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It should be quite acceptable to use a texture without defining any texture coords. For example a shader may be in use that is doing texture lookups without referencing the texture coordinates. Also it should be possible to replace the vertex colors using a texture layer without a texture but with a constant layer color. enable_state_for_drawing_buffer no longer sets any disabled layers in the overrides. Instead of counting the number of units with texture coordinates it now keeps them in a mask. This means there can now be gaps in the list of enabled texture coordinate arrays. To cope with this, the Cogl context now also stores a mask to track the enabled arrays. Instead of code manually iterating each enabled array to disable them, there is now an internal function called _cogl_disable_texcoord_arrays which disables a given mask. I think this could also fix potential bugs when a vertex buffer has gaps in the texture coordinate attributes that it provides. For example if the vertex buffer only had texture coordinates for layer 2 then the disabling code would not disable the coordinates for layers 0 and 1 even though they are not used. This could cause a crash if the previous data for those arrays is no longer valid. http://bugzilla.openedhand.com/show_bug.cgi?id=2132 |
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