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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/program_manager.h"
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/scoped_ptr.h"
#include "base/string_util.h"
#include "gpu/command_buffer/service/gles2_cmd_decoder.h"
namespace gpu {
namespace gles2 {
bool ProgramManager::IsInvalidPrefix(const char* name, size_t length) {
static const char kInvalidPrefix[] = { 'g', 'l', '_' };
return (length >= sizeof(kInvalidPrefix) &&
memcmp(name, kInvalidPrefix, sizeof(kInvalidPrefix)) == 0);
}
void ProgramManager::ProgramInfo::Update() {
GLint num_attribs = 0;
GLint max_len = 0;
glGetProgramiv(program_id_, GL_ACTIVE_ATTRIBUTES, &num_attribs);
attrib_infos_.resize(num_attribs);
glGetProgramiv(program_id_, GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, &max_len);
// TODO(gman): Should we check for error?
scoped_array<char> name_buffer(new char[max_len]);
for (GLint ii = 0; ii < num_attribs; ++ii) {
GLsizei length;
GLsizei size;
GLenum type;
glGetActiveAttrib(
program_id_, ii, max_len, &length, &size, &type, name_buffer.get());
// TODO(gman): Should we check for error?
GLint location = IsInvalidPrefix(name_buffer.get(), length) ? -1 :
glGetAttribLocation(program_id_, name_buffer.get());
SetAttributeInfo(ii, size, type, location, name_buffer.get());
}
GLint num_uniforms;
glGetProgramiv(program_id_, GL_ACTIVE_UNIFORMS, &num_uniforms);
uniform_infos_.resize(num_uniforms);
sampler_indices_.clear();
glGetProgramiv(program_id_, GL_ACTIVE_UNIFORM_MAX_LENGTH, &max_len);
name_buffer.reset(new char[max_len]);
GLint max_location = -1;
for (GLint ii = 0; ii < num_uniforms; ++ii) {
GLsizei length;
GLsizei size;
GLenum type;
glGetActiveUniform(
program_id_, ii, max_len, &length, &size, &type, name_buffer.get());
// TODO(gman): Should we check for error?
GLint location = IsInvalidPrefix(name_buffer.get(), length) ? -1 :
glGetUniformLocation(program_id_, name_buffer.get());
SetUniformInfo(ii, size, type, location, name_buffer.get());
const UniformInfo& info = uniform_infos_[ii];
for (size_t jj = 0; jj < info.element_locations.size(); ++jj) {
if (info.element_locations[jj] > max_location) {
max_location = info.element_locations[jj];
}
}
if (info.IsSampler()) {
sampler_indices_.push_back(ii);
}
}
// Create location to index map.
location_to_index_map_.resize(max_location + 1);
for (GLint ii = 0; ii <= max_location; ++ii) {
location_to_index_map_[ii] = -1;
}
for (GLint ii = 0; ii < num_uniforms; ++ii) {
const UniformInfo& info = uniform_infos_[ii];
for (size_t jj = 0; jj < info.element_locations.size(); ++jj) {
location_to_index_map_[info.element_locations[jj]] = ii;
}
}
}
GLint ProgramManager::ProgramInfo::GetUniformLocation(
const std::string& name) const {
for (GLuint ii = 0; ii < uniform_infos_.size(); ++ii) {
const UniformInfo& info = uniform_infos_[ii];
if (info.name == name ||
(info.is_array &&
info.name.compare(0, info.name.size() - 3, name) == 0)) {
return info.element_locations[0];
} else if (info.is_array &&
name.size() >= 3 && name[name.size() - 1] == ']') {
// Look for an array specification.
size_t open_pos = name.find_last_of('[');
if (open_pos != std::string::npos &&
open_pos < name.size() - 2 &&
info.name.size() > open_pos &&
name.compare(0, open_pos, info.name, 0, open_pos) == 0) {
GLint index = 0;
size_t last = name.size() - 1;
bool bad = false;
for (size_t pos = open_pos + 1; pos < last; ++pos) {
int8 digit = name[pos] - '0';
if (digit < 0 || digit > 9) {
bad = true;
break;
}
index = index * 10 + digit;
}
if (!bad && index >= 0 && index < info.size) {
return info.element_locations[index];
}
}
}
}
return -1;
}
GLint ProgramManager::ProgramInfo::GetAttribLocation(
const std::string& name) const {
for (GLuint ii = 0; ii < attrib_infos_.size(); ++ii) {
const VertexAttribInfo& info = attrib_infos_[ii];
if (info.name == name) {
return info.location;
}
}
return -1;
}
bool ProgramManager::ProgramInfo::GetUniformTypeByLocation(
GLint location, GLenum* type) const {
if (location >= 0 &&
static_cast<size_t>(location) < location_to_index_map_.size()) {
GLint index = location_to_index_map_[location];
if (index >= 0) {
*type = uniform_infos_[index].type;
return true;
}
}
return false;
}
void ProgramManager::ProgramInfo::SetUniformInfo(
GLint index, GLsizei size, GLenum type, GLint location,
const std::string& name) {
DCHECK(static_cast<unsigned>(index) < uniform_infos_.size());
const char* kArraySpec = "[0]";
UniformInfo& info = uniform_infos_[index];
info.size = size;
info.type = type;
info.name = name;
info.element_locations.resize(size);
info.element_locations[0] = location;
size_t num_texture_units = info.IsSampler() ? size : 0u;
info.texture_units.clear();
info.texture_units.resize(num_texture_units, 0);
if (size > 1) {
for (GLsizei ii = 1; ii < info.size; ++ii) {
std::string element_name(name + "[" + IntToString(ii) + "]");
info.element_locations[ii] =
glGetUniformLocation(program_id_, element_name.c_str());
}
// Sadly there is no way to tell if this is an array except if the name
// has an array string or the size > 1. That means an array of size 1 can
// be ambiguous.
//
// For now we just make sure that if the size is > 1 then the name must have
// an array spec.
// Go through the array element locations looking for a match.
// We can skip the first element because it's the same as the
// the location without the array operators.
size_t array_pos = name.rfind(kArraySpec);
if (name.size() > 3 && array_pos != name.size() - 3) {
info.name = name + kArraySpec;
}
}
info.is_array =
(size > 1 ||
(info.name.size() > 3 &&
info.name.rfind(kArraySpec) == info.name.size() - 3));
}
bool ProgramManager::ProgramInfo::SetSamplers(
GLint location, GLsizei count, const GLint* value) {
if (location >= 0 &&
static_cast<size_t>(location) < location_to_index_map_.size()) {
GLint index = location_to_index_map_[location];
if (index >= 0) {
UniformInfo& info = uniform_infos_[index];
if (info.IsSampler() && count <= info.size) {
std::copy(value, value + count, info.texture_units.begin());
return true;
}
}
}
return false;
}
void ProgramManager::CreateProgramInfo(GLuint program_id) {
std::pair<ProgramInfoMap::iterator, bool> result =
program_infos_.insert(
std::make_pair(program_id,
ProgramInfo::Ref(new ProgramInfo(program_id))));
DCHECK(result.second);
}
ProgramManager::ProgramInfo* ProgramManager::GetProgramInfo(GLuint program_id) {
ProgramInfoMap::iterator it = program_infos_.find(program_id);
return it != program_infos_.end() ? it->second : NULL;
}
void ProgramManager::RemoveProgramInfo(GLuint program_id) {
ProgramInfoMap::iterator it = program_infos_.find(program_id);
if (it != program_infos_.end()) {
it->second->MarkAsDeleted();
program_infos_.erase(it);
}
}
} // namespace gles2
} // namespace gpu
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