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PojavLauncherTeam
GitHub Repository: PojavLauncherTeam/mesa
 Path: blob/21.2-virgl/src/gallium/auxiliary/draw/draw_pt_util.c
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/**************************************************************************

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 * 

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 * Copyright 2007 VMware, Inc.

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 * All Rights Reserved.

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 * 

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 * Permission is hereby granted, free of charge, to any person obtaining a

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 * copy of this software and associated documentation files (the

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 * "Software"), to deal in the Software without restriction, including

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 * without limitation the rights to use, copy, modify, merge, publish,

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 * distribute, sub license, and/or sell copies of the Software, and to

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 * permit persons to whom the Software is furnished to do so, subject to

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 * the following conditions:

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 * 

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 * The above copyright notice and this permission notice (including the

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 * next paragraph) shall be included in all copies or substantial portions

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 * of the Software.

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 * 

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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.

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 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR

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 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

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 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

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 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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 * 

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

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 /*

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  * Authors:

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  *   Keith Whitwell <[email protected]>

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  */

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#include "draw/draw_context.h"

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#include "draw/draw_private.h"

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#include "draw/draw_pt.h"

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#include "util/u_debug.h"

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void draw_pt_split_prim(unsigned prim, unsigned *first, unsigned *incr)

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{

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   switch (prim) {

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   case PIPE_PRIM_POINTS:

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      *first = 1;

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      *incr = 1;

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      break;

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   case PIPE_PRIM_LINES:

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      *first = 2;

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      *incr = 2;

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      break;

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   case PIPE_PRIM_LINE_STRIP:

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   case PIPE_PRIM_LINE_LOOP:

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      *first = 2;

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      *incr = 1;

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      break;

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   case PIPE_PRIM_LINES_ADJACENCY:

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      *first = 4;

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      *incr = 4;

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      break;

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   case PIPE_PRIM_LINE_STRIP_ADJACENCY:

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      *first = 4;

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      *incr = 1;

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      break;

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   case PIPE_PRIM_TRIANGLES:

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      *first = 3;

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      *incr = 3;

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      break;

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   case PIPE_PRIM_TRIANGLES_ADJACENCY:

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      *first = 6;

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      *incr = 6;

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      break;

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   case PIPE_PRIM_TRIANGLE_STRIP:

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   case PIPE_PRIM_TRIANGLE_FAN:

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   case PIPE_PRIM_POLYGON:

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      *first = 3;

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      *incr = 1;

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      break;

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   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:

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      *first = 6;

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      *incr = 2;

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      break;

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   case PIPE_PRIM_QUADS:

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      *first = 4;

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      *incr = 4;

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      break;

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   case PIPE_PRIM_QUAD_STRIP:

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      *first = 4;

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      *incr = 2;

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      break;

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   default:

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      assert(0);

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      *first = 0;

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      *incr = 1;		/* set to one so that count % incr works */

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      break;

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   }

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}

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unsigned draw_pt_trim_count(unsigned count, unsigned first, unsigned incr)

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{

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   if (count < first)

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      return 0;

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   return count - (count - first) % incr;

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}

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