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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.

 *

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

/**

 * GL_SELECT and GL_FEEDBACK render modes.

 * Basically, we use a private instance of the 'draw' module for doing

 * selection/feedback.  It would be nice to use the transform_feedback

 * hardware feature, but it's defined as happening pre-clip and we want

 * post-clipped primitives.  Also, there's concerns about the efficiency

 * of using the hardware for this anyway.

 *

 * Authors:

 *   Brian Paul

 */

#include "main/imports.h"

#include "main/context.h"

#include "main/feedback.h"

#include "vbo/vbo.h"

#include "st_context.h"

#include "st_draw.h"

#include "st_cb_feedback.h"

#include "pipe/p_context.h"

#include "pipe/p_defines.h"

#include "draw/draw_context.h"

#include "draw/draw_pipe.h"

/**

 * This is actually used for both feedback and selection.

 */

struct feedback_stage

{

   struct draw_stage stage;   /**< Base class */

   struct gl_context *ctx;            /**< Rendering context */

   GLboolean reset_stipple_counter;

};

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

 * GL Feedback functions

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

static INLINE struct feedback_stage *

feedback_stage( struct draw_stage *stage )

{

   return (struct feedback_stage *)stage;

}

static void

feedback_vertex(struct gl_context *ctx, const struct draw_context *draw,

                const struct vertex_header *v)

{

   const struct st_context *st = st_context(ctx);

   GLfloat win[4];

   const GLfloat *color, *texcoord;

   GLuint slot;

   /* Recall that Y=0=Top of window for Gallium wincoords */

   win[0] = v->data[0][0];

   win[1] = ctx->DrawBuffer->Height - v->data[0][1];

   win[2] = v->data[0][2];

   win[3] = 1.0F / v->data[0][3];

   /* XXX

    * When we compute vertex layout, save info about position of the

    * color and texcoord attribs to use here.

    */

   slot = st->vertex_result_to_slot[VARYING_SLOT_COL0];

   if (slot != ~0U)

      color = v->data[slot];

   else

      color = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];

   slot = st->vertex_result_to_slot[VARYING_SLOT_TEX0];

   if (slot != ~0U)

      texcoord = v->data[slot];

   else

      texcoord = ctx->Current.Attrib[VERT_ATTRIB_TEX0];

   _mesa_feedback_vertex(ctx, win, color, texcoord);

}

static void

feedback_tri( struct draw_stage *stage, struct prim_header *prim )

{

   struct feedback_stage *fs = feedback_stage(stage);

   struct draw_context *draw = stage->draw;

   _mesa_feedback_token(fs->ctx, (GLfloat) GL_POLYGON_TOKEN);

   _mesa_feedback_token(fs->ctx, (GLfloat) 3); /* three vertices */

   feedback_vertex(fs->ctx, draw, prim->v[0]);

   feedback_vertex(fs->ctx, draw, prim->v[1]);

   feedback_vertex(fs->ctx, draw, prim->v[2]);

}

static void

feedback_line( struct draw_stage *stage, struct prim_header *prim )

{

   struct feedback_stage *fs = feedback_stage(stage);

   struct draw_context *draw = stage->draw;

   if (fs->reset_stipple_counter) {

      _mesa_feedback_token(fs->ctx, (GLfloat) GL_LINE_RESET_TOKEN);

      fs->reset_stipple_counter = GL_FALSE;

   }

   else {

      _mesa_feedback_token(fs->ctx, (GLfloat) GL_LINE_TOKEN);

   }

   feedback_vertex(fs->ctx, draw, prim->v[0]);

   feedback_vertex(fs->ctx, draw, prim->v[1]);

}

static void

feedback_point( struct draw_stage *stage, struct prim_header *prim )

{

   struct feedback_stage *fs = feedback_stage(stage);

   struct draw_context *draw = stage->draw;

   _mesa_feedback_token(fs->ctx, (GLfloat) GL_POINT_TOKEN);

   feedback_vertex(fs->ctx, draw, prim->v[0]);

}

static void

feedback_flush( struct draw_stage *stage, unsigned flags )

{

   /* no-op */

}

static void

feedback_reset_stipple_counter( struct draw_stage *stage )

{

   struct feedback_stage *fs = feedback_stage(stage);

   fs->reset_stipple_counter = GL_TRUE;

}

static void

feedback_destroy( struct draw_stage *stage )

{

   /* no-op */

}

/**

 * Create GL feedback drawing stage.

 */

static struct draw_stage *

draw_glfeedback_stage(struct gl_context *ctx, struct draw_context *draw)

{

   struct feedback_stage *fs = ST_CALLOC_STRUCT(feedback_stage);

   fs->stage.draw = draw;

   fs->stage.next = NULL;

   fs->stage.point = feedback_point;

   fs->stage.line = feedback_line;

   fs->stage.tri = feedback_tri;

   fs->stage.flush = feedback_flush;

   fs->stage.reset_stipple_counter = feedback_reset_stipple_counter;

   fs->stage.destroy = feedback_destroy;

   fs->ctx = ctx;

   return &fs->stage;

}

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

 * GL Selection functions

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

static void

select_tri( struct draw_stage *stage, struct prim_header *prim )

{

   struct feedback_stage *fs = feedback_stage(stage);

   _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] );

   _mesa_update_hitflag( fs->ctx, prim->v[1]->data[0][2] );

   _mesa_update_hitflag( fs->ctx, prim->v[2]->data[0][2] );

}

static void

select_line( struct draw_stage *stage, struct prim_header *prim )

{

   struct feedback_stage *fs = feedback_stage(stage);

   _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] );

   _mesa_update_hitflag( fs->ctx, prim->v[1]->data[0][2] );

}

static void

select_point( struct draw_stage *stage, struct prim_header *prim )

{

   struct feedback_stage *fs = feedback_stage(stage);

   _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] );

}

static void

select_flush( struct draw_stage *stage, unsigned flags )

{

   /* no-op */

}

static void

select_reset_stipple_counter( struct draw_stage *stage )

{

   /* no-op */

}

static void

select_destroy( struct draw_stage *stage )

{

   /* no-op */

}

/**

 * Create GL selection mode drawing stage.

 */

static struct draw_stage *

draw_glselect_stage(struct gl_context *ctx, struct draw_context *draw)

{

   struct feedback_stage *fs = ST_CALLOC_STRUCT(feedback_stage);

   fs->stage.draw = draw;

   fs->stage.next = NULL;

   fs->stage.point = select_point;

   fs->stage.line = select_line;

   fs->stage.tri = select_tri;

   fs->stage.flush = select_flush;

   fs->stage.reset_stipple_counter = select_reset_stipple_counter;

   fs->stage.destroy = select_destroy;

   fs->ctx = ctx;

   return &fs->stage;

}

static void

st_RenderMode(struct gl_context *ctx, GLenum newMode )

{

   struct st_context *st = st_context(ctx);

   struct draw_context *draw = st->draw;

   if (newMode == GL_RENDER) {

      /* restore normal VBO draw function */

      vbo_set_draw_func(ctx, st_draw_vbo);

   }

   else if (newMode == GL_SELECT) {

      if (!st->selection_stage)

         st->selection_stage = draw_glselect_stage(ctx, draw);

      draw_set_rasterize_stage(draw, st->selection_stage);

      /* Plug in new vbo draw function */

      vbo_set_draw_func(ctx, st_feedback_draw_vbo);

   }

   else {

      if (!st->feedback_stage)

         st->feedback_stage = draw_glfeedback_stage(ctx, draw);

      draw_set_rasterize_stage(draw, st->feedback_stage);

      /* Plug in new vbo draw function */

      vbo_set_draw_func(ctx, st_feedback_draw_vbo);

      /* need to generate/use a vertex program that emits pos/color/tex */

      st->dirty.st |= ST_NEW_VERTEX_PROGRAM;

   }

}

void st_init_feedback_functions(struct dd_function_table *functions)

{

   functions->RenderMode = st_RenderMode;

}