissorOff = "Scissor: off"
string	scissorOn = "Scissor: on "
string	preserveOff = "Preserve: off"
string	preserveOn = "Preserve: on "
GLuint	programID = 0
GLint	iLocPosition = -1
GLint	iLocFillColor = -1
GLint	iLocProjection = -1
GLint	iLocModelview = -1
Matrix	perspective
Matrix	translation
unsigned int	windowWidth = 0
unsigned int	windowHeight = 0
Timer	animationTimer
Text *	text

Detailed Description

A sample to show how to use glScissor() and EGL_SWAP_BEHAVIOUR.

The sample changes between three states:

running with scissoring on and EGL_SWAP_BEHAVIOUR set to EGL_BUFFER_PRESERVED

running with scissoring on and EGL_SWAP_BEHAVIOUR set to EGL_BUFFER_DESTROYED

running with scissoring off

Scissoring specifies a rectangle on screen, only ares inside that rectangle are then affected by draw calls. When EGL_SWAP_BEHAVIOUR is set to EGL_BUFFER_PRESERVED the contents of the color buffer are preserved when eglSwapBuffers() is called. When EGL_SWAP_BEHAVIOUR is set to EGL_BUFFER_DESTROYED the contents of the color buffer could be destroyed or modified by eglSwapBuffers(). The effect is that in case 1 above the left half of the cube is preserved (not moving) in the color buffer while the right halve is updated (keeps spinning). In case 2 the left the left half of the screen is cleared and the right half is updated.

Definition in file EGLPreserve.cpp.

Function Documentation

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

Definition at line 310 of file EGLPreserve.cpp.

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

Definition at line 323 of file EGLPreserve.cpp.

JNIEXPORT void JNICALL Java_com_arm_malideveloper_openglessdk_eglpreserve_EGLPreserve_uninit	(	JNIEnv *	,
		jclass
	)

Definition at line 329 of file EGLPreserve.cpp.

void renderFrame

(

void

)

Definition at line 207 of file EGLPreserve.cpp.

bool setupGraphics	(	int	width,
		int	height
	)

Definition at line 93 of file EGLPreserve.cpp.

Variable Documentation

Timer animationTimer

Definition at line 88 of file EGLPreserve.cpp.

string fragmentShaderFilename = "EGLPreserve_cube.frag"

Definition at line 66 of file EGLPreserve.cpp.

GLint iLocFillColor = -1

Definition at line 76 of file EGLPreserve.cpp.

GLint iLocModelview = -1

Definition at line 78 of file EGLPreserve.cpp.

GLint iLocPosition = -1

Definition at line 75 of file EGLPreserve.cpp.

GLint iLocProjection = -1

Definition at line 77 of file EGLPreserve.cpp.

Matrix perspective

Definition at line 81 of file EGLPreserve.cpp.

string preserveOff = "Preserve: off"

Definition at line 70 of file EGLPreserve.cpp.

string preserveOn = "Preserve: on "

Definition at line 71 of file EGLPreserve.cpp.

GLuint programID = 0

Definition at line 74 of file EGLPreserve.cpp.

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

Definition at line 64 of file EGLPreserve.cpp.

string scissorOff = "Scissor: off"

Definition at line 68 of file EGLPreserve.cpp.

string scissorOn = "Scissor: on "

Definition at line 69 of file EGLPreserve.cpp.

Text* text

Definition at line 91 of file EGLPreserve.cpp.

Matrix translation

Definition at line 82 of file EGLPreserve.cpp.

string vertexShaderFilename = "EGLPreserve_cube.vert"

Definition at line 65 of file EGLPreserve.cpp.

unsigned int windowHeight = 0

Definition at line 85 of file EGLPreserve.cpp.

unsigned int windowWidth = 0

Definition at line 84 of file EGLPreserve.cpp.