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