src/mesa/state_tracker/st_atom_depth.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   *   Zack  Rusin
  33   */
  34
  35
  36 #include "st_context.h"
  37 #include "st_cache.h"
  38 #include "st_atom.h"
  39 #include "pipe/p_context.h"
  40 #include "pipe/p_defines.h"
  41
  42
  43 /**
  44  * Convert an OpenGL compare mode to a pipe tokens.
  45  */
  46 GLuint
  47 st_compare_func_to_pipe(GLenum func)
  48 {
  49    /* Same values, just biased */
  50    assert(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
  51    assert(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
  52    assert(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
  53    assert(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
  54    assert(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
  55    assert(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
  56    assert(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
  57    assert(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
  58    assert(func >= GL_NEVER);
  59    assert(func <= GL_ALWAYS);
  60    return func - GL_NEVER;
  61 }
  62
  63
  64 /**
  65  * Convert GLenum stencil op tokens to pipe tokens.
  66  */
  67 static GLuint
  68 gl_stencil_op_to_pipe(GLenum func)
  69 {
  70    switch (func) {
  71    case GL_KEEP:
  72       return PIPE_STENCIL_OP_KEEP;
  73    case GL_ZERO:
  74       return PIPE_STENCIL_OP_ZERO;
  75    case GL_REPLACE:
  76       return PIPE_STENCIL_OP_REPLACE;
  77    case GL_INCR:
  78       return PIPE_STENCIL_OP_INCR;
  79    case GL_DECR:
  80       return PIPE_STENCIL_OP_DECR;
  81    case GL_INCR_WRAP:
  82       return PIPE_STENCIL_OP_INCR_WRAP;
  83    case GL_DECR_WRAP:
  84       return PIPE_STENCIL_OP_DECR_WRAP;
  85    case GL_INVERT:
  86       return PIPE_STENCIL_OP_INVERT;
  87    default:
  88       assert("invalid GL token in gl_stencil_op_to_pipe()" == NULL);
  89       return 0;
  90    }
  91 }
  92
  93 static void
  94 update_depth_stencil(struct st_context *st)
  95 {
  96    struct pipe_depth_stencil_state depth_stencil;
  97    const struct cso_depth_stencil *cso;
  98
  99    memset(&depth_stencil, 0, sizeof(depth_stencil));
 100
 101    depth_stencil.depth.enabled = st->ctx->Depth.Test;
 102    depth_stencil.depth.writemask = st->ctx->Depth.Mask;
 103    depth_stencil.depth.func = st_compare_func_to_pipe(st->ctx->Depth.Func);
 104    depth_stencil.depth.clear = st->ctx->Depth.Clear;
 105
 106    if (st->ctx->Query.CurrentOcclusionObject &&
 107        st->ctx->Query.CurrentOcclusionObject->Active)
 108       depth_stencil.depth.occlusion_count = 1;
 109
 110    if (st->ctx->Stencil.Enabled) {
 111       depth_stencil.stencil.front_enabled = 1;
 112       depth_stencil.stencil.front_func = st_compare_func_to_pipe(st->ctx->Stencil.Function[0]);
 113       depth_stencil.stencil.front_fail_op = gl_stencil_op_to_pipe(st->ctx->Stencil.FailFunc[0]);
 114       depth_stencil.stencil.front_zfail_op = gl_stencil_op_to_pipe(st->ctx->Stencil.ZFailFunc[0]);
 115       depth_stencil.stencil.front_zpass_op = gl_stencil_op_to_pipe(st->ctx->Stencil.ZPassFunc[0]);
 116       depth_stencil.stencil.ref_value[0] = st->ctx->Stencil.Ref[0] & 0xff;
 117       depth_stencil.stencil.value_mask[0] = st->ctx->Stencil.ValueMask[0] & 0xff;
 118       depth_stencil.stencil.write_mask[0] = st->ctx->Stencil.WriteMask[0] & 0xff;
 119       if (st->ctx->Stencil.TestTwoSide) {
 120          depth_stencil.stencil.back_enabled = 1;
 121          depth_stencil.stencil.back_func = st_compare_func_to_pipe(st->ctx->Stencil.Function[1]);
 122          depth_stencil.stencil.back_fail_op = gl_stencil_op_to_pipe(st->ctx->Stencil.FailFunc[1]);
 123          depth_stencil.stencil.back_zfail_op = gl_stencil_op_to_pipe(st->ctx->Stencil.ZFailFunc[1]);
 124          depth_stencil.stencil.back_zpass_op = gl_stencil_op_to_pipe(st->ctx->Stencil.ZPassFunc[1]);
 125          depth_stencil.stencil.ref_value[1] = st->ctx->Stencil.Ref[1] & 0xff;
 126          depth_stencil.stencil.value_mask[1] = st->ctx->Stencil.ValueMask[1] & 0xff;
 127          depth_stencil.stencil.write_mask[1] = st->ctx->Stencil.WriteMask[1] & 0xff;
 128       }
 129       depth_stencil.stencil.clear_value = st->ctx->Stencil.Clear & 0xff;
 130    }
 131
 132    cso = st_cached_depth_stencil_state(st, &depth_stencil);
 133    if (st->state.depth_stencil != cso) {
 134       /* state has changed */
 135       st->state.depth_stencil = cso;
 136       st->pipe->bind_depth_stencil_state(st->pipe, cso->data); /* bind new state */
 137    }
 138 }
 139
 140
 141 const struct st_tracked_state st_update_depth_stencil = {
 142    .name = "st_update_depth_stencil",
 143    .dirty = {
 144       .mesa = (_NEW_DEPTH|_NEW_STENCIL),
 145       .st  = 0,
 146    },
 147    .update = update_depth_stencil
 148 };