To upload, the only way seems to be
glTexImage2D(target, 0, GL_RGBAF16_ARB, w, h, 0, GL_RGBA, GL_HALF_FLOAT_NV, pixels);
I`m not sure why GL_HALF_FLOAT_NV hasn`t been inserted into ARB_texture_float.
I guess the alternative is GL_FLOAT but I`m pretty sure that means 32 bit float.
------------------------------
Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);
![sqrt[-1]'s Avatar](assets/customavatars/avatar5811_2.gif "sqrt[-1]'s Avatar"){kind=avatar}
It would also be nice to have some GLU functions to convert from float->half and half->float.
@ V-man: Try GL_HALF_FLOAT_ARB
@ sqrt[-1]: do you know the OpenEXR library? It provides float <-> half conversions
I just found out about ARB_half_float_pixel which has GL_HALF_FLOAT_ARB. I don't see why they have designed it like this.
ARB_texture_float should just offer GL_HALF_FLOAT_ARB
or better yet,
ARB_texture_float (for 32 bit, if GPU can do it)
and
ARB_texture_halffloat (if GPU can do it)
and perhaps someday they can make
ARB_texture_double
PS: GLU should be updated IMO.
------------------------------
Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);
gluBuild*Mipmaps should support half/float.
No need. Mipmap generation is a requirement since a long time ago so the GL drivers can generate mipmaps.Originally Posted by arekkusu
------------------------------
Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);
The only reason i could think why they didn't include GL_HALF_FLOAT_ARB in ARB_texture_float is, Nvidia was supporting half filtering from the begining and ATI wasn't (still?), without half filtering maybe GL_HALF_FLOAT_ARB pointless?
Nvidia and OpenEXR both use same library.
But why would you need a conversion if you can't upload results to gpu? And if you can upload, you can convert your data to any format using shader, you wouldn't need any other extension/library/GLU function.
That doesn't do me any good when I have a 20k x 20k float image to upload.
gluScaleImage / gluBuild*Mipmaps should support half/float. So we can prepare data for GL on the CPU.
Not that I agree or disagree with the upgrade to GLU, but what does that have to do with GL being on the CPU? The two things seem to be rather orthogonal.gluScaleImage / gluBuild*Mipmaps should support half/float. So we can prepare data for GL on the CPU.
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