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 #include "util/u_format.h"
  49
  50 #include "gallivm/lp_bld_type.h"
  51 #include "gallivm/lp_bld_const.h"
  52 #include "gallivm/lp_bld_arit.h"
  53 #include "gallivm/lp_bld_logic.h"
  54 #include "gallivm/lp_bld_swizzle.h"
  55 #include "gallivm/lp_bld_bitarit.h"
  56 #include "gallivm/lp_bld_debug.h"
  57
  58 #include "lp_bld_blend.h"
  59
  60
  61 /**
  62  * We may the same values several times, so we keep them here to avoid
  63  * recomputing them. Also reusing the values allows us to do simplifications
  64  * that LLVM optimization passes wouldn't normally be able to do.
  65  */
  66 struct lp_build_blend_aos_context
  67 {
  68    struct lp_build_context base;
  69
  70    LLVMValueRef src;
  71    LLVMValueRef dst;
  72    LLVMValueRef const_;
  73
  74    LLVMValueRef inv_src;
  75    LLVMValueRef inv_dst;
  76    LLVMValueRef inv_const;
  77    LLVMValueRef saturate;
  78
  79    LLVMValueRef rgb_src_factor;
  80    LLVMValueRef alpha_src_factor;
  81    LLVMValueRef rgb_dst_factor;
  82    LLVMValueRef alpha_dst_factor;
  83 };
  84
  85
  86 static LLVMValueRef
  87 lp_build_blend_factor_unswizzled(struct lp_build_blend_aos_context *bld,
  88                                  unsigned factor,
  89                                  boolean alpha)
  90 {
  91    switch (factor) {
  92    case PIPE_BLENDFACTOR_ZERO:
  93       return bld->base.zero;
  94    case PIPE_BLENDFACTOR_ONE:
  95       return bld->base.one;
  96    case PIPE_BLENDFACTOR_SRC_COLOR:
  97    case PIPE_BLENDFACTOR_SRC_ALPHA:
  98       return bld->src;
  99    case PIPE_BLENDFACTOR_DST_COLOR:
 100    case PIPE_BLENDFACTOR_DST_ALPHA:
 101       return bld->dst;
 102    case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
 103       if(alpha)
 104          return bld->base.one;
 105       else {
 106          if(!bld->inv_dst)
 107             bld->inv_dst = lp_build_comp(&bld->base, bld->dst);
 108          if(!bld->saturate)
 109             bld->saturate = lp_build_min(&bld->base, bld->src, bld->inv_dst);
 110          return bld->saturate;
 111       }
 112    case PIPE_BLENDFACTOR_CONST_COLOR:
 113    case PIPE_BLENDFACTOR_CONST_ALPHA:
 114       return bld->const_;
 115    case PIPE_BLENDFACTOR_SRC1_COLOR:
 116    case PIPE_BLENDFACTOR_SRC1_ALPHA:
 117       /* TODO */
 118       assert(0);
 119       return bld->base.zero;
 120    case PIPE_BLENDFACTOR_INV_SRC_COLOR:
 121    case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
 122       if(!bld->inv_src)
 123          bld->inv_src = lp_build_comp(&bld->base, bld->src);
 124       return bld->inv_src;
 125    case PIPE_BLENDFACTOR_INV_DST_COLOR:
 126    case PIPE_BLENDFACTOR_INV_DST_ALPHA:
 127       if(!bld->inv_dst)
 128          bld->inv_dst = lp_build_comp(&bld->base, bld->dst);
 129       return bld->inv_dst;
 130    case PIPE_BLENDFACTOR_INV_CONST_COLOR:
 131    case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
 132       if(!bld->inv_const)
 133          bld->inv_const = lp_build_comp(&bld->base, bld->const_);
 134       return bld->inv_const;
 135    case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
 136    case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
 137       /* TODO */
 138       assert(0);
 139       return bld->base.zero;
 140    default:
 141       assert(0);
 142       return bld->base.zero;
 143    }
 144 }
 145
 146
 147 enum lp_build_blend_swizzle {
 148    LP_BUILD_BLEND_SWIZZLE_RGBA = 0,
 149    LP_BUILD_BLEND_SWIZZLE_AAAA = 1
 150 };
 151
 152
 153 /**
 154  * How should we shuffle the base factor.
 155  */
 156 static enum lp_build_blend_swizzle
 157 lp_build_blend_factor_swizzle(unsigned factor)
 158 {
 159    switch (factor) {
 160    case PIPE_BLENDFACTOR_ONE:
 161    case PIPE_BLENDFACTOR_ZERO:
 162    case PIPE_BLENDFACTOR_SRC_COLOR:
 163    case PIPE_BLENDFACTOR_DST_COLOR:
 164    case PIPE_BLENDFACTOR_CONST_COLOR:
 165    case PIPE_BLENDFACTOR_SRC1_COLOR:
 166    case PIPE_BLENDFACTOR_INV_SRC_COLOR:
 167    case PIPE_BLENDFACTOR_INV_DST_COLOR:
 168    case PIPE_BLENDFACTOR_INV_CONST_COLOR:
 169    case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
 170       return LP_BUILD_BLEND_SWIZZLE_RGBA;
 171    case PIPE_BLENDFACTOR_SRC_ALPHA:
 172    case PIPE_BLENDFACTOR_DST_ALPHA:
 173    case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
 174    case PIPE_BLENDFACTOR_SRC1_ALPHA:
 175    case PIPE_BLENDFACTOR_CONST_ALPHA:
 176    case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
 177    case PIPE_BLENDFACTOR_INV_DST_ALPHA:
 178    case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
 179    case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
 180       return LP_BUILD_BLEND_SWIZZLE_AAAA;
 181    default:
 182       assert(0);
 183       return LP_BUILD_BLEND_SWIZZLE_RGBA;
 184    }
 185 }
 186
 187
 188 static LLVMValueRef
 189 lp_build_blend_swizzle(struct lp_build_blend_aos_context *bld,
 190                        LLVMValueRef rgb,
 191                        LLVMValueRef alpha,
 192                        enum lp_build_blend_swizzle rgb_swizzle,
 193                        unsigned alpha_swizzle)
 194 {
 195    LLVMValueRef swizzled_rgb;
 196
 197    switch (rgb_swizzle) {
 198    case LP_BUILD_BLEND_SWIZZLE_RGBA:
 199       swizzled_rgb = rgb;
 200       break;
 201    case LP_BUILD_BLEND_SWIZZLE_AAAA:
 202       swizzled_rgb = lp_build_swizzle_scalar_aos(&bld->base, rgb, alpha_swizzle);
 203       break;
 204    default:
 205       assert(0);
 206       swizzled_rgb = bld->base.undef;
 207    }
 208
 209    if (rgb != alpha) {
 210       swizzled_rgb = lp_build_select_aos(&bld->base, 1 << alpha_swizzle,
 211                                          alpha, swizzled_rgb);
 212    }
 213
 214    return swizzled_rgb;
 215 }
 216
 217
 218 /**
 219  * @sa http://www.opengl.org/sdk/docs/man/xhtml/glBlendFuncSeparate.xml
 220  */
 221 static LLVMValueRef
 222 lp_build_blend_factor(struct lp_build_blend_aos_context *bld,
 223                       unsigned rgb_factor,
 224                       unsigned alpha_factor,
 225                       unsigned alpha_swizzle)
 226 {
 227    LLVMValueRef rgb_factor_, alpha_factor_;
 228    enum lp_build_blend_swizzle rgb_swizzle;
 229
 230    rgb_factor_ = lp_build_blend_factor_unswizzled(bld, rgb_factor, FALSE);
 231
 232    if (alpha_swizzle != UTIL_FORMAT_SWIZZLE_NONE) {
 233       rgb_swizzle   = lp_build_blend_factor_swizzle(rgb_factor);
 234       alpha_factor_ = lp_build_blend_factor_unswizzled(bld, alpha_factor, TRUE);
 235       return lp_build_blend_swizzle(bld, rgb_factor_, alpha_factor_, rgb_swizzle, alpha_swizzle);
 236    } else {
 237       return rgb_factor_;
 238    }
 239 }
 240
 241
 242 /**
 243  * Performs blending of src and dst pixels
 244  *
 245  * @param blend         the blend state of the shader variant
 246  * @param cbuf_format   format of the colour buffer
 247  * @param type          data type of the pixel vector
 248  * @param rt            rt number
 249  * @param src           blend src
 250  * @param dst           blend dst
 251  * @param mask          optional mask to apply to the blending result
 252  * @param const_        const blend color
 253  * @param swizzle       swizzle values for RGBA
 254  *
 255  * @return the result of blending src and dst
 256  */
 257 LLVMValueRef
 258 lp_build_blend_aos(struct gallivm_state *gallivm,
 259                    const struct pipe_blend_state *blend,
 260                    const enum pipe_format *cbuf_format,
 261                    struct lp_type type,
 262                    unsigned rt,
 263                    LLVMValueRef src,
 264                    LLVMValueRef dst,
 265                    LLVMValueRef mask,
 266                    LLVMValueRef const_,
 267                    const unsigned char swizzle[4])
 268 {
 269    const struct pipe_rt_blend_state * state = &blend->rt[rt];
 270    struct lp_build_blend_aos_context bld;
 271    LLVMValueRef src_factor, dst_factor;
 272    LLVMValueRef result;
 273    unsigned alpha_swizzle = swizzle[3];
 274    boolean fullcolormask;
 275
 276    /* Setup build context */
 277    memset(&bld, 0, sizeof bld);
 278    lp_build_context_init(&bld.base, gallivm, type);
 279    bld.src = src;
 280    bld.dst = dst;
 281    bld.const_ = const_;
 282
 283    if (swizzle[3] > UTIL_FORMAT_SWIZZLE_W || swizzle[3] == swizzle[0])
 284       alpha_swizzle = UTIL_FORMAT_SWIZZLE_NONE;
 285
 286    if (!state->blend_enable) {
 287       result = src;
 288    } else {
 289       boolean rgb_alpha_same = state->rgb_src_factor == state->rgb_dst_factor && state->alpha_src_factor == state->alpha_dst_factor;
 290       assert(rgb_alpha_same || alpha_swizzle != UTIL_FORMAT_SWIZZLE_NONE);
 291
 292       src_factor = lp_build_blend_factor(&bld, state->rgb_src_factor,
 293                                          state->alpha_src_factor, alpha_swizzle);
 294       dst_factor = lp_build_blend_factor(&bld, state->rgb_dst_factor,
 295                                          state->alpha_dst_factor, alpha_swizzle);
 296
 297       result = lp_build_blend(&bld.base,
 298                               state->rgb_func,
 299                               state->rgb_src_factor,
 300                               state->rgb_dst_factor,
 301                               src,
 302                               dst,
 303                               src_factor,
 304                               dst_factor,
 305                               rgb_alpha_same,
 306                               false);
 307
 308       if(state->rgb_func != state->alpha_func && alpha_swizzle != UTIL_FORMAT_SWIZZLE_NONE) {
 309          LLVMValueRef alpha;
 310
 311          alpha = lp_build_blend(&bld.base,
 312                                 state->alpha_func,
 313                                 state->alpha_src_factor,
 314                                 state->alpha_dst_factor,
 315                                 src,
 316                                 dst,
 317                                 src_factor,
 318                                 dst_factor,
 319                                 rgb_alpha_same,
 320                                 false);
 321
 322          result = lp_build_blend_swizzle(&bld,
 323                                          result,
 324                                          alpha,
 325                                          LP_BUILD_BLEND_SWIZZLE_RGBA,
 326                                          alpha_swizzle);
 327       }
 328    }
 329
 330    /* Check if color mask is necessary */
 331    fullcolormask = util_format_colormask_full(util_format_description(cbuf_format[rt]), state->colormask);
 332
 333    if (!fullcolormask) {
 334       LLVMValueRef color_mask;
 335
 336       color_mask = lp_build_const_mask_aos_swizzled(gallivm, bld.base.type, state->colormask, swizzle);
 337       lp_build_name(color_mask, "color_mask");
 338
 339       /* Combine with input mask if necessary */
 340       if (mask) {
 341          mask = lp_build_and(&bld.base, color_mask, mask);
 342       } else {
 343          mask = color_mask;
 344       }
 345    }
 346
 347    /* Apply mask, if one exists */
 348    if (mask) {
 349       result = lp_build_select(&bld.base, mask, result, dst);
 350    }
 351
 352    return result;
 353 }