workbench/libs/mesa/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_compiler.h"
  43 #include "pipe/p_state.h"
  44 #include "util/u_debug.h"
  45
  46
  47 /**
  48  * Vertex attribute emit modes
  49  */
  50 enum attrib_emit {
  51    EMIT_OMIT,      /**< don't emit the attribute */
  52    EMIT_1F,
  53    EMIT_1F_PSIZE,  /**< insert constant point size */
  54    EMIT_2F,
  55    EMIT_3F,
  56    EMIT_4F,
  57    EMIT_4UB, /**< is RGBA like the rest */
  58    EMIT_4UB_BGRA
  59 };
  60
  61
  62 /**
  63  * Attribute interpolation mode
  64  */
  65 enum interp_mode {
  66    INTERP_NONE,      /**< never interpolate vertex header info */
  67    INTERP_POS,       /**< special case for frag position */
  68    INTERP_CONSTANT,
  69    INTERP_LINEAR,
  70    INTERP_PERSPECTIVE
  71 };
  72
  73
  74 /**
  75  * Information about hardware/rasterization vertex layout.
  76  */
  77 struct vertex_info
  78 {
  79    uint num_attribs;
  80    uint hwfmt[4];      /**< hardware format info for this format */
  81    uint size;          /**< total vertex size in dwords */
  82
  83    /* Keep this small and at the end of the struct to allow quick
  84     * memcmp() comparisons.
  85     */
  86    struct {
  87       unsigned interp_mode:4;      /**< INTERP_x */
  88       unsigned emit:4;             /**< EMIT_x */
  89       unsigned src_index:8;          /**< map to post-xform attribs */
  90    } attrib[PIPE_MAX_SHADER_INPUTS];
  91 };
  92
  93 static INLINE size_t
  94 draw_vinfo_size( const struct vertex_info *a )
  95 {
  96    return offsetof(const struct vertex_info, attrib[a->num_attribs]);
  97 }
  98
  99 static INLINE int
 100 draw_vinfo_compare( const struct vertex_info *a,
 101                     const struct vertex_info *b )
 102 {
 103    size_t sizea = draw_vinfo_size( a );
 104    return memcmp( a, b, sizea );
 105 }
 106
 107 static INLINE void
 108 draw_vinfo_copy( struct vertex_info *dst,
 109                  const struct vertex_info *src )
 110 {
 111    size_t size = draw_vinfo_size( src );
 112    memcpy( dst, src, size );
 113 }
 114
 115
 116
 117 /**
 118  * Add another attribute to the given vertex_info object.
 119  * \param src_index  indicates which post-transformed vertex attrib slot
 120  *                   corresponds to this attribute.
 121  * \return slot in which the attribute was added
 122  */
 123 static INLINE uint
 124 draw_emit_vertex_attr(struct vertex_info *vinfo,
 125                       enum attrib_emit emit,
 126                       enum interp_mode interp, /* only used by softpipe??? */
 127                       uint src_index)
 128 {
 129    const uint n = vinfo->num_attribs;
 130    assert(n < PIPE_MAX_SHADER_INPUTS);
 131    vinfo->attrib[n].emit = emit;
 132    vinfo->attrib[n].interp_mode = interp;
 133    vinfo->attrib[n].src_index = src_index;
 134    vinfo->num_attribs++;
 135    return n;
 136 }
 137
 138
 139 extern void draw_compute_vertex_size(struct vertex_info *vinfo);
 140
 141 void draw_dump_emitted_vertex(const struct vertex_info *vinfo,
 142                               const uint8_t *data);
 143
 144
 145 static INLINE enum pipe_format draw_translate_vinfo_format(enum attrib_emit emit)
 146 {
 147    switch (emit) {
 148    case EMIT_OMIT:
 149       return PIPE_FORMAT_NONE;
 150    case EMIT_1F:
 151    case EMIT_1F_PSIZE:
 152       return PIPE_FORMAT_R32_FLOAT;
 153    case EMIT_2F:
 154       return PIPE_FORMAT_R32G32_FLOAT;
 155    case EMIT_3F:
 156       return PIPE_FORMAT_R32G32B32_FLOAT;
 157    case EMIT_4F:
 158       return PIPE_FORMAT_R32G32B32A32_FLOAT;
 159    case EMIT_4UB:
 160       return PIPE_FORMAT_R8G8B8A8_UNORM;
 161    case EMIT_4UB_BGRA:
 162       return PIPE_FORMAT_B8G8R8A8_UNORM;
 163    default:
 164       assert(!"unexpected format");
 165       return PIPE_FORMAT_NONE;
 166    }
 167 }
 168
 169 static INLINE unsigned draw_translate_vinfo_size(enum attrib_emit emit)
 170 {
 171    switch (emit) {
 172    case EMIT_OMIT:
 173       return 0;
 174    case EMIT_1F:
 175    case EMIT_1F_PSIZE:
 176       return 1 * sizeof(float);
 177    case EMIT_2F:
 178       return 2 * sizeof(float);
 179    case EMIT_3F:
 180       return 3 * sizeof(float);
 181    case EMIT_4F:
 182       return 4 * sizeof(float);
 183    case EMIT_4UB:
 184       return 4 * sizeof(unsigned char);
 185    case EMIT_4UB_BGRA:
 186       return 4 * sizeof(unsigned char);
 187    default:
 188       assert(!"unexpected format");
 189       return 0;
 190    }
 191 }
 192
 193 #endif /* DRAW_VERTEX_H */