workbench/libs/mesa/src/gallium/auxiliary/draw/draw_llvm_sample.c

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   3  * Copyright 2010 VMware, Inc.
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  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  */
  57 struct 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  */
  70 struct 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  */
  86 static LLVMValueRef
  87 draw_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
 144 DRAW_LLVM_TEXTURE_MEMBER(width,      DRAW_JIT_TEXTURE_WIDTH, TRUE)
 145 DRAW_LLVM_TEXTURE_MEMBER(height,     DRAW_JIT_TEXTURE_HEIGHT, TRUE)
 146 DRAW_LLVM_TEXTURE_MEMBER(depth,      DRAW_JIT_TEXTURE_DEPTH, TRUE)
 147 DRAW_LLVM_TEXTURE_MEMBER(first_level,DRAW_JIT_TEXTURE_FIRST_LEVEL, TRUE)
 148 DRAW_LLVM_TEXTURE_MEMBER(last_level, DRAW_JIT_TEXTURE_LAST_LEVEL, TRUE)
 149 DRAW_LLVM_TEXTURE_MEMBER(row_stride, DRAW_JIT_TEXTURE_ROW_STRIDE, FALSE)
 150 DRAW_LLVM_TEXTURE_MEMBER(img_stride, DRAW_JIT_TEXTURE_IMG_STRIDE, FALSE)
 151 DRAW_LLVM_TEXTURE_MEMBER(data_ptr,   DRAW_JIT_TEXTURE_DATA, FALSE)
 152 DRAW_LLVM_TEXTURE_MEMBER(min_lod,    DRAW_JIT_TEXTURE_MIN_LOD, TRUE)
 153 DRAW_LLVM_TEXTURE_MEMBER(max_lod,    DRAW_JIT_TEXTURE_MAX_LOD, TRUE)
 154 DRAW_LLVM_TEXTURE_MEMBER(lod_bias,   DRAW_JIT_TEXTURE_LOD_BIAS, TRUE)
 155 DRAW_LLVM_TEXTURE_MEMBER(border_color, DRAW_JIT_TEXTURE_BORDER_COLOR, FALSE)
 156
 157
 158 static void
 159 draw_llvm_sampler_soa_destroy(struct lp_build_sampler_soa *sampler)
 160 {
 161    FREE(sampler);
 162 }
 163
 164
 165 /**
 166  * Fetch filtered values from texture.
 167  * The 'texel' parameter returns four vectors corresponding to R, G, B, A.
 168  */
 169 static void
 170 draw_llvm_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa *base,
 171                                        struct gallivm_state *gallivm,
 172                                        struct lp_type type,
 173                                        unsigned unit,
 174                                        unsigned num_coords,
 175                                        const LLVMValueRef *coords,
 176                                        const LLVMValueRef *ddx,
 177                                        const LLVMValueRef *ddy,
 178                                        LLVMValueRef lod_bias, /* optional */
 179                                        LLVMValueRef explicit_lod, /* optional */
 180                                        LLVMValueRef *texel)
 181 {
 182    struct draw_llvm_sampler_soa *sampler = (struct draw_llvm_sampler_soa *)base;
 183
 184    assert(unit < PIPE_MAX_VERTEX_SAMPLERS);
 185
 186    lp_build_sample_soa(gallivm,
 187                        &sampler->dynamic_state.static_state[unit],
 188                        &sampler->dynamic_state.base,
 189                        type,
 190                        unit,
 191                        num_coords, coords,
 192                        ddx, ddy,
 193                        lod_bias, explicit_lod,
 194                        texel);
 195 }
 196
 197
 198 struct lp_build_sampler_soa *
 199 draw_llvm_sampler_soa_create(const struct lp_sampler_static_state *static_state,
 200                              LLVMValueRef context_ptr)
 201 {
 202    struct draw_llvm_sampler_soa *sampler;
 203
 204    sampler = CALLOC_STRUCT(draw_llvm_sampler_soa);
 205    if(!sampler)
 206       return NULL;
 207
 208    sampler->base.destroy = draw_llvm_sampler_soa_destroy;
 209    sampler->base.emit_fetch_texel = draw_llvm_sampler_soa_emit_fetch_texel;
 210    sampler->dynamic_state.base.width = draw_llvm_texture_width;
 211    sampler->dynamic_state.base.height = draw_llvm_texture_height;
 212    sampler->dynamic_state.base.depth = draw_llvm_texture_depth;
 213    sampler->dynamic_state.base.first_level = draw_llvm_texture_first_level;
 214    sampler->dynamic_state.base.last_level = draw_llvm_texture_last_level;
 215    sampler->dynamic_state.base.row_stride = draw_llvm_texture_row_stride;
 216    sampler->dynamic_state.base.img_stride = draw_llvm_texture_img_stride;
 217    sampler->dynamic_state.base.data_ptr = draw_llvm_texture_data_ptr;
 218    sampler->dynamic_state.base.min_lod = draw_llvm_texture_min_lod;
 219    sampler->dynamic_state.base.max_lod = draw_llvm_texture_max_lod;
 220    sampler->dynamic_state.base.lod_bias = draw_llvm_texture_lod_bias;
 221    sampler->dynamic_state.base.border_color = draw_llvm_texture_border_color;
 222    sampler->dynamic_state.static_state = static_state;
 223    sampler->dynamic_state.context_ptr = context_ptr;
 224
 225    return &sampler->base;
 226 }
 227