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// Copyright 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.
#ifndef GLStringQuery_h
#define GLStringQuery_h
#include "gpu/command_buffer/client/gles2_interface.h"
#include "wtf/text/WTFString.h"
namespace blink {
// Performs a query for a string on GLES2Interface and returns a WTF::String. If
// it is unable to query the string, it wil return an empty WTF::String.
class GLStringQuery {
public:
struct ProgramInfoLog {
static void LengthFunction(gpu::gles2::GLES2Interface* gl,
GLuint id,
GLint* length) {
return gl->GetProgramiv(id, GL_INFO_LOG_LENGTH, length);
}
static void LogFunction(gpu::gles2::GLES2Interface* gl,
GLuint id,
GLint length,
GLint* returnedLength,
LChar* ptr) {
return gl->GetProgramInfoLog(id, length, returnedLength,
reinterpret_cast<GLchar*>(ptr));
}
};
struct ShaderInfoLog {
static void LengthFunction(gpu::gles2::GLES2Interface* gl,
GLuint id,
GLint* length) {
gl->GetShaderiv(id, GL_INFO_LOG_LENGTH, length);
}
static void LogFunction(gpu::gles2::GLES2Interface* gl,
GLuint id,
GLint length,
GLint* returnedLength,
LChar* ptr) {
gl->GetShaderInfoLog(id, length, returnedLength,
reinterpret_cast<GLchar*>(ptr));
}
};
struct TranslatedShaderSourceANGLE {
static void LengthFunction(gpu::gles2::GLES2Interface* gl,
GLuint id,
GLint* length) {
gl->GetShaderiv(id, GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE, length);
}
static void LogFunction(gpu::gles2::GLES2Interface* gl,
GLuint id,
GLint length,
GLint* returnedLength,
LChar* ptr) {
gl->GetTranslatedShaderSourceANGLE(id, length, returnedLength,
reinterpret_cast<GLchar*>(ptr));
}
};
GLStringQuery(gpu::gles2::GLES2Interface* gl) : m_gl(gl) {}
template <class Traits>
WTF::String Run(GLuint id) {
GLint length = 0;
Traits::LengthFunction(m_gl, id, &length);
if (!length)
return WTF::emptyString();
LChar* logPtr;
RefPtr<WTF::StringImpl> nameImpl =
WTF::StringImpl::createUninitialized(length, logPtr);
GLsizei returnedLength = 0;
Traits::LogFunction(m_gl, id, length, &returnedLength, logPtr);
// The returnedLength excludes the null terminator. If this check wasn't
// true, then we'd need to tell the returned String the real length.
DCHECK_EQ(returnedLength + 1, length);
return String(nameImpl.release());
}
private:
gpu::gles2::GLES2Interface* m_gl;
};
} // namespace blink
#endif // GLStringQuery_h
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