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Rendering using OpenGL ES 2.0/3.0 in a zero copy mode on MALI T628

I am looking for example / articles on how to perform updates to an Open GL ES texture (without using low Performing glTexSubImage2D approach) in a zero copy approach.

I am currently focused on odroid XU3 with MALI T628 running ubuntu.

I studied and tried eglcreateImageKHR approach without success (I cannot create an eglImage: error EGL_BAD_PARAMETER is returned when using EGL_NATIVE_PIXMAP_KHRas a target).

I read that MALI driver has support for UMP data transfer, but I still need a reference to the inner buffer in a openGL ES texture.

Any help needed

Andrea

Parents

andrea over 9 years ago in reply to andrea

I tried fbdev user space driver on xu3.

Issues:

1) There is a unacceptable tear-off effect, even with a very simple texture.

2) no way to create an an EGLImage

	fbdev_pixmap pm;
	pm.height = HEIGHT;
	pm.width = WIDTH;
	pm.bytes_per_pixel = 32;
	pm.red_size = 8;
	pm.green_size = 8;
	pm.blue_size = 8;
	pm.alpha_size = 8;
	pm.luminance_size = 0;
	pm.flags = FBDEV_PIXMAP_SUPPORTS_UMP;
	pm.data = (unsigned short*)TexData;

	const EGLint img_attribs[] = {
		EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
		EGL_NONE
	};

	static EGLImageKHR g_eglImage = 0;
	if (g_eglImage)
		eglDestroyImageKHR(g_sEGLDisplay, g_eglImage);
	g_eglImage = eglCreateImageKHR(g_sEGLDisplay, EGL_NO_CONTEXT, EGL_NATIVE_PIXMAP_KHR, (EGLClientBuffer)&pm, img_attribs);
	EGLint eglError = eglGetError(); ==> 0x300c

Reply

andrea over 9 years ago in reply to andrea

I tried fbdev user space driver on xu3.

Issues:

1) There is a unacceptable tear-off effect, even with a very simple texture.

2) no way to create an an EGLImage

	fbdev_pixmap pm;
	pm.height = HEIGHT;
	pm.width = WIDTH;
	pm.bytes_per_pixel = 32;
	pm.red_size = 8;
	pm.green_size = 8;
	pm.blue_size = 8;
	pm.alpha_size = 8;
	pm.luminance_size = 0;
	pm.flags = FBDEV_PIXMAP_SUPPORTS_UMP;
	pm.data = (unsigned short*)TexData;

	const EGLint img_attribs[] = {
		EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
		EGL_NONE
	};

	static EGLImageKHR g_eglImage = 0;
	if (g_eglImage)
		eglDestroyImageKHR(g_sEGLDisplay, g_eglImage);
	g_eglImage = eglCreateImageKHR(g_sEGLDisplay, EGL_NO_CONTEXT, EGL_NATIVE_PIXMAP_KHR, (EGLClientBuffer)&pm, img_attribs);
	EGLint eglError = eglGetError(); ==> 0x300c

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