src/mesa/state_tracker/st_atom_blend.c

   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       /*
  82       return PIPE_BLENDFACTOR_SRC1_COLOR;
  83       return PIPE_BLENDFACTOR_SRC1_ALPHA;
  84       */
  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       /*
 100       return PIPE_BLENDFACTOR_INV_SRC1_COLOR;
 101       return PIPE_BLENDFACTOR_INV_SRC1_ALPHA;
 102       */
 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    /* Note it is impossible to correctly deal with EXT_blend_logic_op and
 204       EXT_draw_buffers2/EXT_blend_equation_separate at the same time.
 205       These combinations would require support for per-rt logicop enables
 206       and separate alpha/rgb logicop/blend support respectively. Neither
 207       possible in gallium nor most hardware. Assume these combinations
 208       don't happen. */
 209    if (ctx->Color.ColorLogicOpEnabled ||
 210        (ctx->Color.BlendEnabled &&
 211         ctx->Color.Blend[0].EquationRGB == GL_LOGIC_OP)) {
 212       /* logicop enabled */
 213       blend->logicop_enable = 1;
 214       blend->logicop_func = translate_logicop(ctx->Color.LogicOp);
 215    }
 216    else if (ctx->Color.BlendEnabled) {
 217       /* blending enabled */
 218       for (i = 0, j = 0; i < num_state; i++) {
 219
 220          blend->rt[i].blend_enable = (ctx->Color.BlendEnabled >> i) & 0x1;
 221
 222          if (ctx->Extensions.ARB_draw_buffers_blend)
 223             j = i;
 224
 225          blend->rt[i].rgb_func =
 226             translate_blend(ctx->Color.Blend[j].EquationRGB);
 227
 228          if (ctx->Color.Blend[i].EquationRGB == GL_MIN ||
 229              ctx->Color.Blend[i].EquationRGB == GL_MAX) {
 230             /* Min/max are special */
 231             blend->rt[i].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 232             blend->rt[i].rgb_dst_factor = PIPE_BLENDFACTOR_ONE;
 233          }
 234          else {
 235             blend->rt[i].rgb_src_factor =
 236                translate_blend(ctx->Color.Blend[j].SrcRGB);
 237             blend->rt[i].rgb_dst_factor =
 238                translate_blend(ctx->Color.Blend[j].DstRGB);
 239          }
 240
 241          blend->rt[i].alpha_func =
 242             translate_blend(ctx->Color.Blend[j].EquationA);
 243
 244          if (ctx->Color.Blend[i].EquationA == GL_MIN ||
 245              ctx->Color.Blend[i].EquationA == GL_MAX) {
 246             /* Min/max are special */
 247             blend->rt[i].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 248             blend->rt[i].alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
 249          }
 250          else {
 251             blend->rt[i].alpha_src_factor =
 252                translate_blend(ctx->Color.Blend[j].SrcA);
 253             blend->rt[i].alpha_dst_factor =
 254                translate_blend(ctx->Color.Blend[j].DstA);
 255          }
 256       }
 257    }
 258    else {
 259       /* no blending / logicop */
 260    }
 261
 262    /* Colormask - maybe reverse these bits? */
 263    for (i = 0; i < num_state; i++) {
 264       if (ctx->Color.ColorMask[i][0])
 265          blend->rt[i].colormask |= PIPE_MASK_R;
 266       if (ctx->Color.ColorMask[i][1])
 267          blend->rt[i].colormask |= PIPE_MASK_G;
 268       if (ctx->Color.ColorMask[i][2])
 269          blend->rt[i].colormask |= PIPE_MASK_B;
 270       if (ctx->Color.ColorMask[i][3])
 271          blend->rt[i].colormask |= PIPE_MASK_A;
 272    }
 273
 274    if (ctx->Color.DitherFlag)
 275       blend->dither = 1;
 276
 277    if (ctx->Multisample.Enabled) {
 278       /* unlike in gallium/d3d10 these operations are only performed
 279          if msaa is enabled */
 280       if (ctx->Multisample.SampleAlphaToCoverage)
 281          blend->alpha_to_coverage = 1;
 282       if (ctx->Multisample.SampleAlphaToOne)
 283          blend->alpha_to_one = 1;
 284    }
 285
 286    cso_set_blend(st->cso_context, blend);
 287
 288    {
 289       struct pipe_blend_color bc;
 290       COPY_4FV(bc.color, ctx->Color.BlendColorUnclamped);
 291       cso_set_blend_color(st->cso_context, &bc);
 292    }
 293 }
 294
 295
 296 const struct st_tracked_state st_update_blend = {
 297    "st_update_blend",                                   /* name */
 298    {                                                    /* dirty */
 299       (_NEW_COLOR | _NEW_MULTISAMPLE),  /* XXX _NEW_BLEND someday? */   /* mesa */
 300       0,                                                /* st */
 301    },
 302    update_blend,                                        /* update */
 303 };