HELP - 16bit(565) Texture Mapping...

HELP…I am lost…I am trying to figure out if I can use 16bit texture with OpenGL. Everything I read says I can but I am getting no where.

I have texture mapping working but I have to convert all the textures to 24bit(888) format using GL_RGB/GL_UNSIGNED_BYTE as paramters and this all works well.

glTexImage2D(GL_TEXTURE_2D,
0, /* Number of MipMap Levels /
3, /
Blending components /
GL_Texture->x, /
Texture Dimentions /
GL_Texture->y,
0, /
Border Width /
GL_RGB, /
GL_RGB, GL_RGBA, etc… pg. 265 /
GL_UNSIGNED_BYTE, /
Bytes per pixel format */
&GL_Texture->data);

I have tried GL_UNSIGNED_SHORT_5_6_5 as the data type also tried GL_RGB5_A1 ands other combinations but nothing…Anyone have any ideas?

I will also have a need for color index textures but have yet to even attempt that one. I would like to get the 16bit working first but would also appreciate suggestions there…

Thanks in advance…
Bill

Try the following:

glTexImage2D(GL_TEXTURE_2D,
0, /* Number of MipMap Levels /
GL_RGB8, /
internal format, GL_RGB5 would save some memory*/
GL_Texture->x, /* Texture Dimentions /
GL_Texture->y,
0, /
Border Width /
GL_RGB, /
data format /
GL_UNSIGNED_SHORT_5_6_5, /
type */
&GL_Texture->data);

Not working…I have tried this before…I can see the image when I use GL_RGB & GL_UNSIGNED_SHORT but it is scaled wrong (really small, I think it is still looking for 3 bytes per texel) When I use GL_UNSIGNED_SHORT_5_6_5 I get a strange color pattern, which tells me its reading different(possible 2 bytes per texel), I’ll try reviewing the compelte source and see if I missed someting else,

Thanks though…Appreciate the response…Atleast this tells me It can be done…

Originally posted by DFrey:
[b]Try the following:

glTexImage2D(GL_TEXTURE_2D,
0, /* Number of MipMap Levels /
GL_RGB8, /
internal format, GL_RGB5 would save some memory*/
GL_Texture->x, /* Texture Dimentions /
GL_Texture->y,
0, /
Border Width /
GL_RGB, /
data format /
GL_UNSIGNED_SHORT_5_6_5, /
type */
&GL_Texture->data);
[/b]

Check your pixel unpacking settings. Also, you are using OpenGL 1.2 correct?

the above did work at home. The office libGL might be wrong/bad. Will need to do more research here to determinie what GL software libs are here. At home I have GeForce2 and stock drivers and all is well…

THX

Originally posted by DFrey:
Check your pixel unpacking settings. Also, you are using OpenGL 1.2 correct?