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/mtypes.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_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_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)
 113 {
 114    struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
 115
 116    exec->ctx = ctx;
 117
 118    /* aelt_context should have been created by the caller */
 119    assert(ctx->aelt_context);
 120
 121    vbo_exec_vtx_init(exec);
 122
 123    ctx->Driver.NeedFlush = 0;
 124    ctx->Driver.CurrentExecPrimitive = PRIM_OUTSIDE_BEGIN_END;
 125
 126    /* The aelt_context state should still be dirty from its creation */
 127    assert(_ae_is_state_dirty(ctx));
 128
 129    exec->array.recalculate_inputs = GL_TRUE;
 130    exec->eval.recalculate_maps = GL_TRUE;
 131 }
 132
 133
 134 void vbo_exec_destroy( struct gl_context *ctx )
 135 {
 136    struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
 137
 138    if (ctx->aelt_context) {
 139       _ae_destroy_context( ctx );
 140       ctx->aelt_context = NULL;
 141    }
 142
 143    vbo_exec_vtx_destroy( exec );
 144 }
 145
 146
 147 /**
 148  * In some degenarate cases we can improve our ability to merge
 149  * consecutive primitives.  For example:
 150  * glBegin(GL_LINE_STRIP);
 151  * glVertex(1);
 152  * glVertex(1);
 153  * glEnd();
 154  * glBegin(GL_LINE_STRIP);
 155  * glVertex(1);
 156  * glVertex(1);
 157  * glEnd();
 158  * Can be merged as a GL_LINES prim with four vertices.
 159  *
 160  * This function converts 2-vertex line strips/loops into GL_LINES, etc.
 161  */
 162 void
 163 vbo_try_prim_conversion(struct _mesa_prim *p)
 164 {
 165    if (p->mode == GL_LINE_STRIP && p->count == 2) {
 166       /* convert 2-vertex line strip to a separate line */
 167       p->mode = GL_LINES;
 168    }
 169    else if ((p->mode == GL_TRIANGLE_STRIP || p->mode == GL_TRIANGLE_FAN)
 170        && p->count == 3) {
 171       /* convert 3-vertex tri strip or fan to a separate triangle */
 172       p->mode = GL_TRIANGLES;
 173    }
 174
 175    /* Note: we can't convert a 4-vertex quad strip to a separate quad
 176     * because the vertex ordering is different.  We'd have to muck
 177     * around in the vertex data to make it work.
 178     */
 179 }
 180
 181
 182 /**
 183  * Helper function for determining if two subsequent glBegin/glEnd
 184  * primitives can be combined.  This is only possible for GL_POINTS,
 185  * GL_LINES, GL_TRIANGLES and GL_QUADS.
 186  * If we return true, it means that we can concatenate p1 onto p0 (and
 187  * discard p1).
 188  */
 189 bool
 190 vbo_can_merge_prims(const struct _mesa_prim *p0, const struct _mesa_prim *p1)
 191 {
 192    if (!p0->begin ||
 193        !p1->begin ||
 194        !p0->end ||
 195        !p1->end)
 196       return false;
 197
 198    /* The prim mode must match (ex: both GL_TRIANGLES) */
 199    if (p0->mode != p1->mode)
 200       return false;
 201
 202    /* p1's vertices must come right after p0 */
 203    if (p0->start + p0->count != p1->start)
 204       return false;
 205
 206    if (p0->basevertex != p1->basevertex ||
 207        p0->num_instances != p1->num_instances ||
 208        p0->base_instance != p1->base_instance)
 209       return false;
 210
 211    /* can always merge subsequent GL_POINTS primitives */
 212    if (p0->mode == GL_POINTS)
 213       return true;
 214
 215    /* independent lines with no extra vertices */
 216    if (p0->mode == GL_LINES && p0->count % 2 == 0 && p1->count % 2 == 0)
 217       return true;
 218
 219    /* independent tris */
 220    if (p0->mode == GL_TRIANGLES && p0->count % 3 == 0 && p1->count % 3 == 0)
 221       return true;
 222
 223    /* independent quads */
 224    if (p0->mode == GL_QUADS && p0->count % 4 == 0 && p1->count % 4 == 0)
 225       return true;
 226
 227    return false;
 228 }
 229
 230
 231 /**
 232  * If we've determined that p0 and p1 can be merged, this function
 233  * concatenates p1 onto p0.
 234  */
 235 void
 236 vbo_merge_prims(struct _mesa_prim *p0, const struct _mesa_prim *p1)
 237 {
 238    assert(vbo_can_merge_prims(p0, p1));
 239
 240    p0->count += p1->count;
 241    p0->end = p1->end;
 242 }