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      1 /**************************************************************************
      2  *
      3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial portions
     16  * of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
     22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     27 
     28  /*
     29   * Authors:
     30   *   Keith Whitwell <keith (at) tungstengraphics.com>
     31   *   Brian Paul
     32   */
     33 
     34 
     35 #include "st_context.h"
     36 #include "st_atom.h"
     37 
     38 #include "pipe/p_context.h"
     39 #include "pipe/p_defines.h"
     40 #include "cso_cache/cso_context.h"
     41 
     42 #include "main/macros.h"
     43 
     44 /**
     45  * Convert GLenum blend tokens to pipe tokens.
     46  * Both blend factors and blend funcs are accepted.
     47  */
     48 static GLuint
     49 translate_blend(GLenum blend)
     50 {
     51    switch (blend) {
     52    /* blend functions */
     53    case GL_FUNC_ADD:
     54       return PIPE_BLEND_ADD;
     55    case GL_FUNC_SUBTRACT:
     56       return PIPE_BLEND_SUBTRACT;
     57    case GL_FUNC_REVERSE_SUBTRACT:
     58       return PIPE_BLEND_REVERSE_SUBTRACT;
     59    case GL_MIN:
     60       return PIPE_BLEND_MIN;
     61    case GL_MAX:
     62       return PIPE_BLEND_MAX;
     63 
     64    /* blend factors */
     65    case GL_ONE:
     66       return PIPE_BLENDFACTOR_ONE;
     67    case GL_SRC_COLOR:
     68       return PIPE_BLENDFACTOR_SRC_COLOR;
     69    case GL_SRC_ALPHA:
     70       return PIPE_BLENDFACTOR_SRC_ALPHA;
     71    case GL_DST_ALPHA:
     72       return PIPE_BLENDFACTOR_DST_ALPHA;
     73    case GL_DST_COLOR:
     74       return PIPE_BLENDFACTOR_DST_COLOR;
     75    case GL_SRC_ALPHA_SATURATE:
     76       return PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE;
     77    case GL_CONSTANT_COLOR:
     78       return PIPE_BLENDFACTOR_CONST_COLOR;
     79    case GL_CONSTANT_ALPHA:
     80       return PIPE_BLENDFACTOR_CONST_ALPHA;
     81    case GL_SRC1_COLOR:
     82       return PIPE_BLENDFACTOR_SRC1_COLOR;
     83    case GL_SRC1_ALPHA:
     84       return PIPE_BLENDFACTOR_SRC1_ALPHA;
     85    case GL_ZERO:
     86       return PIPE_BLENDFACTOR_ZERO;
     87    case GL_ONE_MINUS_SRC_COLOR:
     88       return PIPE_BLENDFACTOR_INV_SRC_COLOR;
     89    case GL_ONE_MINUS_SRC_ALPHA:
     90       return PIPE_BLENDFACTOR_INV_SRC_ALPHA;
     91    case GL_ONE_MINUS_DST_COLOR:
     92       return PIPE_BLENDFACTOR_INV_DST_COLOR;
     93    case GL_ONE_MINUS_DST_ALPHA:
     94       return PIPE_BLENDFACTOR_INV_DST_ALPHA;
     95    case GL_ONE_MINUS_CONSTANT_COLOR:
     96       return PIPE_BLENDFACTOR_INV_CONST_COLOR;
     97    case GL_ONE_MINUS_CONSTANT_ALPHA:
     98       return PIPE_BLENDFACTOR_INV_CONST_ALPHA;
     99    case GL_ONE_MINUS_SRC1_COLOR:
    100       return PIPE_BLENDFACTOR_INV_SRC1_COLOR;
    101    case GL_ONE_MINUS_SRC1_ALPHA:
    102       return PIPE_BLENDFACTOR_INV_SRC1_ALPHA;
    103    default:
    104       assert("invalid GL token in translate_blend()" == NULL);
    105       return 0;
    106    }
    107 }
    108 
    109 
    110 /**
    111  * Convert GLenum logicop tokens to pipe tokens.
    112  */
    113 static GLuint
    114 translate_logicop(GLenum logicop)
    115 {
    116    switch (logicop) {
    117    case GL_CLEAR:
    118       return PIPE_LOGICOP_CLEAR;
    119    case GL_NOR:
    120       return PIPE_LOGICOP_NOR;
    121    case GL_AND_INVERTED:
    122       return PIPE_LOGICOP_AND_INVERTED;
    123    case GL_COPY_INVERTED:
    124       return PIPE_LOGICOP_COPY_INVERTED;
    125    case GL_AND_REVERSE:
    126       return PIPE_LOGICOP_AND_REVERSE;
    127    case GL_INVERT:
    128       return PIPE_LOGICOP_INVERT;
    129    case GL_XOR:
    130       return PIPE_LOGICOP_XOR;
    131    case GL_NAND:
    132       return PIPE_LOGICOP_NAND;
    133    case GL_AND:
    134       return PIPE_LOGICOP_AND;
    135    case GL_EQUIV:
    136       return PIPE_LOGICOP_EQUIV;
    137    case GL_NOOP:
    138       return PIPE_LOGICOP_NOOP;
    139    case GL_OR_INVERTED:
    140       return PIPE_LOGICOP_OR_INVERTED;
    141    case GL_COPY:
    142       return PIPE_LOGICOP_COPY;
    143    case GL_OR_REVERSE:
    144       return PIPE_LOGICOP_OR_REVERSE;
    145    case GL_OR:
    146       return PIPE_LOGICOP_OR;
    147    case GL_SET:
    148       return PIPE_LOGICOP_SET;
    149    default:
    150       assert("invalid GL token in translate_logicop()" == NULL);
    151       return 0;
    152    }
    153 }
    154 
    155 /**
    156  * Figure out if colormasks are different per rt.
    157  */
    158 static GLboolean
    159 colormask_per_rt(const struct gl_context *ctx)
    160 {
    161    /* a bit suboptimal have to compare lots of values */
    162    unsigned i;
    163    for (i = 1; i < ctx->Const.MaxDrawBuffers; i++) {
    164       if (memcmp(ctx->Color.ColorMask[0], ctx->Color.ColorMask[i], 4)) {
    165          return GL_TRUE;
    166       }
    167    }
    168    return GL_FALSE;
    169 }
    170 
    171 /**
    172  * Figure out if blend enables/state are different per rt.
    173  */
    174 static GLboolean
    175 blend_per_rt(const struct gl_context *ctx)
    176 {
    177    if (ctx->Color.BlendEnabled &&
    178       (ctx->Color.BlendEnabled != ((1 << ctx->Const.MaxDrawBuffers) - 1))) {
    179       /* This can only happen if GL_EXT_draw_buffers2 is enabled */
    180       return GL_TRUE;
    181    }
    182    if (ctx->Color._BlendFuncPerBuffer || ctx->Color._BlendEquationPerBuffer) {
    183       /* this can only happen if GL_ARB_draw_buffers_blend is enabled */
    184       return GL_TRUE;
    185    }
    186    return GL_FALSE;
    187 }
    188 
    189 static void
    190 update_blend( struct st_context *st )
    191 {
    192    struct pipe_blend_state *blend = &st->state.blend;
    193    const struct gl_context *ctx = st->ctx;
    194    unsigned num_state = 1;
    195    unsigned i, j;
    196 
    197    memset(blend, 0, sizeof(*blend));
    198 
    199    if (blend_per_rt(ctx) || colormask_per_rt(ctx)) {
    200       num_state = ctx->Const.MaxDrawBuffers;
    201       blend->independent_blend_enable = 1;
    202    }
    203    if (ctx->Color.ColorLogicOpEnabled) {
    204       /* logicop enabled */
    205       blend->logicop_enable = 1;
    206       blend->logicop_func = translate_logicop(ctx->Color.LogicOp);
    207    }
    208    else if (ctx->Color.BlendEnabled) {
    209       /* blending enabled */
    210       for (i = 0, j = 0; i < num_state; i++) {
    211 
    212          blend->rt[i].blend_enable = (ctx->Color.BlendEnabled >> i) & 0x1;
    213 
    214          if (ctx->Extensions.ARB_draw_buffers_blend)
    215             j = i;
    216 
    217          blend->rt[i].rgb_func =
    218             translate_blend(ctx->Color.Blend[j].EquationRGB);
    219 
    220          if (ctx->Color.Blend[i].EquationRGB == GL_MIN ||
    221              ctx->Color.Blend[i].EquationRGB == GL_MAX) {
    222             /* Min/max are special */
    223             blend->rt[i].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
    224             blend->rt[i].rgb_dst_factor = PIPE_BLENDFACTOR_ONE;
    225          }
    226          else {
    227             blend->rt[i].rgb_src_factor =
    228                translate_blend(ctx->Color.Blend[j].SrcRGB);
    229             blend->rt[i].rgb_dst_factor =
    230                translate_blend(ctx->Color.Blend[j].DstRGB);
    231          }
    232 
    233          blend->rt[i].alpha_func =
    234             translate_blend(ctx->Color.Blend[j].EquationA);
    235 
    236          if (ctx->Color.Blend[i].EquationA == GL_MIN ||
    237              ctx->Color.Blend[i].EquationA == GL_MAX) {
    238             /* Min/max are special */
    239             blend->rt[i].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
    240             blend->rt[i].alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
    241          }
    242          else {
    243             blend->rt[i].alpha_src_factor =
    244                translate_blend(ctx->Color.Blend[j].SrcA);
    245             blend->rt[i].alpha_dst_factor =
    246                translate_blend(ctx->Color.Blend[j].DstA);
    247          }
    248       }
    249    }
    250    else {
    251       /* no blending / logicop */
    252    }
    253 
    254    /* Colormask - maybe reverse these bits? */
    255    for (i = 0; i < num_state; i++) {
    256       if (ctx->Color.ColorMask[i][0])
    257          blend->rt[i].colormask |= PIPE_MASK_R;
    258       if (ctx->Color.ColorMask[i][1])
    259          blend->rt[i].colormask |= PIPE_MASK_G;
    260       if (ctx->Color.ColorMask[i][2])
    261          blend->rt[i].colormask |= PIPE_MASK_B;
    262       if (ctx->Color.ColorMask[i][3])
    263          blend->rt[i].colormask |= PIPE_MASK_A;
    264    }
    265 
    266    if (ctx->Color.DitherFlag)
    267       blend->dither = 1;
    268 
    269    if (ctx->Multisample.Enabled) {
    270       /* unlike in gallium/d3d10 these operations are only performed
    271          if msaa is enabled */
    272       if (ctx->Multisample.SampleAlphaToCoverage)
    273          blend->alpha_to_coverage = 1;
    274       if (ctx->Multisample.SampleAlphaToOne)
    275          blend->alpha_to_one = 1;
    276    }
    277 
    278    cso_set_blend(st->cso_context, blend);
    279 
    280    {
    281       struct pipe_blend_color bc;
    282       COPY_4FV(bc.color, ctx->Color.BlendColorUnclamped);
    283       cso_set_blend_color(st->cso_context, &bc);
    284    }
    285 }
    286 
    287 
    288 const struct st_tracked_state st_update_blend = {
    289    "st_update_blend",					/* name */
    290    {							/* dirty */
    291       (_NEW_COLOR | _NEW_MULTISAMPLE),  /* XXX _NEW_BLEND someday? */	/* mesa */
    292       0,						/* st */
    293    },
    294    update_blend,					/* update */
    295 };
    296