src/gallium/drivers/llvmpipe/lp_tex_sample.c

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  27
  28 /**
  29  * Texture sampling code generation
  30  *
  31  * This file is nothing more than ugly glue between three largely independent
  32  * entities:
  33  * - TGSI -> LLVM translation (i.e., lp_build_tgsi_soa)
  34  * - texture sampling code generation (i.e., lp_build_sample_soa)
  35  * - LLVM pipe driver
  36  *
  37  * All interesting code is in the functions mentioned above. There is really
  38  * nothing to see here.
  39  *
  40  * @author Jose Fonseca <jfonseca@vmware.com>
  41  */
  42
  43 #include "pipe/p_defines.h"
  44 #include "pipe/p_shader_tokens.h"
  45 #include "gallivm/lp_bld_debug.h"
  46 #include "gallivm/lp_bld_const.h"
  47 #include "gallivm/lp_bld_type.h"
  48 #include "gallivm/lp_bld_sample.h"
  49 #include "gallivm/lp_bld_tgsi.h"
  50 #include "lp_jit.h"
  51 #include "lp_tex_sample.h"
  52 #include "lp_state_fs.h"
  53 #include "lp_debug.h"
  54
  55
  56 /**
  57  * This provides the bridge between the sampler state store in
  58  * lp_jit_context and lp_jit_texture and the sampler code
  59  * generator. It provides the texture layout information required by
  60  * the texture sampler code generator in terms of the state stored in
  61  * lp_jit_context and lp_jit_texture in runtime.
  62  */
  63 struct llvmpipe_sampler_dynamic_state
  64 {
  65    struct lp_sampler_dynamic_state base;
  66
  67    const struct lp_sampler_static_state *static_state;
  68 };
  69
  70
  71 /**
  72  * This is the bridge between our sampler and the TGSI translator.
  73  */
  74 struct lp_llvm_sampler_soa
  75 {
  76    struct lp_build_sampler_soa base;
  77
  78    struct llvmpipe_sampler_dynamic_state dynamic_state;
  79 };
  80
  81
  82 /**
  83  * Fetch the specified member of the lp_jit_texture structure.
  84  * \param emit_load  if TRUE, emit the LLVM load instruction to actually
  85  *                   fetch the field's value.  Otherwise, just emit the
  86  *                   GEP code to address the field.
  87  *
  88  * @sa http://llvm.org/docs/GetElementPtr.html
  89  */
  90 static LLVMValueRef
  91 lp_llvm_texture_member(const struct lp_sampler_dynamic_state *base,
  92                        struct gallivm_state *gallivm,
  93                        LLVMValueRef context_ptr,
  94                        unsigned texture_unit,
  95                        unsigned member_index,
  96                        const char *member_name,
  97                        boolean emit_load)
  98 {
  99    LLVMBuilderRef builder = gallivm->builder;
 100    LLVMValueRef indices[4];
 101    LLVMValueRef ptr;
 102    LLVMValueRef res;
 103
 104    assert(texture_unit < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 105
 106    /* context[0] */
 107    indices[0] = lp_build_const_int32(gallivm, 0);
 108    /* context[0].textures */
 109    indices[1] = lp_build_const_int32(gallivm, LP_JIT_CTX_TEXTURES);
 110    /* context[0].textures[unit] */
 111    indices[2] = lp_build_const_int32(gallivm, texture_unit);
 112    /* context[0].textures[unit].member */
 113    indices[3] = lp_build_const_int32(gallivm, member_index);
 114
 115    ptr = LLVMBuildGEP(builder, context_ptr, indices, Elements(indices), "");
 116
 117    if (emit_load)
 118       res = LLVMBuildLoad(builder, ptr, "");
 119    else
 120       res = ptr;
 121
 122    lp_build_name(res, "context.texture%u.%s", texture_unit, member_name);
 123
 124    return res;
 125 }
 126
 127
 128 /**
 129  * Helper macro to instantiate the functions that generate the code to
 130  * fetch the members of lp_jit_texture to fulfill the sampler code
 131  * generator requests.
 132  *
 133  * This complexity is the price we have to pay to keep the texture
 134  * sampler code generator a reusable module without dependencies to
 135  * llvmpipe internals.
 136  */
 137 #define LP_LLVM_TEXTURE_MEMBER(_name, _index, _emit_load)  \
 138    static LLVMValueRef \
 139    lp_llvm_texture_##_name( const struct lp_sampler_dynamic_state *base, \
 140                             struct gallivm_state *gallivm, \
 141                             LLVMValueRef context_ptr, \
 142                             unsigned texture_unit) \
 143    { \
 144       return lp_llvm_texture_member(base, gallivm, context_ptr, \
 145                                     texture_unit, _index, #_name, _emit_load ); \
 146    }
 147
 148
 149 LP_LLVM_TEXTURE_MEMBER(width,      LP_JIT_TEXTURE_WIDTH, TRUE)
 150 LP_LLVM_TEXTURE_MEMBER(height,     LP_JIT_TEXTURE_HEIGHT, TRUE)
 151 LP_LLVM_TEXTURE_MEMBER(depth,      LP_JIT_TEXTURE_DEPTH, TRUE)
 152 LP_LLVM_TEXTURE_MEMBER(first_level, LP_JIT_TEXTURE_FIRST_LEVEL, TRUE)
 153 LP_LLVM_TEXTURE_MEMBER(last_level, LP_JIT_TEXTURE_LAST_LEVEL, TRUE)
 154 LP_LLVM_TEXTURE_MEMBER(base_ptr,   LP_JIT_TEXTURE_BASE, TRUE)
 155 LP_LLVM_TEXTURE_MEMBER(row_stride, LP_JIT_TEXTURE_ROW_STRIDE, FALSE)
 156 LP_LLVM_TEXTURE_MEMBER(img_stride, LP_JIT_TEXTURE_IMG_STRIDE, FALSE)
 157 LP_LLVM_TEXTURE_MEMBER(mip_offsets, LP_JIT_TEXTURE_MIP_OFFSETS, FALSE)
 158
 159
 160 /**
 161  * Fetch the specified member of the lp_jit_sampler structure.
 162  * \param emit_load  if TRUE, emit the LLVM load instruction to actually
 163  *                   fetch the field's value.  Otherwise, just emit the
 164  *                   GEP code to address the field.
 165  *
 166  * @sa http://llvm.org/docs/GetElementPtr.html
 167  */
 168 static LLVMValueRef
 169 lp_llvm_sampler_member(const struct lp_sampler_dynamic_state *base,
 170                        struct gallivm_state *gallivm,
 171                        LLVMValueRef context_ptr,
 172                        unsigned sampler_unit,
 173                        unsigned member_index,
 174                        const char *member_name,
 175                        boolean emit_load)
 176 {
 177    LLVMBuilderRef builder = gallivm->builder;
 178    LLVMValueRef indices[4];
 179    LLVMValueRef ptr;
 180    LLVMValueRef res;
 181
 182    assert(sampler_unit < PIPE_MAX_SAMPLERS);
 183
 184    /* context[0] */
 185    indices[0] = lp_build_const_int32(gallivm, 0);
 186    /* context[0].samplers */
 187    indices[1] = lp_build_const_int32(gallivm, LP_JIT_CTX_SAMPLERS);
 188    /* context[0].samplers[unit] */
 189    indices[2] = lp_build_const_int32(gallivm, sampler_unit);
 190    /* context[0].samplers[unit].member */
 191    indices[3] = lp_build_const_int32(gallivm, member_index);
 192
 193    ptr = LLVMBuildGEP(builder, context_ptr, indices, Elements(indices), "");
 194
 195    if (emit_load)
 196       res = LLVMBuildLoad(builder, ptr, "");
 197    else
 198       res = ptr;
 199
 200    lp_build_name(res, "context.sampler%u.%s", sampler_unit, member_name);
 201
 202    return res;
 203 }
 204
 205
 206 #define LP_LLVM_SAMPLER_MEMBER(_name, _index, _emit_load)  \
 207    static LLVMValueRef \
 208    lp_llvm_sampler_##_name( const struct lp_sampler_dynamic_state *base, \
 209                             struct gallivm_state *gallivm, \
 210                             LLVMValueRef context_ptr, \
 211                             unsigned sampler_unit) \
 212    { \
 213       return lp_llvm_sampler_member(base, gallivm, context_ptr, \
 214                                     sampler_unit, _index, #_name, _emit_load ); \
 215    }
 216
 217
 218 LP_LLVM_SAMPLER_MEMBER(min_lod,    LP_JIT_SAMPLER_MIN_LOD, TRUE)
 219 LP_LLVM_SAMPLER_MEMBER(max_lod,    LP_JIT_SAMPLER_MAX_LOD, TRUE)
 220 LP_LLVM_SAMPLER_MEMBER(lod_bias,   LP_JIT_SAMPLER_LOD_BIAS, TRUE)
 221 LP_LLVM_SAMPLER_MEMBER(border_color, LP_JIT_SAMPLER_BORDER_COLOR, FALSE)
 222
 223
 224 static void
 225 lp_llvm_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
 226 {
 227    FREE(sampler);
 228 }
 229
 230
 231 /**
 232  * Fetch filtered values from texture.
 233  * The 'texel' parameter returns four vectors corresponding to R, G, B, A.
 234  */
 235 static void
 236 lp_llvm_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa *base,
 237                                      struct gallivm_state *gallivm,
 238                                      const struct lp_sampler_params *params)
 239 {
 240    struct lp_llvm_sampler_soa *sampler = (struct lp_llvm_sampler_soa *)base;
 241    unsigned texture_index = params->texture_index;
 242    unsigned sampler_index = params->sampler_index;
 243
 244    assert(sampler_index < PIPE_MAX_SAMPLERS);
 245    assert(texture_index < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 246
 247    if (LP_PERF & PERF_NO_TEX) {
 248       lp_build_sample_nop(gallivm, params->type, params->coords, params->texel);
 249       return;
 250    }
 251
 252    lp_build_sample_soa(&sampler->dynamic_state.static_state[texture_index].texture_state,
 253                        &sampler->dynamic_state.static_state[sampler_index].sampler_state,
 254                        &sampler->dynamic_state.base,
 255                        gallivm, params);
 256 }
 257
 258 /**
 259  * Fetch the texture size.
 260  */
 261 static void
 262 lp_llvm_sampler_soa_emit_size_query(const struct lp_build_sampler_soa *base,
 263                                     struct gallivm_state *gallivm,
 264                                     struct lp_type type,
 265                                     unsigned texture_unit,
 266                                     unsigned target,
 267                                     LLVMValueRef context_ptr,
 268                                     boolean is_sviewinfo,
 269                                     enum lp_sampler_lod_property lod_property,
 270                                     LLVMValueRef explicit_lod, /* optional */
 271                                     LLVMValueRef *sizes_out)
 272 {
 273    struct lp_llvm_sampler_soa *sampler = (struct lp_llvm_sampler_soa *)base;
 274
 275    assert(texture_unit < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 276
 277    lp_build_size_query_soa(gallivm,
 278                            &sampler->dynamic_state.static_state[texture_unit].texture_state,
 279                            &sampler->dynamic_state.base,
 280                            type,
 281                            texture_unit,
 282                            target,
 283                            context_ptr,
 284                            is_sviewinfo,
 285                            lod_property,
 286                            explicit_lod,
 287                            sizes_out);
 288 }
 289
 290
 291 struct lp_build_sampler_soa *
 292 lp_llvm_sampler_soa_create(const struct lp_sampler_static_state *static_state)
 293 {
 294    struct lp_llvm_sampler_soa *sampler;
 295
 296    sampler = CALLOC_STRUCT(lp_llvm_sampler_soa);
 297    if(!sampler)
 298       return NULL;
 299
 300    sampler->base.destroy = lp_llvm_sampler_soa_destroy;
 301    sampler->base.emit_tex_sample = lp_llvm_sampler_soa_emit_fetch_texel;
 302    sampler->base.emit_size_query = lp_llvm_sampler_soa_emit_size_query;
 303    sampler->dynamic_state.base.width = lp_llvm_texture_width;
 304    sampler->dynamic_state.base.height = lp_llvm_texture_height;
 305    sampler->dynamic_state.base.depth = lp_llvm_texture_depth;
 306    sampler->dynamic_state.base.first_level = lp_llvm_texture_first_level;
 307    sampler->dynamic_state.base.last_level = lp_llvm_texture_last_level;
 308    sampler->dynamic_state.base.base_ptr = lp_llvm_texture_base_ptr;
 309    sampler->dynamic_state.base.row_stride = lp_llvm_texture_row_stride;
 310    sampler->dynamic_state.base.img_stride = lp_llvm_texture_img_stride;
 311    sampler->dynamic_state.base.mip_offsets = lp_llvm_texture_mip_offsets;
 312    sampler->dynamic_state.base.min_lod = lp_llvm_sampler_min_lod;
 313    sampler->dynamic_state.base.max_lod = lp_llvm_sampler_max_lod;
 314    sampler->dynamic_state.base.lod_bias = lp_llvm_sampler_lod_bias;
 315    sampler->dynamic_state.base.border_color = lp_llvm_sampler_border_color;
 316
 317    sampler->dynamic_state.static_state = static_state;
 318
 319    return &sampler->base;
 320 }
 321