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      1 /**************************************************************************
      2  *
      3  * Copyright 2007 VMware, Inc.
      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 VMWARE 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 <keithw (at) vmware.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 "framebuffer.h"
     43 #include "main/macros.h"
     44 
     45 /**
     46  * Convert GLenum blend tokens to pipe tokens.
     47  * Both blend factors and blend funcs are accepted.
     48  */
     49 static GLuint
     50 translate_blend(GLenum blend)
     51 {
     52    switch (blend) {
     53    /* blend functions */
     54    case GL_FUNC_ADD:
     55       return PIPE_BLEND_ADD;
     56    case GL_FUNC_SUBTRACT:
     57       return PIPE_BLEND_SUBTRACT;
     58    case GL_FUNC_REVERSE_SUBTRACT:
     59       return PIPE_BLEND_REVERSE_SUBTRACT;
     60    case GL_MIN:
     61       return PIPE_BLEND_MIN;
     62    case GL_MAX:
     63       return PIPE_BLEND_MAX;
     64 
     65    /* blend factors */
     66    case GL_ONE:
     67       return PIPE_BLENDFACTOR_ONE;
     68    case GL_SRC_COLOR:
     69       return PIPE_BLENDFACTOR_SRC_COLOR;
     70    case GL_SRC_ALPHA:
     71       return PIPE_BLENDFACTOR_SRC_ALPHA;
     72    case GL_DST_ALPHA:
     73       return PIPE_BLENDFACTOR_DST_ALPHA;
     74    case GL_DST_COLOR:
     75       return PIPE_BLENDFACTOR_DST_COLOR;
     76    case GL_SRC_ALPHA_SATURATE:
     77       return PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE;
     78    case GL_CONSTANT_COLOR:
     79       return PIPE_BLENDFACTOR_CONST_COLOR;
     80    case GL_CONSTANT_ALPHA:
     81       return PIPE_BLENDFACTOR_CONST_ALPHA;
     82    case GL_SRC1_COLOR:
     83       return PIPE_BLENDFACTOR_SRC1_COLOR;
     84    case GL_SRC1_ALPHA:
     85       return PIPE_BLENDFACTOR_SRC1_ALPHA;
     86    case GL_ZERO:
     87       return PIPE_BLENDFACTOR_ZERO;
     88    case GL_ONE_MINUS_SRC_COLOR:
     89       return PIPE_BLENDFACTOR_INV_SRC_COLOR;
     90    case GL_ONE_MINUS_SRC_ALPHA:
     91       return PIPE_BLENDFACTOR_INV_SRC_ALPHA;
     92    case GL_ONE_MINUS_DST_COLOR:
     93       return PIPE_BLENDFACTOR_INV_DST_COLOR;
     94    case GL_ONE_MINUS_DST_ALPHA:
     95       return PIPE_BLENDFACTOR_INV_DST_ALPHA;
     96    case GL_ONE_MINUS_CONSTANT_COLOR:
     97       return PIPE_BLENDFACTOR_INV_CONST_COLOR;
     98    case GL_ONE_MINUS_CONSTANT_ALPHA:
     99       return PIPE_BLENDFACTOR_INV_CONST_ALPHA;
    100    case GL_ONE_MINUS_SRC1_COLOR:
    101       return PIPE_BLENDFACTOR_INV_SRC1_COLOR;
    102    case GL_ONE_MINUS_SRC1_ALPHA:
    103       return PIPE_BLENDFACTOR_INV_SRC1_ALPHA;
    104    default:
    105       assert("invalid GL token in translate_blend()" == NULL);
    106       return 0;
    107    }
    108 }
    109 
    110 
    111 /**
    112  * Convert GLenum logicop tokens to pipe tokens.
    113  */
    114 static GLuint
    115 translate_logicop(GLenum logicop)
    116 {
    117    switch (logicop) {
    118    case GL_CLEAR:
    119       return PIPE_LOGICOP_CLEAR;
    120    case GL_NOR:
    121       return PIPE_LOGICOP_NOR;
    122    case GL_AND_INVERTED:
    123       return PIPE_LOGICOP_AND_INVERTED;
    124    case GL_COPY_INVERTED:
    125       return PIPE_LOGICOP_COPY_INVERTED;
    126    case GL_AND_REVERSE:
    127       return PIPE_LOGICOP_AND_REVERSE;
    128    case GL_INVERT:
    129       return PIPE_LOGICOP_INVERT;
    130    case GL_XOR:
    131       return PIPE_LOGICOP_XOR;
    132    case GL_NAND:
    133       return PIPE_LOGICOP_NAND;
    134    case GL_AND:
    135       return PIPE_LOGICOP_AND;
    136    case GL_EQUIV:
    137       return PIPE_LOGICOP_EQUIV;
    138    case GL_NOOP:
    139       return PIPE_LOGICOP_NOOP;
    140    case GL_OR_INVERTED:
    141       return PIPE_LOGICOP_OR_INVERTED;
    142    case GL_COPY:
    143       return PIPE_LOGICOP_COPY;
    144    case GL_OR_REVERSE:
    145       return PIPE_LOGICOP_OR_REVERSE;
    146    case GL_OR:
    147       return PIPE_LOGICOP_OR;
    148    case GL_SET:
    149       return PIPE_LOGICOP_SET;
    150    default:
    151       assert("invalid GL token in translate_logicop()" == NULL);
    152       return 0;
    153    }
    154 }
    155 
    156 /**
    157  * Figure out if colormasks are different per rt.
    158  */
    159 static GLboolean
    160 colormask_per_rt(const struct gl_context *ctx)
    161 {
    162    /* a bit suboptimal have to compare lots of values */
    163    unsigned i;
    164    for (i = 1; i < ctx->Const.MaxDrawBuffers; i++) {
    165       if (memcmp(ctx->Color.ColorMask[0], ctx->Color.ColorMask[i], 4)) {
    166          return GL_TRUE;
    167       }
    168    }
    169    return GL_FALSE;
    170 }
    171 
    172 /**
    173  * Figure out if blend enables/state are different per rt.
    174  */
    175 static GLboolean
    176 blend_per_rt(const struct gl_context *ctx)
    177 {
    178    if (ctx->Color.BlendEnabled &&
    179       (ctx->Color.BlendEnabled != ((1U << ctx->Const.MaxDrawBuffers) - 1))) {
    180       /* This can only happen if GL_EXT_draw_buffers2 is enabled */
    181       return GL_TRUE;
    182    }
    183    if (ctx->Color._BlendFuncPerBuffer || ctx->Color._BlendEquationPerBuffer) {
    184       /* this can only happen if GL_ARB_draw_buffers_blend is enabled */
    185       return GL_TRUE;
    186    }
    187    return GL_FALSE;
    188 }
    189 
    190 void
    191 st_update_blend( struct st_context *st )
    192 {
    193    struct pipe_blend_state *blend = &st->state.blend;
    194    const struct gl_context *ctx = st->ctx;
    195    unsigned num_state = 1;
    196    unsigned i, j;
    197 
    198    memset(blend, 0, sizeof(*blend));
    199 
    200    if (blend_per_rt(ctx) || colormask_per_rt(ctx)) {
    201       num_state = ctx->Const.MaxDrawBuffers;
    202       blend->independent_blend_enable = 1;
    203    }
    204    if (ctx->Color.ColorLogicOpEnabled) {
    205       /* logicop enabled */
    206       blend->logicop_enable = 1;
    207       blend->logicop_func = translate_logicop(ctx->Color.LogicOp);
    208    }
    209    else if (ctx->Color.BlendEnabled && !ctx->Color._AdvancedBlendMode) {
    210       /* blending enabled */
    211       for (i = 0, j = 0; i < num_state; i++) {
    212 
    213          blend->rt[i].blend_enable = (ctx->Color.BlendEnabled >> i) & 0x1;
    214 
    215          if (ctx->Extensions.ARB_draw_buffers_blend)
    216             j = i;
    217 
    218          blend->rt[i].rgb_func =
    219             translate_blend(ctx->Color.Blend[j].EquationRGB);
    220 
    221          if (ctx->Color.Blend[i].EquationRGB == GL_MIN ||
    222              ctx->Color.Blend[i].EquationRGB == GL_MAX) {
    223             /* Min/max are special */
    224             blend->rt[i].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
    225             blend->rt[i].rgb_dst_factor = PIPE_BLENDFACTOR_ONE;
    226          }
    227          else {
    228             blend->rt[i].rgb_src_factor =
    229                translate_blend(ctx->Color.Blend[j].SrcRGB);
    230             blend->rt[i].rgb_dst_factor =
    231                translate_blend(ctx->Color.Blend[j].DstRGB);
    232          }
    233 
    234          blend->rt[i].alpha_func =
    235             translate_blend(ctx->Color.Blend[j].EquationA);
    236 
    237          if (ctx->Color.Blend[i].EquationA == GL_MIN ||
    238              ctx->Color.Blend[i].EquationA == GL_MAX) {
    239             /* Min/max are special */
    240             blend->rt[i].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
    241             blend->rt[i].alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
    242          }
    243          else {
    244             blend->rt[i].alpha_src_factor =
    245                translate_blend(ctx->Color.Blend[j].SrcA);
    246             blend->rt[i].alpha_dst_factor =
    247                translate_blend(ctx->Color.Blend[j].DstA);
    248          }
    249       }
    250    }
    251    else {
    252       /* no blending / logicop */
    253    }
    254 
    255    /* Colormask - maybe reverse these bits? */
    256    for (i = 0; i < num_state; i++) {
    257       if (ctx->Color.ColorMask[i][0])
    258          blend->rt[i].colormask |= PIPE_MASK_R;
    259       if (ctx->Color.ColorMask[i][1])
    260          blend->rt[i].colormask |= PIPE_MASK_G;
    261       if (ctx->Color.ColorMask[i][2])
    262          blend->rt[i].colormask |= PIPE_MASK_B;
    263       if (ctx->Color.ColorMask[i][3])
    264          blend->rt[i].colormask |= PIPE_MASK_A;
    265    }
    266 
    267    blend->dither = ctx->Color.DitherFlag;
    268 
    269    if (_mesa_is_multisample_enabled(ctx) &&
    270        !(ctx->DrawBuffer->_IntegerBuffers & 0x1)) {
    271       /* Unlike in gallium/d3d10 these operations are only performed
    272        * if both msaa is enabled and we have a multisample buffer.
    273        */
    274       blend->alpha_to_coverage = ctx->Multisample.SampleAlphaToCoverage;
    275       blend->alpha_to_one = ctx->Multisample.SampleAlphaToOne;
    276    }
    277 
    278    cso_set_blend(st->cso_context, blend);
    279 }
    280 
    281 void
    282 st_update_blend_color(struct st_context *st)
    283 {
    284    struct pipe_blend_color bc;
    285 
    286    COPY_4FV(bc.color, st->ctx->Color.BlendColorUnclamped);
    287    cso_set_blend_color(st->cso_context, &bc);
    288 }
    289