src/mesa/state_tracker/st_atom_stencil.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 stencil func tokens to pipe tokens.
  43  */
  44 static GLuint
  45 gl_stencil_func_to_sp(GLenum func)
  46 {
  47    /* Same values, just biased */
  48    assert(PIPE_STENCIL_FUNC_NEVER == GL_NEVER - GL_NEVER);
  49    assert(PIPE_STENCIL_FUNC_LESS == GL_LESS - GL_NEVER);
  50    assert(PIPE_STENCIL_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
  51    assert(PIPE_STENCIL_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
  52    assert(PIPE_STENCIL_FUNC_GREATER == GL_GREATER - GL_NEVER);
  53    assert(PIPE_STENCIL_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
  54    assert(PIPE_STENCIL_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
  55    assert(PIPE_STENCIL_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
  56    assert(func >= GL_NEVER);
  57    assert(func <= GL_ALWAYS);
  58    return func - GL_NEVER;
  59 }
  60
  61
  62 /**
  63  * Convert GLenum stencil op tokens to pipe tokens.
  64  */
  65 static GLuint
  66 gl_stencil_op_to_sp(GLenum func)
  67 {
  68    switch (func) {
  69    case GL_KEEP:
  70       return PIPE_STENCIL_OP_KEEP;
  71    case GL_ZERO:
  72       return PIPE_STENCIL_OP_ZERO;
  73    case GL_REPLACE:
  74       return PIPE_STENCIL_OP_REPLACE;
  75    case GL_INCR:
  76       return PIPE_STENCIL_OP_INCR;
  77    case GL_DECR:
  78       return PIPE_STENCIL_OP_DECR;
  79    case GL_INCR_WRAP:
  80       return PIPE_STENCIL_OP_INCR_WRAP;
  81    case GL_DECR_WRAP:
  82       return PIPE_STENCIL_OP_DECR_WRAP;
  83    case GL_INVERT:
  84       return PIPE_STENCIL_OP_INVERT;
  85    default:
  86       assert("invalid GL token in gl_stencil_op_to_sp()" == NULL);
  87       return 0;
  88    }
  89 }
  90
  91
  92 static void
  93 update_stencil( struct st_context *st )
  94 {
  95    struct pipe_stencil_state stencil;
  96
  97    memset(&stencil, 0, sizeof(stencil));
  98
  99    if (st->ctx->Stencil.Enabled) {
 100       stencil.front_enabled = 1;
 101       stencil.front_func = gl_stencil_func_to_sp(st->ctx->Stencil.Function[0]);
 102       stencil.front_fail_op = gl_stencil_op_to_sp(st->ctx->Stencil.FailFunc[0]);
 103       stencil.front_zfail_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZFailFunc[0]);
 104       stencil.front_zpass_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZPassFunc[0]);
 105       stencil.ref_value[0] = st->ctx->Stencil.Ref[0] & 0xff;
 106       stencil.value_mask[0] = st->ctx->Stencil.ValueMask[0] & 0xff;
 107       stencil.write_mask[0] = st->ctx->Stencil.WriteMask[0] & 0xff;
 108       if (st->ctx->Stencil.TestTwoSide) {
 109          stencil.back_enabled = 1;
 110          stencil.back_func = gl_stencil_func_to_sp(st->ctx->Stencil.Function[1]);
 111          stencil.back_fail_op = gl_stencil_op_to_sp(st->ctx->Stencil.FailFunc[1]);
 112          stencil.back_zfail_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZFailFunc[1]);
 113          stencil.back_zpass_op = gl_stencil_op_to_sp(st->ctx->Stencil.ZPassFunc[1]);
 114          stencil.ref_value[1] = st->ctx->Stencil.Ref[1] & 0xff;
 115          stencil.value_mask[1] = st->ctx->Stencil.ValueMask[1] & 0xff;
 116          stencil.write_mask[1] = st->ctx->Stencil.WriteMask[1] & 0xff;
 117       }
 118       stencil.clear_value = st->ctx->Stencil.Clear & 0xff;
 119    }
 120
 121    if (memcmp(&stencil, &st->state.stencil, sizeof(stencil)) != 0) {
 122       /* state has changed */
 123       st->state.stencil = stencil;  /* struct copy */
 124       st->pipe->set_stencil_state(st->pipe, &stencil); /* set new state */
 125    }
 126 }
 127
 128
 129 const struct st_tracked_state st_update_stencil = {
 130    .dirty = {
 131       .mesa = (_NEW_STENCIL),
 132       .st  = 0,
 133    },
 134    .update = update_stencil
 135 };
 136
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