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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 "util/u_draw.h"

#include "draw/draw_private.h"

#include "draw/draw_context.h"

/**

 * 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

}

/**

 * Helper for drawing current vertex arrays.

 */

static void

draw_arrays(struct draw_context *draw, unsigned mode,

            unsigned start, unsigned count)

{

   struct pipe_draw_info info;

   util_draw_init_info(&info);

   info.mode = mode;

   info.start = start;

   info.count = count;

   info.min_index = start;

   info.max_index = start + count - 1;

   draw_vbo(draw, &info);

}

/**

 * 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.

 */

void

st_feedback_draw_vbo(struct gl_context *ctx,

                     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 gl_transform_feedback_object *tfb_vertcount)

{

   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] = {NULL};

   struct pipe_transfer *ib_transfer = NULL;

   const struct gl_client_array **arrays = ctx->Array._DrawArrays;

   GLuint attr, i;

   const GLubyte *low_addr = NULL;

   const void *mapped_indices = NULL;

   assert(draw);

   st_validate_state(st);

   if (!index_bounds_valid)

      vbo_get_minmax_indices(ctx, prims, ib, &min_index, &max_index, nr_prims);

   /* must get these after state validation! */

   vp = st->vp;

   vs = &st->vp_variant->tgsi;

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

      st->vp_variant->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_states(draw, 0, 1, &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_variant->draw_shader);

   set_feedback_vertex_format(ctx);

   /* Find the lowest address of the arrays we're drawing */

   if (vp->num_inputs) {

      low_addr = arrays[vp->index_to_input[0]]->Ptr;

      for (attr = 1; attr < vp->num_inputs; attr++) {

         const GLubyte *start = arrays[vp->index_to_input[attr]]->Ptr;

         low_addr = MIN2(low_addr, start);

      }

   }

   /* 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;

         vbuffers[attr].user_buffer = NULL;

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

         vbuffers[attr].buffer_offset = pointer_to_offset(low_addr);

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

         /* 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,

                                       vbuffers[attr].buffer->width0);

      }

      else {

         vbuffers[attr].buffer = NULL;

         vbuffers[attr].user_buffer = arrays[mesaAttr]->Ptr;

         vbuffers[attr].buffer_offset = 0;

         velements[attr].src_offset = 0;

         draw_set_mapped_vertex_buffer(draw, attr, vbuffers[attr].user_buffer,

                                       ~0);

      }

      /* common-case setup */

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

      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,

                               arrays[mesaAttr]->Integer);

      assert(velements[attr].src_format);

      /* tell draw about this attribute */

#if 0

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

#endif

   }

   draw_set_vertex_buffers(draw, 0, 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;

      ibuffer.index_size = vbo_sizeof_ib_type(ib->type);

      if (ibuffer.index_size == 0)

         goto out_unref_vertex;

      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_indexes(draw,

                       (ubyte *) mapped_indices + ibuffer.offset,

                       ibuffer.index_size, ~0);

   }

   /* set the constant buffer */

   draw_set_mapped_constant_buffer(st->draw, PIPE_SHADER_VERTEX, 0,

                                   st->state.constants[PIPE_SHADER_VERTEX].ptr,

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

   /* draw here */

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

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

   }

   /*

    * unmap vertex/index buffers

    */

   if (ib) {

      draw_set_indexes(draw, NULL, 0, 0);

      if (ib_transfer)

         pipe_buffer_unmap(pipe, ib_transfer);

      pipe_resource_reference(&ibuffer.buffer, NULL);

   }

 out_unref_vertex:

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

      if (vb_transfer[attr])

         pipe_buffer_unmap(pipe, vb_transfer[attr]);

      draw_set_mapped_vertex_buffer(draw, attr, NULL, 0);

      pipe_resource_reference(&vbuffers[attr].buffer, NULL);

   }

   draw_set_vertex_buffers(draw, 0, vp->num_inputs, NULL);

}