command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index a2822fc7e4816cc7e4b4db4e180dbd0c6e3b23ef..b1a158af9dbfcb4fd39e4a255b84bc1bd7ce443e 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -48,6 +48,7 @@
 #include "gpu/command_buffer/service/image_manager.h"
 #include "gpu/command_buffer/service/mailbox_manager.h"
 #include "gpu/command_buffer/service/memory_tracking.h"
+#include "gpu/command_buffer/service/path_manager.h"
 #include "gpu/command_buffer/service/program_manager.h"
 #include "gpu/command_buffer/service/query_manager.h"
 #include "gpu/command_buffer/service/renderbuffer_manager.h"
@@ -739,6 +740,8 @@ class GLES2DecoderImpl : public GLES2Decoder,
   void DeleteQueriesEXTHelper(GLsizei n, const GLuint* client_ids);
   bool GenVertexArraysOESHelper(GLsizei n, const GLuint* client_ids);
   void DeleteVertexArraysOESHelper(GLsizei n, const GLuint* client_ids);
+  bool GenPathsCHROMIUMHelper(GLsizei range, const GLuint* client_ids);
+  void DeletePathsCHROMIUMHelper(GLuint path, GLsizei range);
 
   // Helper for async upload token completion notification callback.
   base::Closure AsyncUploadTokenCompletionClosure(uint32 async_upload_token,
@@ -764,6 +767,8 @@ class GLES2DecoderImpl : public GLES2Decoder,
     return group_->framebuffer_manager();
   }
 
+  PathManager* path_manager() { return group_->path_manager(); }
+
   ProgramManager* program_manager() {
     return group_->program_manager();
   }
@@ -828,6 +833,8 @@ class GLES2DecoderImpl : public GLES2Decoder,
     texture_manager()->RemoveTexture(client_id);
   }
 
+  GLuint GetPath(GLuint client_id, error::Error* path_error);
+
   // Get the size (in pixels) of the currently bound frame buffer (either FBO
   // or regular back buffer).
   gfx::Size GetBoundReadFrameBufferSize();
@@ -1628,6 +1635,16 @@ class GLES2DecoderImpl : public GLES2Decoder,
   void ProcessPendingReadPixels();
   void FinishReadPixels(const cmds::ReadPixels& c, GLuint buffer);
 
+  error::Error PrepareInstancedPathCommand(uint32 num_paths,
+                                           uint32 paths_shm_id,
+                                           uint32 paths_shm_offset,
+                                           GLuint path_base,
+                                           GLenum transform_type,
+                                           uint32 transforms_shm_id,
+                                           uint32 transforms_shm_offset,
+                                           GLuint** out_paths,
+                                           const GLfloat** out_transforms);
+
   // Generate a member function prototype for each command in an automated and
   // typesafe way.
   #define GLES2_CMD_OP(name) \
@@ -2758,6 +2775,14 @@ bool GLES2DecoderImpl::InitializeShaderTranslator() {
 #if (ANGLE_SH_VERSION >= 123)
     resources.EXT_shader_texture_lod =
         features().ext_shader_texture_lod ? 1 : 0;
+#if (ANGLE_SH_VERSION >= 124)
+    if (features().chromium_path_rendering) {
+      resources.CHROMIUM_path_rendering = 1;
+      GLint value = 0;
+      glGetIntegerv(GL_MAX_TEXTURE_COORDS, &value);
+      resources.MaxTextureCoords = value;
+    }
+#endif
 #endif
   }
 
@@ -2870,6 +2895,25 @@ bool GLES2DecoderImpl::GenTexturesHelper(GLsizei n, const GLuint* client_ids) {
   return true;
 }
 
+bool GLES2DecoderImpl::GenPathsCHROMIUMHelper(GLsizei range,
+                                              const GLuint* client_ids) {
+  for (GLsizei ii = 0; ii < range; ++ii) {
+    if (path_manager()->GetPath(client_ids[ii])) {
+      return false;
+    }
+  }
+
+  GLuint n = glGenPathsNV(range);
+  for (GLsizei ii = 0; ii < range; ++ii) {
+    path_manager()->CreatePath(client_ids[ii], n + ii);
+  }
+  return true;
+}
+
+void GLES2DecoderImpl::DeletePathsCHROMIUMHelper(GLuint path, GLsizei range) {
+  path_manager()->RemovePaths(path, range);
+}
+
 void GLES2DecoderImpl::DeleteBuffersHelper(
     GLsizei n, const GLuint* client_ids) {
   for (GLsizei ii = 0; ii < n; ++ii) {
@@ -4342,6 +4386,12 @@ bool GLES2DecoderImpl::GetHelper(
         params[0] = renderbuffer_manager()->max_renderbuffer_size();
       }
       return true;
+    case GL_MAX_TEXTURE_COORDS:
+      *num_written = 1;
+      if (params) {
+        glGetIntegerv(GL_MAX_TEXTURE_COORDS, params);
+      }
+      return true;
     case GL_MAX_TEXTURE_SIZE:
       *num_written = 1;
       if (params) {
@@ -10785,6 +10835,442 @@ void GLES2DecoderImpl::OnOutOfMemoryError() {
   }
 }
 
+GLuint GLES2DecoderImpl::GetPath(GLuint client_id, error::Error* path_error) {
+  GLuint service_id = 0;
+  // FIXME: currently we do not create paths if they are not present.
+  if (!path_manager()->GetPath(client_id, &service_id)) {
+    *path_error = error::kInvalidArguments;
+    return 0;
+  }
+  return service_id;
+}
+
+error::Error GLES2DecoderImpl::HandleGenPathsCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::GenPathsCHROMIUM& c) {
+  GLsizei range = static_cast<GLsizei>(c.range);
+  uint32 data_size;
+  if (!SafeMultiplyUint32(range, sizeof(GLuint), &data_size)) {
+    return error::kOutOfBounds;
+  }
+  GLuint* client_ids = GetSharedMemoryAs<GLuint*>(
+      c.client_ids_shm_id, c.client_ids_shm_offset, data_size);
+  if (client_ids == NULL) {
+    return error::kOutOfBounds;
+  }
+  if (!GenPathsCHROMIUMHelper(range, client_ids)) {
+    return error::kInvalidArguments;
+  }
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandlePathCommandsCHROMIUM(
+    uint32 immediate_data_size,
+    const cmds::PathCommandsCHROMIUM& c) {
+  error::Error path_error = error::kNoError;
+  GLuint service_id = GetPath(static_cast<GLuint>(c.path), &path_error);
+  if (path_error != error::kNoError) {
+    return path_error;
+  }
+
+  GLsizei numCommands = static_cast<GLsizei>(c.numCommands);
+  uint32 commands_shm_id = static_cast<uint32>(c.commands_shm_id);
+  uint32 commands_shm_offset = static_cast<uint32>(c.commands_shm_offset);
+
+  const GLubyte* commands = NULL;
+  if (commands_shm_id != 0 || commands_shm_offset != 0) {
+    commands = GetSharedMemoryAs<const GLubyte*>(
+        commands_shm_id, commands_shm_offset, numCommands);
+    if (!commands) {
+      return error::kOutOfBounds;
+    }
+  }
+
+  GLenum coordType = static_cast<GLenum>(c.coordType);
+  GLsizei numCoords = static_cast<GLsizei>(c.numCoords);
+  uint32 coords_shm_id = static_cast<uint32>(c.coords_shm_id);
+  uint32 coords_shm_offset = static_cast<uint32>(c.coords_shm_offset);
+  uint32 coords_size =
+      GLES2Util::GetGLTypeSizeForTexturesAndBuffers(coordType) * numCoords;
+
+  const void* coords = NULL;
+  if (coords_shm_id != 0 || coords_shm_offset != 0) {
+    coords = GetSharedMemoryAs<const void*>(
+        coords_shm_id, coords_shm_offset, coords_size);
+    if (!coords) {
+      return error::kOutOfBounds;
+    }
+  }
+
+  glPathCommandsNV(
+      service_id, numCommands, commands, numCoords, coordType, coords);
+
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandlePathParameterfCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::PathParameterfCHROMIUM& c) {
+  error::Error path_error = error::kNoError;
+  GLuint service_id = GetPath(static_cast<GLuint>(c.path), &path_error);
+  if (path_error != error::kNoError) {
+    return path_error;
+  }
+  GLenum pname = static_cast<GLenum>(c.pname);
+  GLfloat value = static_cast<GLfloat>(c.value);
+  glPathParameterfNV(service_id, pname, value);
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandlePathParameteriCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::PathParameteriCHROMIUM& c) {
+  error::Error path_error = error::kNoError;
+  GLuint service_id = GetPath(static_cast<GLuint>(c.path), &path_error);
+  if (path_error != error::kNoError) {
+    return path_error;
+  }
+  GLenum pname = static_cast<GLenum>(c.pname);
+  GLint value = static_cast<GLint>(c.value);
+  glPathParameteriNV(service_id, pname, value);
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandleStencilFillPathCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::StencilFillPathCHROMIUM& c) {
+  error::Error path_error = error::kNoError;
+  GLuint service_id = GetPath(static_cast<GLuint>(c.path), &path_error);
+  if (path_error != error::kNoError) {
+    return path_error;
+  }
+  GLenum fillMode = static_cast<GLenum>(c.fillMode);
+  GLuint mask = static_cast<GLuint>(c.mask);
+  ApplyDirtyState();
+  glStencilFillPathNV(service_id, fillMode, mask);
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::PrepareInstancedPathCommand(
+    uint32 num_paths,
+    uint32 paths_shm_id,
+    uint32 paths_shm_offset,
+    GLuint path_base,
+    GLenum transform_type,
+    uint32 transforms_shm_id,
+    uint32 transforms_shm_offset,
+    GLuint** out_paths,
+    const GLfloat** out_transforms) {
+  GLuint* paths = NULL;
+  if (paths_shm_id != 0 || paths_shm_offset != 0) {
+    paths = GetSharedMemoryAs<GLuint*>(
+        paths_shm_id, paths_shm_offset, sizeof(GLuint) * num_paths);
+  }
+  if (!paths) {
+    return error::kOutOfBounds;
+  }
+
+  uint32 num_transform_elements =
+      GLES2Util::GetComponentCountForGLTransformType(transform_type) *
+      num_paths;
+
+  const GLfloat* transforms = NULL;
+  if (transforms_shm_id != 0 || transforms_shm_offset != 0) {
+    transforms = GetSharedMemoryAs<const GLfloat*>(
+        transforms_shm_id,
+        transforms_shm_offset,
+        sizeof(GLfloat) * num_transform_elements);
+  }
+  if (!transforms) {
+    return error::kOutOfBounds;
+  }
+
+  for (uint32_t i = 0; i < num_paths; ++i) {
+    error::Error path_error;
+    GLuint service_id = GetPath(paths[i] + path_base, &path_error);
+    // Will use path 0 if the path is not found. This is in line
+    // of the spec: missing paths will produce nothing, but does
+    // not stop the instanced draw.
+    paths[i] = service_id;
+  }
+
+  DCHECK((reinterpret_cast<uintptr_t>(paths) & 0x3) == 0);
+  DCHECK((reinterpret_cast<uintptr_t>(transforms) & 0x3) == 0);
+
+  *out_paths = paths;
+  *out_transforms = transforms;
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandleStencilFillPathInstancedCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::StencilFillPathInstancedCHROMIUM& c) {
+  TRACE_EVENT0("gpu",
+               "GLES2DecoderImpl::HandleStencilFillPathInstancedCHROMIUM");
+
+  GLsizei numPaths = static_cast<GLsizei>(c.numPaths);
+  GLenum pathNameType = static_cast<GLenum>(c.pathNameType);
+  uint32 paths_shm_id = static_cast<uint32>(c.paths_shm_id);
+  uint32 paths_shm_offset = static_cast<uint32>(c.paths_shm_offset);
+  GLuint pathBase = static_cast<GLuint>(c.pathBase);
+  GLenum fillMode = static_cast<GLenum>(c.fillMode);
+  GLuint mask = static_cast<GLuint>(c.mask);
+  GLenum transformType = static_cast<GLenum>(c.transformType);
+  uint32 transforms_shm_id = static_cast<uint32>(c.transformValues_shm_id);
+  uint32 transforms_shm_offset =
+      static_cast<uint32>(c.transformValues_shm_offset);
+
+  DCHECK(pathNameType == GL_UNSIGNED_INT);
+
+  GLuint* paths;
+  const GLfloat* transforms;
+
+  error::Error prepare_error =
+      PrepareInstancedPathCommand(static_cast<uint32_t>(numPaths),
+                                  paths_shm_id,
+                                  paths_shm_offset,
+                                  pathBase,
+                                  transformType,
+                                  transforms_shm_id,
+                                  transforms_shm_offset,
+                                  &paths,
+                                  &transforms);
+
+  if (prepare_error != error::kNoError) {
+    return prepare_error;
+  }
+
+  ApplyDirtyState();
+  glStencilFillPathInstancedNV(numPaths,
+                               GL_UNSIGNED_INT,
+                               paths,
+                               0,
+                               fillMode,
+                               mask,
+                               transformType,
+                               transforms);
+
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandleStencilStrokePathCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::StencilStrokePathCHROMIUM& c) {
+  error::Error path_error = error::kNoError;
+  GLuint service_id = GetPath(static_cast<GLuint>(c.path), &path_error);
+  if (path_error != error::kNoError) {
+    return path_error;
+  }
+  GLint reference = static_cast<GLint>(c.reference);
+  GLuint mask = static_cast<GLuint>(c.mask);
+  ApplyDirtyState();
+  glStencilStrokePathNV(service_id, reference, mask);
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandleStencilStrokePathInstancedCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::StencilStrokePathInstancedCHROMIUM& c) {
+  TRACE_EVENT0("gpu",
+               "GLES2DecoderImpl::HandleStencilStrokePathInstancedCHROMIUM");
+
+  GLsizei numPaths = static_cast<GLsizei>(c.numPaths);
+  GLenum pathNameType = static_cast<GLenum>(c.pathNameType);
+  uint32 paths_shm_id = static_cast<uint32>(c.paths_shm_id);
+  uint32 paths_shm_offset = static_cast<uint32>(c.paths_shm_offset);
+  GLuint pathBase = static_cast<GLuint>(c.pathBase);
+  GLuint ref = static_cast<GLuint>(c.ref);
+  GLuint mask = static_cast<GLuint>(c.mask);
+  GLenum transformType = static_cast<GLenum>(c.transformType);
+  uint32 transforms_shm_id = static_cast<uint32>(c.transformValues_shm_id);
+  uint32 transforms_shm_offset =
+      static_cast<uint32>(c.transformValues_shm_offset);
+
+  DCHECK(pathNameType == GL_UNSIGNED_INT);
+
+  GLuint* paths;
+  const GLfloat* transforms;
+
+  error::Error prepare_error =
+      PrepareInstancedPathCommand(static_cast<uint32_t>(numPaths),
+                                  paths_shm_id,
+                                  paths_shm_offset,
+                                  pathBase,
+                                  transformType,
+                                  transforms_shm_id,
+                                  transforms_shm_offset,
+                                  &paths,
+                                  &transforms);
+
+  if (prepare_error != error::kNoError) {
+    return prepare_error;
+  }
+
+  ApplyDirtyState();
+  glStencilStrokePathInstancedNV(numPaths,
+                                 GL_UNSIGNED_INT,
+                                 paths,
+                                 0,
+                                 ref,
+                                 mask,
+                                 transformType,
+                                 transforms);
+
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandlePathTexGenCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::PathTexGenCHROMIUM& c) {
+  TRACE_EVENT0("gpu", "GLES2DecoderImpl::HandlePathTexGenCHROMIUM");
+  GLenum texCoordSet = static_cast<GLenum>(c.texCoordSet);
+  GLenum genMode = static_cast<GLenum>(c.genMode);
+  GLint components = static_cast<GLint>(c.components);
+  uint32 buffer_shm_id = static_cast<uint32>(c.coeffs_shm_id);
+  uint32 buffer_shm_offset = static_cast<uint32>(c.coeffs_shm_offset);
+
+  uint32 coeffs_size =
+      sizeof(GLfloat) * components * (genMode == GL_EYE_LINEAR ? 4 : 3);
+
+  if (coeffs_size < 0) {
+    return error::kOutOfBounds;
+  }
+  const GLfloat* coeffs = NULL;
+  if (buffer_shm_id != 0 || buffer_shm_offset != 0) {
+    coeffs = GetSharedMemoryAs<const GLfloat*>(
+        buffer_shm_id, buffer_shm_offset, coeffs_size);
+    if (!coeffs) {
+      return error::kOutOfBounds;
+    }
+  }
+  glPathTexGenNV(texCoordSet, genMode, components, coeffs);
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandleCoverFillPathCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::CoverFillPathCHROMIUM& c) {
+  error::Error path_error = error::kNoError;
+  GLuint service_id = GetPath(static_cast<GLuint>(c.path), &path_error);
+  if (path_error != error::kNoError) {
+    return path_error;
+  }
+  GLenum coverMode = static_cast<GLenum>(c.coverMode);
+  ApplyDirtyState();
+  glCoverFillPathNV(service_id, coverMode);
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandleCoverFillPathInstancedCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::CoverFillPathInstancedCHROMIUM& c) {
+  TRACE_EVENT0("gpu", "GLES2DecoderImpl::HandleCoverFillPathInstancedCHROMIUM");
+
+  GLsizei numPaths = static_cast<GLsizei>(c.numPaths);
+  GLenum pathNameType = static_cast<GLenum>(c.pathNameType);
+  uint32 paths_shm_id = static_cast<uint32>(c.paths_shm_id);
+  uint32 paths_shm_offset = static_cast<uint32>(c.paths_shm_offset);
+  GLuint pathBase = static_cast<GLuint>(c.pathBase);
+  GLenum coverMode = static_cast<GLuint>(c.coverMode);
+  GLenum transformType = static_cast<GLenum>(c.transformType);
+  uint32 transforms_shm_id = static_cast<uint32>(c.transformValues_shm_id);
+  uint32 transforms_shm_offset =
+      static_cast<uint32>(c.transformValues_shm_offset);
+
+  DCHECK(pathNameType == GL_UNSIGNED_INT);
+
+  GLuint* paths;
+  const GLfloat* transforms;
+
+  error::Error prepare_error =
+      PrepareInstancedPathCommand(static_cast<uint32_t>(numPaths),
+                                  paths_shm_id,
+                                  paths_shm_offset,
+                                  pathBase,
+                                  transformType,
+                                  transforms_shm_id,
+                                  transforms_shm_offset,
+                                  &paths,
+                                  &transforms);
+
+  if (prepare_error != error::kNoError) {
+    return prepare_error;
+  }
+
+  ApplyDirtyState();
+  glCoverFillPathInstancedNV(numPaths,
+                             GL_UNSIGNED_INT,
+                             paths,
+                             0,
+                             coverMode,
+                             transformType,
+                             transforms);
+
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandleCoverStrokePathCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::CoverStrokePathCHROMIUM& c) {
+  error::Error path_error = error::kNoError;
+  GLuint service_id = GetPath(static_cast<GLuint>(c.path), &path_error);
+  if (path_error != error::kNoError) {
+    return path_error;
+  }
+  GLenum coverMode = static_cast<GLenum>(c.coverMode);
+  ApplyDirtyState();
+  glCoverStrokePathNV(service_id, coverMode);
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandleCoverStrokePathInstancedCHROMIUM(
+    uint32 immediate_data_size,
+    const gles2::cmds::CoverStrokePathInstancedCHROMIUM& c) {
+  TRACE_EVENT0("gpu",
+               "GLES2DecoderImpl::HandleCoverStrokePathInstancedCHROMIUM");
+
+  GLsizei numPaths = static_cast<GLsizei>(c.numPaths);
+  GLenum pathNameType = static_cast<GLenum>(c.pathNameType);
+  uint32 paths_shm_id = static_cast<uint32>(c.paths_shm_id);
+  uint32 paths_shm_offset = static_cast<uint32>(c.paths_shm_offset);
+  GLuint pathBase = static_cast<GLuint>(c.pathBase);
+  GLenum coverMode = static_cast<GLuint>(c.coverMode);
+  GLenum transformType = static_cast<GLenum>(c.transformType);
+  uint32 transforms_shm_id = static_cast<uint32>(c.transformValues_shm_id);
+  uint32 transforms_shm_offset =
+      static_cast<uint32>(c.transformValues_shm_offset);
+
+  DCHECK(pathNameType == GL_UNSIGNED_INT);
+
+  GLuint* paths;
+  const GLfloat* transforms;
+
+  error::Error prepare_error =
+      PrepareInstancedPathCommand(static_cast<uint32_t>(numPaths),
+                                  paths_shm_id,
+                                  paths_shm_offset,
+                                  pathBase,
+                                  transformType,
+                                  transforms_shm_id,
+                                  transforms_shm_offset,
+                                  &paths,
+                                  &transforms);
+
+  if (prepare_error != error::kNoError) {
+    return prepare_error;
+  }
+
+  ApplyDirtyState();
+  glCoverStrokePathInstancedNV(numPaths,
+                               GL_UNSIGNED_INT,
+                               paths,
+                               0,
+                               coverMode,
+                               transformType,
+                               transforms);
+  return error::kNoError;
+}
+
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.