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1 /**************************************************************************
2  *
3  * Copyright 2009 VMware, Inc.
4  * All Rights Reserved.
5  *
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
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sub license, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice (including the
15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25  *
26  **************************************************************************/
27 
28 /**
29  * @file
30  * Position and shader input interpolation.
31  *
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.
36  *
37  * @author Jose Fonseca <jfonseca@vmware.com>
38  */
39 
40 #ifndef LP_BLD_INTERP_H
41 #define LP_BLD_INTERP_H
42 
43 
44 #include "gallivm/lp_bld.h"
45 #include "gallivm/lp_bld_type.h"
46 
47 #include "tgsi/tgsi_exec.h"
48 
49 /**
50  * Describes how to compute the interpolation coefficients (a0, dadx, dady)
51  * from the vertices passed into our triangle/line/point functions by the
52  * draw module.
53  *
54  * Vertices are treated as an array of float[4] values, indexed by
55  * src_index.
56  *
57  * LP_INTERP_COLOR is translated to either LP_INTERP_CONSTANT or
58  * PERSPECTIVE depending on flatshade state.
59  */
60 enum lp_interp {
61    LP_INTERP_CONSTANT,
62    LP_INTERP_COLOR,
63    LP_INTERP_LINEAR,
64    LP_INTERP_PERSPECTIVE,
65    LP_INTERP_POSITION,
66    LP_INTERP_FACING
67 };
68 
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 padding:12;
75 };
76 
77 
78 struct lp_build_interp_soa_context
79 {
80    /* TGSI_QUAD_SIZE x float */
81    struct lp_build_context coeff_bld;
82    struct lp_build_context setup_bld;
83 
84    unsigned num_attribs;
85    unsigned mask[1 + PIPE_MAX_SHADER_INPUTS]; /**< TGSI_WRITE_MASK_x */
86    enum lp_interp interp[1 + PIPE_MAX_SHADER_INPUTS];
87    boolean simple_interp;
88    boolean depth_clamp;
89 
90    double pos_offset;
91 
92    LLVMValueRef x;
93    LLVMValueRef y;
94 
95    LLVMValueRef a[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS];
96    LLVMValueRef dadq[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS];
97    LLVMValueRef a0aos[1 + PIPE_MAX_SHADER_INPUTS];
98    LLVMValueRef dadxaos[1 + PIPE_MAX_SHADER_INPUTS];
99    LLVMValueRef dadyaos[1 + PIPE_MAX_SHADER_INPUTS];
100 
101    LLVMValueRef attribs[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS];
102 
103    LLVMValueRef xoffset_store;
104    LLVMValueRef yoffset_store;
105 
106    /*
107     * Convenience pointers. Callers may access this one.
108     */
109    const LLVMValueRef *pos;
110    const LLVMValueRef (*inputs)[TGSI_NUM_CHANNELS];
111 };
112 
113 
114 void
115 lp_build_interp_soa_init(struct lp_build_interp_soa_context *bld,
116                          struct gallivm_state *gallivm,
117                          unsigned num_inputs,
118                          const struct lp_shader_input *inputs,
119                          boolean pixel_center_integer,
120                          boolean depth_clamp,
121                          LLVMBuilderRef builder,
122                          struct lp_type type,
123                          LLVMValueRef a0_ptr,
124                          LLVMValueRef dadx_ptr,
125                          LLVMValueRef dady_ptr,
126                          LLVMValueRef x,
127                          LLVMValueRef y);
128 
129 void
130 lp_build_interp_soa_update_inputs_dyn(struct lp_build_interp_soa_context *bld,
131                                       struct gallivm_state *gallivm,
132                                       LLVMValueRef quad_start_index);
133 
134 void
135 lp_build_interp_soa_update_pos_dyn(struct lp_build_interp_soa_context *bld,
136                                    struct gallivm_state *gallivm,
137                                    LLVMValueRef quad_start_index);
138 
139 #endif /* LP_BLD_INTERP_H */
140