draw_llvm_sample.c revision efc82aef35a2aac5d2ed9774f6d28f2626796416
1/**************************************************************************
2 *
3 * Copyright 2010 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 * Texture sampling code generation
30 * @author Jose Fonseca <jfonseca@vmware.com>
31 */
32
33#include "pipe/p_defines.h"
34#include "pipe/p_shader_tokens.h"
35#include "gallivm/lp_bld_const.h"
36#include "gallivm/lp_bld_debug.h"
37#include "gallivm/lp_bld_type.h"
38#include "gallivm/lp_bld_sample.h"
39#include "gallivm/lp_bld_tgsi.h"
40
41
42#include "util/u_debug.h"
43#include "util/u_memory.h"
44#include "util/u_pointer.h"
45#include "util/u_string.h"
46
47#include "draw_llvm.h"
48
49
50/**
51 * This provides the bridge between the sampler state store in
52 * lp_jit_context and lp_jit_texture and the sampler code
53 * generator. It provides the texture layout information required by
54 * the texture sampler code generator in terms of the state stored in
55 * lp_jit_context and lp_jit_texture in runtime.
56 */
57struct draw_llvm_sampler_dynamic_state
58{
59   struct lp_sampler_dynamic_state base;
60
61   const struct lp_sampler_static_state *static_state;
62
63   LLVMValueRef context_ptr;
64};
65
66
67/**
68 * This is the bridge between our sampler and the TGSI translator.
69 */
70struct draw_llvm_sampler_soa
71{
72   struct lp_build_sampler_soa base;
73
74   struct draw_llvm_sampler_dynamic_state dynamic_state;
75};
76
77
78/**
79 * Fetch the specified member of the lp_jit_texture structure.
80 * \param emit_load  if TRUE, emit the LLVM load instruction to actually
81 *                   fetch the field's value.  Otherwise, just emit the
82 *                   GEP code to address the field.
83 *
84 * @sa http://llvm.org/docs/GetElementPtr.html
85 */
86static LLVMValueRef
87draw_llvm_texture_member(const struct lp_sampler_dynamic_state *base,
88                         struct gallivm_state *gallivm,
89                         unsigned unit,
90                         unsigned member_index,
91                         const char *member_name,
92                         boolean emit_load)
93{
94   LLVMBuilderRef builder = gallivm->builder;
95   struct draw_llvm_sampler_dynamic_state *state =
96      (struct draw_llvm_sampler_dynamic_state *)base;
97   LLVMValueRef indices[4];
98   LLVMValueRef ptr;
99   LLVMValueRef res;
100
101   debug_assert(unit < PIPE_MAX_VERTEX_SAMPLERS);
102
103   /* context[0] */
104   indices[0] = lp_build_const_int32(gallivm, 0);
105   /* context[0].textures */
106   indices[1] = lp_build_const_int32(gallivm, DRAW_JIT_CTX_TEXTURES);
107   /* context[0].textures[unit] */
108   indices[2] = lp_build_const_int32(gallivm, unit);
109   /* context[0].textures[unit].member */
110   indices[3] = lp_build_const_int32(gallivm, member_index);
111
112   ptr = LLVMBuildGEP(builder, state->context_ptr, indices, Elements(indices), "");
113
114   if (emit_load)
115      res = LLVMBuildLoad(builder, ptr, "");
116   else
117      res = ptr;
118
119   lp_build_name(res, "context.texture%u.%s", unit, member_name);
120
121   return res;
122}
123
124
125/**
126 * Helper macro to instantiate the functions that generate the code to
127 * fetch the members of lp_jit_texture to fulfill the sampler code
128 * generator requests.
129 *
130 * This complexity is the price we have to pay to keep the texture
131 * sampler code generator a reusable module without dependencies to
132 * llvmpipe internals.
133 */
134#define DRAW_LLVM_TEXTURE_MEMBER(_name, _index, _emit_load)  \
135   static LLVMValueRef \
136   draw_llvm_texture_##_name( const struct lp_sampler_dynamic_state *base, \
137                              struct gallivm_state *gallivm,               \
138                              unsigned unit)                            \
139   { \
140      return draw_llvm_texture_member(base, gallivm, unit, _index, #_name, _emit_load ); \
141   }
142
143
144DRAW_LLVM_TEXTURE_MEMBER(width,      DRAW_JIT_TEXTURE_WIDTH, TRUE)
145DRAW_LLVM_TEXTURE_MEMBER(height,     DRAW_JIT_TEXTURE_HEIGHT, TRUE)
146DRAW_LLVM_TEXTURE_MEMBER(depth,      DRAW_JIT_TEXTURE_DEPTH, TRUE)
147DRAW_LLVM_TEXTURE_MEMBER(last_level, DRAW_JIT_TEXTURE_LAST_LEVEL, TRUE)
148DRAW_LLVM_TEXTURE_MEMBER(row_stride, DRAW_JIT_TEXTURE_ROW_STRIDE, FALSE)
149DRAW_LLVM_TEXTURE_MEMBER(img_stride, DRAW_JIT_TEXTURE_IMG_STRIDE, FALSE)
150DRAW_LLVM_TEXTURE_MEMBER(data_ptr,   DRAW_JIT_TEXTURE_DATA, FALSE)
151DRAW_LLVM_TEXTURE_MEMBER(min_lod,    DRAW_JIT_TEXTURE_MIN_LOD, TRUE)
152DRAW_LLVM_TEXTURE_MEMBER(max_lod,    DRAW_JIT_TEXTURE_MAX_LOD, TRUE)
153DRAW_LLVM_TEXTURE_MEMBER(lod_bias,   DRAW_JIT_TEXTURE_LOD_BIAS, TRUE)
154DRAW_LLVM_TEXTURE_MEMBER(border_color, DRAW_JIT_TEXTURE_BORDER_COLOR, FALSE)
155
156
157static void
158draw_llvm_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
159{
160   FREE(sampler);
161}
162
163
164/**
165 * Fetch filtered values from texture.
166 * The 'texel' parameter returns four vectors corresponding to R, G, B, A.
167 */
168static void
169draw_llvm_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa *base,
170                                       struct gallivm_state *gallivm,
171                                       struct lp_type type,
172                                       unsigned unit,
173                                       unsigned num_coords,
174                                       const LLVMValueRef *coords,
175                                       const LLVMValueRef *ddx,
176                                       const LLVMValueRef *ddy,
177                                       LLVMValueRef lod_bias, /* optional */
178                                       LLVMValueRef explicit_lod, /* optional */
179                                       LLVMValueRef *texel)
180{
181   struct draw_llvm_sampler_soa *sampler = (struct draw_llvm_sampler_soa *)base;
182
183   assert(unit < PIPE_MAX_VERTEX_SAMPLERS);
184
185   lp_build_sample_soa(gallivm,
186                       &sampler->dynamic_state.static_state[unit],
187                       &sampler->dynamic_state.base,
188                       type,
189                       unit,
190                       num_coords, coords,
191                       ddx, ddy,
192                       lod_bias, explicit_lod,
193                       texel);
194}
195
196
197struct lp_build_sampler_soa *
198draw_llvm_sampler_soa_create(const struct lp_sampler_static_state *static_state,
199                             LLVMValueRef context_ptr)
200{
201   struct draw_llvm_sampler_soa *sampler;
202
203   sampler = CALLOC_STRUCT(draw_llvm_sampler_soa);
204   if(!sampler)
205      return NULL;
206
207   sampler->base.destroy = draw_llvm_sampler_soa_destroy;
208   sampler->base.emit_fetch_texel = draw_llvm_sampler_soa_emit_fetch_texel;
209   sampler->dynamic_state.base.width = draw_llvm_texture_width;
210   sampler->dynamic_state.base.height = draw_llvm_texture_height;
211   sampler->dynamic_state.base.depth = draw_llvm_texture_depth;
212   sampler->dynamic_state.base.last_level = draw_llvm_texture_last_level;
213   sampler->dynamic_state.base.row_stride = draw_llvm_texture_row_stride;
214   sampler->dynamic_state.base.img_stride = draw_llvm_texture_img_stride;
215   sampler->dynamic_state.base.data_ptr = draw_llvm_texture_data_ptr;
216   sampler->dynamic_state.base.min_lod = draw_llvm_texture_min_lod;
217   sampler->dynamic_state.base.max_lod = draw_llvm_texture_max_lod;
218   sampler->dynamic_state.base.lod_bias = draw_llvm_texture_lod_bias;
219   sampler->dynamic_state.base.border_color = draw_llvm_texture_border_color;
220   sampler->dynamic_state.static_state = static_state;
221   sampler->dynamic_state.context_ptr = context_ptr;
222
223   return &sampler->base;
224}
225
226