src/mesa/vbo/vbo_exec_draw.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  5.1
   4  *
   5  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  */
  27
  28 #include "main/glheader.h"
  29 #include "main/context.h"
  30 #include "main/enums.h"
  31 #include "main/state.h"
  32 #include "main/macros.h"
  33
  34 #include "vbo_context.h"
  35
  36
  37 static void vbo_exec_debug_verts( struct vbo_exec_context *exec )
  38 {
  39    GLuint count = exec->vtx.vert_count;
  40    GLuint i;
  41
  42    _mesa_printf("%s: %u vertices %d primitives, %d vertsize\n",
  43                 __FUNCTION__,
  44                 count,
  45                 exec->vtx.prim_count,
  46                 exec->vtx.vertex_size);
  47
  48    for (i = 0 ; i < exec->vtx.prim_count ; i++) {
  49       struct _mesa_prim *prim = &exec->vtx.prim[i];
  50       _mesa_printf("   prim %d: %s%s %d..%d %s %s\n",
  51                    i,
  52                    _mesa_lookup_enum_by_nr(prim->mode),
  53                    prim->weak ? " (weak)" : "",
  54                    prim->start,
  55                    prim->start + prim->count,
  56                    prim->begin ? "BEGIN" : "(wrap)",
  57                    prim->end ? "END" : "(wrap)");
  58    }
  59 }
  60
  61
  62 /*
  63  * NOTE: Need to have calculated primitives by this point -- do it on the fly.
  64  * NOTE: Old 'parity' issue is gone.
  65  */
  66 static GLuint vbo_copy_vertices( struct vbo_exec_context *exec )
  67 {
  68    GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
  69    GLuint ovf, i;
  70    GLuint sz = exec->vtx.vertex_size;
  71    GLfloat *dst = exec->vtx.copied.buffer;
  72    GLfloat *src = ((GLfloat *)exec->vtx.buffer_map +
  73                    exec->vtx.prim[exec->vtx.prim_count-1].start *
  74                    exec->vtx.vertex_size);
  75
  76
  77    switch( exec->ctx->Driver.CurrentExecPrimitive )
  78    {
  79    case GL_POINTS:
  80       return 0;
  81    case GL_LINES:
  82       ovf = nr&1;
  83       for (i = 0 ; i < ovf ; i++)
  84          _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  85       return i;
  86    case GL_TRIANGLES:
  87       ovf = nr%3;
  88       for (i = 0 ; i < ovf ; i++)
  89          _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  90       return i;
  91    case GL_QUADS:
  92       ovf = nr&3;
  93       for (i = 0 ; i < ovf ; i++)
  94          _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  95       return i;
  96    case GL_LINE_STRIP:
  97       if (nr == 0)
  98          return 0;
  99       else {
 100          _mesa_memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 101          return 1;
 102       }
 103    case GL_LINE_LOOP:
 104    case GL_TRIANGLE_FAN:
 105    case GL_POLYGON:
 106       if (nr == 0)
 107          return 0;
 108       else if (nr == 1) {
 109          _mesa_memcpy( dst, src+0, sz * sizeof(GLfloat) );
 110          return 1;
 111       } else {
 112          _mesa_memcpy( dst, src+0, sz * sizeof(GLfloat) );
 113          _mesa_memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 114          return 2;
 115       }
 116    case GL_TRIANGLE_STRIP:
 117       /* no parity issue, but need to make sure the tri is not drawn twice */
 118       if (nr & 1) {
 119          exec->vtx.prim[exec->vtx.prim_count-1].count--;
 120       }
 121       /* fallthrough */
 122    case GL_QUAD_STRIP:
 123       switch (nr) {
 124       case 0: ovf = 0; break;
 125       case 1: ovf = 1; break;
 126       default: ovf = 2 + (nr&1); break;
 127       }
 128       for (i = 0 ; i < ovf ; i++)
 129          _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 130       return i;
 131    case GL_POLYGON+1:
 132       return 0;
 133    default:
 134       assert(0);
 135       return 0;
 136    }
 137 }
 138
 139
 140
 141 /* TODO: populate these as the vertex is defined:
 142  */
 143 static void vbo_exec_bind_arrays( GLcontext *ctx )
 144 {
 145    struct vbo_context *vbo = vbo_context(ctx);
 146    struct vbo_exec_context *exec = &vbo->exec;
 147    struct gl_client_array *arrays = exec->vtx.arrays;
 148    GLuint count = exec->vtx.vert_count;
 149    GLubyte *data = exec->vtx.buffer_map;
 150    const GLuint *map;
 151    GLuint attr;
 152
 153    /* Install the default (ie Current) attributes first, then overlay
 154     * all active ones.
 155     */
 156    switch (get_program_mode(exec->ctx)) {
 157    case VP_NONE:
 158       memcpy(arrays,      vbo->legacy_currval, 16 * sizeof(arrays[0]));
 159       memcpy(arrays + 16, vbo->mat_currval,    MAT_ATTRIB_MAX * sizeof(arrays[0]));
 160       map = vbo->map_vp_none;
 161       break;
 162    case VP_NV:
 163    case VP_ARB:
 164       /* The aliasing of attributes for NV vertex programs has already
 165        * occurred.  NV vertex programs cannot access material values,
 166        * nor attributes greater than VERT_ATTRIB_TEX7.
 167        */
 168       memcpy(arrays,      vbo->legacy_currval,  16 * sizeof(arrays[0]));
 169       memcpy(arrays + 16, vbo->generic_currval, 16 * sizeof(arrays[0]));
 170       map = vbo->map_vp_arb;
 171       break;
 172    }
 173
 174    /* Make all active attributes (including edgeflag) available as
 175     * arrays of floats.
 176     */
 177    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 178       const GLuint src = map[attr];
 179
 180       if (exec->vtx.attrsz[src]) {
 181          if (exec->vtx.bufferobj->Name) {
 182             /* a real buffer obj: Ptr is an offset, not a pointer*/
 183             int offset;
 184             assert(exec->vtx.bufferobj->Pointer);  /* buf should be mapped */
 185             offset = (GLbyte *) data - (GLbyte *) exec->vtx.bufferobj->Pointer;
 186             assert(offset >= 0);
 187             arrays[attr].Ptr = (void *) offset;
 188          }
 189          else {
 190             /* Ptr into ordinary app memory */
 191             arrays[attr].Ptr = (void *) data;
 192          }
 193          arrays[attr].Size = exec->vtx.attrsz[src];
 194          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 195          arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 196          arrays[attr].Type = GL_FLOAT;
 197          arrays[attr].Enabled = 1;
 198          arrays[attr].BufferObj = exec->vtx.bufferobj;
 199          arrays[attr]._MaxElement = count; /* ??? */
 200
 201          data += exec->vtx.attrsz[attr] * sizeof(GLfloat);
 202       }
 203    }
 204 }
 205
 206
 207 /**
 208  * Execute the buffer and save copied verts.
 209  */
 210 void vbo_exec_vtx_flush( struct vbo_exec_context *exec )
 211 {
 212    if (0)
 213       vbo_exec_debug_verts( exec );
 214
 215
 216    if (exec->vtx.prim_count &&
 217        exec->vtx.vert_count) {
 218
 219       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 220
 221       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 222          GLcontext *ctx = exec->ctx;
 223
 224          GLenum target = GL_ARRAY_BUFFER_ARB;
 225          GLenum access = GL_READ_WRITE_ARB;
 226          GLenum usage = GL_STREAM_DRAW_ARB;
 227          GLsizei size = VBO_VERT_BUFFER_SIZE * sizeof(GLfloat);
 228
 229          /* Before the unmap (why?)
 230           */
 231          vbo_exec_bind_arrays( ctx );
 232
 233          ctx->Driver.UnmapBuffer(ctx, target, exec->vtx.bufferobj);
 234          exec->vtx.buffer_map = NULL;
 235
 236          vbo_context(ctx)->draw_prims( ctx,
 237                                        exec->vtx.inputs,
 238                                        exec->vtx.prim,
 239                                        exec->vtx.prim_count,
 240                                        NULL,
 241                                        0,
 242                                        exec->vtx.vert_count - 1);
 243
 244          /* Get new data:
 245           */
 246          ctx->Driver.BufferData(ctx, target, size, NULL, usage, exec->vtx.bufferobj);
 247          exec->vtx.buffer_map
 248             = ctx->Driver.MapBuffer(ctx, target, access, exec->vtx.bufferobj);
 249       }
 250    }
 251
 252    exec->vtx.prim_count = 0;
 253    exec->vtx.vert_count = 0;
 254    exec->vtx.vbptr = (GLfloat *)exec->vtx.buffer_map;
 255 }