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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 "main/mtypes.h"

#include "main/samplerobj.h"

#include "main/texobj.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 struct pipe_sampler_view *

st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,

					  struct st_texture_object *stObj,

                                          const struct gl_sampler_object *samp,

					  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 (stObj->pt->target == PIPE_BUFFER) {

      unsigned base, size;

      unsigned f, n;

      const struct util_format_description *desc

         = util_format_description(templ.format);

      base = stObj->base.BufferOffset;

      if (base >= stObj->pt->width0)

         return NULL;

      size = MIN2(stObj->pt->width0 - base, (unsigned)stObj->base.BufferSize);

      f = ((base * 8) / desc->block.bits) * desc->block.width;

      n = ((size * 8) / desc->block.bits) * desc->block.width;

      if (!n)

         return NULL;

      templ.u.buf.first_element = f;

      templ.u.buf.last_element  = f + (n - 1);

   } else {

      templ.u.tex.first_level = stObj->base.BaseLevel;

   }

   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 struct pipe_sampler_view *

st_get_texture_sampler_view_from_stobj(struct st_texture_object *stObj,

				       struct pipe_context *pipe,

                                       const struct gl_sampler_object *samp,

				       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, samp, format);

   }

   return stObj->sampler_view;

}

static GLboolean

update_single_texture(struct st_context *st,

                      struct pipe_sampler_view **sampler_view,

		      GLuint texUnit)

{

   struct pipe_context *pipe = st->pipe;

   struct gl_context *ctx = st->ctx;

   const struct gl_sampler_object *samp;

   struct gl_texture_object *texObj;

   struct st_texture_object *stObj;

   enum pipe_format view_format;

   GLboolean retval;

   samp = _mesa_get_samplerobj(ctx, texUnit);

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

   if (!texObj) {

      texObj = _mesa_get_fallback_texture(ctx, TEXTURE_2D_INDEX);

      samp = &texObj->Sampler;

   }

   stObj = st_texture_object(texObj);

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

   if (!retval) {

      /* out of mem */

      return GL_FALSE;

   }

   /* Determine the format of the texture sampler view */

   if (texObj->Target == GL_TEXTURE_BUFFER) {

      view_format =

         st_mesa_format_to_pipe_format(stObj->base._BufferObjectFormat);

   }

   else {

      view_format =

         stObj->surface_based ? stObj->surface_format : stObj->pt->format;

      /* If sRGB decoding is off, use the linear format */

      if (samp->sRGBDecode == GL_SKIP_DECODE_EXT) {

         view_format = util_format_linear(view_format);

      }

   }

   /* if sampler view has changed dereference it */

   if (stObj->sampler_view) {

      if (check_sampler_swizzle(stObj->sampler_view,

				stObj->base._Swizzle,

				stObj->base.DepthMode) ||

	  (view_format != stObj->sampler_view->format) ||

	  stObj->base.BaseLevel != stObj->sampler_view->u.tex.first_level) {

	 pipe_sampler_view_reference(&stObj->sampler_view, NULL);

      }

   }

   *sampler_view = st_get_texture_sampler_view_from_stobj(stObj, pipe,

							  samp,

							  view_format);

   return GL_TRUE;

}

static void

update_textures(struct st_context *st,

                unsigned shader_stage,

                const struct gl_program *prog,

                unsigned max_units,

                struct pipe_sampler_view **sampler_views,

                unsigned *num_textures)

{

   const GLuint old_max = *num_textures;

   GLbitfield samplers_used = prog->SamplersUsed;

   GLuint unit, new_count;

   if (samplers_used == 0x0 && old_max == 0)

      return;

   *num_textures = 0;

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

   for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {

      struct pipe_sampler_view *sampler_view = NULL;

      if (samplers_used & 1) {

         const GLuint texUnit = prog->SamplerUnits[unit];

         GLboolean retval;

         retval = update_single_texture(st, &sampler_view, texUnit);

         if (retval == GL_FALSE)

            continue;

         *num_textures = unit + 1;

      }

      else if (samplers_used == 0 && unit >= old_max) {

         /* if we've reset all the old views and we have no more new ones */

         break;

      }

      pipe_sampler_view_reference(&(sampler_views[unit]), sampler_view);

   }

   /* Ex: if old_max = 3 and *num_textures = 1, we need to pass an

    * array of views={X, NULL, NULL} to unref the old texture views

    * at positions [1] and [2].

    */

   new_count = MAX2(*num_textures, old_max);

   assert(new_count <= max_units);

   cso_set_sampler_views(st->cso_context,

                         shader_stage,

                         new_count,

                         sampler_views);

}

static void

update_vertex_textures(struct st_context *st)

{

   const struct gl_context *ctx = st->ctx;

   if (ctx->Const.VertexProgram.MaxTextureImageUnits > 0) {

      update_textures(st,

                      PIPE_SHADER_VERTEX,

                      &ctx->VertexProgram._Current->Base,

                      ctx->Const.VertexProgram.MaxTextureImageUnits,

                      st->state.sampler_views[PIPE_SHADER_VERTEX],

                      &st->state.num_sampler_views[PIPE_SHADER_VERTEX]);

   }

}

static void

update_fragment_textures(struct st_context *st)

{

   const struct gl_context *ctx = st->ctx;

   update_textures(st,

                   PIPE_SHADER_FRAGMENT,

                   &ctx->FragmentProgram._Current->Base,

                   ctx->Const.FragmentProgram.MaxTextureImageUnits,

                   st->state.sampler_views[PIPE_SHADER_FRAGMENT],

                   &st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);

}

static void

update_geometry_textures(struct st_context *st)

{

   const struct gl_context *ctx = st->ctx;

   if (ctx->GeometryProgram._Current) {

      update_textures(st,

                      PIPE_SHADER_GEOMETRY,

                      &ctx->GeometryProgram._Current->Base,

                      ctx->Const.FragmentProgram.MaxTextureImageUnits,

                      st->state.sampler_views[PIPE_SHADER_GEOMETRY],

                      &st->state.num_sampler_views[PIPE_SHADER_GEOMETRY]);

   }

}

const struct st_tracked_state st_update_fragment_texture = {

   "st_update_texture",					/* name */

   {							/* dirty */

      _NEW_TEXTURE,					/* mesa */

      ST_NEW_FRAGMENT_PROGRAM,				/* st */

   },

   update_fragment_textures				/* update */

};

const struct st_tracked_state st_update_vertex_texture = {

   "st_update_vertex_texture",				/* name */

   {							/* dirty */

      _NEW_TEXTURE,					/* mesa */

      ST_NEW_VERTEX_PROGRAM,				/* st */

   },

   update_vertex_textures				/* update */

};

const struct st_tracked_state st_update_geometry_texture = {

   "st_update_geometry_texture",			/* name */

   {							/* dirty */

      _NEW_TEXTURE,					/* mesa */

      ST_NEW_GEOMETRY_PROGRAM,				/* st */

   },

   update_geometry_textures				/* update */

};

static void

finalize_textures(struct st_context *st)

{

   struct gl_context *ctx = st->ctx;

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

   const GLboolean prev_missing_textures = st->missing_textures;

   GLuint su;

   st->missing_textures = GL_FALSE;

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

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

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

         struct gl_texture_object *texObj

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

         if (texObj) {

            GLboolean retval;

            retval = st_finalize_texture(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 */

};