1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
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30 * Position and shader input interpolation.
32 * Special attention is given to the interpolation of side by side quads.
33 * Multiplications are made only for the first quad. Interpolation of
34 * inputs for posterior quads are done exclusively with additions, and
35 * perspective divide if necessary.
37 * @author Jose Fonseca <jfonseca@vmware.com>
40 #ifndef LP_BLD_INTERP_H
41 #define LP_BLD_INTERP_H
44 #include "gallivm/lp_bld.h"
45 #include "gallivm/lp_bld_type.h"
47 #include "tgsi/tgsi_exec.h"
52 struct lp_build_interp_soa_context
54 struct lp_build_context base
;
57 unsigned mask
[1 + PIPE_MAX_SHADER_INPUTS
]; /**< TGSI_WRITE_MASK_x */
58 enum lp_interp interp
[1 + PIPE_MAX_SHADER_INPUTS
];
60 LLVMValueRef a0
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
61 LLVMValueRef dadx
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
62 LLVMValueRef dady
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
64 /* Attribute values before perspective divide */
65 LLVMValueRef attribs_pre
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
67 LLVMValueRef attribs
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
70 * Convenience pointers. Callers may access this one.
72 const LLVMValueRef
*pos
;
73 const LLVMValueRef (*inputs
)[NUM_CHANNELS
];
78 lp_build_interp_soa_init(struct lp_build_interp_soa_context
*bld
,
80 const struct lp_shader_input
*inputs
,
81 LLVMBuilderRef builder
,
84 LLVMValueRef dadx_ptr
,
85 LLVMValueRef dady_ptr
,
90 lp_build_interp_soa_update(struct lp_build_interp_soa_context
*bld
,
94 #endif /* LP_BLD_INTERP_H */