1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
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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"
50 * Describes how to compute the interpolation coefficients (a0, dadx, dady)
51 * from the vertices passed into our triangle/line/point functions by the
54 * Vertices are treated as an array of float[4] values, indexed by
57 * LP_INTERP_COLOR is translated to either LP_INTERP_CONSTANT or
58 * PERSPECTIVE depending on flatshade state.
64 LP_INTERP_PERSPECTIVE
,
69 struct lp_shader_input
{
70 uint interp
:4; /* enum lp_interp */
71 uint usage_mask
:4; /* bitmask of TGSI_WRITEMASK_x flags */
72 uint src_index
:8; /* where to find values in incoming vertices */
73 uint cyl_wrap
:4; /* TGSI_CYLINDRICAL_WRAP_x flags */
74 uint location
:2; /* TGSI_INTERPOLOATE_LOC_* */
79 struct lp_build_interp_soa_context
81 /* TGSI_QUAD_SIZE x float */
82 struct lp_build_context coeff_bld
;
83 struct lp_build_context setup_bld
;
86 unsigned mask
[1 + PIPE_MAX_SHADER_INPUTS
]; /**< TGSI_WRITE_MASK_x */
87 enum lp_interp interp
[1 + PIPE_MAX_SHADER_INPUTS
];
88 unsigned interp_loc
[1 + PIPE_MAX_SHADER_INPUTS
];
92 unsigned coverage_samples
;
93 LLVMValueRef num_loop
;
94 LLVMValueRef sample_pos_array
;
100 LLVMValueRef dadx_ptr
;
101 LLVMValueRef dady_ptr
;
103 LLVMValueRef a0aos
[1 + PIPE_MAX_SHADER_INPUTS
];
104 LLVMValueRef dadxaos
[1 + PIPE_MAX_SHADER_INPUTS
];
105 LLVMValueRef dadyaos
[1 + PIPE_MAX_SHADER_INPUTS
];
107 LLVMValueRef attribs
[1 + PIPE_MAX_SHADER_INPUTS
][TGSI_NUM_CHANNELS
];
109 LLVMValueRef xoffset_store
;
110 LLVMValueRef yoffset_store
;
113 * Convenience pointers. Callers may access this one.
115 const LLVMValueRef
*pos
;
116 const LLVMValueRef (*inputs
)[TGSI_NUM_CHANNELS
];
121 lp_build_interp_soa_init(struct lp_build_interp_soa_context
*bld
,
122 struct gallivm_state
*gallivm
,
124 const struct lp_shader_input
*inputs
,
125 boolean pixel_center_integer
,
126 unsigned coverage_samples
,
127 LLVMValueRef sample_pos_array
,
128 LLVMValueRef num_loop
,
130 LLVMBuilderRef builder
,
133 LLVMValueRef dadx_ptr
,
134 LLVMValueRef dady_ptr
,
139 lp_build_interp_soa_update_inputs_dyn(struct lp_build_interp_soa_context
*bld
,
140 struct gallivm_state
*gallivm
,
141 LLVMValueRef quad_start_index
,
142 LLVMValueRef mask_store
,
143 LLVMValueRef sample_id
);
146 lp_build_interp_soa_update_pos_dyn(struct lp_build_interp_soa_context
*bld
,
147 struct gallivm_state
*gallivm
,
148 LLVMValueRef quad_start_index
,
149 LLVMValueRef sample_id
);
152 lp_build_interp_soa(struct lp_build_interp_soa_context
*bld
,
153 struct gallivm_state
*gallivm
,
154 LLVMValueRef loop_iter
,
155 LLVMValueRef mask_store
,
156 unsigned attrib
, unsigned chan
,
158 LLVMValueRef indir_index
,
159 LLVMValueRef offsets
[2]);
161 #endif /* LP_BLD_INTERP_H */