src/gallium/auxiliary/gallivm/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 "lp_bld_type.h"
  50 #include "lp_bld_const.h"
  51 #include "lp_bld_arit.h"
  52 #include "lp_bld_logic.h"
  53 #include "lp_bld_swizzle.h"
  54 #include "lp_bld_blend.h"
  55 #include "lp_bld_debug.h"
  56
  57
  58 /**
  59  * We may the same values several times, so we keep them here to avoid
  60  * recomputing them. Also reusing the values allows us to do simplifications
  61  * that LLVM optimization passes wouldn't normally be able to do.
  62  */
  63 struct lp_build_blend_aos_context
  64 {
  65    struct lp_build_context base;
  66
  67    LLVMValueRef src;
  68    LLVMValueRef dst;
  69    LLVMValueRef const_;
  70
  71    LLVMValueRef inv_src;
  72    LLVMValueRef inv_dst;
  73    LLVMValueRef inv_const;
  74    LLVMValueRef saturate;
  75
  76    LLVMValueRef rgb_src_factor;
  77    LLVMValueRef alpha_src_factor;
  78    LLVMValueRef rgb_dst_factor;
  79    LLVMValueRef alpha_dst_factor;
  80 };
  81
  82
  83 static LLVMValueRef
  84 lp_build_blend_factor_unswizzled(struct lp_build_blend_aos_context *bld,
  85                                  unsigned factor,
  86                                  boolean alpha)
  87 {
  88    switch (factor) {
  89    case PIPE_BLENDFACTOR_ZERO:
  90       return bld->base.zero;
  91    case PIPE_BLENDFACTOR_ONE:
  92       return bld->base.one;
  93    case PIPE_BLENDFACTOR_SRC_COLOR:
  94    case PIPE_BLENDFACTOR_SRC_ALPHA:
  95       return bld->src;
  96    case PIPE_BLENDFACTOR_DST_COLOR:
  97    case PIPE_BLENDFACTOR_DST_ALPHA:
  98       return bld->dst;
  99    case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
 100       if(alpha)
 101          return bld->base.one;
 102       else {
 103          if(!bld->inv_dst)
 104             bld->inv_dst = lp_build_comp(&bld->base, bld->dst);
 105          if(!bld->saturate)
 106             bld->saturate = lp_build_min(&bld->base, bld->src, bld->inv_dst);
 107          return bld->saturate;
 108       }
 109    case PIPE_BLENDFACTOR_CONST_COLOR:
 110    case PIPE_BLENDFACTOR_CONST_ALPHA:
 111       return bld->const_;
 112    case PIPE_BLENDFACTOR_SRC1_COLOR:
 113    case PIPE_BLENDFACTOR_SRC1_ALPHA:
 114       /* TODO */
 115       assert(0);
 116       return bld->base.zero;
 117    case PIPE_BLENDFACTOR_INV_SRC_COLOR:
 118    case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
 119       if(!bld->inv_src)
 120          bld->inv_src = lp_build_comp(&bld->base, bld->src);
 121       return bld->inv_src;
 122    case PIPE_BLENDFACTOR_INV_DST_COLOR:
 123    case PIPE_BLENDFACTOR_INV_DST_ALPHA:
 124       if(!bld->inv_dst)
 125          bld->inv_dst = lp_build_comp(&bld->base, bld->dst);
 126       return bld->inv_dst;
 127    case PIPE_BLENDFACTOR_INV_CONST_COLOR:
 128    case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
 129       if(!bld->inv_const)
 130          bld->inv_const = lp_build_comp(&bld->base, bld->const_);
 131       return bld->inv_const;
 132    case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
 133    case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
 134       /* TODO */
 135       assert(0);
 136       return bld->base.zero;
 137    default:
 138       assert(0);
 139       return bld->base.zero;
 140    }
 141 }
 142
 143
 144 enum lp_build_blend_swizzle {
 145    LP_BUILD_BLEND_SWIZZLE_RGBA = 0,
 146    LP_BUILD_BLEND_SWIZZLE_AAAA = 1
 147 };
 148
 149
 150 /**
 151  * How should we shuffle the base factor.
 152  */
 153 static enum lp_build_blend_swizzle
 154 lp_build_blend_factor_swizzle(unsigned factor)
 155 {
 156    switch (factor) {
 157    case PIPE_BLENDFACTOR_ONE:
 158    case PIPE_BLENDFACTOR_ZERO:
 159    case PIPE_BLENDFACTOR_SRC_COLOR:
 160    case PIPE_BLENDFACTOR_DST_COLOR:
 161    case PIPE_BLENDFACTOR_CONST_COLOR:
 162    case PIPE_BLENDFACTOR_SRC1_COLOR:
 163    case PIPE_BLENDFACTOR_INV_SRC_COLOR:
 164    case PIPE_BLENDFACTOR_INV_DST_COLOR:
 165    case PIPE_BLENDFACTOR_INV_CONST_COLOR:
 166    case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
 167       return LP_BUILD_BLEND_SWIZZLE_RGBA;
 168    case PIPE_BLENDFACTOR_SRC_ALPHA:
 169    case PIPE_BLENDFACTOR_DST_ALPHA:
 170    case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
 171    case PIPE_BLENDFACTOR_SRC1_ALPHA:
 172    case PIPE_BLENDFACTOR_CONST_ALPHA:
 173    case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
 174    case PIPE_BLENDFACTOR_INV_DST_ALPHA:
 175    case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
 176    case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
 177       return LP_BUILD_BLEND_SWIZZLE_AAAA;
 178    default:
 179       assert(0);
 180       return LP_BUILD_BLEND_SWIZZLE_RGBA;
 181    }
 182 }
 183
 184
 185 static LLVMValueRef
 186 lp_build_blend_swizzle(struct lp_build_blend_aos_context *bld,
 187                        LLVMValueRef rgb,
 188                        LLVMValueRef alpha,
 189                        enum lp_build_blend_swizzle rgb_swizzle,
 190                        unsigned alpha_swizzle)
 191 {
 192    if(rgb == alpha) {
 193       if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_RGBA)
 194          return rgb;
 195       if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_AAAA)
 196          return lp_build_broadcast_aos(&bld->base, rgb, alpha_swizzle);
 197    }
 198    else {
 199       if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_RGBA) {
 200          boolean cond[4] = {0, 0, 0, 0};
 201          cond[alpha_swizzle] = 1;
 202          return lp_build_select_aos(&bld->base, alpha, rgb, cond);
 203       }
 204       if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_AAAA) {
 205          unsigned char swizzle[4];
 206          swizzle[0] = alpha_swizzle;
 207          swizzle[1] = alpha_swizzle;
 208          swizzle[2] = alpha_swizzle;
 209          swizzle[3] = alpha_swizzle;
 210          swizzle[alpha_swizzle] += 4;
 211          return lp_build_swizzle2_aos(&bld->base, rgb, alpha, swizzle);
 212       }
 213    }
 214    assert(0);
 215    return bld->base.undef;
 216 }
 217
 218
 219 /**
 220  * @sa http://www.opengl.org/sdk/docs/man/xhtml/glBlendFuncSeparate.xml
 221  */
 222 static LLVMValueRef
 223 lp_build_blend_factor(struct lp_build_blend_aos_context *bld,
 224                       LLVMValueRef factor1,
 225                       unsigned rgb_factor,
 226                       unsigned alpha_factor,
 227                       unsigned alpha_swizzle)
 228 {
 229    LLVMValueRef rgb_factor_;
 230    LLVMValueRef alpha_factor_;
 231    LLVMValueRef factor2;
 232    enum lp_build_blend_swizzle rgb_swizzle;
 233
 234    rgb_factor_   = lp_build_blend_factor_unswizzled(bld, rgb_factor,   FALSE);
 235    alpha_factor_ = lp_build_blend_factor_unswizzled(bld, alpha_factor, TRUE);
 236
 237    rgb_swizzle = lp_build_blend_factor_swizzle(rgb_factor);
 238
 239    factor2 = lp_build_blend_swizzle(bld, rgb_factor_, alpha_factor_, rgb_swizzle, alpha_swizzle);
 240
 241    return lp_build_mul(&bld->base, factor1, factor2);
 242 }
 243
 244
 245 boolean
 246 lp_build_blend_func_commutative(unsigned func)
 247 {
 248    switch (func) {
 249    case PIPE_BLEND_ADD:
 250    case PIPE_BLEND_MIN:
 251    case PIPE_BLEND_MAX:
 252       return TRUE;
 253    case PIPE_BLEND_SUBTRACT:
 254    case PIPE_BLEND_REVERSE_SUBTRACT:
 255       return FALSE;
 256    default:
 257       assert(0);
 258       return TRUE;
 259    }
 260 }
 261
 262
 263 boolean
 264 lp_build_blend_func_reverse(unsigned rgb_func, unsigned alpha_func)
 265 {
 266    if(rgb_func == alpha_func)
 267       return FALSE;
 268    if(rgb_func == PIPE_BLEND_SUBTRACT && alpha_func == PIPE_BLEND_REVERSE_SUBTRACT)
 269       return TRUE;
 270    if(rgb_func == PIPE_BLEND_REVERSE_SUBTRACT && alpha_func == PIPE_BLEND_SUBTRACT)
 271       return TRUE;
 272    return FALSE;
 273 }
 274
 275
 276 /**
 277  * @sa http://www.opengl.org/sdk/docs/man/xhtml/glBlendEquationSeparate.xml
 278  */
 279 LLVMValueRef
 280 lp_build_blend_func(struct lp_build_context *bld,
 281                     unsigned func,
 282                     LLVMValueRef term1,
 283                     LLVMValueRef term2)
 284 {
 285    switch (func) {
 286    case PIPE_BLEND_ADD:
 287       return lp_build_add(bld, term1, term2);
 288       break;
 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 }