src/gallium/drivers/llvmpipe/lp_bld_blend_aos.c

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  27
  28
  29 /**
  30  * @file
  31  * Blend LLVM IR generation -- AoS layout.
  32  *
  33  * AoS blending is in general much slower than SoA, but there are some cases
  34  * where it might be faster. In particular, if a pixel is rendered only once
  35  * then the overhead of tiling and untiling will dominate over the speedup that
  36  * SoA gives. So we might want to detect such cases and fallback to AoS in the
  37  * future, but for now this function is here for historical/benchmarking
  38  * purposes.
  39  *
  40  * Run lp_blend_test after any change to this file.
  41  *
  42  * @author Jose Fonseca <jfonseca@vmware.com>
  43  */
  44
  45
  46 #include "pipe/p_state.h"
  47 #include "util/u_debug.h"
  48
  49 #include "gallivm/lp_bld_type.h"
  50 #include "gallivm/lp_bld_const.h"
  51 #include "gallivm/lp_bld_arit.h"
  52 #include "gallivm/lp_bld_logic.h"
  53 #include "gallivm/lp_bld_swizzle.h"
  54 #include "gallivm/lp_bld_debug.h"
  55
  56 #include "lp_bld_blend.h"
  57
  58
  59 /**
  60  * We may the same values several times, so we keep them here to avoid
  61  * recomputing them. Also reusing the values allows us to do simplifications
  62  * that LLVM optimization passes wouldn't normally be able to do.
  63  */
  64 struct lp_build_blend_aos_context
  65 {
  66    struct lp_build_context base;
  67
  68    LLVMValueRef src;
  69    LLVMValueRef dst;
  70    LLVMValueRef const_;
  71
  72    LLVMValueRef inv_src;
  73    LLVMValueRef inv_dst;
  74    LLVMValueRef inv_const;
  75    LLVMValueRef saturate;
  76
  77    LLVMValueRef rgb_src_factor;
  78    LLVMValueRef alpha_src_factor;
  79    LLVMValueRef rgb_dst_factor;
  80    LLVMValueRef alpha_dst_factor;
  81 };
  82
  83
  84 static LLVMValueRef
  85 lp_build_blend_factor_unswizzled(struct lp_build_blend_aos_context *bld,
  86                                  unsigned factor,
  87                                  boolean alpha)
  88 {
  89    switch (factor) {
  90    case PIPE_BLENDFACTOR_ZERO:
  91       return bld->base.zero;
  92    case PIPE_BLENDFACTOR_ONE:
  93       return bld->base.one;
  94    case PIPE_BLENDFACTOR_SRC_COLOR:
  95    case PIPE_BLENDFACTOR_SRC_ALPHA:
  96       return bld->src;
  97    case PIPE_BLENDFACTOR_DST_COLOR:
  98    case PIPE_BLENDFACTOR_DST_ALPHA:
  99       return bld->dst;
 100    case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
 101       if(alpha)
 102          return bld->base.one;
 103       else {
 104          if(!bld->inv_dst)
 105             bld->inv_dst = lp_build_comp(&bld->base, bld->dst);
 106          if(!bld->saturate)
 107             bld->saturate = lp_build_min(&bld->base, bld->src, bld->inv_dst);
 108          return bld->saturate;
 109       }
 110    case PIPE_BLENDFACTOR_CONST_COLOR:
 111    case PIPE_BLENDFACTOR_CONST_ALPHA:
 112       return bld->const_;
 113    case PIPE_BLENDFACTOR_SRC1_COLOR:
 114    case PIPE_BLENDFACTOR_SRC1_ALPHA:
 115       /* TODO */
 116       assert(0);
 117       return bld->base.zero;
 118    case PIPE_BLENDFACTOR_INV_SRC_COLOR:
 119    case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
 120       if(!bld->inv_src)
 121          bld->inv_src = lp_build_comp(&bld->base, bld->src);
 122       return bld->inv_src;
 123    case PIPE_BLENDFACTOR_INV_DST_COLOR:
 124    case PIPE_BLENDFACTOR_INV_DST_ALPHA:
 125       if(!bld->inv_dst)
 126          bld->inv_dst = lp_build_comp(&bld->base, bld->dst);
 127       return bld->inv_dst;
 128    case PIPE_BLENDFACTOR_INV_CONST_COLOR:
 129    case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
 130       if(!bld->inv_const)
 131          bld->inv_const = lp_build_comp(&bld->base, bld->const_);
 132       return bld->inv_const;
 133    case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
 134    case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
 135       /* TODO */
 136       assert(0);
 137       return bld->base.zero;
 138    default:
 139       assert(0);
 140       return bld->base.zero;
 141    }
 142 }
 143
 144
 145 enum lp_build_blend_swizzle {
 146    LP_BUILD_BLEND_SWIZZLE_RGBA = 0,
 147    LP_BUILD_BLEND_SWIZZLE_AAAA = 1
 148 };
 149
 150
 151 /**
 152  * How should we shuffle the base factor.
 153  */
 154 static enum lp_build_blend_swizzle
 155 lp_build_blend_factor_swizzle(unsigned factor)
 156 {
 157    switch (factor) {
 158    case PIPE_BLENDFACTOR_ONE:
 159    case PIPE_BLENDFACTOR_ZERO:
 160    case PIPE_BLENDFACTOR_SRC_COLOR:
 161    case PIPE_BLENDFACTOR_DST_COLOR:
 162    case PIPE_BLENDFACTOR_CONST_COLOR:
 163    case PIPE_BLENDFACTOR_SRC1_COLOR:
 164    case PIPE_BLENDFACTOR_INV_SRC_COLOR:
 165    case PIPE_BLENDFACTOR_INV_DST_COLOR:
 166    case PIPE_BLENDFACTOR_INV_CONST_COLOR:
 167    case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
 168       return LP_BUILD_BLEND_SWIZZLE_RGBA;
 169    case PIPE_BLENDFACTOR_SRC_ALPHA:
 170    case PIPE_BLENDFACTOR_DST_ALPHA:
 171    case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
 172    case PIPE_BLENDFACTOR_SRC1_ALPHA:
 173    case PIPE_BLENDFACTOR_CONST_ALPHA:
 174    case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
 175    case PIPE_BLENDFACTOR_INV_DST_ALPHA:
 176    case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
 177    case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
 178       return LP_BUILD_BLEND_SWIZZLE_AAAA;
 179    default:
 180       assert(0);
 181       return LP_BUILD_BLEND_SWIZZLE_RGBA;
 182    }
 183 }
 184
 185
 186 static LLVMValueRef
 187 lp_build_blend_swizzle(struct lp_build_blend_aos_context *bld,
 188                        LLVMValueRef rgb,
 189                        LLVMValueRef alpha,
 190                        enum lp_build_blend_swizzle rgb_swizzle,
 191                        unsigned alpha_swizzle)
 192 {
 193    if(rgb == alpha) {
 194       if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_RGBA)
 195          return rgb;
 196       if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_AAAA)
 197          return lp_build_broadcast_aos(&bld->base, rgb, alpha_swizzle);
 198    }
 199    else {
 200       if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_RGBA) {
 201          boolean cond[4] = {0, 0, 0, 0};
 202          cond[alpha_swizzle] = 1;
 203          return lp_build_select_aos(&bld->base, alpha, rgb, cond);
 204       }
 205       if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_AAAA) {
 206          unsigned char swizzle[4];
 207          swizzle[0] = alpha_swizzle;
 208          swizzle[1] = alpha_swizzle;
 209          swizzle[2] = alpha_swizzle;
 210          swizzle[3] = alpha_swizzle;
 211          swizzle[alpha_swizzle] += 4;
 212          return lp_build_swizzle2_aos(&bld->base, rgb, alpha, swizzle);
 213       }
 214    }
 215    assert(0);
 216    return bld->base.undef;
 217 }
 218
 219
 220 /**
 221  * @sa http://www.opengl.org/sdk/docs/man/xhtml/glBlendFuncSeparate.xml
 222  */
 223 static LLVMValueRef
 224 lp_build_blend_factor(struct lp_build_blend_aos_context *bld,
 225                       LLVMValueRef factor1,
 226                       unsigned rgb_factor,
 227                       unsigned alpha_factor,
 228                       unsigned alpha_swizzle)
 229 {
 230    LLVMValueRef rgb_factor_;
 231    LLVMValueRef alpha_factor_;
 232    LLVMValueRef factor2;
 233    enum lp_build_blend_swizzle rgb_swizzle;
 234
 235    rgb_factor_   = lp_build_blend_factor_unswizzled(bld, rgb_factor,   FALSE);
 236    alpha_factor_ = lp_build_blend_factor_unswizzled(bld, alpha_factor, TRUE);
 237
 238    rgb_swizzle = lp_build_blend_factor_swizzle(rgb_factor);
 239
 240    factor2 = lp_build_blend_swizzle(bld, rgb_factor_, alpha_factor_, rgb_swizzle, alpha_swizzle);
 241
 242    return lp_build_mul(&bld->base, factor1, factor2);
 243 }
 244
 245
 246 boolean
 247 lp_build_blend_func_commutative(unsigned func)
 248 {
 249    switch (func) {
 250    case PIPE_BLEND_ADD:
 251    case PIPE_BLEND_MIN:
 252    case PIPE_BLEND_MAX:
 253       return TRUE;
 254    case PIPE_BLEND_SUBTRACT:
 255    case PIPE_BLEND_REVERSE_SUBTRACT:
 256       return FALSE;
 257    default:
 258       assert(0);
 259       return TRUE;
 260    }
 261 }
 262
 263
 264 boolean
 265 lp_build_blend_func_reverse(unsigned rgb_func, unsigned alpha_func)
 266 {
 267    if(rgb_func == alpha_func)
 268       return FALSE;
 269    if(rgb_func == PIPE_BLEND_SUBTRACT && alpha_func == PIPE_BLEND_REVERSE_SUBTRACT)
 270       return TRUE;
 271    if(rgb_func == PIPE_BLEND_REVERSE_SUBTRACT && alpha_func == PIPE_BLEND_SUBTRACT)
 272       return TRUE;
 273    return FALSE;
 274 }
 275
 276
 277 /**
 278  * @sa http://www.opengl.org/sdk/docs/man/xhtml/glBlendEquationSeparate.xml
 279  */
 280 LLVMValueRef
 281 lp_build_blend_func(struct lp_build_context *bld,
 282                     unsigned func,
 283                     LLVMValueRef term1,
 284                     LLVMValueRef term2)
 285 {
 286    switch (func) {
 287    case PIPE_BLEND_ADD:
 288       return lp_build_add(bld, term1, term2);
 289    case PIPE_BLEND_SUBTRACT:
 290       return lp_build_sub(bld, term1, term2);
 291    case PIPE_BLEND_REVERSE_SUBTRACT:
 292       return lp_build_sub(bld, term2, term1);
 293    case PIPE_BLEND_MIN:
 294       return lp_build_min(bld, term1, term2);
 295    case PIPE_BLEND_MAX:
 296       return lp_build_max(bld, term1, term2);
 297    default:
 298       assert(0);
 299       return bld->zero;
 300    }
 301 }
 302
 303
 304 LLVMValueRef
 305 lp_build_blend_aos(LLVMBuilderRef builder,
 306                    const struct pipe_blend_state *blend,
 307                    struct lp_type type,
 308                    LLVMValueRef src,
 309                    LLVMValueRef dst,
 310                    LLVMValueRef const_,
 311                    unsigned alpha_swizzle)
 312 {
 313    struct lp_build_blend_aos_context bld;
 314    LLVMValueRef src_term;
 315    LLVMValueRef dst_term;
 316
 317    /* FIXME */
 318    assert(blend->independent_blend_enable == 0);
 319    assert(blend->rt[0].colormask == 0xf);
 320
 321    if(!blend->rt[0].blend_enable)
 322       return src;
 323
 324    /* It makes no sense to blend unless values are normalized */
 325    assert(type.norm);
 326
 327    /* Setup build context */
 328    memset(&bld, 0, sizeof bld);
 329    lp_build_context_init(&bld.base, builder, type);
 330    bld.src = src;
 331    bld.dst = dst;
 332    bld.const_ = const_;
 333
 334    /* TODO: There are still a few optimization opportunities here. For certain
 335     * combinations it is possible to reorder the operations and therefore saving
 336     * some instructions. */
 337
 338    src_term = lp_build_blend_factor(&bld, src, blend->rt[0].rgb_src_factor,
 339                                     blend->rt[0].alpha_src_factor, alpha_swizzle);
 340    dst_term = lp_build_blend_factor(&bld, dst, blend->rt[0].rgb_dst_factor,
 341                                     blend->rt[0].alpha_dst_factor, alpha_swizzle);
 342
 343    lp_build_name(src_term, "src_term");
 344    lp_build_name(dst_term, "dst_term");
 345
 346    if(blend->rt[0].rgb_func == blend->rt[0].alpha_func) {
 347       return lp_build_blend_func(&bld.base, blend->rt[0].rgb_func, src_term, dst_term);
 348    }
 349    else {
 350       /* Seperate RGB / A functions */
 351
 352       LLVMValueRef rgb;
 353       LLVMValueRef alpha;
 354
 355       rgb   = lp_build_blend_func(&bld.base, blend->rt[0].rgb_func,   src_term, dst_term);
 356       alpha = lp_build_blend_func(&bld.base, blend->rt[0].alpha_func, src_term, dst_term);
 357
 358       return lp_build_blend_swizzle(&bld, rgb, alpha, LP_BUILD_BLEND_SWIZZLE_RGBA, alpha_swizzle);
 359    }
 360 }