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 /**
 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       struct pipe_blend_color bc;
 282       COPY_4FV(bc.color, ctx->Color.BlendColorUnclamped);
 283       cso_set_blend_color(st->cso_context, &bc);
 284    }
 285 }