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_cache.h"
  37 #include "st_atom.h"
  38
  39 #include "pipe/p_context.h"
  40 #include "pipe/p_defines.h"
  41
  42
  43 /**
  44  * Convert GLenum blend tokens to pipe tokens.
  45  * Both blend factors and blend funcs are accepted.
  46  */
  47 static GLuint
  48 gl_blend_to_sp(GLenum blend)
  49 {
  50    switch (blend) {
  51    /* blend functions */
  52    case GL_FUNC_ADD:
  53       return PIPE_BLEND_ADD;
  54    case GL_FUNC_SUBTRACT:
  55       return PIPE_BLEND_SUBTRACT;
  56    case GL_FUNC_REVERSE_SUBTRACT:
  57       return PIPE_BLEND_REVERSE_SUBTRACT;
  58    case GL_MIN:
  59       return PIPE_BLEND_MIN;
  60    case GL_MAX:
  61       return PIPE_BLEND_MAX;
  62
  63    /* blend factors */
  64    case GL_ONE:
  65       return PIPE_BLENDFACTOR_ONE;
  66    case GL_SRC_COLOR:
  67       return PIPE_BLENDFACTOR_SRC_COLOR;
  68    case GL_SRC_ALPHA:
  69       return PIPE_BLENDFACTOR_SRC_ALPHA;
  70    case GL_DST_ALPHA:
  71       return PIPE_BLENDFACTOR_DST_ALPHA;
  72    case GL_DST_COLOR:
  73       return PIPE_BLENDFACTOR_DST_COLOR;
  74    case GL_SRC_ALPHA_SATURATE:
  75       return PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE;
  76    case GL_CONSTANT_COLOR:
  77       return PIPE_BLENDFACTOR_CONST_COLOR;
  78    case GL_CONSTANT_ALPHA:
  79       return PIPE_BLENDFACTOR_CONST_ALPHA;
  80       /*
  81       return PIPE_BLENDFACTOR_SRC1_COLOR;
  82       return PIPE_BLENDFACTOR_SRC1_ALPHA;
  83       */
  84    case GL_ZERO:
  85       return PIPE_BLENDFACTOR_ZERO;
  86    case GL_ONE_MINUS_SRC_COLOR:
  87       return PIPE_BLENDFACTOR_INV_SRC_COLOR;
  88    case GL_ONE_MINUS_SRC_ALPHA:
  89       return PIPE_BLENDFACTOR_INV_SRC_ALPHA;
  90    case GL_ONE_MINUS_DST_COLOR:
  91       return PIPE_BLENDFACTOR_INV_DST_ALPHA;
  92    case GL_ONE_MINUS_DST_ALPHA:
  93       return PIPE_BLENDFACTOR_INV_DST_COLOR;
  94    case GL_ONE_MINUS_CONSTANT_COLOR:
  95       return PIPE_BLENDFACTOR_INV_CONST_COLOR;
  96    case GL_ONE_MINUS_CONSTANT_ALPHA:
  97       return PIPE_BLENDFACTOR_INV_CONST_ALPHA;
  98       /*
  99       return PIPE_BLENDFACTOR_INV_SRC1_COLOR;
 100       return PIPE_BLENDFACTOR_INV_SRC1_ALPHA;
 101       */
 102    default:
 103       assert("invalid GL token in gl_blend_to_sp()" == NULL);
 104       return 0;
 105    }
 106 }
 107
 108
 109 /**
 110  * Convert GLenum logicop tokens to pipe tokens.
 111  */
 112 static GLuint
 113 gl_logicop_to_sp(GLenum logicop)
 114 {
 115    switch (logicop) {
 116    case GL_CLEAR:
 117       return PIPE_LOGICOP_CLEAR;
 118    case GL_NOR:
 119       return PIPE_LOGICOP_NOR;
 120    case GL_AND_INVERTED:
 121       return PIPE_LOGICOP_AND_INVERTED;
 122    case GL_COPY_INVERTED:
 123       return PIPE_LOGICOP_COPY_INVERTED;
 124    case GL_AND_REVERSE:
 125       return PIPE_LOGICOP_AND_REVERSE;
 126    case GL_INVERT:
 127       return PIPE_LOGICOP_INVERT;
 128    case GL_XOR:
 129       return PIPE_LOGICOP_XOR;
 130    case GL_NAND:
 131       return PIPE_LOGICOP_NAND;
 132    case GL_AND:
 133       return PIPE_LOGICOP_AND;
 134    case GL_EQUIV:
 135       return PIPE_LOGICOP_EQUIV;
 136    case GL_NOOP:
 137       return PIPE_LOGICOP_NOOP;
 138    case GL_OR_INVERTED:
 139       return PIPE_LOGICOP_OR_INVERTED;
 140    case GL_COPY:
 141       return PIPE_LOGICOP_COPY;
 142    case GL_OR_REVERSE:
 143       return PIPE_LOGICOP_OR_REVERSE;
 144    case GL_OR:
 145       return PIPE_LOGICOP_OR;
 146    case GL_SET:
 147       return PIPE_LOGICOP_SET;
 148    default:
 149       assert("invalid GL token in gl_logicop_to_sp()" == NULL);
 150       return 0;
 151    }
 152 }
 153
 154
 155 static void
 156 update_blend( struct st_context *st )
 157 {
 158    struct pipe_blend_state blend;
 159
 160    memset(&blend, 0, sizeof(blend));
 161
 162    if (st->ctx->Color.ColorLogicOpEnabled ||
 163        (st->ctx->Color.BlendEnabled &&
 164         st->ctx->Color.BlendEquationRGB == GL_LOGIC_OP)) {
 165       /* logicop enabled */
 166       blend.logicop_enable = 1;
 167       blend.logicop_func = gl_logicop_to_sp(st->ctx->Color.LogicOp);
 168    }
 169    else if (st->ctx->Color.BlendEnabled) {
 170       /* blending enabled */
 171       blend.blend_enable = 1;
 172
 173       blend.rgb_func = gl_blend_to_sp(st->ctx->Color.BlendEquationRGB);
 174       if (st->ctx->Color.BlendEquationRGB == GL_MIN ||
 175           st->ctx->Color.BlendEquationRGB == GL_MAX) {
 176          /* Min/max are special */
 177          blend.rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 178          blend.rgb_dst_factor = PIPE_BLENDFACTOR_ONE;
 179       }
 180       else {
 181          blend.rgb_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcRGB);
 182          blend.rgb_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstRGB);
 183       }
 184
 185       blend.alpha_func = gl_blend_to_sp(st->ctx->Color.BlendEquationA);
 186       if (st->ctx->Color.BlendEquationA == GL_MIN ||
 187           st->ctx->Color.BlendEquationA == GL_MAX) {
 188          /* Min/max are special */
 189          blend.alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 190          blend.alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
 191       }
 192       else {
 193          blend.alpha_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcA);
 194          blend.alpha_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstA);
 195       }
 196    }
 197    else {
 198       /* no blending / logicop */
 199    }
 200
 201    /* Colormask - maybe reverse these bits? */
 202    if (st->ctx->Color.ColorMask[0])
 203       blend.colormask |= PIPE_MASK_R;
 204    if (st->ctx->Color.ColorMask[1])
 205       blend.colormask |= PIPE_MASK_G;
 206    if (st->ctx->Color.ColorMask[2])
 207       blend.colormask |= PIPE_MASK_B;
 208    if (st->ctx->Color.ColorMask[3])
 209       blend.colormask |= PIPE_MASK_A;
 210
 211    if (st->ctx->Color.DitherFlag)
 212       blend.dither = 1;
 213
 214    const struct cso_blend *cso =
 215       st_cached_blend_state(st, &blend);
 216
 217    if (st->state.blend != cso) {
 218       /* state has changed */
 219       st->state.blend = cso;
 220       /* bind new state */
 221       st->pipe->bind_blend_state(st->pipe, cso->data);
 222    }
 223
 224    if (memcmp(st->ctx->Color.BlendColor, &st->state.blend_color, 4 * sizeof(GLfloat)) != 0) {
 225       /* state has changed */
 226       st->state.blend_color.color[0] = st->ctx->Color.BlendColor[0];
 227       st->state.blend_color.color[1] = st->ctx->Color.BlendColor[1];
 228       st->state.blend_color.color[2] = st->ctx->Color.BlendColor[2];
 229       st->state.blend_color.color[3] = st->ctx->Color.BlendColor[3];
 230       st->pipe->set_blend_color(st->pipe, (struct pipe_blend_color *) st->ctx->Color.BlendColor);
 231    }
 232 }
 233
 234
 235 const struct st_tracked_state st_update_blend = {
 236    .name = "st_update_blend",
 237    .dirty = {
 238       .mesa = (_NEW_COLOR),  /* XXX _NEW_BLEND someday? */
 239       .st  = 0,
 240    },
 241    .update = update_blend
 242 };
 243
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