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// Copyright (c) 2010 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.
#include "gpu/command_buffer/service/texture_manager.h"
#include "base/bits.h"
namespace gpu {
namespace gles2 {
static GLsizei ComputeMipMapCount(
GLsizei width, GLsizei height, GLsizei depth) {
return 1 + base::bits::Log2Floor(std::max(std::max(width, height), depth));
}
static size_t GLTargetToFaceIndex(GLenum target) {
switch (target) {
case GL_TEXTURE_2D:
return 0;
case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
return 0;
case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
return 1;
case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
return 2;
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
return 3;
case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
return 4;
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
return 5;
default:
NOTREACHED();
return 0;
}
}
static size_t FaceIndexToGLTarget(size_t index) {
switch (index) {
case 0:
return GL_TEXTURE_CUBE_MAP_POSITIVE_X;
case 1:
return GL_TEXTURE_CUBE_MAP_NEGATIVE_X;
case 2:
return GL_TEXTURE_CUBE_MAP_POSITIVE_Y;
case 3:
return GL_TEXTURE_CUBE_MAP_NEGATIVE_Y;
case 4:
return GL_TEXTURE_CUBE_MAP_POSITIVE_Z;
case 5:
return GL_TEXTURE_CUBE_MAP_NEGATIVE_Z;
default:
NOTREACHED();
return 0;
}
}
void TextureManager::TextureInfo::MarkMipmapsGenerated() {
DCHECK(CanGenerateMipmaps());
for (size_t ii = 0; ii < level_infos_.size(); ++ii) {
const TextureInfo::LevelInfo& info1 = level_infos_[ii][0];
GLsizei width = info1.width;
GLsizei height = info1.height;
GLsizei depth = info1.depth;
int num_mips = ComputeMipMapCount(width, height, depth);
for (int level = 1; level < num_mips; ++level) {
width = std::max(1, width >> 1);
height = std::max(1, height >> 1);
depth = std::max(1, depth >> 1);
SetLevelInfo(target_ == GL_TEXTURE_2D ? GL_TEXTURE_2D :
FaceIndexToGLTarget(ii),
level,
info1.internal_format,
width,
height,
depth,
info1.border,
info1.format,
info1.type);
}
}
}
bool TextureManager::TextureInfo::CanGenerateMipmaps() const {
if (npot()) {
return false;
}
const TextureInfo::LevelInfo& first = level_infos_[0][0];
// TODO(gman): Check internal_format, format and type.
for (size_t ii = 0; ii < level_infos_.size(); ++ii) {
const LevelInfo& info = level_infos_[ii][0];
if ((!info.valid) ||
(info.width != first.width) ||
(info.height != first.height) ||
(info.depth != 1) ||
(info.format != first.format) ||
(info.internal_format != first.internal_format) ||
(info.type != first.type)) {
return false;
}
}
return true;
}
void TextureManager::TextureInfo::SetLevelInfo(
GLenum target,
GLint level,
GLint internal_format,
GLsizei width,
GLsizei height,
GLsizei depth,
GLint border,
GLenum format,
GLenum type) {
DCHECK_GE(level, 0);
DCHECK_LT(static_cast<size_t>(GLTargetToFaceIndex(target)),
level_infos_.size());
DCHECK_LT(static_cast<size_t>(level),
level_infos_[GLTargetToFaceIndex(target)].size());
DCHECK_GE(width, 0);
DCHECK_GE(height, 0);
DCHECK_GE(depth, 0);
TextureInfo::LevelInfo& info =
level_infos_[GLTargetToFaceIndex(target)][level];
info.valid = true;
info.internal_format = internal_format;
info.width = width;
info.height = height;
info.depth = depth;
info.border = border;
info.format = format;
info.type = type;
max_level_set_ = std::max(max_level_set_, level);
Update();
}
void TextureManager::TextureInfo::Update() {
// Update npot status.
npot_ = false;
for (size_t ii = 0; ii < level_infos_.size(); ++ii) {
const TextureInfo::LevelInfo& info = level_infos_[ii][0];
if (((info.width & (info.width - 1)) != 0) ||
((info.height & (info.height - 1)) != 0) ||
((info.depth & (info.depth - 1)) != 0)) {
npot_ = true;
break;
}
}
// Update texture_complete status.
const TextureInfo::LevelInfo& first_face = level_infos_[0][0];
texture_complete_ =
(max_level_set_ == ComputeMipMapCount(first_face.width,
first_face.height,
first_face.depth) - 1) &&
max_level_set_ >= 0;
cube_complete_ = (level_infos_.size() == 6) &&
(first_face.width == first_face.height);
for (size_t ii = 0;
ii < level_infos_.size() && cube_complete_ && texture_complete_;
++ii) {
const TextureInfo::LevelInfo& level0 = level_infos_[ii][0];
if (!level0.valid ||
level0.width != first_face.width ||
level0.height != first_face.height ||
level0.depth != 1 ||
level0.internal_format != first_face.internal_format ||
level0.format != first_face.format ||
level0.type != first_face.type) {
cube_complete_ = false;
}
// Get level0 dimensions
GLsizei width = level0.width;
GLsizei height = level0.height;
GLsizei depth = level0.depth;
for (GLint jj = 0; jj <= max_level_set_; ++jj) {
// compute required size for mip.
width = std::max(1, width >> 1);
height = std::max(1, height >> 1);
depth = std::max(1, depth >> 1);
const TextureInfo::LevelInfo& info = level_infos_[ii][jj];
if (!info.valid ||
info.width != width ||
info.height != height ||
info.depth != depth ||
info.internal_format != level0.internal_format ||
info.format != level0.format ||
info.type != level0.type) {
texture_complete_ = false;
break;
}
}
}
}
TextureManager::TextureManager(
GLint max_texture_size, GLint max_cube_map_texture_size)
: max_texture_size_(max_texture_size),
max_cube_map_texture_size_(max_cube_map_texture_size),
max_levels_(ComputeMipMapCount(max_texture_size,
max_texture_size,
max_texture_size)),
max_cube_map_levels_(ComputeMipMapCount(max_cube_map_texture_size,
max_cube_map_texture_size,
max_cube_map_texture_size)) {
}
void TextureManager::CreateTextureInfo(GLuint texture) {
TextureInfo* info = new TextureInfo(texture);
std::pair<TextureInfoMap::iterator, bool> result =
texture_infos_.insert(
std::make_pair(texture, linked_ptr<TextureInfo>(info)));
DCHECK(result.second);
}
TextureManager::TextureInfo* TextureManager::GetTextureInfo(
GLuint texture) {
TextureInfoMap::iterator it = texture_infos_.find(texture);
return it != texture_infos_.end() ? &(*it->second) : NULL;
}
void TextureManager::RemoveTextureInfo(GLuint texture_id) {
texture_infos_.erase(texture_id);
}
} // namespace gles2
} // namespace gpu
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