Revert 98706 - Initial checkin of the compositor_model_bench tool

gpu/tools/compositor_model_bench/render_model_utils.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Whole-tree processing that's likely to be helpful in multiple render models.
-
-#include "gpu/tools/compositor_model_bench/render_model_utils.h"
-
-#include <cstdlib>
-#include <map>
-#include <set>
-#include <vector>
-
-#include "base/logging.h"
-
-TextureGenerator::TextureGenerator(RenderNode* root)
-    : stage_(DiscoveryStage),
-      tex_ids_(NULL),
-      image_data_(NULL),
-      images_generated_(0) {
-  DiscoverInputIDs(root);
-  GenerateGLTexIDs();
-  AssignIDMapping();
-  WriteOutNewIDs(root);
-  AllocateImageArray();
-  BuildTextureImages(root);
-}
-
-TextureGenerator::~TextureGenerator() OVERRIDE {
-  if (tex_ids_.get()) {
-    glDeleteTextures(discovered_ids_.size(), tex_ids_.get());
-  }
-}
-
-void TextureGenerator::BeginVisitRenderNode(RenderNode* node) OVERRIDE {
-  for (size_t n = 0; n < node->num_tiles(); ++n) {
-    Tile* i = node->tile(n);
-    HandleTexture(&i->texID,
-                  node->tile_width(),
-                  node->tile_height(),
-                  GL_RGBA);
-  }
-}
-
-void TextureGenerator::BeginVisitCCNode(CCNode* node) OVERRIDE {
-  for (size_t n = 0; n < node->num_textures(); ++n) {
-    Texture* i = node->texture(n);
-    HandleTexture(&i->texID, i->width, i->height, i->format);
-  }
-  BeginVisitRenderNode(node);
-}
-
-void TextureGenerator::DiscoverInputIDs(RenderNode* root) {
-  // Pass 1: see which texture ID's have been used.
-  stage_ = DiscoveryStage;
-  root->Accept(this);
-}
-
-void TextureGenerator::GenerateGLTexIDs() {
-  int numTextures = discovered_ids_.size();
-  tex_ids_.reset(new GLuint[numTextures]);
-  glGenTextures(numTextures, tex_ids_.get());
-}
-
-void TextureGenerator::AssignIDMapping() {
-  // In the original version of this code the assigned ID's were not
-  // GL tex ID's, but newly generated consecutive ID's that indexed
-  // into an array of GL tex ID's. There's no need for this and now
-  // I'm instead generating the GL tex ID's upfront and assigning
-  // *those* in the remapping -- this more accurately reflects the
-  // behavior in Chromium, and it also takes out some design
-  // complexity that came from the extra layer of indirection.
-  // HOWEVER -- when I was assigning my own ID's before, I did some
-  // clever tricks to make sure the assignation was idempotent.
-  // Instead of going to even more clever lengths to preserve that
-  // property, I now just assume that the visitor will encounter each
-  // node (and consequently each texture) exactly once during a
-  // traversal of the tree -- this shouldn't be a hard guarantee
-  // to make.
-  int j = 0;
-  typedef std::set<int>::iterator id_itr;
-  for (id_itr i = discovered_ids_.begin();
-       i != discovered_ids_.end();
-       ++i, ++j) {
-    remapped_ids_[*i] = tex_ids_[j];
-  }
-}
-
-void TextureGenerator::WriteOutNewIDs(RenderNode* root) {
-  // Pass 2: write the new texture ID's back into the texture objects.
-  stage_ = RemappingStage;
-  root->Accept(this);
-}
-
-void TextureGenerator::AllocateImageArray() {
-  image_data_.reset(new ImagePtr[discovered_ids_.size()]);
-  images_generated_ = 0;
-}
-
-void TextureGenerator::BuildTextureImages(RenderNode* root) {
-  // Pass 3: use the texture metadata to generate images for the
-  // textures, and set up the textures for use by OpenGL. This
-  // doesn't *have* to be a separate pass (it could be rolled
-  // into pass 2) but I think this is more clear and performance
-  // shouldn't be bad.
-  stage_ = ImageGenerationStage;
-  root->Accept(this);
-}
-
-void TextureGenerator::HandleTexture(int* texID,
-                                     int width,
-                                     int height,
-                                     GLenum format) {
-  if (*texID == -1)
-    return;    // -1 means it's not a real texture.
-  switch (stage_) {
-    case DiscoveryStage:
-      discovered_ids_.insert(*texID);
-      break;
-    case RemappingStage:
-      *texID = remapped_ids_[*texID];
-      break;
-    case ImageGenerationStage:
-      // Only handle this one if we haven't already built a
-      // texture for its ID.
-      if (ids_for_completed_textures_.count(*texID))
-        return;
-      GenerateImageForTexture(*texID, width, height, format);
-      ids_for_completed_textures_.insert(*texID);
-      break;
-  }
-}
-
-void TextureGenerator::GenerateImageForTexture(int texID,
-                                               int width,
-                                               int height,
-                                               GLenum format) {
-  int bytes_per_pixel = FormatBytesPerPixel(format);
-  DCHECK_LE(bytes_per_pixel, 4);
-  int imgID = images_generated_++;
-  image_data_[imgID].reset(new uint8[width*height*bytes_per_pixel]);
-  // Pick random colors to use for this texture.
-  uint8 random_color[4];
-  for (int c = 0; c < 4; ++c) {
-    random_color[c] = std::rand() % 255;
-  }
-  // Create the image from those colors.
-  for (int x = 0; x < width; ++x) {
-    for (int y = 0; y < height; ++y) {
-      int pix_addr = (y * width + x) * bytes_per_pixel;
-      for (int c = 0; c < bytes_per_pixel; ++c) {
-        bool on = ((x/8) + (y/8)) % 2;
-        uint8 v = on ? random_color[c] : ~random_color[c];
-        (image_data_[imgID])[pix_addr + c] = v;
-      }
-      if (bytes_per_pixel == 4) {    // Randomize alpha.
-        image_data_[imgID][pix_addr + 3] = std::rand() % 255;
-      }
-    }
-  }
-  // Set up GL texture.
-  glBindTexture(GL_TEXTURE_2D, texID);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glPixelStorei(GL_PACK_ALIGNMENT, 1);
-  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-  glTexImage2D(GL_TEXTURE_2D,
-               0,
-               format,
-               width, height,
-               0,
-               format,
-               GL_UNSIGNED_BYTE,
-               image_data_[imgID].get());
-}
-