How to update Texture?

[Xana Hopper]

Now I'm generate some pixels in per frame and upload it to Texture which is already created.

unsigned short * data;

shared_ptr<GLPixelTransferBuffer> TBuffer = PackedNoise->toPixelTransferBuffer();

data = (unsigned short *)(TBuffer->mapReadWrite());

int offset = t * NPackSizeSq;

for(int i = 0; i < NPackSizeSq; ++i)

{

data[i] = 32768 + PackedNoisePtr[i + offset]; //Here PackedNoisePtr is a pointer to int;

}

TBuffer->unmap();

TBuffer->bindRead();

//This place should be glTexSubIImage2D that Texture::update use to upload data to GPU but I

//don't know how to do it. Like this?

//glTexSubImage2D(PackedNoise->openGLTextureTarget(), 0, 0, 0, PackedNoise->width(), PackedNoise->height(), PackedNoise->format()->openGLBaseFormat, PackedNoise->format()->openGLDataFormat, 0);

//Or just do something to update it from Image1\Image3\Image4. I found that GLPixelTransferBuffer can just be convert to Image class but it doesn't work.

TBuffer->unbindRead();

[Morgan McGuire]

To update a texture...call Texture::update()

-m

Prof. Morgan McGuire
Computer Science Department
Williams College
http://cs.williams.edu/~morgan

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[Xana Hopper]

I found Texture::update() method. But I don't know how to use it. I modifed Texture by using Texture::toPixelTransferBuffer(). the update method require a ImageRef

that I don't know how to convert GLPixelTransferBuffer to any of Image1\Image3\Image4...

在 2013年5月18日星期六UTC+8下午10时55分19秒，Morgan McGuire写道：

[Morgan McGuire]

Image1/3/4 are deprecated--use Image instead.

-m

Prof. Morgan McGuire
Computer Science Department
Williams College
http://cs.williams.edu/~morgan

[Xana Hopper]

But update mathod needs getCArray() and Image doesn't have it.

在 2013年5月19日星期日UTC+8上午9时15分15秒，Morgan McGuire写道：

[Michael Mara]

This is the Texture::update code from the latest svn revision (it must have got put in right after the 9.00 beta 4 release...)

void Texture::update(const shared_ptr<PixelTransferBuffer>& src, int mipLevel, CubeFace face) {

    alwaysAssertM(format()->openGLBaseFormat == src->format()->openGLBaseFormat,

                    "Data must have the same number of channels as the texture: this = " + format()->name() + 

                    "  src = " + src->format()->name());

    const shared_ptr<GLPixelTransferBuffer>& glsrc = dynamic_pointer_cast<GLPixelTransferBuffer>(src);

    glPushAttrib(GL_TEXTURE_BIT);

    {

        glBindTexture(openGLTextureTarget(), openGLID());

        glPixelStorei(GL_PACK_ALIGNMENT, 1);

            

        const GLint xoffset = 0;

        const GLint yoffset = 0;

            

        GLenum target = openGLTextureTarget();

        if (isCubeMap()) {

            target = GL_TEXTURE_CUBE_MAP_POSITIVE_X + (int)face;

        }

        const void* ptr = NULL;

        if (notNull(glsrc)) {

            // Bind directly instead of invoking bindRead(); see below for discussion

            glBindBuffer(GL_PIXEL_UNPACK_BUFFER, glsrc->glBufferID());

            // The pointer is an offset in this case

            ptr = 0;

        } else {

            // Regular path

            ptr = src->mapRead();

        }

            

        glTexSubImage2D

            (target, 

                mipLevel,

                xoffset,

                yoffset,

                src->width(), 

                src->height(), 

                src->format()->openGLBaseFormat,

                src->format()->openGLDataFormat, 

                ptr);

        if (notNull(glsrc)) {

            // Creating the fence for this operation is VERY expensive because it causes a pipeline stall [on NVIDIA GPUs],

            // so we directly unbind the buffer instead of creating a fence.

            glBindBuffer(GL_PIXEL_UNPACK_BUFFER, GL_NONE);

        } else {

            // We mapped the non-GL PTB, so unmap it 

            src->unmap();

        }

    }

    glPopAttrib();

}

[Gmail]

Thanks a lot and may I ask when could we get G3D v9.0 Release ?

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Xana Hopper

NAEI

Yantai, Shandong, China