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// Copyright 2010 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBGL_GL_STRING_QUERY_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBGL_GL_STRING_QUERY_H_
#include "base/check_op.h"
#include "base/memory/raw_ptr.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "third_party/blink/renderer/platform/wtf/text/string_buffer.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "third_party/khronos/GLES2/gl2ext.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* returned_length,
LChar* ptr) {
return gl->GetProgramInfoLog(id, length, returned_length,
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* returned_length,
LChar* ptr) {
gl->GetShaderInfoLog(id, length, returned_length,
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* returned_length,
LChar* ptr) {
gl->GetTranslatedShaderSourceANGLE(id, length, returned_length,
reinterpret_cast<GLchar*>(ptr));
}
};
GLStringQuery(gpu::gles2::GLES2Interface* gl) : gl_(gl) {}
template <class Traits>
WTF::String Run(GLuint id) {
GLint length = 0;
Traits::LengthFunction(gl_, id, &length);
if (!length)
return WTF::g_empty_string;
GLsizei returned_length = 0;
StringBuffer<LChar> log_buffer(length);
Traits::LogFunction(gl_, id, length, &returned_length,
log_buffer.Span().data());
// 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(returned_length + 1, length);
return String::Adopt(log_buffer);
}
private:
raw_ptr<gpu::gles2::GLES2Interface> gl_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBGL_GL_STRING_QUERY_H_
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