1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
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11 * permit persons to whom the Software is furnished to do so, subject to
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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 "gallivm/lp_bld.h"
45 #include "gallivm/lp_bld_type.h"
47 #include "tgsi/tgsi_exec.h"
54 struct lp_build_interp_soa_context
56 struct lp_build_context base
;
59 unsigned mask
[1 + PIPE_MAX_SHADER_INPUTS
]; /**< TGSI_WRITE_MASK_x */
60 unsigned interp
[1 + PIPE_MAX_SHADER_INPUTS
]; /**< TGSI_INTERPOLATE_x */
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
];
66 /* Attribute values before perspective divide */
67 LLVMValueRef attribs_pre
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
69 LLVMValueRef attribs
[1 + PIPE_MAX_SHADER_INPUTS
][NUM_CHANNELS
];
72 * Convenience pointers. Callers may access this one.
74 const LLVMValueRef
*pos
;
75 const LLVMValueRef (*inputs
)[NUM_CHANNELS
];
80 lp_build_interp_soa_init(struct lp_build_interp_soa_context
*bld
,
81 const struct tgsi_token
*tokens
,
83 LLVMBuilderRef builder
,
86 LLVMValueRef dadx_ptr
,
87 LLVMValueRef dady_ptr
,
92 lp_build_interp_soa_update(struct lp_build_interp_soa_context
*bld
,
96 #endif /* LP_BLD_INTERP_H */