src/mesa/state_tracker/st_atom_depth.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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 <keithw@vmware.com>
  31   *   Brian Paul
  32   *   Zack  Rusin
  33   */
  34
  35
  36 #include <assert.h>
  37
  38 #include "st_context.h"
  39 #include "st_atom.h"
  40 #include "pipe/p_context.h"
  41 #include "pipe/p_defines.h"
  42 #include "cso_cache/cso_context.h"
  43
  44 #include "main/core.h"
  45 #include "main/stencil.h"
  46
  47
  48 /**
  49  * Convert an OpenGL compare mode to a pipe tokens.
  50  */
  51 GLuint
  52 st_compare_func_to_pipe(GLenum func)
  53 {
  54    /* Same values, just biased */
  55    STATIC_ASSERT(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
  56    STATIC_ASSERT(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
  57    STATIC_ASSERT(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
  58    STATIC_ASSERT(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
  59    STATIC_ASSERT(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
  60    STATIC_ASSERT(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
  61    STATIC_ASSERT(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
  62    STATIC_ASSERT(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
  63    assert(func >= GL_NEVER);
  64    assert(func <= GL_ALWAYS);
  65    return func - GL_NEVER;
  66 }
  67
  68
  69 /**
  70  * Convert GLenum stencil op tokens to pipe tokens.
  71  */
  72 static GLuint
  73 gl_stencil_op_to_pipe(GLenum func)
  74 {
  75    switch (func) {
  76    case GL_KEEP:
  77       return PIPE_STENCIL_OP_KEEP;
  78    case GL_ZERO:
  79       return PIPE_STENCIL_OP_ZERO;
  80    case GL_REPLACE:
  81       return PIPE_STENCIL_OP_REPLACE;
  82    case GL_INCR:
  83       return PIPE_STENCIL_OP_INCR;
  84    case GL_DECR:
  85       return PIPE_STENCIL_OP_DECR;
  86    case GL_INCR_WRAP:
  87       return PIPE_STENCIL_OP_INCR_WRAP;
  88    case GL_DECR_WRAP:
  89       return PIPE_STENCIL_OP_DECR_WRAP;
  90    case GL_INVERT:
  91       return PIPE_STENCIL_OP_INVERT;
  92    default:
  93       assert("invalid GL token in gl_stencil_op_to_pipe()" == NULL);
  94       return 0;
  95    }
  96 }
  97
  98 static void
  99 update_depth_stencil_alpha(struct st_context *st)
 100 {
 101    struct pipe_depth_stencil_alpha_state *dsa = &st->state.depth_stencil;
 102    struct pipe_stencil_ref sr;
 103    struct gl_context *ctx = st->ctx;
 104
 105    memset(dsa, 0, sizeof(*dsa));
 106    memset(&sr, 0, sizeof(sr));
 107
 108    if (ctx->Depth.Test && ctx->DrawBuffer->Visual.depthBits > 0) {
 109       dsa->depth.enabled = 1;
 110       dsa->depth.writemask = ctx->Depth.Mask;
 111       dsa->depth.func = st_compare_func_to_pipe(ctx->Depth.Func);
 112    }
 113
 114    if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) {
 115       dsa->stencil[0].enabled = 1;
 116       dsa->stencil[0].func = st_compare_func_to_pipe(ctx->Stencil.Function[0]);
 117       dsa->stencil[0].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[0]);
 118       dsa->stencil[0].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[0]);
 119       dsa->stencil[0].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[0]);
 120       dsa->stencil[0].valuemask = ctx->Stencil.ValueMask[0] & 0xff;
 121       dsa->stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
 122       sr.ref_value[0] = _mesa_get_stencil_ref(ctx, 0);
 123
 124       if (ctx->Stencil._TestTwoSide) {
 125          const GLuint back = ctx->Stencil._BackFace;
 126          dsa->stencil[1].enabled = 1;
 127          dsa->stencil[1].func = st_compare_func_to_pipe(ctx->Stencil.Function[back]);
 128          dsa->stencil[1].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[back]);
 129          dsa->stencil[1].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[back]);
 130          dsa->stencil[1].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[back]);
 131          dsa->stencil[1].valuemask = ctx->Stencil.ValueMask[back] & 0xff;
 132          dsa->stencil[1].writemask = ctx->Stencil.WriteMask[back] & 0xff;
 133          sr.ref_value[1] = _mesa_get_stencil_ref(ctx, back);
 134       }
 135       else {
 136          /* This should be unnecessary. Drivers must not expect this to
 137           * contain valid data, except the enabled bit
 138           */
 139          dsa->stencil[1] = dsa->stencil[0];
 140          dsa->stencil[1].enabled = 0;
 141          sr.ref_value[1] = sr.ref_value[0];
 142       }
 143    }
 144
 145    if (ctx->Color.AlphaEnabled) {
 146       dsa->alpha.enabled = 1;
 147       dsa->alpha.func = st_compare_func_to_pipe(ctx->Color.AlphaFunc);
 148       dsa->alpha.ref_value = ctx->Color.AlphaRefUnclamped;
 149    }
 150
 151    cso_set_depth_stencil_alpha(st->cso_context, dsa);
 152    cso_set_stencil_ref(st->cso_context, &sr);
 153 }
 154
 155
 156 const struct st_tracked_state st_update_depth_stencil_alpha = {
 157    "st_update_depth_stencil",                           /* name */
 158    {                                                    /* dirty */
 159       (_NEW_DEPTH|_NEW_STENCIL|_NEW_COLOR|_NEW_BUFFERS),/* mesa */
 160       0,                                                /* st */
 161    },
 162    update_depth_stencil_alpha                           /* update */
 163 };