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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@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.