src/mesa/state_tracker/st_atom_blend.c

   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@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  * Figure out if colormasks are different per rt.
 112  */
 113 static GLboolean
 114 colormask_per_rt(const struct gl_context *ctx)
 115 {
 116    /* a bit suboptimal have to compare lots of values */
 117    unsigned i;
 118    for (i = 1; i < ctx->Const.MaxDrawBuffers; i++) {
 119       if (memcmp(ctx->Color.ColorMask[0], ctx->Color.ColorMask[i], 4)) {
 120          return GL_TRUE;
 121       }
 122    }
 123    return GL_FALSE;
 124 }
 125
 126 /**
 127  * Figure out if blend enables/state are different per rt.
 128  */
 129 static GLboolean
 130 blend_per_rt(const struct gl_context *ctx)
 131 {
 132    if (ctx->Color.BlendEnabled &&
 133       (ctx->Color.BlendEnabled != ((1U << ctx->Const.MaxDrawBuffers) - 1))) {
 134       /* This can only happen if GL_EXT_draw_buffers2 is enabled */
 135       return GL_TRUE;
 136    }
 137    if (ctx->Color._BlendFuncPerBuffer || ctx->Color._BlendEquationPerBuffer) {
 138       /* this can only happen if GL_ARB_draw_buffers_blend is enabled */
 139       return GL_TRUE;
 140    }
 141    return GL_FALSE;
 142 }
 143
 144 void
 145 st_update_blend( struct st_context *st )
 146 {
 147    struct pipe_blend_state *blend = &st->state.blend;
 148    const struct gl_context *ctx = st->ctx;
 149    unsigned num_state = 1;
 150    unsigned i, j;
 151
 152    memset(blend, 0, sizeof(*blend));
 153
 154    if (blend_per_rt(ctx) || colormask_per_rt(ctx)) {
 155       num_state = ctx->Const.MaxDrawBuffers;
 156       blend->independent_blend_enable = 1;
 157    }
 158    if (ctx->Color.ColorLogicOpEnabled) {
 159       /* logicop enabled */
 160       blend->logicop_enable = 1;
 161       blend->logicop_func = ctx->Color._LogicOp;
 162    }
 163    else if (ctx->Color.BlendEnabled && !ctx->Color._AdvancedBlendMode) {
 164       /* blending enabled */
 165       for (i = 0, j = 0; i < num_state; i++) {
 166
 167          blend->rt[i].blend_enable = (ctx->Color.BlendEnabled >> i) & 0x1;
 168
 169          if (ctx->Extensions.ARB_draw_buffers_blend)
 170             j = i;
 171
 172          blend->rt[i].rgb_func =
 173             translate_blend(ctx->Color.Blend[j].EquationRGB);
 174
 175          if (ctx->Color.Blend[i].EquationRGB == GL_MIN ||
 176              ctx->Color.Blend[i].EquationRGB == GL_MAX) {
 177             /* Min/max are special */
 178             blend->rt[i].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 179             blend->rt[i].rgb_dst_factor = PIPE_BLENDFACTOR_ONE;
 180          }
 181          else {
 182             blend->rt[i].rgb_src_factor =
 183                translate_blend(ctx->Color.Blend[j].SrcRGB);
 184             blend->rt[i].rgb_dst_factor =
 185                translate_blend(ctx->Color.Blend[j].DstRGB);
 186          }
 187
 188          blend->rt[i].alpha_func =
 189             translate_blend(ctx->Color.Blend[j].EquationA);
 190
 191          if (ctx->Color.Blend[i].EquationA == GL_MIN ||
 192              ctx->Color.Blend[i].EquationA == GL_MAX) {
 193             /* Min/max are special */
 194             blend->rt[i].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 195             blend->rt[i].alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
 196          }
 197          else {
 198             blend->rt[i].alpha_src_factor =
 199                translate_blend(ctx->Color.Blend[j].SrcA);
 200             blend->rt[i].alpha_dst_factor =
 201                translate_blend(ctx->Color.Blend[j].DstA);
 202          }
 203       }
 204    }
 205    else {
 206       /* no blending / logicop */
 207    }
 208
 209    /* Colormask - maybe reverse these bits? */
 210    for (i = 0; i < num_state; i++) {
 211       if (ctx->Color.ColorMask[i][0])
 212          blend->rt[i].colormask |= PIPE_MASK_R;
 213       if (ctx->Color.ColorMask[i][1])
 214          blend->rt[i].colormask |= PIPE_MASK_G;
 215       if (ctx->Color.ColorMask[i][2])
 216          blend->rt[i].colormask |= PIPE_MASK_B;
 217       if (ctx->Color.ColorMask[i][3])
 218          blend->rt[i].colormask |= PIPE_MASK_A;
 219    }
 220
 221    blend->dither = ctx->Color.DitherFlag;
 222
 223    if (_mesa_is_multisample_enabled(ctx) &&
 224        !(ctx->DrawBuffer->_IntegerBuffers & 0x1)) {
 225       /* Unlike in gallium/d3d10 these operations are only performed
 226        * if both msaa is enabled and we have a multisample buffer.
 227        */
 228       blend->alpha_to_coverage = ctx->Multisample.SampleAlphaToCoverage;
 229       blend->alpha_to_one = ctx->Multisample.SampleAlphaToOne;
 230    }
 231
 232    cso_set_blend(st->cso_context, blend);
 233 }
 234
 235 void
 236 st_update_blend_color(struct st_context *st)
 237 {
 238    struct pipe_blend_color bc;
 239
 240    COPY_4FV(bc.color, st->ctx->Color.BlendColorUnclamped);
 241    cso_set_blend_color(st->cso_context, &bc);
 242 }