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_1F,
  51    EMIT_1F_PSIZE,  /**< insert constant point size */
  52    EMIT_2F,
  53    EMIT_3F,
  54    EMIT_4F,
  55    EMIT_4UB  /**< XXX may need variations for RGBA vs BGRA, etc */
  56 };
  57
  58
  59 /**
  60  * Attribute interpolation mode
  61  */
  62 enum interp_mode {
  63    INTERP_NONE,      /**< never interpolate vertex header info */
  64    INTERP_POS,       /**< special case for frag position */
  65    INTERP_CONSTANT,
  66    INTERP_LINEAR,
  67    INTERP_PERSPECTIVE
  68 };
  69
  70
  71 /**
  72  * Information about hardware/rasterization vertex layout.
  73  */
  74 struct vertex_info
  75 {
  76    uint num_attribs;
  77    uint hwfmt[4];      /**< hardware format info for this format */
  78    uint size;          /**< total vertex size in dwords */
  79
  80    /* Keep this small and at the end of the struct to allow quick
  81     * memcmp() comparisons.
  82     */
  83    struct {
  84       unsigned interp_mode:4;      /**< INTERP_x */
  85       unsigned emit:4;             /**< EMIT_x */
  86       unsigned src_index:8;          /**< map to post-xform attribs */
  87    } attrib[PIPE_MAX_SHADER_INPUTS];
  88 };
  89
  90 static INLINE size_t
  91 draw_vinfo_size( const struct vertex_info *a )
  92 {
  93    return offsetof(const struct vertex_info, attrib[a->num_attribs]);
  94 }
  95
  96 static INLINE int
  97 draw_vinfo_compare( const struct vertex_info *a,
  98                     const struct vertex_info *b )
  99 {
 100    size_t sizea = draw_vinfo_size( a );
 101    return memcmp( a, b, sizea );
 102 }
 103
 104 static INLINE void
 105 draw_vinfo_copy( struct vertex_info *dst,
 106                  const struct vertex_info *src )
 107 {
 108    size_t size = draw_vinfo_size( src );
 109    memcpy( dst, src, size );
 110 }
 111
 112
 113
 114 /**
 115  * Add another attribute to the given vertex_info object.
 116  * \param src_index  indicates which post-transformed vertex attrib slot
 117  *                   corresponds to this attribute.
 118  * \return slot in which the attribute was added
 119  */
 120 static INLINE uint
 121 draw_emit_vertex_attr(struct vertex_info *vinfo,
 122                       enum attrib_emit emit,
 123                       enum interp_mode interp, /* only used by softpipe??? */
 124                       uint src_index)
 125 {
 126    const uint n = vinfo->num_attribs;
 127    assert(n < PIPE_MAX_SHADER_INPUTS);
 128    vinfo->attrib[n].emit = emit;
 129    vinfo->attrib[n].interp_mode = interp;
 130    vinfo->attrib[n].src_index = src_index;
 131    vinfo->num_attribs++;
 132    return n;
 133 }
 134
 135
 136 extern void draw_compute_vertex_size(struct vertex_info *vinfo);
 137
 138 void draw_dump_emitted_vertex(const struct vertex_info *vinfo,
 139                               const uint8_t *data);
 140
 141
 142 static INLINE unsigned draw_translate_vinfo_format(unsigned format )
 143 {
 144    switch (format) {
 145    case EMIT_1F:
 146    case EMIT_1F_PSIZE:
 147       return PIPE_FORMAT_R32_FLOAT;
 148    case EMIT_2F:
 149       return PIPE_FORMAT_R32G32_FLOAT;
 150    case EMIT_3F:
 151       return PIPE_FORMAT_R32G32B32_FLOAT;
 152    case EMIT_4F:
 153       return PIPE_FORMAT_R32G32B32A32_FLOAT;
 154    case EMIT_4UB:
 155       return PIPE_FORMAT_R8G8B8A8_UNORM;
 156    default:
 157       return PIPE_FORMAT_NONE;
 158    }
 159 }
 160
 161
 162 #endif /* DRAW_VERTEX_H */