gpu/command_buffer/common/gles2_cmd_format.h

   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 // This file defines the GLES2 command buffer commands.
   6
   7 #ifndef GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_
   8 #define GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_
   9
  10
  11 #include <KHR/khrplatform.h>
  12
  13 #include <stdint.h>
  14 #include <string.h>
  15
  16 #include "base/atomicops.h"
  17 #include "base/logging.h"
  18 #include "base/macros.h"
  19 #include "gpu/command_buffer/common/bitfield_helpers.h"
  20 #include "gpu/command_buffer/common/cmd_buffer_common.h"
  21 #include "gpu/command_buffer/common/gles2_cmd_ids.h"
  22
  23 // GL types are forward declared to avoid including the GL headers. The problem
  24 // is determining which GL headers to include from code that is common to the
  25 // client and service sides (GLES2 or one of several GL implementations).
  26 typedef unsigned int GLenum;
  27 typedef unsigned int GLbitfield;
  28 typedef unsigned int GLuint;
  29 typedef int GLint;
  30 typedef int GLsizei;
  31 typedef unsigned char GLboolean;
  32 typedef signed char GLbyte;
  33 typedef short GLshort;
  34 typedef unsigned char GLubyte;
  35 typedef unsigned short GLushort;
  36 typedef unsigned long GLulong;
  37 typedef float GLfloat;
  38 typedef float GLclampf;
  39 typedef double GLdouble;
  40 typedef double GLclampd;
  41 typedef void GLvoid;
  42 typedef khronos_intptr_t GLintptr;
  43 typedef khronos_ssize_t  GLsizeiptr;
  44
  45 namespace gpu {
  46 namespace gles2 {
  47
  48 // Command buffer is GPU_COMMAND_BUFFER_ENTRY_ALIGNMENT byte aligned.
  49 #pragma pack(push, GPU_COMMAND_BUFFER_ENTRY_ALIGNMENT)
  50
  51 namespace id_namespaces {
  52
  53 // These are used when contexts share resources.
  54 enum IdNamespaces {
  55   kBuffers,
  56   kFramebuffers,
  57   kProgramsAndShaders,
  58   kRenderbuffers,
  59   kTextures,
  60   kQueries,
  61   kVertexArrays,
  62   kNumIdNamespaces
  63 };
  64
  65 // These numbers must not change
  66 COMPILE_ASSERT(kBuffers == 0, kBuffers_is_not_0);
  67 COMPILE_ASSERT(kFramebuffers == 1, kFramebuffers_is_not_1);
  68 COMPILE_ASSERT(kProgramsAndShaders == 2, kProgramsAndShaders_is_not_2);
  69 COMPILE_ASSERT(kRenderbuffers == 3, kRenderbuffers_is_not_3);
  70 COMPILE_ASSERT(kTextures == 4, kTextures_is_not_4);
  71
  72 }  // namespace id_namespaces
  73
  74 // Used for some glGetXXX commands that return a result through a pointer. We
  75 // need to know if the command succeeded or not and the size of the result. If
  76 // the command failed its result size will 0.
  77 template <typename T>
  78 struct SizedResult {
  79   typedef T Type;
  80
  81   T* GetData() {
  82     return static_cast<T*>(static_cast<void*>(&data));
  83   }
  84
  85   // Returns the total size in bytes of the SizedResult for a given number of
  86   // results including the size field.
  87   static size_t ComputeSize(size_t num_results) {
  88     return sizeof(T) * num_results + sizeof(uint32_t);  // NOLINT
  89   }
  90
  91   // Returns the total size in bytes of the SizedResult for a given size of
  92   // results.
  93   static size_t ComputeSizeFromBytes(size_t size_of_result_in_bytes) {
  94     return size_of_result_in_bytes + sizeof(uint32_t);  // NOLINT
  95   }
  96
  97   // Returns the maximum number of results for a given buffer size.
  98   static uint32_t ComputeMaxResults(size_t size_of_buffer) {
  99     return (size_of_buffer >= sizeof(uint32_t)) ?
 100         ((size_of_buffer - sizeof(uint32_t)) / sizeof(T)) : 0;  // NOLINT
 101   }
 102
 103   // Set the size for a given number of results.
 104   void SetNumResults(size_t num_results) {
 105     size = sizeof(T) * num_results;  // NOLINT
 106   }
 107
 108   // Get the number of elements in the result
 109   int32_t GetNumResults() const {
 110     return size / sizeof(T);  // NOLINT
 111   }
 112
 113   // Copy the result.
 114   void CopyResult(void* dst) const {
 115     memcpy(dst, &data, size);
 116   }
 117
 118   uint32_t size;  // in bytes.
 119   int32_t data;  // this is just here to get an offset.
 120 };
 121
 122 COMPILE_ASSERT(sizeof(SizedResult<int8_t>) == 8, SizedResult_size_not_8);
 123 COMPILE_ASSERT(offsetof(SizedResult<int8_t>, size) == 0,
 124                OffsetOf_SizedResult_size_not_0);
 125 COMPILE_ASSERT(offsetof(SizedResult<int8_t>, data) == 4,
 126                OffsetOf_SizedResult_data_not_4);
 127
 128 // The data for one attrib or uniform from GetProgramInfoCHROMIUM.
 129 struct ProgramInput {
 130   uint32_t type;             // The type (GL_VEC3, GL_MAT3, GL_SAMPLER_2D, etc.
 131   int32_t size;              // The size (how big the array is for uniforms)
 132   uint32_t location_offset;  // offset from ProgramInfoHeader to 'size'
 133                              // locations for uniforms, 1 for attribs.
 134   uint32_t name_offset;      // offset from ProgrmaInfoHeader to start of name.
 135   uint32_t name_length;      // length of the name.
 136 };
 137
 138 // The format of the bucket filled out by GetProgramInfoCHROMIUM
 139 struct ProgramInfoHeader {
 140   uint32_t link_status;
 141   uint32_t num_attribs;
 142   uint32_t num_uniforms;
 143   // ProgramInput inputs[num_attribs + num_uniforms];
 144 };
 145
 146 // The format of QuerySync used by EXT_occlusion_query_boolean
 147 struct QuerySync {
 148   void Reset() {
 149     process_count = 0;
 150     result = 0;
 151   }
 152
 153   base::subtle::Atomic32 process_count;
 154   uint64_t result;
 155 };
 156
 157 struct AsyncUploadSync {
 158   void Reset() {
 159     base::subtle::Release_Store(&async_upload_token, 0);
 160   }
 161
 162   void SetAsyncUploadToken(uint32_t token) {
 163     DCHECK_NE(token, 0u);
 164     base::subtle::Release_Store(&async_upload_token, token);
 165   }
 166
 167   bool HasAsyncUploadTokenPassed(uint32_t token) {
 168     DCHECK_NE(token, 0u);
 169     uint32_t current_token = base::subtle::Acquire_Load(&async_upload_token);
 170     return (current_token - token < 0x80000000);
 171   }
 172
 173   base::subtle::Atomic32 async_upload_token;
 174 };
 175
 176 COMPILE_ASSERT(sizeof(ProgramInput) == 20, ProgramInput_size_not_20);
 177 COMPILE_ASSERT(offsetof(ProgramInput, type) == 0,
 178                OffsetOf_ProgramInput_type_not_0);
 179 COMPILE_ASSERT(offsetof(ProgramInput, size) == 4,
 180                OffsetOf_ProgramInput_size_not_4);
 181 COMPILE_ASSERT(offsetof(ProgramInput, location_offset) == 8,
 182                OffsetOf_ProgramInput_location_offset_not_8);
 183 COMPILE_ASSERT(offsetof(ProgramInput, name_offset) == 12,
 184                OffsetOf_ProgramInput_name_offset_not_12);
 185 COMPILE_ASSERT(offsetof(ProgramInput, name_length) == 16,
 186                OffsetOf_ProgramInput_name_length_not_16);
 187
 188 COMPILE_ASSERT(sizeof(ProgramInfoHeader) == 12, ProgramInfoHeader_size_not_12);
 189 COMPILE_ASSERT(offsetof(ProgramInfoHeader, link_status) == 0,
 190                OffsetOf_ProgramInfoHeader_link_status_not_0);
 191 COMPILE_ASSERT(offsetof(ProgramInfoHeader, num_attribs) == 4,
 192                OffsetOf_ProgramInfoHeader_num_attribs_not_4);
 193 COMPILE_ASSERT(offsetof(ProgramInfoHeader, num_uniforms) == 8,
 194                OffsetOf_ProgramInfoHeader_num_uniforms_not_8);
 195
 196 namespace cmds {
 197
 198 #include "../common/gles2_cmd_format_autogen.h"
 199
 200 // These are hand written commands.
 201 // TODO(gman): Attempt to make these auto-generated.
 202
 203 struct GenMailboxCHROMIUM {
 204   typedef GenMailboxCHROMIUM ValueType;
 205   static const CommandId kCmdId = kGenMailboxCHROMIUM;
 206   static const cmd::ArgFlags kArgFlags = cmd::kFixed;
 207   static const uint8 cmd_flags = CMD_FLAG_SET_TRACE_LEVEL(3);
 208   CommandHeader header;
 209 };
 210
 211 struct InsertSyncPointCHROMIUM {
 212   typedef InsertSyncPointCHROMIUM ValueType;
 213   static const CommandId kCmdId = kInsertSyncPointCHROMIUM;
 214   static const cmd::ArgFlags kArgFlags = cmd::kFixed;
 215   static const uint8 cmd_flags = CMD_FLAG_SET_TRACE_LEVEL(3);
 216   CommandHeader header;
 217 };
 218
 219 struct CreateAndConsumeTextureCHROMIUMImmediate {
 220   typedef CreateAndConsumeTextureCHROMIUMImmediate ValueType;
 221   static const CommandId kCmdId = kCreateAndConsumeTextureCHROMIUMImmediate;
 222   static const cmd::ArgFlags kArgFlags = cmd::kAtLeastN;
 223   static const uint8 cmd_flags = CMD_FLAG_SET_TRACE_LEVEL(1);
 224
 225   static uint32_t ComputeDataSize() {
 226     return static_cast<uint32_t>(sizeof(GLbyte) * 64);  // NOLINT
 227   }
 228
 229   static uint32_t ComputeSize() {
 230     return static_cast<uint32_t>(sizeof(ValueType) +
 231                                  ComputeDataSize());  // NOLINT
 232   }
 233
 234   void SetHeader(uint32_t size_in_bytes) {
 235     header.SetCmdByTotalSize<ValueType>(size_in_bytes);
 236   }
 237
 238   void Init(GLenum _target, uint32_t _client_id, const GLbyte* _mailbox) {
 239     SetHeader(ComputeSize());
 240     target = _target;
 241     client_id = _client_id;
 242     memcpy(ImmediateDataAddress(this), _mailbox, ComputeDataSize());
 243   }
 244
 245   void* Set(void* cmd,
 246             GLenum _target,
 247             uint32_t _client_id,
 248             const GLbyte* _mailbox) {
 249     static_cast<ValueType*>(cmd)->Init(_target, _client_id, _mailbox);
 250     const uint32_t size = ComputeSize();
 251     return NextImmediateCmdAddressTotalSize<ValueType>(cmd, size);
 252   }
 253
 254   gpu::CommandHeader header;
 255   uint32_t target;
 256   uint32_t client_id;
 257 };
 258
 259 COMPILE_ASSERT(sizeof(CreateAndConsumeTextureCHROMIUMImmediate) == 12,
 260                Sizeof_CreateAndConsumeTextureCHROMIUMImmediate_is_not_12);
 261 COMPILE_ASSERT(offsetof(CreateAndConsumeTextureCHROMIUMImmediate, header) == 0,
 262                OffsetOf_CreateAndConsumeTextureCHROMIUMImmediate_header_not_0);
 263 COMPILE_ASSERT(offsetof(CreateAndConsumeTextureCHROMIUMImmediate, target) == 4,
 264                OffsetOf_CreateAndConsumeTextureCHROMIUMImmediate_target_not_4);
 265 COMPILE_ASSERT(
 266     offsetof(CreateAndConsumeTextureCHROMIUMImmediate, client_id) == 8,
 267     OffsetOf_CreateAndConsumeTextureCHROMIUMImmediate_client_id_not_8);
 268
 269
 270 #pragma pack(pop)
 271
 272 }  // namespace cmd
 273 }  // namespace gles2
 274 }  // namespace gpu
 275
 276 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_