src/mesa/vbo/vbo_exec_draw.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.2
   4  *
   5  * Copyright (C) 1999-2008  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/bufferobj.h"
  30 #include "main/context.h"
  31 #include "main/enums.h"
  32 #include "main/state.h"
  33 #include "main/macros.h"
  34
  35 #include "vbo_context.h"
  36
  37
  38 static void vbo_exec_debug_verts( struct vbo_exec_context *exec )
  39 {
  40    GLuint count = exec->vtx.vert_count;
  41    GLuint i;
  42
  43    _mesa_printf("%s: %u vertices %d primitives, %d vertsize\n",
  44                 __FUNCTION__,
  45                 count,
  46                 exec->vtx.prim_count,
  47                 exec->vtx.vertex_size);
  48
  49    for (i = 0 ; i < exec->vtx.prim_count ; i++) {
  50       struct _mesa_prim *prim = &exec->vtx.prim[i];
  51       _mesa_printf("   prim %d: %s%s %d..%d %s %s\n",
  52                    i,
  53                    _mesa_lookup_enum_by_nr(prim->mode),
  54                    prim->weak ? " (weak)" : "",
  55                    prim->start,
  56                    prim->start + prim->count,
  57                    prim->begin ? "BEGIN" : "(wrap)",
  58                    prim->end ? "END" : "(wrap)");
  59    }
  60 }
  61
  62
  63 /*
  64  * NOTE: Need to have calculated primitives by this point -- do it on the fly.
  65  * NOTE: Old 'parity' issue is gone.
  66  */
  67 static GLuint vbo_copy_vertices( struct vbo_exec_context *exec )
  68 {
  69    GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
  70    GLuint ovf, i;
  71    GLuint sz = exec->vtx.vertex_size;
  72    GLfloat *dst = exec->vtx.copied.buffer;
  73    GLfloat *src = ((GLfloat *)exec->vtx.buffer_map +
  74                    exec->vtx.prim[exec->vtx.prim_count-1].start *
  75                    exec->vtx.vertex_size);
  76
  77
  78    switch( exec->ctx->Driver.CurrentExecPrimitive )
  79    {
  80    case GL_POINTS:
  81       return 0;
  82    case GL_LINES:
  83       ovf = nr&1;
  84       for (i = 0 ; i < ovf ; i++)
  85          _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  86       return i;
  87    case GL_TRIANGLES:
  88       ovf = nr%3;
  89       for (i = 0 ; i < ovf ; i++)
  90          _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  91       return i;
  92    case GL_QUADS:
  93       ovf = nr&3;
  94       for (i = 0 ; i < ovf ; i++)
  95          _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
  96       return i;
  97    case GL_LINE_STRIP:
  98       if (nr == 0)
  99          return 0;
 100       else {
 101          _mesa_memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 102          return 1;
 103       }
 104    case GL_LINE_LOOP:
 105    case GL_TRIANGLE_FAN:
 106    case GL_POLYGON:
 107       if (nr == 0)
 108          return 0;
 109       else if (nr == 1) {
 110          _mesa_memcpy( dst, src+0, sz * sizeof(GLfloat) );
 111          return 1;
 112       } else {
 113          _mesa_memcpy( dst, src+0, sz * sizeof(GLfloat) );
 114          _mesa_memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 115          return 2;
 116       }
 117    case GL_TRIANGLE_STRIP:
 118       /* no parity issue, but need to make sure the tri is not drawn twice */
 119       if (nr & 1) {
 120          exec->vtx.prim[exec->vtx.prim_count-1].count--;
 121       }
 122       /* fallthrough */
 123    case GL_QUAD_STRIP:
 124       switch (nr) {
 125       case 0: ovf = 0; break;
 126       case 1: ovf = 1; break;
 127       default: ovf = 2 + (nr&1); break;
 128       }
 129       for (i = 0 ; i < ovf ; i++)
 130          _mesa_memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
 131       return i;
 132    case PRIM_OUTSIDE_BEGIN_END:
 133       return 0;
 134    default:
 135       assert(0);
 136       return 0;
 137    }
 138 }
 139
 140
 141
 142 /* TODO: populate these as the vertex is defined:
 143  */
 144 static void vbo_exec_bind_arrays( GLcontext *ctx )
 145 {
 146    struct vbo_context *vbo = vbo_context(ctx);
 147    struct vbo_exec_context *exec = &vbo->exec;
 148    struct gl_client_array *arrays = exec->vtx.arrays;
 149    GLuint count = exec->vtx.vert_count;
 150    GLubyte *data = exec->vtx.buffer_map;
 151    const GLuint *map;
 152    GLuint attr;
 153    GLbitfield varying_inputs = 0x0;
 154
 155    /* Install the default (ie Current) attributes first, then overlay
 156     * all active ones.
 157     */
 158    switch (get_program_mode(exec->ctx)) {
 159    case VP_NONE:
 160       for (attr = 0; attr < 16; attr++) {
 161          exec->vtx.inputs[attr] = &vbo->legacy_currval[attr];
 162       }
 163       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
 164          exec->vtx.inputs[attr + 16] = &vbo->mat_currval[attr];
 165       }
 166       map = vbo->map_vp_none;
 167       break;
 168    case VP_NV:
 169    case VP_ARB:
 170       /* The aliasing of attributes for NV vertex programs has already
 171        * occurred.  NV vertex programs cannot access material values,
 172        * nor attributes greater than VERT_ATTRIB_TEX7.
 173        */
 174       for (attr = 0; attr < 16; attr++) {
 175          exec->vtx.inputs[attr] = &vbo->legacy_currval[attr];
 176          exec->vtx.inputs[attr + 16] = &vbo->generic_currval[attr];
 177       }
 178       map = vbo->map_vp_arb;
 179       break;
 180    }
 181
 182    /* Make all active attributes (including edgeflag) available as
 183     * arrays of floats.
 184     */
 185    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
 186       const GLuint src = map[attr];
 187
 188       if (exec->vtx.attrsz[src]) {
 189          /* override the default array set above */
 190          exec->vtx.inputs[attr] = &arrays[attr];
 191
 192          if (exec->vtx.bufferobj->Name) {
 193             /* a real buffer obj: Ptr is an offset, not a pointer*/
 194             int offset;
 195             assert(exec->vtx.bufferobj->Pointer);  /* buf should be mapped */
 196             offset = (GLbyte *) data - (GLbyte *) exec->vtx.bufferobj->Pointer;
 197             assert(offset >= 0);
 198             arrays[attr].Ptr = (void *) offset;
 199          }
 200          else {
 201             /* Ptr into ordinary app memory */
 202             arrays[attr].Ptr = (void *) data;
 203          }
 204          arrays[attr].Size = exec->vtx.attrsz[src];
 205          arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 206          arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 207          arrays[attr].Type = GL_FLOAT;
 208          arrays[attr].Enabled = 1;
 209          _mesa_reference_buffer_object(ctx,
 210                                        &arrays[attr].BufferObj,
 211                                        exec->vtx.bufferobj);
 212          arrays[attr]._MaxElement = count; /* ??? */
 213
 214          data += exec->vtx.attrsz[src] * sizeof(GLfloat);
 215          varying_inputs |= 1<<attr;
 216       }
 217    }
 218
 219    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
 220 }
 221
 222
 223 /**
 224  * Execute the buffer and save copied verts.
 225  */
 226 void vbo_exec_vtx_flush( struct vbo_exec_context *exec )
 227 {
 228    if (0)
 229       vbo_exec_debug_verts( exec );
 230
 231
 232    if (exec->vtx.prim_count &&
 233        exec->vtx.vert_count) {
 234
 235       exec->vtx.copied.nr = vbo_copy_vertices( exec );
 236
 237       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 238          GLcontext *ctx = exec->ctx;
 239
 240          GLenum target = GL_ARRAY_BUFFER_ARB;
 241          GLenum access = GL_READ_WRITE_ARB;
 242          GLenum usage = GL_STREAM_DRAW_ARB;
 243          GLsizei size = VBO_VERT_BUFFER_SIZE * sizeof(GLfloat);
 244
 245          /* Before the unmap (why?)
 246           */
 247          vbo_exec_bind_arrays( ctx );
 248
 249          if (ctx->NewState)
 250             _mesa_update_state( ctx );
 251
 252          /* if using a real VBO, unmap it before drawing */
 253          if (exec->vtx.bufferobj->Name) {
 254             ctx->Driver.UnmapBuffer(ctx, target, exec->vtx.bufferobj);
 255             exec->vtx.buffer_map = NULL;
 256          }
 257
 258          vbo_context(ctx)->draw_prims( ctx,
 259                                        exec->vtx.inputs,
 260                                        exec->vtx.prim,
 261                                        exec->vtx.prim_count,
 262                                        NULL,
 263                                        0,
 264                                        exec->vtx.vert_count - 1);
 265
 266          /* If using a real VBO, get new storage */
 267          if (exec->vtx.bufferobj->Name) {
 268             ctx->Driver.BufferData(ctx, target, size, NULL, usage, exec->vtx.bufferobj);
 269             exec->vtx.buffer_map =
 270                ctx->Driver.MapBuffer(ctx, target, access, exec->vtx.bufferobj);
 271          }
 272       }
 273    }
 274
 275    exec->vtx.prim_count = 0;
 276    exec->vtx.vert_count = 0;
 277    exec->vtx.vbptr = (GLfloat *)exec->vtx.buffer_map;
 278 }