lp_bld_sample.h revision 67a2f98be79b368c316ebe6731112734d306b3f6 
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 * Texture sampling.
31 *
32 * @author Jose Fonseca <jfonseca@vmware.com>
33 */
34
35#ifndef LP_BLD_SAMPLE_H
36#define LP_BLD_SAMPLE_H
37
38
39#include <llvm-c/Core.h>
40
41struct pipe_texture;
42struct pipe_sampler_state;
43struct util_format_description;
44struct lp_type;
45struct lp_build_context;
46
47
48/**
49 * Sampler static state.
50 *
51 * These are the bits of state from pipe_texture and pipe_sampler_state that
52 * are embedded in the generated code.
53 */
54struct lp_sampler_static_state
55{
56   /* pipe_texture's state */
57   enum pipe_format format;
58   unsigned target:2;
59   unsigned pot_width:1;
60   unsigned pot_height:1;
61   unsigned pot_depth:1;
62
63   /* pipe_sampler_state's state */
64   unsigned wrap_s:3;
65   unsigned wrap_t:3;
66   unsigned wrap_r:3;
67   unsigned min_img_filter:2;
68   unsigned min_mip_filter:2;
69   unsigned mag_img_filter:2;
70   unsigned compare_mode:1;
71   unsigned compare_func:3;
72   unsigned normalized_coords:1;
73   float lod_bias, min_lod, max_lod;
74   float border_color[4];
75};
76
77
78/**
79 * Sampler dynamic state.
80 *
81 * These are the bits of state from pipe_texture and pipe_sampler_state that
82 * are computed in runtime.
83 *
84 * There are obtained through callbacks, as we don't want to tie the texture
85 * sampling code generation logic to any particular texture layout or pipe
86 * driver.
87 */
88struct lp_sampler_dynamic_state
89{
90
91   /** Obtain the base texture width. */
92   LLVMValueRef
93   (*width)( struct lp_sampler_dynamic_state *state,
94             LLVMBuilderRef builder,
95             unsigned unit);
96
97   /** Obtain the base texture height. */
98   LLVMValueRef
99   (*height)( struct lp_sampler_dynamic_state *state,
100              LLVMBuilderRef builder,
101              unsigned unit);
102
103   /** Obtain the base texture depth. */
104   LLVMValueRef
105   (*depth)( struct lp_sampler_dynamic_state *state,
106             LLVMBuilderRef builder,
107             unsigned unit);
108
109   /** Obtain the number of mipmap levels (minus one). */
110   LLVMValueRef
111   (*last_level)( struct lp_sampler_dynamic_state *state,
112                  LLVMBuilderRef builder,
113                  unsigned unit);
114
115   LLVMValueRef
116   (*stride)( struct lp_sampler_dynamic_state *state,
117              LLVMBuilderRef builder,
118              unsigned unit);
119
120   LLVMValueRef
121   (*data_ptr)( struct lp_sampler_dynamic_state *state,
122                LLVMBuilderRef builder,
123                unsigned unit);
124
125};
126
127
128/**
129 * Derive the sampler static state.
130 */
131void
132lp_sampler_static_state(struct lp_sampler_static_state *state,
133                        const struct pipe_texture *texture,
134                        const struct pipe_sampler_state *sampler);
135
136
137LLVMValueRef
138lp_build_gather(LLVMBuilderRef builder,
139                unsigned length,
140                unsigned src_width,
141                unsigned dst_width,
142                LLVMValueRef base_ptr,
143                LLVMValueRef offsets);
144
145
146LLVMValueRef
147lp_build_sample_offset(struct lp_build_context *bld,
148                       const struct util_format_description *format_desc,
149                       LLVMValueRef x,
150                       LLVMValueRef y,
151                       LLVMValueRef z,
152                       LLVMValueRef y_stride,
153                       LLVMValueRef z_stride);
154
155
156void
157lp_build_sample_soa(LLVMBuilderRef builder,
158                    const struct lp_sampler_static_state *static_state,
159                    struct lp_sampler_dynamic_state *dynamic_state,
160                    struct lp_type fp_type,
161                    unsigned unit,
162                    unsigned num_coords,
163                    const LLVMValueRef *coords,
164                    LLVMValueRef lodbias,
165                    LLVMValueRef *texel);
166
167
168
169#endif /* LP_BLD_SAMPLE_H */
170