/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "WebGLMemoryTracker.h"

#include "WebGLBuffer.h"
#include "WebGLContext.h"
#include "WebGLVertexAttribData.h"
#include "WebGLProgram.h"
#include "WebGLRenderbuffer.h"
#include "WebGLShader.h"
#include "WebGLTexture.h"
#include "WebGLUniformLocation.h"

namespace mozilla {

NS_IMETHODIMP
WebGLMemoryTracker::CollectReports(nsIHandleReportCallback* aHandleReport,
                                   nsISupports* aData, bool) {
  MOZ_COLLECT_REPORT(
      "webgl-texture-memory", KIND_OTHER, UNITS_BYTES, GetTextureMemoryUsed(),
      "Memory used by WebGL textures. The OpenGL implementation is free to "
      "store these textures in either video memory or main memory. This "
      "measurement is only a lower bound, actual memory usage may be higher "
      "for example if the storage is strided.");

  MOZ_COLLECT_REPORT("webgl-texture-count", KIND_OTHER, UNITS_COUNT,
                     GetTextureCount(), "Number of WebGL textures.");

  MOZ_COLLECT_REPORT(
      "webgl-buffer-memory", KIND_OTHER, UNITS_BYTES, GetBufferMemoryUsed(),
      "Memory used by WebGL buffers. The OpenGL implementation is free to "
      "store these buffers in either video memory or main memory. This "
      "measurement is only a lower bound, actual memory usage may be higher "
      "for example if the storage is strided.");

  MOZ_COLLECT_REPORT(
      "explicit/webgl/buffer-cache-memory", KIND_HEAP, UNITS_BYTES,
      GetBufferCacheMemoryUsed(),
      "Memory used by WebGL buffer caches. The WebGL implementation caches "
      "the contents of element array buffers only. This adds up with the "
      "'webgl-buffer-memory' value, but contrary to it, this one represents "
      "bytes on the heap, not managed by OpenGL.");

  MOZ_COLLECT_REPORT("webgl-buffer-count", KIND_OTHER, UNITS_COUNT,
                     GetBufferCount(), "Number of WebGL buffers.");

  MOZ_COLLECT_REPORT(
      "webgl-renderbuffer-memory", KIND_OTHER, UNITS_BYTES,
      GetRenderbufferMemoryUsed(),
      "Memory used by WebGL renderbuffers. The OpenGL implementation is free "
      "to store these renderbuffers in either video memory or main memory. "
      "This measurement is only a lower bound, actual memory usage may be "
      "higher, for example if the storage is strided.");

  MOZ_COLLECT_REPORT("webgl-renderbuffer-count", KIND_OTHER, UNITS_COUNT,
                     GetRenderbufferCount(), "Number of WebGL renderbuffers.");

  MOZ_COLLECT_REPORT(
      "explicit/webgl/shader", KIND_HEAP, UNITS_BYTES, GetShaderSize(),
      "Combined size of WebGL shader ASCII sources and translation logs "
      "cached on the heap.");

  MOZ_COLLECT_REPORT("webgl-shader-count", KIND_OTHER, UNITS_COUNT,
                     GetShaderCount(), "Number of WebGL shaders.");

  MOZ_COLLECT_REPORT("webgl-context-count", KIND_OTHER, UNITS_COUNT,
                     GetContextCount(), "Number of WebGL contexts.");

  return NS_OK;
}

NS_IMPL_ISUPPORTS(WebGLMemoryTracker, nsIMemoryReporter)

StaticRefPtr<WebGLMemoryTracker> WebGLMemoryTracker::sUniqueInstance;

WebGLMemoryTracker* WebGLMemoryTracker::UniqueInstance() {
  if (!sUniqueInstance) {
    sUniqueInstance = new WebGLMemoryTracker;
    sUniqueInstance->InitMemoryReporter();
  }
  return sUniqueInstance;
}

WebGLMemoryTracker::WebGLMemoryTracker() {}

void WebGLMemoryTracker::InitMemoryReporter() {
  RegisterWeakMemoryReporter(this);
}

WebGLMemoryTracker::~WebGLMemoryTracker() {
  UnregisterWeakMemoryReporter(this);
}

MOZ_DEFINE_MALLOC_SIZE_OF(WebGLBufferMallocSizeOf)

int64_t WebGLMemoryTracker::GetBufferCacheMemoryUsed() {
  const ContextsArrayType& contexts = Contexts();
  int64_t result = 0;
  for (size_t i = 0; i < contexts.Length(); ++i) {
    for (const WebGLBuffer* buffer = contexts[i]->mBuffers.getFirst(); buffer;
         buffer = buffer->getNext()) {
      if (buffer->Content() == WebGLBuffer::Kind::ElementArray) {
        result += buffer->SizeOfIncludingThis(WebGLBufferMallocSizeOf);
      }
    }
  }
  return result;
}

MOZ_DEFINE_MALLOC_SIZE_OF(WebGLShaderMallocSizeOf)

int64_t WebGLMemoryTracker::GetShaderSize() {
  const ContextsArrayType& contexts = Contexts();
  int64_t result = 0;
  for (size_t i = 0; i < contexts.Length(); ++i) {
    for (const WebGLShader* shader = contexts[i]->mShaders.getFirst(); shader;
         shader = shader->getNext()) {
      result += shader->SizeOfIncludingThis(WebGLShaderMallocSizeOf);
    }
  }
  return result;
}

/*static*/ int64_t WebGLMemoryTracker::GetTextureMemoryUsed() {
  const ContextsArrayType& contexts = Contexts();
  int64_t result = 0;
  for (size_t i = 0; i < contexts.Length(); ++i) {
    for (const WebGLTexture* texture = contexts[i]->mTextures.getFirst();
         texture; texture = texture->getNext()) {
      result += texture->MemoryUsage();
    }
  }
  return result;
}

/*static*/ int64_t WebGLMemoryTracker::GetTextureCount() {
  const ContextsArrayType& contexts = Contexts();
  int64_t result = 0;
  for (size_t i = 0; i < contexts.Length(); ++i) {
    for (const WebGLTexture* texture = contexts[i]->mTextures.getFirst();
         texture; texture = texture->getNext()) {
      result++;
    }
  }
  return result;
}

/*static*/ int64_t WebGLMemoryTracker::GetBufferMemoryUsed() {
  const ContextsArrayType& contexts = Contexts();
  int64_t result = 0;
  for (size_t i = 0; i < contexts.Length(); ++i) {
    for (const WebGLBuffer* buffer = contexts[i]->mBuffers.getFirst(); buffer;
         buffer = buffer->getNext()) {
      result += buffer->ByteLength();
    }
  }
  return result;
}

/*static*/ int64_t WebGLMemoryTracker::GetBufferCount() {
  const ContextsArrayType& contexts = Contexts();
  int64_t result = 0;
  for (size_t i = 0; i < contexts.Length(); ++i) {
    for (const WebGLBuffer* buffer = contexts[i]->mBuffers.getFirst(); buffer;
         buffer = buffer->getNext()) {
      result++;
    }
  }
  return result;
}

/*static*/ int64_t WebGLMemoryTracker::GetRenderbufferMemoryUsed() {
  const ContextsArrayType& contexts = Contexts();
  int64_t result = 0;
  for (size_t i = 0; i < contexts.Length(); ++i) {
    for (const WebGLRenderbuffer* rb = contexts[i]->mRenderbuffers.getFirst();
         rb; rb = rb->getNext()) {
      result += rb->MemoryUsage();
    }
  }
  return result;
}

/*static*/ int64_t WebGLMemoryTracker::GetRenderbufferCount() {
  const ContextsArrayType& contexts = Contexts();
  int64_t result = 0;
  for (size_t i = 0; i < contexts.Length(); ++i) {
    for (const WebGLRenderbuffer* rb = contexts[i]->mRenderbuffers.getFirst();
         rb; rb = rb->getNext()) {
      result++;
    }
  }
  return result;
}

/*static*/ int64_t WebGLMemoryTracker::GetShaderCount() {
  const ContextsArrayType& contexts = Contexts();
  int64_t result = 0;
  for (size_t i = 0; i < contexts.Length(); ++i) {
    for (const WebGLShader* shader = contexts[i]->mShaders.getFirst(); shader;
         shader = shader->getNext()) {
      result++;
    }
  }
  return result;
}

}  // namespace mozilla