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path: root/src/mesa/vbo/vbo_exec_draw.c
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/*
 * Mesa 3-D graphics library
 * Version:  5.1
 *
 * Copyright (C) 1999-2003  Brian Paul   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, sublicense,
 * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL 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.
 *
 * Authors:
 *    Keith Whitwell <keith@tungstengraphics.com>
 */

#include "glheader.h"
#include "context.h"
#include "enums.h"
#include "state.h"
#include "macros.h"

#include "vbo_context.h"


static void vbo_exec_debug_verts( struct vbo_exec_context *exec )
{
   GLuint count = exec->vtx.vert_count;
   GLuint i;

   _mesa_printf("%s: %u vertices %d primitives, %d vertsize\n",
		__FUNCTION__,
		count,
		exec->vtx.prim_count,
		exec->vtx.vertex_size);

   for (i = 0 ; i < exec->vtx.prim_count ; i++) {
      struct _mesa_prim *prim = &exec->vtx.prim[i];
      _mesa_printf("   prim %d: %s%s %d..%d %s %s\n",
		   i, 
		   _mesa_lookup_enum_by_nr(prim->mode),
		   prim->weak ? " (weak)" : "",
		   prim->start, 
		   prim->start + prim->count,
		   prim->begin ? "BEGIN" : "(wrap)",
		   prim->end ? "END" : "(wrap)");
   }
}


/*
 * NOTE: Need to have calculated primitives by this point -- do it on the fly.
 * NOTE: Old 'parity' issue is gone.
 */
static GLuint vbo_copy_vertices( struct vbo_exec_context *exec )
{
   GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
   GLuint ovf, i;
   GLuint sz = exec->vtx.vertex_size;
   GLfloat *dst = exec->vtx.copied.buffer;
   GLfloat *src = ((GLfloat *)exec->vtx.buffer_map + 
		   exec->vtx.prim[exec->vtx.prim_count-1].start * 
		   exec->vtx.vertex_size);


   switch( exec->ctx->Driver.CurrentExecPrimitive )
   {
   case GL_POINTS:
      return 0;
   case GL_LINES:
      ovf = nr&1;
      for (i = 0 ; i < ovf ; i++)
	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
      return i;
   case GL_TRIANGLES:
      ovf = nr%3;
      for (i = 0 ; i < ovf ; i++)
	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
      return i;
   case GL_QUADS:
      ovf = nr&3;
      for (i = 0 ; i < ovf ; i++)
	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
      return i;
   case GL_LINE_STRIP:
      if (nr == 0) 
	 return 0;
      else {
	 _mesa_memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
	 return 1;
      }
   case GL_LINE_LOOP:
   case GL_TRIANGLE_FAN:
   case GL_POLYGON:
      if (nr == 0) 
	 return 0;
      else if (nr == 1) {
	 _mesa_memcpy( dst, src+0, sz * sizeof(GLfloat) );
	 return 1;
      } else {
	 _mesa_memcpy( dst, src+0, sz * sizeof(GLfloat) );
	 _mesa_memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
	 return 2;
      }
   case GL_TRIANGLE_STRIP:
   case GL_QUAD_STRIP:
      switch (nr) {
      case 0: ovf = 0; break;
      case 1: ovf = 1; break;
      default: ovf = 2 + (nr&1); break;
      }
      for (i = 0 ; i < ovf ; i++)
	 _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
      return i;
   case GL_POLYGON+1:
      return 0;
   default:
      assert(0);
      return 0;
   }
}


/* TODO: populate these as the vertex is defined:
 */
static void vbo_exec_bind_arrays( struct vbo_exec_context *exec )
{
   struct gl_client_array *arrays = exec->vtx.arrays;
   GLuint count = exec->vtx.vert_count;
   GLubyte *data = exec->vtx.buffer_map;
   GLuint attr;

   memcpy(arrays,      exec->legacy_currval, 16 * sizeof(arrays[0]));
   memcpy(arrays + 16, exec->mat_currval,    16 * sizeof(arrays[0]));

   /* Make all active attributes (including edgeflag) available as
    * arrays of floats.
    */
   for (attr = 0; attr < VBO_ATTRIB_MAX ; attr++) {
      if (exec->vtx.attrsz[attr]) {
	 arrays[attr].Ptr = (void *)data;
	 arrays[attr].Size = exec->vtx.attrsz[attr];
	 arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
	 arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
	 arrays[attr].Type = GL_FLOAT;
	 arrays[attr].Enabled = 1;
	 arrays[attr].BufferObj = exec->vtx.bufferobj; /* NullBufferObj */
	 arrays[attr]._MaxElement = count; /* ??? */

	 data += exec->vtx.attrsz[attr] * sizeof(GLfloat);
      }
   }
}


/**
 * Execute the buffer and save copied verts.
 */
void vbo_exec_vtx_flush( struct vbo_exec_context *exec )
{
   if (0)
      vbo_exec_debug_verts( exec );


   if (exec->vtx.prim_count && 
       exec->vtx.vert_count) {

      exec->vtx.copied.nr = vbo_copy_vertices( exec ); 

      if (exec->vtx.copied.nr != exec->vtx.vert_count) {
	 GLcontext *ctx = exec->ctx;

	 vbo_exec_bind_arrays( exec );

	 vbo_context(ctx)->draw_prims( ctx, 
				       exec->vtx.inputs, 
				       exec->vtx.prim, 
				       exec->vtx.prim_count,
				       NULL,
				       0,
				       exec->vtx.vert_count );
      }
   }

   exec->vtx.prim_count = 0;
   exec->vtx.vert_count = 0;
   exec->vtx.vbptr = (GLfloat *)exec->vtx.buffer_map;
}