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.
