Loading texture to integer internal format resukts in all zeroes

JT9 — Fri, 11 Dec 2015 15:10:36 GMT

Hi all,

I'm using OpenGL to convert video frames from 10-bit YUV420p to 8-bit RGB. YUV frame data is loaded as a texture with:

glTexImage2D(GL_TEXTURE_2D, 0, GL_R16UI, m_frameWidth, m_frameHeight + m_frameHeight / 2, 0, GL_RED_INTEGER, GL_UNSIGNED_SHORT, videoFrame.data());

In the fragment shader it's accessed with:

# version 130

// irrelevant variables definitions here

uniform usampler2D frameTex;

void main()

{

// component value is saved on 10 least significant bits,

// so to normalize it divide by maximum value that can be coded on 10 bits (2^10 - 1 = 1023)

float Y = float(texture(frameTex, vec2(gl_TexCoord[0].s, gl_TexCoord[0].t * YHeight)).r) / 1023.0;

float U = float(texture(frameTex, vec2(gl_TexCoord[0].s / 2, UOffset + gl_TexCoord[0].t * UHeight)).r) / 1023.0;

float V = float(texture(frameTex, vec2(gl_TexCoord[0].s / 2, VOffset + gl_TexCoord[0].t * VHeight)).r) / 1023.0;

gl_FragColor = vec4(HDTV * vec3(Y, U, V), 1.0);

}

Now, all the texels I get with texture() have value (0, 0, 0, 1).

The very same code works when I switch application to use discrete nVidia card.

What would be a problem here?

My system configuration:

Windows 8 64-bit, i7-3740QM with HD Graphics 4000 with driver version 9.17.10.2843 (the newest available for my Lenovo laptop) and discrete nVidia Quadro K1000M.

Re: Loading texture to integer internal format resukts in all zeroes

IUman — Wed, 16 Dec 2015 15:31:04 GMT

Hello jtoma,

Thank you for joining the Intel communities.

You can get better support at the following link:

http://software.intel.com/ http://software.intel.com/

Regards!

Ivan

Re: Loading texture to integer internal format resukts in all zeroes

JT9 — Thu, 17 Dec 2015 10:15:46 GMT

Hello Ivan,

I shall try my chances there then.

Thanks and regards!

topic Loading texture to integer internal format resukts in all zeroes in Graphics

Loading texture to integer internal format resukts in all zeroes

Re: Loading texture to integer internal format resukts in all zeroes

Re: Loading texture to integer internal format resukts in all zeroes