src/gallium/auxiliary/draw/draw_vs.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  27
  28 /* Authors:  Keith Whitwell <keith@tungstengraphics.com>
  29  */
  30
  31 #ifndef DRAW_VS_H
  32 #define DRAW_VS_H
  33
  34 #include "draw_context.h"
  35 #include "draw_private.h"
  36
  37
  38 struct draw_vertex_shader;
  39 struct draw_context;
  40 struct pipe_shader_state;
  41
  42 struct draw_vertex_shader *
  43 draw_create_vs_exec(struct draw_context *draw,
  44                     const struct pipe_shader_state *templ);
  45
  46 struct draw_vertex_shader *
  47 draw_create_vs_sse(struct draw_context *draw,
  48                    const struct pipe_shader_state *templ);
  49
  50 struct draw_vertex_shader *
  51 draw_create_vs_llvm(struct draw_context *draw,
  52                     const struct pipe_shader_state *templ);
  53
  54
  55 /* Should be part of the generated shader:
  56  */
  57 static INLINE unsigned
  58 compute_clipmask(const float *clip, /*const*/ float plane[][4], unsigned nr)
  59 {
  60    unsigned mask = 0x0;
  61    unsigned i;
  62
  63    /* Do the hardwired planes first:
  64     */
  65    if (-clip[0] + clip[3] < 0) mask |= CLIP_RIGHT_BIT;
  66    if ( clip[0] + clip[3] < 0) mask |= CLIP_LEFT_BIT;
  67    if (-clip[1] + clip[3] < 0) mask |= CLIP_TOP_BIT;
  68    if ( clip[1] + clip[3] < 0) mask |= CLIP_BOTTOM_BIT;
  69    if (-clip[2] + clip[3] < 0) mask |= CLIP_FAR_BIT;
  70    if ( clip[2] + clip[3] < 0) mask |= CLIP_NEAR_BIT;
  71
  72    /* Followed by any remaining ones:
  73     */
  74    for (i = 6; i < nr; i++) {
  75       if (dot4(clip, plane[i]) < 0)
  76          mask |= (1<<i);
  77    }
  78
  79    return mask;
  80 }
  81
  82
  83 #endif