src/mesa/vbo/vbo_context.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 #include "c99_alloca.h"
  29 #include "main/mtypes.h"
  30 #include "main/bufferobj.h"
  31 #include "math/m_eval.h"
  32 #include "main/vtxfmt.h"
  33 #include "main/api_arrayelt.h"
  34 #include "main/arrayobj.h"
  35 #include "main/varray.h"
  36 #include "vbo.h"
  37 #include "vbo_private.h"
  38
  39
  40 static GLuint
  41 check_size(const GLfloat *attr)
  42 {
  43    if (attr[3] != 1.0F)
  44       return 4;
  45    if (attr[2] != 0.0F)
  46       return 3;
  47    if (attr[1] != 0.0F)
  48       return 2;
  49    return 1;
  50 }
  51
  52
  53 /**
  54  * Helper for initializing a vertex array.
  55  */
  56 static void
  57 init_array(struct gl_context *ctx, struct gl_array_attributes *attrib,
  58            unsigned size, const void *pointer)
  59 {
  60    memset(attrib, 0, sizeof(*attrib));
  61
  62    attrib->Size = size;
  63    attrib->Type = GL_FLOAT;
  64    attrib->Format = GL_RGBA;
  65    attrib->Stride = 0;
  66    attrib->_ElementSize = size * sizeof(GLfloat);
  67    attrib->Ptr = pointer;
  68 }
  69
  70
  71 /**
  72  * Set up the vbo->currval arrays to point at the context's current
  73  * vertex attributes (with strides = 0).
  74  */
  75 static void
  76 init_legacy_currval(struct gl_context *ctx)
  77 {
  78    struct vbo_context *vbo = vbo_context(ctx);
  79    GLuint i;
  80
  81    /* Set up a constant (Stride == 0) array for each current
  82     * attribute:
  83     */
  84    for (i = 0; i < VERT_ATTRIB_FF_MAX; i++) {
  85       const unsigned attr = VERT_ATTRIB_FF(i);
  86       struct gl_array_attributes *attrib = &vbo->current[attr];
  87
  88       init_array(ctx, attrib, check_size(ctx->Current.Attrib[attr]),
  89                  ctx->Current.Attrib[attr]);
  90    }
  91 }
  92
  93
  94 static void
  95 init_generic_currval(struct gl_context *ctx)
  96 {
  97    struct vbo_context *vbo = vbo_context(ctx);
  98    GLuint i;
  99
 100    for (i = 0; i < VERT_ATTRIB_GENERIC_MAX; i++) {
 101       const unsigned attr = VBO_ATTRIB_GENERIC0 + i;
 102       struct gl_array_attributes *attrib = &vbo->current[attr];
 103
 104       init_array(ctx, attrib, 1, ctx->Current.Attrib[attr]);
 105    }
 106 }
 107
 108
 109 static void
 110 init_mat_currval(struct gl_context *ctx)
 111 {
 112    struct vbo_context *vbo = vbo_context(ctx);
 113    GLuint i;
 114
 115    /* Set up a constant (StrideB == 0) array for each current
 116     * attribute:
 117     */
 118    for (i = 0; i < MAT_ATTRIB_MAX; i++) {
 119       const unsigned attr = VBO_ATTRIB_MAT_FRONT_AMBIENT + i;
 120       struct gl_array_attributes *attrib = &vbo->current[attr];
 121       unsigned size;
 122
 123       /* Size is fixed for the material attributes, for others will
 124        * be determined at runtime:
 125        */
 126       switch (i) {
 127       case MAT_ATTRIB_FRONT_SHININESS:
 128       case MAT_ATTRIB_BACK_SHININESS:
 129          size = 1;
 130          break;
 131       case MAT_ATTRIB_FRONT_INDEXES:
 132       case MAT_ATTRIB_BACK_INDEXES:
 133          size = 3;
 134          break;
 135       default:
 136          size = 4;
 137          break;
 138       }
 139
 140       init_array(ctx, attrib, size, ctx->Light.Material.Attrib[i]);
 141    }
 142 }
 143
 144
 145 void
 146 _vbo_install_exec_vtxfmt(struct gl_context *ctx)
 147 {
 148    struct vbo_context *vbo = vbo_context(ctx);
 149
 150    _mesa_install_exec_vtxfmt(ctx, &vbo->exec.vtxfmt);
 151 }
 152
 153
 154 void
 155 vbo_exec_invalidate_state(struct gl_context *ctx)
 156 {
 157    struct vbo_context *vbo = vbo_context(ctx);
 158    struct vbo_exec_context *exec = &vbo->exec;
 159
 160    if (ctx->NewState & (_NEW_PROGRAM | _NEW_ARRAY)) {
 161       _ae_invalidate_state(ctx);
 162    }
 163    if (ctx->NewState & _NEW_EVAL)
 164       exec->eval.recalculate_maps = GL_TRUE;
 165 }
 166
 167
 168 GLboolean
 169 _vbo_CreateContext(struct gl_context *ctx)
 170 {
 171    struct vbo_context *vbo = CALLOC_STRUCT(vbo_context);
 172
 173    ctx->vbo_context = vbo;
 174
 175    /* Initialize the arrayelt helper
 176     */
 177    if (!ctx->aelt_context &&
 178        !_ae_create_context(ctx)) {
 179       return GL_FALSE;
 180    }
 181
 182    vbo->binding.Offset = 0;
 183    vbo->binding.Stride = 0;
 184    vbo->binding.InstanceDivisor = 0;
 185    _mesa_reference_buffer_object(ctx, &vbo->binding.BufferObj,
 186                                  ctx->Shared->NullBufferObj);
 187    init_legacy_currval(ctx);
 188    init_generic_currval(ctx);
 189    init_mat_currval(ctx);
 190
 191    /* make sure all VBO_ATTRIB_ values can fit in an unsigned byte */
 192    STATIC_ASSERT(VBO_ATTRIB_MAX <= 255);
 193
 194    /* Hook our functions into exec and compile dispatch tables.  These
 195     * will pretty much be permanently installed, which means that the
 196     * vtxfmt mechanism can be removed now.
 197     */
 198    vbo_exec_init(ctx);
 199    if (ctx->API == API_OPENGL_COMPAT)
 200       vbo_save_init(ctx);
 201
 202    vbo->VAO = _mesa_new_vao(ctx, ~((GLuint)0));
 203    /* The exec VAO assumes to have all arributes bound to binding 0 */
 204    for (unsigned i = 0; i < VERT_ATTRIB_MAX; ++i)
 205       _mesa_vertex_attrib_binding(ctx, vbo->VAO, i, 0, false);
 206
 207    _math_init_eval();
 208
 209    return GL_TRUE;
 210 }
 211
 212
 213 void
 214 _vbo_DestroyContext(struct gl_context *ctx)
 215 {
 216    struct vbo_context *vbo = vbo_context(ctx);
 217
 218    if (ctx->aelt_context) {
 219       _ae_destroy_context(ctx);
 220       ctx->aelt_context = NULL;
 221    }
 222
 223    if (vbo) {
 224
 225       _mesa_reference_buffer_object(ctx, &vbo->binding.BufferObj, NULL);
 226
 227       vbo_exec_destroy(ctx);
 228       if (ctx->API == API_OPENGL_COMPAT)
 229          vbo_save_destroy(ctx);
 230       _mesa_reference_vao(ctx, &vbo->VAO, NULL);
 231       free(vbo);
 232       ctx->vbo_context = NULL;
 233    }
 234 }
 235
 236
 237 /*
 238  * Helper function for _vbo_draw_indirect below that additionally takes a zero
 239  * initialized array of _mesa_prim scratch space memory as the last argument.
 240  */
 241 static void
 242 draw_indirect(struct gl_context *ctx, GLuint mode,
 243               struct gl_buffer_object *indirect_data,
 244               GLsizeiptr indirect_offset, unsigned draw_count,
 245               unsigned stride,
 246               struct gl_buffer_object *indirect_draw_count_buffer,
 247               GLsizeiptr indirect_draw_count_offset,
 248               const struct _mesa_index_buffer *ib,
 249               struct _mesa_prim *prim)
 250 {
 251    prim[0].begin = 1;
 252    prim[draw_count - 1].end = 1;
 253    for (unsigned i = 0; i < draw_count; ++i, indirect_offset += stride) {
 254       prim[i].mode = mode;
 255       prim[i].indexed = !!ib;
 256       prim[i].indirect_offset = indirect_offset;
 257       prim[i].is_indirect = 1;
 258       prim[i].draw_id = i;
 259    }
 260
 261    /* This should always be true at this time */
 262    assert(indirect_data == ctx->DrawIndirectBuffer);
 263
 264    ctx->Driver.Draw(ctx, prim, draw_count, ib, false, 0u, ~0u,
 265                     NULL, 0, indirect_data);
 266 }
 267
 268
 269 /*
 270  * Function to be put into dd_function_table::DrawIndirect as fallback.
 271  * Calls into dd_function_table::Draw past adapting call arguments.
 272  * See dd_function_table::DrawIndirect for call argument documentation.
 273  */
 274 void
 275 _vbo_draw_indirect(struct gl_context *ctx, GLuint mode,
 276                    struct gl_buffer_object *indirect_data,
 277                    GLsizeiptr indirect_offset, unsigned draw_count,
 278                    unsigned stride,
 279                    struct gl_buffer_object *indirect_draw_count_buffer,
 280                    GLsizeiptr indirect_draw_count_offset,
 281                    const struct _mesa_index_buffer *ib)
 282 {
 283    /* Use alloca for the prim space if we are somehow in bounds. */
 284    if (draw_count*sizeof(struct _mesa_prim) < 1024) {
 285       struct _mesa_prim *space = alloca(draw_count*sizeof(struct _mesa_prim));
 286       memset(space, 0, draw_count*sizeof(struct _mesa_prim));
 287
 288       draw_indirect(ctx, mode, indirect_data, indirect_offset, draw_count,
 289                     stride, indirect_draw_count_buffer,
 290                     indirect_draw_count_offset, ib, space);
 291    } else {
 292       struct _mesa_prim *space = calloc(draw_count, sizeof(struct _mesa_prim));
 293       if (space == NULL) {
 294          _mesa_error(ctx, GL_OUT_OF_MEMORY, "gl%sDraw%sIndirect%s",
 295                      (draw_count > 1) ? "Multi" : "",
 296                      ib ? "Elements" : "Arrays",
 297                      indirect_data ? "CountARB" : "");
 298          return;
 299       }
 300
 301       draw_indirect(ctx, mode, indirect_data, indirect_offset, draw_count,
 302                     stride, indirect_draw_count_buffer,
 303                     indirect_draw_count_offset, ib, space);
 304
 305       free(space);
 306    }
 307 }