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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

  */

#include "main/macros.h"

#include "program/prog_instruction.h"

#include "st_context.h"

#include "st_atom.h"

#include "st_texture.h"

#include "st_format.h"

#include "st_cb_texture.h"

#include "pipe/p_context.h"

#include "util/u_format.h"

#include "util/u_inlines.h"

#include "cso_cache/cso_context.h"

/**

 * Combine depth texture mode with "swizzle" so that depth mode swizzling

 * takes place before texture swizzling, and return the resulting swizzle.

 * If the format is not a depth format, return "swizzle" unchanged.

 *

 * \param format     PIPE_FORMAT_*.

 * \param swizzle    Texture swizzle, a bitmask computed using MAKE_SWIZZLE4.

 * \param depthmode  One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA, GL_RED.

 */

static GLuint apply_depthmode(enum pipe_format format,

                              GLuint swizzle, GLenum depthmode)

{

   const struct util_format_description *desc =

         util_format_description(format);

   unsigned char swiz[4];

   unsigned i;

   if (desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS ||

       desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_NONE) {

      /* Not a depth format. */

      return swizzle;

   }

   for (i = 0; i < 4; i++)

      swiz[i] = GET_SWZ(swizzle, i);

   switch (depthmode) {

      case GL_LUMINANCE:

         /* Rewrite reads from W to ONE, and reads from XYZ to XXX. */

         for (i = 0; i < 4; i++)

            if (swiz[i] == SWIZZLE_W)

               swiz[i] = SWIZZLE_ONE;

            else if (swiz[i] < SWIZZLE_W)

               swiz[i] = SWIZZLE_X;

         break;

      case GL_INTENSITY:

         /* Rewrite reads from XYZW to XXXX. */

         for (i = 0; i < 4; i++)

            if (swiz[i] <= SWIZZLE_W)

               swiz[i] = SWIZZLE_X;

         break;

      case GL_ALPHA:

         /* Rewrite reads from W to X, and reads from XYZ to 000. */

         for (i = 0; i < 4; i++)

            if (swiz[i] == SWIZZLE_W)

               swiz[i] = SWIZZLE_X;

            else if (swiz[i] < SWIZZLE_W)

               swiz[i] = SWIZZLE_ZERO;

         break;

      case GL_RED:

	 /* Rewrite reads W to 1, XYZ to X00 */

	 for (i = 0; i < 4; i++)

	    if (swiz[i] == SWIZZLE_W)

	       swiz[i] = SWIZZLE_ONE;

	    else if (swiz[i] == SWIZZLE_Y || swiz[i] == SWIZZLE_Z)

	       swiz[i] = SWIZZLE_ZERO;

	 break;

   }

   return MAKE_SWIZZLE4(swiz[0], swiz[1], swiz[2], swiz[3]);

}

/**

 * Return TRUE if the swizzling described by "swizzle" and

 * "depthmode" (for depth textures only) is different from the swizzling

 * set in the given sampler view.

 *

 * \param sv         A sampler view.

 * \param swizzle    Texture swizzle, a bitmask computed using MAKE_SWIZZLE4.

 * \param depthmode  One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA.

 */

static boolean check_sampler_swizzle(struct pipe_sampler_view *sv,

                                     GLuint swizzle, GLenum depthmode)

{

   swizzle = apply_depthmode(sv->texture->format, swizzle, depthmode);

   if ((sv->swizzle_r != GET_SWZ(swizzle, 0)) ||

       (sv->swizzle_g != GET_SWZ(swizzle, 1)) ||

       (sv->swizzle_b != GET_SWZ(swizzle, 2)) ||

       (sv->swizzle_a != GET_SWZ(swizzle, 3)))

      return true;

   return false;

}

static INLINE struct pipe_sampler_view *

st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,

					  struct st_texture_object *stObj,

					  enum pipe_format format)

{

   struct pipe_sampler_view templ;

   GLuint swizzle = apply_depthmode(stObj->pt->format,

                                    stObj->base._Swizzle,

                                    stObj->base.DepthMode);

   u_sampler_view_default_template(&templ,

                                   stObj->pt,

                                   format);

   if (swizzle != SWIZZLE_NOOP) {

      templ.swizzle_r = GET_SWZ(swizzle, 0);

      templ.swizzle_g = GET_SWZ(swizzle, 1);

      templ.swizzle_b = GET_SWZ(swizzle, 2);

      templ.swizzle_a = GET_SWZ(swizzle, 3);

   }

   return pipe->create_sampler_view(pipe, stObj->pt, &templ);

}

static INLINE struct pipe_sampler_view *

st_get_texture_sampler_view_from_stobj(struct st_texture_object *stObj,

				       struct pipe_context *pipe,

				       enum pipe_format format)

{

   if (!stObj || !stObj->pt) {

      return NULL;

   }

   if (!stObj->sampler_view) {

      stObj->sampler_view = st_create_texture_sampler_view_from_stobj(pipe, stObj, format);

   }

   return stObj->sampler_view;

}

static void

update_textures(struct st_context *st)

{

   struct pipe_context *pipe = st->pipe;

   struct gl_vertex_program *vprog = st->ctx->VertexProgram._Current;

   struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;

   const GLbitfield samplersUsed = (vprog->Base.SamplersUsed |

                                    fprog->Base.SamplersUsed);

   GLuint su;

   st->state.num_textures = 0;

   /* loop over sampler units (aka tex image units) */

   for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {

      struct pipe_sampler_view *sampler_view = NULL;

      enum pipe_format st_view_format;

      if (samplersUsed & (1 << su)) {

         struct gl_texture_object *texObj;

         struct st_texture_object *stObj;

         GLboolean retval;

         GLuint texUnit;

         if (fprog->Base.SamplersUsed & (1 << su))

            texUnit = fprog->Base.SamplerUnits[su];

         else

            texUnit = vprog->Base.SamplerUnits[su];

         texObj = st->ctx->Texture.Unit[texUnit]._Current;

         if (!texObj) {

            texObj = st_get_default_texture(st);

         }

         stObj = st_texture_object(texObj);

         retval = st_finalize_texture(st->ctx, st->pipe, texObj);

         if (!retval) {

            /* out of mem */

            continue;

         }

	 st_view_format = stObj->pt->format;

	 {

	    struct st_texture_image *firstImage;

	    enum pipe_format firstImageFormat;

	    firstImage = st_texture_image(stObj->base.Image[0][stObj->base.BaseLevel]);

	    firstImageFormat = st_mesa_format_to_pipe_format(firstImage->base.TexFormat);

	    if (firstImageFormat != stObj->pt->format)

	       st_view_format = firstImageFormat;

	 }

         st->state.num_textures = su + 1;

	 /* if sampler view has changed dereference it */

	 if (stObj->sampler_view)

            if (check_sampler_swizzle(stObj->sampler_view,

                                      stObj->base._Swizzle,

                                      stObj->base.DepthMode) ||

                (st_view_format != stObj->sampler_view->format))

	       pipe_sampler_view_reference(&stObj->sampler_view, NULL);

         sampler_view = st_get_texture_sampler_view_from_stobj(stObj, pipe, st_view_format);

      }

      pipe_sampler_view_reference(&st->state.sampler_views[su], sampler_view);

   }

   cso_set_fragment_sampler_views(st->cso_context,

                                  st->state.num_textures,

                                  st->state.sampler_views);

   if (st->ctx->Const.MaxVertexTextureImageUnits > 0) {

      cso_set_vertex_sampler_views(st->cso_context,

                                   MIN2(st->state.num_textures,

                                        st->ctx->Const.MaxVertexTextureImageUnits),

                                   st->state.sampler_views);

   }

}

const struct st_tracked_state st_update_texture = {

   "st_update_texture",					/* name */

   {							/* dirty */

      _NEW_TEXTURE,					/* mesa */

      ST_NEW_FRAGMENT_PROGRAM,				/* st */

   },

   update_textures					/* update */

};

static void

finalize_textures(struct st_context *st)

{

   struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;

   const GLboolean prev_missing_textures = st->missing_textures;

   GLuint su;

   st->missing_textures = GL_FALSE;

   for (su = 0; su < st->ctx->Const.MaxTextureCoordUnits; su++) {

      if (fprog->Base.SamplersUsed & (1 << su)) {

         const GLuint texUnit = fprog->Base.SamplerUnits[su];

         struct gl_texture_object *texObj

            = st->ctx->Texture.Unit[texUnit]._Current;

         if (texObj) {

            GLboolean retval;

            retval = st_finalize_texture(st->ctx, st->pipe, texObj);

            if (!retval) {

               /* out of mem */

               st->missing_textures = GL_TRUE;

               continue;

            }

         }

      }

   }

   if (prev_missing_textures != st->missing_textures)

      st->dirty.st |= ST_NEW_FRAGMENT_PROGRAM;

}

const struct st_tracked_state st_finalize_textures = {

   "st_finalize_textures",		/* name */

   {					/* dirty */

      _NEW_TEXTURE,			/* mesa */

      0,				/* st */

   },

   finalize_textures			/* update */

};