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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.

 *

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

#include "main/imports.h"

#include "main/image.h"

#include "main/macros.h"

#include "vbo/vbo.h"

#include "st_context.h"

#include "st_atom.h"

#include "st_cb_bufferobjects.h"

#include "st_draw.h"

#include "st_program.h"

#include "pipe/p_context.h"

#include "pipe/p_defines.h"

#include "util/u_inlines.h"

#include "draw/draw_private.h"

#include "draw/draw_context.h"

#if FEATURE_feedback || FEATURE_rastpos

/**

 * Set the (private) draw module's post-transformed vertex format when in

 * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.

 */

static void

set_feedback_vertex_format(struct gl_context *ctx)

{

#if 0

   struct st_context *st = st_context(ctx);

   struct vertex_info vinfo;

   GLuint i;

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

   if (ctx->RenderMode == GL_SELECT) {

      assert(ctx->RenderMode == GL_SELECT);

      vinfo.num_attribs = 1;

      vinfo.format[0] = FORMAT_4F;

      vinfo.interp_mode[0] = INTERP_LINEAR;

   }

   else {

      /* GL_FEEDBACK, or glRasterPos */

      /* emit all attribs (pos, color, texcoord) as GLfloat[4] */

      vinfo.num_attribs = st->state.vs->cso->state.num_outputs;

      for (i = 0; i < vinfo.num_attribs; i++) {

         vinfo.format[i] = FORMAT_4F;

         vinfo.interp_mode[i] = INTERP_LINEAR;

      }

   }

   draw_set_vertex_info(st->draw, &vinfo);

#endif

}

/**

 * Called by VBO to draw arrays when in selection or feedback mode and

 * to implement glRasterPos.

 * This is very much like the normal draw_vbo() function above.

 * Look at code refactoring some day.

 * Might move this into the failover module some day.

 */

void

st_feedback_draw_vbo(struct gl_context *ctx,

                     const struct gl_client_array **arrays,

                     const struct _mesa_prim *prims,

                     GLuint nr_prims,

                     const struct _mesa_index_buffer *ib,

		     GLboolean index_bounds_valid,

                     GLuint min_index,

                     GLuint max_index)

{

   struct st_context *st = st_context(ctx);

   struct pipe_context *pipe = st->pipe;

   struct draw_context *draw = st->draw;

   const struct st_vertex_program *vp;

   const struct pipe_shader_state *vs;

   struct pipe_vertex_buffer vbuffers[PIPE_MAX_SHADER_INPUTS];

   struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];

   struct pipe_index_buffer ibuffer;

   struct pipe_transfer *vb_transfer[PIPE_MAX_ATTRIBS];

   struct pipe_transfer *ib_transfer = NULL;

   struct pipe_transfer *cb_transfer;

   GLuint attr, i;

   ubyte *mapped_constants;

   const void *mapped_indices = NULL;

   assert(draw);

   st_validate_state(st);

   if (!index_bounds_valid)

      vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);

   /* must get these after state validation! */

   vp = st->vp;

   vs = &st->vp_varient->tgsi;

   if (!st->vp_varient->draw_shader) {

      st->vp_varient->draw_shader = draw_create_vertex_shader(draw, vs);

   }

   /*

    * Set up the draw module's state.

    *

    * We'd like to do this less frequently, but the normal state-update

    * code sends state updates to the pipe, not to our private draw module.

    */

   assert(draw);

   draw_set_viewport_state(draw, &st->state.viewport);

   draw_set_clip_state(draw, &st->state.clip);

   draw_set_rasterizer_state(draw, &st->state.rasterizer, NULL);

   draw_bind_vertex_shader(draw, st->vp_varient->draw_shader);

   set_feedback_vertex_format(ctx);

   /* loop over TGSI shader inputs to determine vertex buffer

    * and attribute info

    */

   for (attr = 0; attr < vp->num_inputs; attr++) {

      const GLuint mesaAttr = vp->index_to_input[attr];

      struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;

      void *map;

      if (bufobj && bufobj->Name) {

         /* Attribute data is in a VBO.

          * Recall that for VBOs, the gl_client_array->Ptr field is

          * really an offset from the start of the VBO, not a pointer.

          */

         struct st_buffer_object *stobj = st_buffer_object(bufobj);

         assert(stobj->buffer);

         vbuffers[attr].buffer = NULL;

         pipe_resource_reference(&vbuffers[attr].buffer, stobj->buffer);

         vbuffers[attr].buffer_offset = pointer_to_offset(arrays[0]->Ptr);

         velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;

      }

      else {

         /* attribute data is in user-space memory, not a VBO */

         uint bytes = (arrays[mesaAttr]->Size

                       * _mesa_sizeof_type(arrays[mesaAttr]->Type)

                       * (max_index + 1));

         /* wrap user data */

         vbuffers[attr].buffer

            = pipe_user_buffer_create(pipe->screen, (void *) arrays[mesaAttr]->Ptr,

                                      bytes,

				      PIPE_BIND_VERTEX_BUFFER);

         vbuffers[attr].buffer_offset = 0;

         velements[attr].src_offset = 0;

      }

      /* common-case setup */

      vbuffers[attr].stride = arrays[mesaAttr]->StrideB; /* in bytes */

      vbuffers[attr].max_index = max_index;

      velements[attr].instance_divisor = 0;

      velements[attr].vertex_buffer_index = attr;

      velements[attr].src_format =

         st_pipe_vertex_format(arrays[mesaAttr]->Type,

                               arrays[mesaAttr]->Size,

                               arrays[mesaAttr]->Format,

                               arrays[mesaAttr]->Normalized);

      assert(velements[attr].src_format);

      /* tell draw about this attribute */

#if 0

      draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);

#endif

      /* map the attrib buffer */

      map = pipe_buffer_map(pipe, vbuffers[attr].buffer,

                            PIPE_TRANSFER_READ,

			    &vb_transfer[attr]);

      draw_set_mapped_vertex_buffer(draw, attr, map);

   }

   draw_set_vertex_buffers(draw, vp->num_inputs, vbuffers);

   draw_set_vertex_elements(draw, vp->num_inputs, velements);

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

   if (ib) {

      struct gl_buffer_object *bufobj = ib->obj;

      switch (ib->type) {

      case GL_UNSIGNED_INT:

         ibuffer.index_size = 4;

         break;

      case GL_UNSIGNED_SHORT:

         ibuffer.index_size = 2;

         break;

      case GL_UNSIGNED_BYTE:

         ibuffer.index_size = 1;

         break;

      default:

         assert(0);

	 return;

      }

      if (bufobj && bufobj->Name) {

         struct st_buffer_object *stobj = st_buffer_object(bufobj);

         pipe_resource_reference(&ibuffer.buffer, stobj->buffer);

         ibuffer.offset = pointer_to_offset(ib->ptr);

         mapped_indices = pipe_buffer_map(pipe, stobj->buffer,

                                          PIPE_TRANSFER_READ, &ib_transfer);

      }

      else {

         /* skip setting ibuffer.buffer as the draw module does not use it */

         mapped_indices = ib->ptr;

      }

      draw_set_index_buffer(draw, &ibuffer);

      draw_set_mapped_index_buffer(draw, mapped_indices);

   }

   /* map constant buffers */

   mapped_constants = pipe_buffer_map(pipe,

                                      st->state.constants[PIPE_SHADER_VERTEX],

                                      PIPE_TRANSFER_READ,

				      &cb_transfer);

   draw_set_mapped_constant_buffer(st->draw, PIPE_SHADER_VERTEX, 0,

                                   mapped_constants,

                                   st->state.constants[PIPE_SHADER_VERTEX]->width0);

   /* draw here */

   for (i = 0; i < nr_prims; i++) {

      draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);

   }

   /* unmap constant buffers */

   pipe_buffer_unmap(pipe, st->state.constants[PIPE_SHADER_VERTEX],

		     cb_transfer);

   /*

    * unmap vertex/index buffers

    */

   for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {

      if (draw->pt.vertex_buffer[i].buffer) {

         pipe_buffer_unmap(pipe, draw->pt.vertex_buffer[i].buffer,

			   vb_transfer[i]);

         pipe_resource_reference(&draw->pt.vertex_buffer[i].buffer, NULL);

         draw_set_mapped_vertex_buffer(draw, i, NULL);

      }

   }

   if (ib) {

      draw_set_mapped_index_buffer(draw, NULL);

      draw_set_index_buffer(draw, NULL);

      if (ib_transfer)

         pipe_buffer_unmap(pipe, ibuffer.buffer, ib_transfer);

      pipe_resource_reference(&ibuffer.buffer, NULL);

   }

}

#endif /* FEATURE_feedback || FEATURE_rastpos */