ATI: "invalid operation" on glTexImage2D with depth-textures

OpenGL OpenGL: Advanced Coding
1

Hi there

This line

glTexImage2D (GL_TEXTURE_RECTANGLE_EXT, 0, GL_DEPTH_COMPONENT24_ARB, iSizeX, iSizeY, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL);

gives me an “invalid operation” error. Although the texture i get seems to work just fine.

However, in the docs it’s said, that “invalid operation” happens, if it is done between glBegin / glEnd, which is definitely not the case here.

Therefore i really don’t know, why i get this error.

It seems to depend on the GL_DEPTH_COMPONENT stuff. If i call the same routine with GL_RGBA8 i get no errors.

This is on an ATI Radeon 9700 with Catalyst 5.6.

Any ideas?

Jan.

2

Ok, if i set the format parameter to GL_DEPTH_COMPONENT it works. With all other formats i tried it gives me an error.

However,

  1. it should generate a “invalid enum” error, instead of “invalid operation”
  2. if i specify a NULL pointer it should accept any format. I don’t want to put lots of “if internalformat = DEPTH16/24/32 then format = …” into my code, if i specify a NULL pointer anyway.

Jan.

3

GL_BGRA and GL_UNSIGNED_INT_8_8_8_8_REV on a depth texture?

Edit: You figured it out yourself …

Edit2:

  1. Nope, all enums are valid in this call, but you can’t use them together.
  2. The pixels parameter doesn’t matter. The internalformat, format and type combination must still be valid.
4

You have to use a valid combination of internal format and format, even if you pass a null pointer. Read the spec: http://oss.sgi.com/projects/ogl-sample/registry/ARB/depth_texture.txt

“Textures with a base internal format of DEPTH_COMPONENT require depth
component data; textures with other base internal formats require RGBA
component data. The error INVALID_OPERATION is generated if the base
internal format is DEPTH_COMPONENT and format is not DEPTH_COMPONENT,
or if the base internal format is not DEPTH_COMPONENT and format is
DEPTH_COMPONENT.”