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// Copyright 2021 Benjamin Barenblat
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "src/gl/init.h"
#include <stdexcept>
#include "src/gl/error.h"
#include "third_party/abseil/absl/strings/str_cat.h"
#include "third_party/abseil/absl/strings/substitute.h"
#include "third_party/glew/include/GL/glew.h"
namespace gl {
namespace {
using ::gl_internal::ErrorCheck;
using ::gl_internal::UnnecessaryErrorCheck;
void InitializeGlew() {
glewExperimental = GL_TRUE;
if (GLenum err = glewInit(); err != GLEW_OK) {
const GLubyte* error_string = glewGetErrorString(err);
throw std::runtime_error(absl::StrCat(
"GL: glewInit failed: ", reinterpret_cast<const char*>(error_string)));
}
}
void CheckGlVersion() {
GLint major_version;
try {
glGetIntegerv(GL_MAJOR_VERSION, &major_version);
ErrorCheck();
} catch (const std::invalid_argument&) {
// GL_MAJOR_VERSION doesn't even exist yet, which means we're on OpenGL 2.
throw std::runtime_error("GL: OpenGL 3.2 is required");
}
if (major_version == 3) {
GLint minor_version;
glGetIntegerv(GL_MINOR_VERSION, &minor_version);
UnnecessaryErrorCheck();
if (minor_version < 2) {
throw std::runtime_error("GL: OpenGL 3.2 is required");
}
}
}
void CheckGlExtensions() {
if (!GLEW_ARB_texture_storage) {
throw std::runtime_error("GL: ARB_texture_storage is required");
}
if (!GLEW_ARB_direct_state_access) {
throw std::runtime_error("GL: ARB_direct_state_access is required");
}
}
} // namespace
void InitializeForThisThread() {
gl_internal::RecordThread();
InitializeGlew();
ErrorCheck(); // just to make sure we're starting clean
CheckGlVersion();
CheckGlExtensions();
// Assume byte-aligned rows in images.
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
UnnecessaryErrorCheck();
}
void SetClearColor(float red, float green, float blue, float alpha) {
gl_internal::CheckThreadSafety();
if (red < 0 || red > 1 || green < 0 || green > 1 || blue < 0 || blue > 1 ||
alpha < 0 || alpha > 1) {
throw std::invalid_argument(absl::Substitute(
"GL: invalid clear color ($0, $1, $2, $3)", red, green, blue, alpha));
}
glClearColor(red, green, blue, alpha);
gl_internal::UnnecessaryErrorCheck();
}
} // namespace gl
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