1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
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14 * The above copyright notice and this permission notice (including the
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26 **************************************************************************/
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 <llvm-c/Core.h>
46 #include "tgsi/tgsi_exec.h"
48 #include "lp_bld_type.h"
54 struct lp_build_interp_soa_context
56 struct lp_build_context base
;
59 unsigned mask
[1 + PIPE_MAX_SHADER_INPUTS
];
60 unsigned mode
[1 + PIPE_MAX_SHADER_INPUTS
];
62 LLVMValueRef a0
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
63 LLVMValueRef dadx
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
64 LLVMValueRef dady
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
69 /* Attribute values before perspective divide */
70 LLVMValueRef attribs_pre
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
72 LLVMValueRef attribs
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
75 * Convenience pointers. Callers may access this one.
77 const LLVMValueRef
*pos
;
78 const LLVMValueRef (*inputs
)[NUM_CHANNELS
];
83 lp_build_interp_soa_init(struct lp_build_interp_soa_context
*bld
,
84 const struct tgsi_token
*tokens
,
85 LLVMBuilderRef builder
,
88 LLVMValueRef dadx_ptr
,
89 LLVMValueRef dady_ptr
,
96 lp_build_interp_soa_update(struct lp_build_interp_soa_context
*bld
);
99 #endif /* LP_BLD_INTERP_H */