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/**************************************************************************

 *

 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.

 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR

 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 **************************************************************************/

 /*

  * Authors:

  *   Keith Whitwell 

  *   Brian Paul

  *   Zack  Rusin

  */

#include 

#include "st_context.h"

#include "st_atom.h"

#include "pipe/p_context.h"

#include "pipe/p_defines.h"

#include "cso_cache/cso_context.h"

#include "main/core.h"

#include "main/stencil.h"

/**

 * Convert an OpenGL compare mode to a pipe tokens.

 */

GLuint

st_compare_func_to_pipe(GLenum func)

{

   /* Same values, just biased */

   STATIC_ASSERT(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);

   STATIC_ASSERT(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);

   STATIC_ASSERT(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);

   STATIC_ASSERT(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);

   STATIC_ASSERT(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);

   STATIC_ASSERT(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);

   STATIC_ASSERT(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);

   STATIC_ASSERT(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);

   assert(func >= GL_NEVER);

   assert(func <= GL_ALWAYS);

   return func - GL_NEVER;

}

/**

 * Convert GLenum stencil op tokens to pipe tokens.

 */

static GLuint

gl_stencil_op_to_pipe(GLenum func)

{

   switch (func) {

   case GL_KEEP:

      return PIPE_STENCIL_OP_KEEP;

   case GL_ZERO:

      return PIPE_STENCIL_OP_ZERO;

   case GL_REPLACE:

      return PIPE_STENCIL_OP_REPLACE;

   case GL_INCR:

      return PIPE_STENCIL_OP_INCR;

   case GL_DECR:

      return PIPE_STENCIL_OP_DECR;

   case GL_INCR_WRAP:

      return PIPE_STENCIL_OP_INCR_WRAP;

   case GL_DECR_WRAP:

      return PIPE_STENCIL_OP_DECR_WRAP;

   case GL_INVERT:

      return PIPE_STENCIL_OP_INVERT;

   default:

      assert("invalid GL token in gl_stencil_op_to_pipe()" == NULL);

      return 0;

   }

}

static void

update_depth_stencil_alpha(struct st_context *st)

{

   struct pipe_depth_stencil_alpha_state *dsa = &st->state.depth_stencil;

   struct pipe_stencil_ref sr;

   struct gl_context *ctx = st->ctx;

   memset(dsa, 0, sizeof(*dsa));

   memset(&sr, 0, sizeof(sr));

   if (ctx->Depth.Test && ctx->DrawBuffer->Visual.depthBits > 0) {

      dsa->depth.enabled = 1;

      dsa->depth.writemask = ctx->Depth.Mask;

      dsa->depth.func = st_compare_func_to_pipe(ctx->Depth.Func);

   }

   if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) {

      dsa->stencil[0].enabled = 1;

      dsa->stencil[0].func = st_compare_func_to_pipe(ctx->Stencil.Function[0]);

      dsa->stencil[0].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[0]);

      dsa->stencil[0].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[0]);

      dsa->stencil[0].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[0]);

      dsa->stencil[0].valuemask = ctx->Stencil.ValueMask[0] & 0xff;

      dsa->stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;

      sr.ref_value[0] = _mesa_get_stencil_ref(ctx, 0);

      if (ctx->Stencil._TestTwoSide) {

         const GLuint back = ctx->Stencil._BackFace;

         dsa->stencil[1].enabled = 1;

         dsa->stencil[1].func = st_compare_func_to_pipe(ctx->Stencil.Function[back]);

         dsa->stencil[1].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[back]);

         dsa->stencil[1].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[back]);

         dsa->stencil[1].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[back]);

         dsa->stencil[1].valuemask = ctx->Stencil.ValueMask[back] & 0xff;

         dsa->stencil[1].writemask = ctx->Stencil.WriteMask[back] & 0xff;

         sr.ref_value[1] = _mesa_get_stencil_ref(ctx, back);

      }

      else {

         /* This should be unnecessary. Drivers must not expect this to

          * contain valid data, except the enabled bit

          */

         dsa->stencil[1] = dsa->stencil[0];

         dsa->stencil[1].enabled = 0;

         sr.ref_value[1] = sr.ref_value[0];

      }

   }

   if (ctx->Color.AlphaEnabled) {

      dsa->alpha.enabled = 1;

      dsa->alpha.func = st_compare_func_to_pipe(ctx->Color.AlphaFunc);

      dsa->alpha.ref_value = ctx->Color.AlphaRefUnclamped;

   }

   cso_set_depth_stencil_alpha(st->cso_context, dsa);

   cso_set_stencil_ref(st->cso_context, &sr);

}

const struct st_tracked_state st_update_depth_stencil_alpha = {

   "st_update_depth_stencil",				/* name */

   {							/* dirty */

      (_NEW_DEPTH|_NEW_STENCIL|_NEW_COLOR|_NEW_BUFFERS),/* mesa */

      0,						/* st */

   },

   update_depth_stencil_alpha				/* update */

};