main: Added entry point for BindTextureUnit.

The following preparations were made in texstate.c and texstate.h to
better facilitate the BindTextureUnit function:

Dylan Noblesmith:
mesa: add _mesa_get_tex_unit()
mesa: factor out _mesa_max_tex_unit()
This is about to appear in a lot more places, so
reduce boilerplate copy paste.
add _mesa_get_tex_unit_err() checking getter function
Reduce boilerplate across files.

Laura Ekstrand:
Made note of why BindTextureUnit should throw GL_INVALID_OPERATION if the unit is out of range.
Added assert(unit > 0) to _mesa_get_tex_unit.

Reviewed-by: Anuj Phogat <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mesa/main/tests/dispatch_sanity.cpp b/src/mesa/main/tests/dispatch_sanity.cpp
index c9decb7af8b..0ef48c9b299 100644
--- a/src/mesa/main/tests/dispatch_sanity.cpp
+++ b/src/mesa/main/tests/dispatch_sanity.cpp
@@ -962,6 +962,7 @@ const struct function gl_core_functions_possible[] = {
    { "glTextureSubImage1D", 45, -1 },
    { "glTextureSubImage2D", 45, -1 },
    { "glTextureSubImage3D", 45, -1 },
+   { "glBindTextureUnit", 45, -1 },
 
    { NULL, 0, -1 }
 };