gpu/command_buffer/service/vertex_attrib_manager.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gpu/command_buffer/service/vertex_attrib_manager.h"
   6
   7 #include <list>
   8
   9 #include "base/logging.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "build/build_config.h"
  13 #define GLES2_GPU_SERVICE 1
  14 #include "gpu/command_buffer/common/gles2_cmd_format.h"
  15 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
  16 #include "gpu/command_buffer/service/buffer_manager.h"
  17 #include "gpu/command_buffer/service/error_state.h"
  18 #include "gpu/command_buffer/service/feature_info.h"
  19 #include "gpu/command_buffer/service/gl_utils.h"
  20 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
  21 #include "gpu/command_buffer/service/gpu_switches.h"
  22 #include "gpu/command_buffer/service/program_manager.h"
  23 #include "gpu/command_buffer/service/vertex_array_manager.h"
  24
  25 namespace gpu {
  26 namespace gles2 {
  27
  28 VertexAttrib::VertexAttrib()
  29     : index_(0),
  30       enabled_(false),
  31       size_(4),
  32       type_(GL_FLOAT),
  33       offset_(0),
  34       normalized_(GL_FALSE),
  35       gl_stride_(0),
  36       real_stride_(16),
  37       divisor_(0),
  38       integer_(GL_FALSE),
  39       is_client_side_array_(false),
  40       list_(NULL) {
  41 }
  42
  43 VertexAttrib::~VertexAttrib() {
  44 }
  45
  46 void VertexAttrib::SetInfo(
  47     Buffer* buffer,
  48     GLint size,
  49     GLenum type,
  50     GLboolean normalized,
  51     GLsizei gl_stride,
  52     GLsizei real_stride,
  53     GLsizei offset,
  54     GLboolean integer) {
  55   DCHECK_GT(real_stride, 0);
  56   buffer_ = buffer;
  57   size_ = size;
  58   type_ = type;
  59   normalized_ = normalized;
  60   gl_stride_ = gl_stride;
  61   real_stride_ = real_stride;
  62   offset_ = offset;
  63   integer_ = integer;
  64 }
  65
  66 void VertexAttrib::Unbind(Buffer* buffer) {
  67   if (buffer_.get() == buffer) {
  68     buffer_ = NULL;
  69   }
  70 }
  71
  72 bool VertexAttrib::CanAccess(GLuint index) const {
  73   if (!enabled_) {
  74     return true;
  75   }
  76
  77   if (!buffer_.get() || buffer_->IsDeleted()) {
  78     return false;
  79   }
  80
  81   // The number of elements that can be accessed.
  82   GLsizeiptr buffer_size = buffer_->size();
  83   if (offset_ > buffer_size || real_stride_ == 0) {
  84     return false;
  85   }
  86
  87   uint32 usable_size = buffer_size - offset_;
  88   GLuint num_elements = usable_size / real_stride_ +
  89       ((usable_size % real_stride_) >=
  90        (GLES2Util::GetGLTypeSizeForTexturesAndBuffers(type_) * size_) ? 1 : 0);
  91   return index < num_elements;
  92 }
  93
  94 VertexAttribManager::VertexAttribManager()
  95     : num_fixed_attribs_(0),
  96       element_array_buffer_(NULL),
  97       manager_(NULL),
  98       deleted_(false),
  99       service_id_(0) {
 100 }
 101
 102 VertexAttribManager::VertexAttribManager(
 103     VertexArrayManager* manager, GLuint service_id, uint32 num_vertex_attribs)
 104     : num_fixed_attribs_(0),
 105       element_array_buffer_(NULL),
 106       manager_(manager),
 107       deleted_(false),
 108       service_id_(service_id) {
 109   manager_->StartTracking(this);
 110   Initialize(num_vertex_attribs, false);
 111 }
 112
 113 VertexAttribManager::~VertexAttribManager() {
 114   if (manager_) {
 115     if (manager_->have_context_) {
 116       if (service_id_ != 0)  // 0 indicates an emulated VAO
 117         glDeleteVertexArraysOES(1, &service_id_);
 118     }
 119     manager_->StopTracking(this);
 120     manager_ = NULL;
 121   }
 122 }
 123
 124 void VertexAttribManager::Initialize(
 125     uint32 max_vertex_attribs, bool init_attribs) {
 126   vertex_attribs_.resize(max_vertex_attribs);
 127
 128   for (uint32 vv = 0; vv < vertex_attribs_.size(); ++vv) {
 129     vertex_attribs_[vv].set_index(vv);
 130     vertex_attribs_[vv].SetList(&disabled_vertex_attribs_);
 131
 132     if (init_attribs) {
 133       glVertexAttrib4f(vv, 0.0f, 0.0f, 0.0f, 1.0f);
 134     }
 135   }
 136 }
 137
 138 void VertexAttribManager::SetElementArrayBuffer(Buffer* buffer) {
 139   element_array_buffer_ = buffer;
 140 }
 141
 142 bool VertexAttribManager::Enable(GLuint index, bool enable) {
 143   if (index >= vertex_attribs_.size()) {
 144     return false;
 145   }
 146   VertexAttrib& info = vertex_attribs_[index];
 147   if (info.enabled() != enable) {
 148     info.set_enabled(enable);
 149     info.SetList(enable ? &enabled_vertex_attribs_ : &disabled_vertex_attribs_);
 150   }
 151   return true;
 152 }
 153
 154 void VertexAttribManager::Unbind(Buffer* buffer) {
 155   if (element_array_buffer_.get() == buffer) {
 156     element_array_buffer_ = NULL;
 157   }
 158   for (uint32 vv = 0; vv < vertex_attribs_.size(); ++vv) {
 159     vertex_attribs_[vv].Unbind(buffer);
 160   }
 161 }
 162
 163 bool VertexAttribManager::ValidateBindings(
 164     const char* function_name,
 165     GLES2Decoder* decoder,
 166     FeatureInfo* feature_info,
 167     Program* current_program,
 168     GLuint max_vertex_accessed,
 169     bool instanced,
 170     GLsizei primcount) {
 171   DCHECK(primcount);
 172   ErrorState* error_state = decoder->GetErrorState();
 173   // true if any enabled, used divisor is zero
 174   bool divisor0 = false;
 175   bool have_enabled_active_attribs = false;
 176   const GLuint kInitialBufferId = 0xFFFFFFFFU;
 177   GLuint current_buffer_id = kInitialBufferId;
 178   bool use_client_side_arrays_for_stream_buffers = feature_info->workarounds(
 179       ).use_client_side_arrays_for_stream_buffers;
 180   // Validate all attribs currently enabled. If they are used by the current
 181   // program then check that they have enough elements to handle the draw call.
 182   // If they are not used by the current program check that they have a buffer
 183   // assigned.
 184   for (VertexAttribList::iterator it = enabled_vertex_attribs_.begin();
 185        it != enabled_vertex_attribs_.end(); ++it) {
 186     VertexAttrib* attrib = *it;
 187     const Program::VertexAttrib* attrib_info =
 188         current_program->GetAttribInfoByLocation(attrib->index());
 189     if (attrib_info) {
 190       divisor0 |= (attrib->divisor() == 0);
 191       have_enabled_active_attribs = true;
 192       GLuint count = attrib->MaxVertexAccessed(primcount, max_vertex_accessed);
 193       // This attrib is used in the current program.
 194       if (!attrib->CanAccess(count)) {
 195         ERRORSTATE_SET_GL_ERROR(
 196             error_state, GL_INVALID_OPERATION, function_name,
 197             (std::string(
 198                 "attempt to access out of range vertices in attribute ") +
 199              base::UintToString(attrib->index())).c_str());
 200         return false;
 201       }
 202       if (use_client_side_arrays_for_stream_buffers) {
 203         Buffer* buffer = attrib->buffer();
 204         glEnableVertexAttribArray(attrib->index());
 205         if (buffer->IsClientSideArray()) {
 206           if (current_buffer_id != 0) {
 207             current_buffer_id = 0;
 208             glBindBuffer(GL_ARRAY_BUFFER, 0);
 209           }
 210           attrib->set_is_client_side_array(true);
 211           const void* ptr = buffer->GetRange(attrib->offset(), 0);
 212           DCHECK(ptr);
 213           glVertexAttribPointer(
 214               attrib->index(),
 215               attrib->size(),
 216               attrib->type(),
 217               attrib->normalized(),
 218               attrib->gl_stride(),
 219               ptr);
 220         } else if (attrib->is_client_side_array()) {
 221           attrib->set_is_client_side_array(false);
 222           GLuint new_buffer_id = buffer->service_id();
 223           if (new_buffer_id != current_buffer_id) {
 224             current_buffer_id = new_buffer_id;
 225             glBindBuffer(GL_ARRAY_BUFFER, current_buffer_id);
 226           }
 227           const void* ptr = reinterpret_cast<const void*>(attrib->offset());
 228           glVertexAttribPointer(
 229               attrib->index(),
 230               attrib->size(),
 231               attrib->type(),
 232               attrib->normalized(),
 233               attrib->gl_stride(),
 234               ptr);
 235         }
 236       }
 237     } else {
 238       // This attrib is not used in the current program.
 239       if (!attrib->buffer()) {
 240         ERRORSTATE_SET_GL_ERROR(
 241             error_state, GL_INVALID_OPERATION, function_name,
 242             (std::string(
 243                  "attempt to render with no buffer attached to "
 244                  "enabled attribute ") +
 245                  base::UintToString(attrib->index())).c_str());
 246         return false;
 247       } else if (use_client_side_arrays_for_stream_buffers) {
 248         Buffer* buffer = attrib->buffer();
 249         // Disable client side arrays for unused attributes else we'll
 250         // read bad memory
 251         if (buffer->IsClientSideArray()) {
 252           // Don't disable attrib 0 since it's special.
 253           if (attrib->index() > 0) {
 254             glDisableVertexAttribArray(attrib->index());
 255           }
 256         }
 257       }
 258     }
 259   }
 260
 261   // Instanced drawing needs at least one enabled attribute with divisor zero.
 262   // Non-instanced drawing is fine with having no attributes at all, but if
 263   // there are attributes, at least one should have divisor zero.
 264   // (See ANGLE_instanced_arrays spec)
 265   if (!divisor0 && (instanced || have_enabled_active_attribs)) {
 266     ERRORSTATE_SET_GL_ERROR(
 267         error_state, GL_INVALID_OPERATION, function_name,
 268         "attempt to draw with all attributes having non-zero divisors");
 269     return false;
 270   }
 271
 272   if (current_buffer_id != kInitialBufferId) {
 273     // Restore the buffer binding.
 274     decoder->RestoreBufferBindings();
 275   }
 276
 277   return true;
 278 }
 279
 280 }  // namespace gles2
 281 }  // namespace gpu