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mesa: optimize get_index_size 

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4052>
This commit is contained in:
Marek Olšák 2020-03-03 15:08:09 -05:00
parent 450152f8d8
commit 7700ac3d80
1 changed files with 9 additions and 16 deletions
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25
src/mesa/main/draw.c
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@ -107,22 +107,15 @@ check_array_data(struct gl_context *ctx, struct gl_vertex_array_object *vao,
static inline void
get_index_size(GLenum type, struct _mesa_index_buffer *ib)
{
switch (type) {
case GL_UNSIGNED_INT:
ib->index_size_shift = 2;
break;
case GL_UNSIGNED_SHORT:
ib->index_size_shift = 1;
break;
case GL_UNSIGNED_BYTE:
ib->index_size_shift = 0;
break;
default:
assert(!"unsupported index data type");
/* In case assert is turned off */
ib->index_size_shift = 0;
break;
}
/* The type is already validated, so use a fast conversion.
*
* GL_UNSIGNED_BYTE - GL_UNSIGNED_BYTE = 0
* GL_UNSIGNED_SHORT - GL_UNSIGNED_BYTE = 2
* GL_UNSIGNED_INT - GL_UNSIGNED_BYTE = 4
*
* Divide by 2 to get 0,1,2.
*/
ib->index_size_shift = (type - GL_UNSIGNED_BYTE) >> 1;
}
/**