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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.

 *

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

/**

 * glRasterPos implementation.  Basically render a GL_POINT with our

 * private draw module.  Plug in a special "rasterpos" stage at the end

 * of the 'draw' pipeline to capture the results and update the current

 * raster pos attributes.

 *

 * Authors:

 *   Brian Paul

 */

#include "main/imports.h"

#include "main/macros.h"

#include "main/feedback.h"

#include "st_context.h"

#include "st_atom.h"

#include "st_draw.h"

#include "st_cb_rasterpos.h"

#include "draw/draw_context.h"

#include "draw/draw_pipe.h"

#include "vbo/vbo.h"

#if FEATURE_rastpos

/**

 * Our special drawing pipeline stage (replaces rasterization).

 */

struct rastpos_stage

{

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

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

   /* vertex attrib info we can setup once and re-use */

   struct gl_client_array array[VERT_ATTRIB_MAX];

   const struct gl_client_array *arrays[VERT_ATTRIB_MAX];

   struct _mesa_prim prim;

};

static INLINE struct rastpos_stage *

rastpos_stage( struct draw_stage *stage )

{

   return (struct rastpos_stage *) stage;

}

static void

rastpos_flush( struct draw_stage *stage, unsigned flags )

{

   /* no-op */

}

static void

rastpos_reset_stipple_counter( struct draw_stage *stage )

{

   /* no-op */

}

static void

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

{

   /* should never get here */

   assert(0);

}

static void

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

{

   /* should never get here */

   assert(0);

}

static void

rastpos_destroy(struct draw_stage *stage)

{

   free(stage);

}

/**

 * Update a raster pos attribute from the vertex result if it's present,

 * else copy the current attrib.

 */

static void

update_attrib(struct gl_context *ctx, const GLuint *outputMapping,

              const struct vertex_header *vert,

              GLfloat *dest,

              GLuint result, GLuint defaultAttrib)

{

   const GLfloat *src;

   const GLuint k = outputMapping[result];

   if (k != ~0U)

      src = vert->data[k];

   else

      src = ctx->Current.Attrib[defaultAttrib];

   COPY_4V(dest, src);

}

/**

 * Normally, this function would render a GL_POINT.

 */

static void

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

{

   struct rastpos_stage *rs = rastpos_stage(stage);

   struct gl_context *ctx = rs->ctx;

   struct st_context *st = st_context(ctx);

   const GLfloat height = (GLfloat) ctx->DrawBuffer->Height;

   const GLuint *outputMapping = st->vertex_result_to_slot;

   const GLfloat *pos;

   GLuint i;

   /* if we get here, we didn't get clipped */

   ctx->Current.RasterPosValid = GL_TRUE;

   /* update raster pos */

   pos = prim->v[0]->data[0];

   ctx->Current.RasterPos[0] = pos[0];

   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP)

      ctx->Current.RasterPos[1] = height - pos[1]; /* invert Y */

   else

      ctx->Current.RasterPos[1] = pos[1];

   ctx->Current.RasterPos[2] = pos[2];

   ctx->Current.RasterPos[3] = pos[3];

   /* update other raster attribs */

   update_attrib(ctx, outputMapping, prim->v[0],

                 ctx->Current.RasterColor,

                 VERT_RESULT_COL0, VERT_ATTRIB_COLOR0);

   update_attrib(ctx, outputMapping, prim->v[0],

                 ctx->Current.RasterSecondaryColor,

                 VERT_RESULT_COL1, VERT_ATTRIB_COLOR1);

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

      update_attrib(ctx, outputMapping, prim->v[0],

                    ctx->Current.RasterTexCoords[i],

                    VERT_RESULT_TEX0 + i, VERT_ATTRIB_TEX0 + i);

   }

   if (ctx->RenderMode == GL_SELECT) {

      _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );

   }

}

/**

 * Create rasterpos "drawing" stage.

 */

static struct rastpos_stage *

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

{

   struct rastpos_stage *rs = ST_CALLOC_STRUCT(rastpos_stage);

   GLuint i;

   rs->stage.draw = draw;

   rs->stage.next = NULL;

   rs->stage.point = rastpos_point;

   rs->stage.line = rastpos_line;

   rs->stage.tri = rastpos_tri;

   rs->stage.flush = rastpos_flush;

   rs->stage.destroy = rastpos_destroy;

   rs->stage.reset_stipple_counter = rastpos_reset_stipple_counter;

   rs->stage.destroy = rastpos_destroy;

   rs->ctx = ctx;

   for (i = 0; i < Elements(rs->array); i++) {

      rs->array[i].Size = 4;

      rs->array[i].Type = GL_FLOAT;

      rs->array[i].Format = GL_RGBA;

      rs->array[i].Stride = 0;

      rs->array[i].StrideB = 0;

      rs->array[i].Ptr = (GLubyte *) ctx->Current.Attrib[i];

      rs->array[i].Enabled = GL_TRUE;

      rs->array[i].Normalized = GL_TRUE;

      rs->array[i].BufferObj = NULL;

      rs->arrays[i] = &rs->array[i];

   }

   rs->prim.mode = GL_POINTS;

   rs->prim.indexed = 0;

   rs->prim.begin = 1;

   rs->prim.end = 1;

   rs->prim.weak = 0;

   rs->prim.start = 0;

   rs->prim.count = 1;

   return rs;

}

static void

st_RasterPos(struct gl_context *ctx, const GLfloat v[4])

{

   struct st_context *st = st_context(ctx);

   struct draw_context *draw = st->draw;

   struct rastpos_stage *rs;

   if (st->rastpos_stage) {

      /* get rastpos stage info */

      rs = rastpos_stage(st->rastpos_stage);

   }

   else {

      /* create rastpos draw stage */

      rs = new_draw_rastpos_stage(ctx, draw);

      st->rastpos_stage = &rs->stage;

   }

   /* plug our rastpos stage into the draw module */

   draw_set_rasterize_stage(st->draw, st->rastpos_stage);

   /* make sure everything's up to date */

   st_validate_state(st);

   /* This will get set only if rastpos_point(), above, gets called */

   ctx->Current.RasterPosValid = GL_FALSE;

   /* All vertex attribs but position were previously initialized above.

    * Just plug in position pointer now.

    */

   rs->array[0].Ptr = (GLubyte *) v;

   /* draw the point */

   st_feedback_draw_vbo(ctx, rs->arrays, &rs->prim, 1, NULL, GL_TRUE, 0, 1);

   /* restore draw's rasterization stage depending on rendermode */

   if (ctx->RenderMode == GL_FEEDBACK) {

      draw_set_rasterize_stage(draw, st->feedback_stage);

   }

   else if (ctx->RenderMode == GL_SELECT) {

      draw_set_rasterize_stage(draw, st->selection_stage);

   }

}

void st_init_rasterpos_functions(struct dd_function_table *functions)

{

   functions->RasterPos = st_RasterPos;

}

#endif /* FEATURE_rastpos */