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 * Largely a copy of llvmpipe's lp_tex_sample.c
30 */
31
32 /**
33 * Texture sampling code generation
34 *
35 * This file is nothing more than ugly glue between three largely independent
36 * entities:
37 * - TGSI -> LLVM translation (i.e., lp_build_tgsi_soa)
38 * - texture sampling code generation (i.e., lp_build_sample_soa)
39 * - SWR driver
40 *
41 * All interesting code is in the functions mentioned above. There is really
42 * nothing to see here.
43 *
44 * @author Jose Fonseca <jfonseca@vmware.com>
45 */
46
47 #include "state.h"
48 #include "JitManager.h"
49 #include "gen_state_llvm.h"
50
51 #include "pipe/p_defines.h"
52 #include "pipe/p_shader_tokens.h"
53 #include "gallivm/lp_bld_debug.h"
54 #include "gallivm/lp_bld_const.h"
55 #include "gallivm/lp_bld_type.h"
56 #include "gallivm/lp_bld_sample.h"
57 #include "gallivm/lp_bld_tgsi.h"
58 #include "util/u_memory.h"
59
60 #include "swr_tex_sample.h"
61 #include "gen_swr_context_llvm.h"
62
63 using namespace SwrJit;
64
65 /**
66 * This provides the bridge between the sampler state store in
67 * lp_jit_context and lp_jit_texture and the sampler code
68 * generator. It provides the texture layout information required by
69 * the texture sampler code generator in terms of the state stored in
70 * lp_jit_context and lp_jit_texture in runtime.
71 */
72 struct swr_sampler_dynamic_state {
73 struct lp_sampler_dynamic_state base;
74
75 const struct swr_sampler_static_state *static_state;
76
77 enum pipe_shader_type shader_type;
78 };
79
80
81 /**
82 * This is the bridge between our sampler and the TGSI translator.
83 */
84 struct swr_sampler_soa {
85 struct lp_build_sampler_soa base;
86
87 struct swr_sampler_dynamic_state dynamic_state;
88 };
89
90
91 /**
92 * Fetch the specified member of the lp_jit_texture structure.
93 * \param emit_load if TRUE, emit the LLVM load instruction to actually
94 * fetch the field's value. Otherwise, just emit the
95 * GEP code to address the field.
96 *
97 * @sa http://llvm.org/docs/GetElementPtr.html
98 */
99 static LLVMValueRef
swr_texture_member(const struct lp_sampler_dynamic_state * base,struct gallivm_state * gallivm,LLVMValueRef context_ptr,unsigned texture_unit,unsigned member_index,const char * member_name,boolean emit_load)100 swr_texture_member(const struct lp_sampler_dynamic_state *base,
101 struct gallivm_state *gallivm,
102 LLVMValueRef context_ptr,
103 unsigned texture_unit,
104 unsigned member_index,
105 const char *member_name,
106 boolean emit_load)
107 {
108 LLVMBuilderRef builder = gallivm->builder;
109 LLVMValueRef indices[4];
110 LLVMValueRef ptr;
111 LLVMValueRef res;
112
113 assert(texture_unit < PIPE_MAX_SHADER_SAMPLER_VIEWS);
114
115 /* context[0] */
116 indices[0] = lp_build_const_int32(gallivm, 0);
117 /* context[0].textures */
118 auto dynamic = (const struct swr_sampler_dynamic_state *)base;
119 switch (dynamic->shader_type) {
120 case PIPE_SHADER_FRAGMENT:
121 indices[1] = lp_build_const_int32(gallivm, swr_draw_context_texturesFS);
122 break;
123 case PIPE_SHADER_VERTEX:
124 indices[1] = lp_build_const_int32(gallivm, swr_draw_context_texturesVS);
125 break;
126 case PIPE_SHADER_GEOMETRY:
127 indices[1] = lp_build_const_int32(gallivm, swr_draw_context_texturesGS);
128 break;
129 default:
130 assert(0 && "unsupported shader type");
131 break;
132 }
133 /* context[0].textures[unit] */
134 indices[2] = lp_build_const_int32(gallivm, texture_unit);
135 /* context[0].textures[unit].member */
136 indices[3] = lp_build_const_int32(gallivm, member_index);
137
138 ptr = LLVMBuildGEP(builder, context_ptr, indices, ARRAY_SIZE(indices), "");
139
140 if (emit_load)
141 res = LLVMBuildLoad(builder, ptr, "");
142 else
143 res = ptr;
144
145 lp_build_name(res, "context.texture%u.%s", texture_unit, member_name);
146
147 return res;
148 }
149
150
151 /**
152 * Helper macro to instantiate the functions that generate the code to
153 * fetch the members of lp_jit_texture to fulfill the sampler code
154 * generator requests.
155 *
156 * This complexity is the price we have to pay to keep the texture
157 * sampler code generator a reusable module without dependencies to
158 * swr internals.
159 */
160 #define SWR_TEXTURE_MEMBER(_name, _emit_load) \
161 static LLVMValueRef swr_texture_##_name( \
162 const struct lp_sampler_dynamic_state *base, \
163 struct gallivm_state *gallivm, \
164 LLVMValueRef context_ptr, \
165 unsigned texture_unit) \
166 { \
167 return swr_texture_member(base, \
168 gallivm, \
169 context_ptr, \
170 texture_unit, \
171 swr_jit_texture_##_name, \
172 #_name, \
173 _emit_load); \
174 }
175
176
SWR_TEXTURE_MEMBER(width,TRUE)177 SWR_TEXTURE_MEMBER(width, TRUE)
178 SWR_TEXTURE_MEMBER(height, TRUE)
179 SWR_TEXTURE_MEMBER(depth, TRUE)
180 SWR_TEXTURE_MEMBER(first_level, TRUE)
181 SWR_TEXTURE_MEMBER(last_level, TRUE)
182 SWR_TEXTURE_MEMBER(base_ptr, TRUE)
183 SWR_TEXTURE_MEMBER(row_stride, FALSE)
184 SWR_TEXTURE_MEMBER(img_stride, FALSE)
185 SWR_TEXTURE_MEMBER(mip_offsets, FALSE)
186
187
188 /**
189 * Fetch the specified member of the lp_jit_sampler structure.
190 * \param emit_load if TRUE, emit the LLVM load instruction to actually
191 * fetch the field's value. Otherwise, just emit the
192 * GEP code to address the field.
193 *
194 * @sa http://llvm.org/docs/GetElementPtr.html
195 */
196 static LLVMValueRef
197 swr_sampler_member(const struct lp_sampler_dynamic_state *base,
198 struct gallivm_state *gallivm,
199 LLVMValueRef context_ptr,
200 unsigned sampler_unit,
201 unsigned member_index,
202 const char *member_name,
203 boolean emit_load)
204 {
205 LLVMBuilderRef builder = gallivm->builder;
206 LLVMValueRef indices[4];
207 LLVMValueRef ptr;
208 LLVMValueRef res;
209
210 assert(sampler_unit < PIPE_MAX_SAMPLERS);
211
212 /* context[0] */
213 indices[0] = lp_build_const_int32(gallivm, 0);
214 /* context[0].samplers */
215 auto dynamic = (const struct swr_sampler_dynamic_state *)base;
216 switch (dynamic->shader_type) {
217 case PIPE_SHADER_FRAGMENT:
218 indices[1] = lp_build_const_int32(gallivm, swr_draw_context_samplersFS);
219 break;
220 case PIPE_SHADER_VERTEX:
221 indices[1] = lp_build_const_int32(gallivm, swr_draw_context_samplersVS);
222 break;
223 case PIPE_SHADER_GEOMETRY:
224 indices[1] = lp_build_const_int32(gallivm, swr_draw_context_samplersGS);
225 break;
226 default:
227 assert(0 && "unsupported shader type");
228 break;
229 }
230 /* context[0].samplers[unit] */
231 indices[2] = lp_build_const_int32(gallivm, sampler_unit);
232 /* context[0].samplers[unit].member */
233 indices[3] = lp_build_const_int32(gallivm, member_index);
234
235 ptr = LLVMBuildGEP(builder, context_ptr, indices, ARRAY_SIZE(indices), "");
236
237 if (emit_load)
238 res = LLVMBuildLoad(builder, ptr, "");
239 else
240 res = ptr;
241
242 lp_build_name(res, "context.sampler%u.%s", sampler_unit, member_name);
243
244 return res;
245 }
246
247
248 #define SWR_SAMPLER_MEMBER(_name, _emit_load) \
249 static LLVMValueRef swr_sampler_##_name( \
250 const struct lp_sampler_dynamic_state *base, \
251 struct gallivm_state *gallivm, \
252 LLVMValueRef context_ptr, \
253 unsigned sampler_unit) \
254 { \
255 return swr_sampler_member(base, \
256 gallivm, \
257 context_ptr, \
258 sampler_unit, \
259 swr_jit_sampler_##_name, \
260 #_name, \
261 _emit_load); \
262 }
263
264
SWR_SAMPLER_MEMBER(min_lod,TRUE)265 SWR_SAMPLER_MEMBER(min_lod, TRUE)
266 SWR_SAMPLER_MEMBER(max_lod, TRUE)
267 SWR_SAMPLER_MEMBER(lod_bias, TRUE)
268 SWR_SAMPLER_MEMBER(border_color, FALSE)
269
270
271 static void
272 swr_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
273 {
274 FREE(sampler);
275 }
276
277
278 /**
279 * Fetch filtered values from texture.
280 * The 'texel' parameter returns four vectors corresponding to R, G, B, A.
281 */
282 static void
swr_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa * base,struct gallivm_state * gallivm,const struct lp_sampler_params * params)283 swr_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa *base,
284 struct gallivm_state *gallivm,
285 const struct lp_sampler_params *params)
286 {
287 struct swr_sampler_soa *sampler = (struct swr_sampler_soa *)base;
288 unsigned texture_index = params->texture_index;
289 unsigned sampler_index = params->sampler_index;
290
291 assert(sampler_index < PIPE_MAX_SAMPLERS);
292 assert(texture_index < PIPE_MAX_SHADER_SAMPLER_VIEWS);
293
294 #if 0
295 lp_build_sample_nop(gallivm, params->type, params->coords, params->texel);
296 #else
297 lp_build_sample_soa(
298 &sampler->dynamic_state.static_state[texture_index].texture_state,
299 &sampler->dynamic_state.static_state[sampler_index].sampler_state,
300 &sampler->dynamic_state.base,
301 gallivm,
302 params);
303 #endif
304 }
305
306 /**
307 * Fetch the texture size.
308 */
309 static void
swr_sampler_soa_emit_size_query(const struct lp_build_sampler_soa * base,struct gallivm_state * gallivm,const struct lp_sampler_size_query_params * params)310 swr_sampler_soa_emit_size_query(const struct lp_build_sampler_soa *base,
311 struct gallivm_state *gallivm,
312 const struct lp_sampler_size_query_params *params)
313 {
314 struct swr_sampler_soa *sampler = (struct swr_sampler_soa *)base;
315
316 assert(params->texture_unit < PIPE_MAX_SHADER_SAMPLER_VIEWS);
317
318 lp_build_size_query_soa(
319 gallivm,
320 &sampler->dynamic_state.static_state[params->texture_unit].texture_state,
321 &sampler->dynamic_state.base,
322 params);
323 }
324
325
326 struct lp_build_sampler_soa *
swr_sampler_soa_create(const struct swr_sampler_static_state * static_state,enum pipe_shader_type shader_type)327 swr_sampler_soa_create(const struct swr_sampler_static_state *static_state,
328 enum pipe_shader_type shader_type)
329 {
330 struct swr_sampler_soa *sampler;
331
332 sampler = CALLOC_STRUCT(swr_sampler_soa);
333 if (!sampler)
334 return NULL;
335
336 sampler->base.destroy = swr_sampler_soa_destroy;
337 sampler->base.emit_tex_sample = swr_sampler_soa_emit_fetch_texel;
338 sampler->base.emit_size_query = swr_sampler_soa_emit_size_query;
339 sampler->dynamic_state.base.width = swr_texture_width;
340 sampler->dynamic_state.base.height = swr_texture_height;
341 sampler->dynamic_state.base.depth = swr_texture_depth;
342 sampler->dynamic_state.base.first_level = swr_texture_first_level;
343 sampler->dynamic_state.base.last_level = swr_texture_last_level;
344 sampler->dynamic_state.base.base_ptr = swr_texture_base_ptr;
345 sampler->dynamic_state.base.row_stride = swr_texture_row_stride;
346 sampler->dynamic_state.base.img_stride = swr_texture_img_stride;
347 sampler->dynamic_state.base.mip_offsets = swr_texture_mip_offsets;
348 sampler->dynamic_state.base.min_lod = swr_sampler_min_lod;
349 sampler->dynamic_state.base.max_lod = swr_sampler_max_lod;
350 sampler->dynamic_state.base.lod_bias = swr_sampler_lod_bias;
351 sampler->dynamic_state.base.border_color = swr_sampler_border_color;
352
353 sampler->dynamic_state.static_state = static_state;
354
355 sampler->dynamic_state.shader_type = shader_type;
356
357 return &sampler->base;
358 }
359