src/gallium/drivers/softpipe/sp_draw_arrays.c

/**************************************************************************
 * 
 * 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.
 * 
 **************************************************************************/

/* Author:
 *    Brian Paul
 *    Keith Whitwell
 */


#include "pipe/p_defines.h"
#include "pipe/p_context.h"
#include "pipe/internal/p_winsys_screen.h"
#include "pipe/p_inlines.h"
#include "util/u_prim.h"

#include "sp_context.h"
#include "sp_state.h"

#include "draw/draw_context.h"



static void
softpipe_map_constant_buffers(struct softpipe_context *sp)
{
   struct pipe_winsys *ws = sp->pipe.winsys;
   uint i, size;

   for (i = 0; i < PIPE_SHADER_TYPES; i++) {
      if (sp->constants[i].buffer && sp->constants[i].buffer->size)
         sp->mapped_constants[i] = ws->buffer_map(ws, sp->constants[i].buffer,
                                                  PIPE_BUFFER_USAGE_CPU_READ);
   }

   if (sp->constants[PIPE_SHADER_VERTEX].buffer)
      size = sp->constants[PIPE_SHADER_VERTEX].buffer->size;
   else
      size = 0;

   draw_set_mapped_constant_buffer(sp->draw,
                                   sp->mapped_constants[PIPE_SHADER_VERTEX],
                                   size);
}


static void
softpipe_unmap_constant_buffers(struct softpipe_context *sp)
{
   struct pipe_winsys *ws = sp->pipe.winsys;
   uint i;

   /* really need to flush all prims since the vert/frag shaders const buffers
    * are going away now.
    */
   draw_flush(sp->draw);

   draw_set_mapped_constant_buffer(sp->draw, NULL, 0);

   for (i = 0; i < 2; i++) {
      if (sp->constants[i].buffer && sp->constants[i].buffer->size)
         ws->buffer_unmap(ws, sp->constants[i].buffer);
      sp->mapped_constants[i] = NULL;
   }
}


boolean
softpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
                     unsigned start, unsigned count)
{
   return softpipe_draw_elements(pipe, NULL, 0, mode, start, count);
}


/**
 * Draw vertex arrays, with optional indexing.
 * Basically, map the vertex buffers (and drawing surfaces), then hand off
 * the drawing to the 'draw' module.
 */
boolean
softpipe_draw_range_elements(struct pipe_context *pipe,
                             struct pipe_buffer *indexBuffer,
                             unsigned indexSize,
                             unsigned min_index,
                             unsigned max_index,
                             unsigned mode, unsigned start, unsigned count)
{
   struct softpipe_context *sp = softpipe_context(pipe);
   struct draw_context *draw = sp->draw;
   unsigned i;

   sp->reduced_api_prim = u_reduced_prim(mode);

   if (sp->dirty)
      softpipe_update_derived( sp );

   softpipe_map_transfers(sp);
   softpipe_map_constant_buffers(sp);

   /*
    * Map vertex buffers
    */
   for (i = 0; i < sp->num_vertex_buffers; i++) {
      void *buf
         = pipe_buffer_map(pipe->screen,
                                    sp->vertex_buffer[i].buffer,
                                    PIPE_BUFFER_USAGE_CPU_READ);
      draw_set_mapped_vertex_buffer(draw, i, buf);
   }

   /* Map index buffer, if present */
   if (indexBuffer) {
      void *mapped_indexes
         = pipe_buffer_map(pipe->screen, indexBuffer,
                                    PIPE_BUFFER_USAGE_CPU_READ);
      draw_set_mapped_element_buffer_range(draw, indexSize,
                                           min_index,
                                           max_index,
                                           mapped_indexes);
   }
   else {
      /* no index/element buffer */
      draw_set_mapped_element_buffer_range(draw, 0, start,
                                           start + count - 1, NULL);
   }

   /* draw! */
   draw_arrays(draw, mode, start, count);

   /*
    * unmap vertex/index buffers - will cause draw module to flush
    */
   for (i = 0; i < sp->num_vertex_buffers; i++) {
      draw_set_mapped_vertex_buffer(draw, i, NULL);
      pipe_buffer_unmap(pipe->screen, sp->vertex_buffer[i].buffer);
   }
   if (indexBuffer) {
      draw_set_mapped_element_buffer(draw, 0, NULL);
      pipe_buffer_unmap(pipe->screen, indexBuffer);
   }


   /* Note: leave drawing surfaces mapped */
   softpipe_unmap_constant_buffers(sp);

   sp->dirty_render_cache = TRUE;
   
   return TRUE;
}


boolean
softpipe_draw_elements(struct pipe_context *pipe,
                       struct pipe_buffer *indexBuffer,
                       unsigned indexSize,
                       unsigned mode, unsigned start, unsigned count)
{
   return softpipe_draw_range_elements( pipe, indexBuffer,
                                        indexSize,
                                        0, 0xffffffff,
                                        mode, start, count );
}


void
softpipe_set_edgeflags(struct pipe_context *pipe, const unsigned *edgeflags)
{
   struct softpipe_context *sp = softpipe_context(pipe);
   draw_set_edgeflags(sp->draw, edgeflags);
}