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  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. };
  164.