src/gallium/auxiliary/draw/draw_vertex.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * Post-transform vertex format info.  The vertex_info struct is used by
  30  * the draw_vbuf code to emit hardware-specific vertex layouts into hw
  31  * vertex buffers.
  32  *
  33  * Author:
  34  *    Brian Paul
  35  */
  36
  37
  38 #ifndef DRAW_VERTEX_H
  39 #define DRAW_VERTEX_H
  40
  41
  42 #include "pipe/p_state.h"
  43
  44
  45 /**
  46  * Vertex attribute emit modes
  47  */
  48 enum attrib_emit {
  49    EMIT_OMIT,      /**< don't emit the attribute */
  50    EMIT_ALL,       /**< emit whole post-xform vertex, w/ header */
  51    EMIT_1F,
  52    EMIT_1F_PSIZE,  /**< insert constant point size */
  53    EMIT_2F,
  54    EMIT_3F,
  55    EMIT_4F,
  56    EMIT_4UB  /**< XXX may need variations for RGBA vs BGRA, etc */
  57 };
  58
  59
  60 /**
  61  * Attribute interpolation mode
  62  */
  63 enum interp_mode {
  64    INTERP_NONE,      /**< never interpolate vertex header info */
  65    INTERP_POS,       /**< special case for frag position */
  66    INTERP_CONSTANT,
  67    INTERP_LINEAR,
  68    INTERP_PERSPECTIVE
  69 };
  70
  71
  72 /**
  73  * Information about hardware/rasterization vertex layout.
  74  */
  75 struct vertex_info
  76 {
  77    uint num_attribs;
  78    uint hwfmt[4];      /**< hardware format info for this format */
  79    enum interp_mode interp_mode[PIPE_MAX_SHADER_INPUTS];
  80    enum attrib_emit emit[PIPE_MAX_SHADER_INPUTS];   /**< EMIT_x */
  81    uint src_index[PIPE_MAX_SHADER_INPUTS]; /**< map to post-xform attribs */
  82    uint size;          /**< total vertex size in dwords */
  83 };
  84
  85
  86
  87 /**
  88  * Add another attribute to the given vertex_info object.
  89  * \param src_index  indicates which post-transformed vertex attrib slot
  90  *                   corresponds to this attribute.
  91  * \return slot in which the attribute was added
  92  */
  93 static INLINE uint
  94 draw_emit_vertex_attr(struct vertex_info *vinfo,
  95                       enum attrib_emit emit, enum interp_mode interp,
  96                       uint src_index)
  97 {
  98    const uint n = vinfo->num_attribs;
  99    assert(n < PIPE_MAX_SHADER_INPUTS);
 100    vinfo->emit[n] = emit;
 101    vinfo->interp_mode[n] = interp;
 102    vinfo->src_index[n] = src_index;
 103    vinfo->num_attribs++;
 104    return n;
 105 }
 106
 107
 108 extern void draw_compute_vertex_size(struct vertex_info *vinfo);
 109
 110
 111 #endif /* DRAW_VERTEX_H */