src/mesa/vbo/vbo_exec.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2005  Brian Paul   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 "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keithw@vmware.com>
  26  */
  27
  28
  29 #include "main/glheader.h"
  30 #include "main/arrayobj.h"
  31 #include "main/api_arrayelt.h"
  32 #include "main/vtxfmt.h"
  33 #include "vbo_private.h"
  34
  35 const GLubyte
  36 _vbo_attribute_alias_map[VP_MODE_MAX][VERT_ATTRIB_MAX] = {
  37    /* VP_MODE_FF: */
  38    {
  39       VBO_ATTRIB_POS,                 /* VERT_ATTRIB_POS */
  40       VBO_ATTRIB_NORMAL,              /* VERT_ATTRIB_NORMAL */
  41       VBO_ATTRIB_COLOR0,              /* VERT_ATTRIB_COLOR0 */
  42       VBO_ATTRIB_COLOR1,              /* VERT_ATTRIB_COLOR1 */
  43       VBO_ATTRIB_FOG,                 /* VERT_ATTRIB_FOG */
  44       VBO_ATTRIB_COLOR_INDEX,         /* VERT_ATTRIB_COLOR_INDEX */
  45       VBO_ATTRIB_EDGEFLAG,            /* VERT_ATTRIB_EDGEFLAG */
  46       VBO_ATTRIB_TEX0,                /* VERT_ATTRIB_TEX0 */
  47       VBO_ATTRIB_TEX1,                /* VERT_ATTRIB_TEX1 */
  48       VBO_ATTRIB_TEX2,                /* VERT_ATTRIB_TEX2 */
  49       VBO_ATTRIB_TEX3,                /* VERT_ATTRIB_TEX3 */
  50       VBO_ATTRIB_TEX4,                /* VERT_ATTRIB_TEX4 */
  51       VBO_ATTRIB_TEX5,                /* VERT_ATTRIB_TEX5 */
  52       VBO_ATTRIB_TEX6,                /* VERT_ATTRIB_TEX6 */
  53       VBO_ATTRIB_TEX7,                /* VERT_ATTRIB_TEX7 */
  54       VBO_ATTRIB_POINT_SIZE,          /* VERT_ATTRIB_POINT_SIZE */
  55       VBO_ATTRIB_GENERIC0,            /* VERT_ATTRIB_GENERIC0 */
  56       VBO_ATTRIB_GENERIC1,            /* VERT_ATTRIB_GENERIC1 */
  57       VBO_ATTRIB_GENERIC2,            /* VERT_ATTRIB_GENERIC2 */
  58       VBO_ATTRIB_GENERIC3,            /* VERT_ATTRIB_GENERIC3 */
  59       VBO_ATTRIB_MAT_FRONT_AMBIENT,   /* VERT_ATTRIB_GENERIC4 */
  60       VBO_ATTRIB_MAT_BACK_AMBIENT,    /* VERT_ATTRIB_GENERIC5 */
  61       VBO_ATTRIB_MAT_FRONT_DIFFUSE,   /* VERT_ATTRIB_GENERIC6 */
  62       VBO_ATTRIB_MAT_BACK_DIFFUSE,    /* VERT_ATTRIB_GENERIC7 */
  63       VBO_ATTRIB_MAT_FRONT_SPECULAR,  /* VERT_ATTRIB_GENERIC8 */
  64       VBO_ATTRIB_MAT_BACK_SPECULAR,   /* VERT_ATTRIB_GENERIC9 */
  65       VBO_ATTRIB_MAT_FRONT_EMISSION,  /* VERT_ATTRIB_GENERIC10 */
  66       VBO_ATTRIB_MAT_BACK_EMISSION,   /* VERT_ATTRIB_GENERIC11 */
  67       VBO_ATTRIB_MAT_FRONT_SHININESS, /* VERT_ATTRIB_GENERIC12 */
  68       VBO_ATTRIB_MAT_BACK_SHININESS,  /* VERT_ATTRIB_GENERIC13 */
  69       VBO_ATTRIB_MAT_FRONT_INDEXES,   /* VERT_ATTRIB_GENERIC14 */
  70       VBO_ATTRIB_MAT_BACK_INDEXES     /* VERT_ATTRIB_GENERIC15 */
  71    },
  72
  73    /* VP_MODE_SHADER: */
  74    {
  75       VBO_ATTRIB_POS,                 /* VERT_ATTRIB_POS */
  76       VBO_ATTRIB_NORMAL,              /* VERT_ATTRIB_NORMAL */
  77       VBO_ATTRIB_COLOR0,              /* VERT_ATTRIB_COLOR0 */
  78       VBO_ATTRIB_COLOR1,              /* VERT_ATTRIB_COLOR1 */
  79       VBO_ATTRIB_FOG,                 /* VERT_ATTRIB_FOG */
  80       VBO_ATTRIB_COLOR_INDEX,         /* VERT_ATTRIB_COLOR_INDEX */
  81       VBO_ATTRIB_EDGEFLAG,            /* VERT_ATTRIB_EDGEFLAG */
  82       VBO_ATTRIB_TEX0,                /* VERT_ATTRIB_TEX0 */
  83       VBO_ATTRIB_TEX1,                /* VERT_ATTRIB_TEX1 */
  84       VBO_ATTRIB_TEX2,                /* VERT_ATTRIB_TEX2 */
  85       VBO_ATTRIB_TEX3,                /* VERT_ATTRIB_TEX3 */
  86       VBO_ATTRIB_TEX4,                /* VERT_ATTRIB_TEX4 */
  87       VBO_ATTRIB_TEX5,                /* VERT_ATTRIB_TEX5 */
  88       VBO_ATTRIB_TEX6,                /* VERT_ATTRIB_TEX6 */
  89       VBO_ATTRIB_TEX7,                /* VERT_ATTRIB_TEX7 */
  90       VBO_ATTRIB_POINT_SIZE,          /* VERT_ATTRIB_POINT_SIZE */
  91       VBO_ATTRIB_GENERIC0,            /* VERT_ATTRIB_GENERIC0 */
  92       VBO_ATTRIB_GENERIC1,            /* VERT_ATTRIB_GENERIC1 */
  93       VBO_ATTRIB_GENERIC2,            /* VERT_ATTRIB_GENERIC2 */
  94       VBO_ATTRIB_GENERIC3,            /* VERT_ATTRIB_GENERIC3 */
  95       VBO_ATTRIB_GENERIC4,            /* VERT_ATTRIB_GENERIC4 */
  96       VBO_ATTRIB_GENERIC5,            /* VERT_ATTRIB_GENERIC5 */
  97       VBO_ATTRIB_GENERIC6,            /* VERT_ATTRIB_GENERIC6 */
  98       VBO_ATTRIB_GENERIC7,            /* VERT_ATTRIB_GENERIC7 */
  99       VBO_ATTRIB_GENERIC8,            /* VERT_ATTRIB_GENERIC8 */
 100       VBO_ATTRIB_GENERIC9,            /* VERT_ATTRIB_GENERIC9 */
 101       VBO_ATTRIB_GENERIC10,           /* VERT_ATTRIB_GENERIC10 */
 102       VBO_ATTRIB_GENERIC11,           /* VERT_ATTRIB_GENERIC11 */
 103       VBO_ATTRIB_GENERIC12,           /* VERT_ATTRIB_GENERIC12 */
 104       VBO_ATTRIB_GENERIC13,           /* VERT_ATTRIB_GENERIC13 */
 105       VBO_ATTRIB_GENERIC14,           /* VERT_ATTRIB_GENERIC14 */
 106       VBO_ATTRIB_GENERIC15            /* VERT_ATTRIB_GENERIC15 */
 107    }
 108 };
 109
 110
 111 void
 112 vbo_exec_init(struct gl_context *ctx, bool use_buffer_objects)
 113 {
 114    struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
 115
 116    exec->ctx = ctx;
 117
 118    vbo_exec_vtx_init(exec, use_buffer_objects);
 119
 120    ctx->Driver.NeedFlush = 0;
 121    ctx->Driver.CurrentExecPrimitive = PRIM_OUTSIDE_BEGIN_END;
 122
 123    exec->eval.recalculate_maps = GL_TRUE;
 124 }
 125
 126
 127 void vbo_exec_destroy( struct gl_context *ctx )
 128 {
 129    struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
 130
 131    vbo_exec_vtx_destroy( exec );
 132 }
 133
 134
 135 /**
 136  * In some degenarate cases we can improve our ability to merge
 137  * consecutive primitives.  For example:
 138  * glBegin(GL_LINE_STRIP);
 139  * glVertex(1);
 140  * glVertex(1);
 141  * glEnd();
 142  * glBegin(GL_LINE_STRIP);
 143  * glVertex(1);
 144  * glVertex(1);
 145  * glEnd();
 146  * Can be merged as a GL_LINES prim with four vertices.
 147  *
 148  * This function converts 2-vertex line strips/loops into GL_LINES, etc.
 149  */
 150 void
 151 vbo_try_prim_conversion(struct _mesa_prim *p)
 152 {
 153    if (p->mode == GL_LINE_STRIP && p->count == 2) {
 154       /* convert 2-vertex line strip to a separate line */
 155       p->mode = GL_LINES;
 156    }
 157    else if ((p->mode == GL_TRIANGLE_STRIP || p->mode == GL_TRIANGLE_FAN)
 158        && p->count == 3) {
 159       /* convert 3-vertex tri strip or fan to a separate triangle */
 160       p->mode = GL_TRIANGLES;
 161    }
 162
 163    /* Note: we can't convert a 4-vertex quad strip to a separate quad
 164     * because the vertex ordering is different.  We'd have to muck
 165     * around in the vertex data to make it work.
 166     */
 167 }
 168
 169
 170 /**
 171  * Helper function for determining if two subsequent glBegin/glEnd
 172  * primitives can be combined.  This is only possible for GL_POINTS,
 173  * GL_LINES, GL_TRIANGLES and GL_QUADS.
 174  * If we return true, it means that we can concatenate p1 onto p0 (and
 175  * discard p1).
 176  */
 177 bool
 178 vbo_can_merge_prims(const struct _mesa_prim *p0, const struct _mesa_prim *p1)
 179 {
 180    if (!p0->begin ||
 181        !p1->begin ||
 182        !p0->end ||
 183        !p1->end)
 184       return false;
 185
 186    /* The prim mode must match (ex: both GL_TRIANGLES) */
 187    if (p0->mode != p1->mode)
 188       return false;
 189
 190    /* p1's vertices must come right after p0 */
 191    if (p0->start + p0->count != p1->start)
 192       return false;
 193
 194    assert(p0->basevertex == p1->basevertex &&
 195           p0->num_instances == p1->num_instances &&
 196           p0->base_instance == p1->base_instance);
 197
 198    /* can always merge subsequent GL_POINTS primitives */
 199    if (p0->mode == GL_POINTS)
 200       return true;
 201
 202    /* independent lines with no extra vertices */
 203    if (p0->mode == GL_LINES && p0->count % 2 == 0 && p1->count % 2 == 0)
 204       return true;
 205
 206    /* independent tris */
 207    if (p0->mode == GL_TRIANGLES && p0->count % 3 == 0 && p1->count % 3 == 0)
 208       return true;
 209
 210    /* independent quads */
 211    if (p0->mode == GL_QUADS && p0->count % 4 == 0 && p1->count % 4 == 0)
 212       return true;
 213
 214    return false;
 215 }
 216
 217
 218 /**
 219  * If we've determined that p0 and p1 can be merged, this function
 220  * concatenates p1 onto p0.
 221  */
 222 void
 223 vbo_merge_prims(struct _mesa_prim *p0, const struct _mesa_prim *p1)
 224 {
 225    assert(vbo_can_merge_prims(p0, p1));
 226
 227    p0->count += p1->count;
 228    p0->end = p1->end;
 229 }