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 #include "pipe/p_context.h"
  38 #include "pipe/p_defines.h"
  39
  40
  41 /**
  42  * Convert GLenum blend tokens to pipe tokens.
  43  * Both blend factors and blend funcs are accepted.
  44  */
  45 static GLuint
  46 gl_blend_to_sp(GLenum blend)
  47 {
  48    switch (blend) {
  49    /* blend functions */
  50    case GL_FUNC_ADD:
  51       return PIPE_BLEND_ADD;
  52    case GL_FUNC_SUBTRACT:
  53       return PIPE_BLEND_SUBTRACT;
  54    case GL_FUNC_REVERSE_SUBTRACT:
  55       return PIPE_BLEND_REVERSE_SUBTRACT;
  56    case GL_MIN:
  57       return PIPE_BLEND_MIN;
  58    case GL_MAX:
  59       return PIPE_BLEND_MAX;
  60
  61    /* blend factors */
  62    case GL_ONE:
  63       return PIPE_BLENDFACTOR_ONE;
  64    case GL_SRC_COLOR:
  65       return PIPE_BLENDFACTOR_SRC_COLOR;
  66    case GL_SRC_ALPHA:
  67       return PIPE_BLENDFACTOR_SRC_ALPHA;
  68    case GL_DST_ALPHA:
  69       return PIPE_BLENDFACTOR_DST_ALPHA;
  70    case GL_DST_COLOR:
  71       return PIPE_BLENDFACTOR_DST_COLOR;
  72    case GL_SRC_ALPHA_SATURATE:
  73       return PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE;
  74    case GL_CONSTANT_COLOR:
  75       return PIPE_BLENDFACTOR_CONST_COLOR;
  76    case GL_CONSTANT_ALPHA:
  77       return PIPE_BLENDFACTOR_CONST_ALPHA;
  78       /*
  79       return PIPE_BLENDFACTOR_SRC1_COLOR;
  80       return PIPE_BLENDFACTOR_SRC1_ALPHA;
  81       */
  82    case GL_ZERO:
  83       return PIPE_BLENDFACTOR_ZERO;
  84    case GL_ONE_MINUS_SRC_COLOR:
  85       return PIPE_BLENDFACTOR_INV_SRC_COLOR;
  86    case GL_ONE_MINUS_SRC_ALPHA:
  87       return PIPE_BLENDFACTOR_INV_SRC_ALPHA;
  88    case GL_ONE_MINUS_DST_COLOR:
  89       return PIPE_BLENDFACTOR_INV_DST_ALPHA;
  90    case GL_ONE_MINUS_DST_ALPHA:
  91       return PIPE_BLENDFACTOR_INV_DST_COLOR;
  92    case GL_ONE_MINUS_CONSTANT_COLOR:
  93       return PIPE_BLENDFACTOR_INV_CONST_COLOR;
  94    case GL_ONE_MINUS_CONSTANT_ALPHA:
  95       return PIPE_BLENDFACTOR_INV_CONST_ALPHA;
  96       /*
  97       return PIPE_BLENDFACTOR_INV_SRC1_COLOR;
  98       return PIPE_BLENDFACTOR_INV_SRC1_ALPHA;
  99       */
 100    default:
 101       assert("invalid GL token in gl_blend_to_sp()" == NULL);
 102       return 0;
 103    }
 104 }
 105
 106
 107 /**
 108  * Convert GLenum logicop tokens to pipe tokens.
 109  */
 110 static GLuint
 111 gl_logicop_to_sp(GLenum logicop)
 112 {
 113    switch (logicop) {
 114    case GL_CLEAR:
 115       return PIPE_LOGICOP_CLEAR;
 116    case GL_NOR:
 117       return PIPE_LOGICOP_NOR;
 118    case GL_AND_INVERTED:
 119       return PIPE_LOGICOP_AND_INVERTED;
 120    case GL_COPY_INVERTED:
 121       return PIPE_LOGICOP_COPY_INVERTED;
 122    case GL_AND_REVERSE:
 123       return PIPE_LOGICOP_AND_REVERSE;
 124    case GL_INVERT:
 125       return PIPE_LOGICOP_INVERT;
 126    case GL_XOR:
 127       return PIPE_LOGICOP_XOR;
 128    case GL_NAND:
 129       return PIPE_LOGICOP_NAND;
 130    case GL_AND:
 131       return PIPE_LOGICOP_AND;
 132    case GL_EQUIV:
 133       return PIPE_LOGICOP_EQUIV;
 134    case GL_NOOP:
 135       return PIPE_LOGICOP_NOOP;
 136    case GL_OR_INVERTED:
 137       return PIPE_LOGICOP_OR_INVERTED;
 138    case GL_COPY:
 139       return PIPE_LOGICOP_COPY;
 140    case GL_OR_REVERSE:
 141       return PIPE_LOGICOP_OR_REVERSE;
 142    case GL_OR:
 143       return PIPE_LOGICOP_OR;
 144    case GL_SET:
 145       return PIPE_LOGICOP_SET;
 146    default:
 147       assert("invalid GL token in gl_logicop_to_sp()" == NULL);
 148       return 0;
 149    }
 150 }
 151
 152
 153 static void
 154 update_blend( struct st_context *st )
 155 {
 156    struct pipe_blend_state blend;
 157
 158    memset(&blend, 0, sizeof(blend));
 159
 160    if (st->ctx->Color.ColorLogicOpEnabled ||
 161        (st->ctx->Color.BlendEnabled &&
 162         st->ctx->Color.BlendEquationRGB == GL_LOGIC_OP)) {
 163       /* logicop enabled */
 164       blend.logicop_enable = 1;
 165       blend.logicop_func = gl_logicop_to_sp(st->ctx->Color.LogicOp);
 166    }
 167    else if (st->ctx->Color.BlendEnabled) {
 168       /* blending enabled */
 169       blend.blend_enable = 1;
 170
 171       blend.rgb_func = gl_blend_to_sp(st->ctx->Color.BlendEquationRGB);
 172       blend.rgb_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcRGB);
 173       blend.rgb_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstRGB);
 174
 175       blend.alpha_func = gl_blend_to_sp(st->ctx->Color.BlendEquationA);
 176       blend.alpha_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcA);
 177       blend.alpha_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstA);
 178    }
 179    else {
 180       /* no blending / logicop */
 181    }
 182
 183    if (memcmp(&blend, &st->state.blend, sizeof(blend)) != 0) {
 184       /* state has changed */
 185       st->state.blend = blend;  /* struct copy */
 186       st->pipe->set_blend_state(st->pipe, &blend); /* set new state */
 187    }
 188 }
 189
 190
 191 const struct st_tracked_state st_update_blend = {
 192    .dirty = {
 193       .mesa = (_NEW_COLOR),  /* XXX _NEW_BLEND someday? */
 194       .st  = 0,
 195    },
 196    .update = update_blend
 197 };
 198
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