- struct lp_type type,
- boolean is_fetch,
- unsigned texture_index,
- unsigned sampler_index,
- const LLVMValueRef *coords,
- const LLVMValueRef *offsets,
- const struct lp_derivatives *derivs,
- LLVMValueRef lod_bias, /* optional */
- LLVMValueRef explicit_lod, /* optional */
- boolean scalar_lod,
- LLVMValueRef *texel)