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diff --git a/src/gl/init.h b/src/gl/init.h
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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.
+
+// OpenGL initialization.
+
+#ifndef GLPLANET_SRC_GL_INIT_H_
+#define GLPLANET_SRC_GL_INIT_H_
+
+#include "src/gl/error.h"
+#include "src/util.h"
+#include "third_party/glew/include/GL/glew.h"
+
+namespace gl {
+
+// OpenGL capabilities
+enum class Capability : GLenum {
+  kBlend = GL_BLEND,
+  kClipDistance0 = GL_CLIP_DISTANCE0,
+  kClipDistance1 = GL_CLIP_DISTANCE1,
+  kClipDistance2 = GL_CLIP_DISTANCE2,
+  kClipDistance3 = GL_CLIP_DISTANCE3,
+  kClipDistance4 = GL_CLIP_DISTANCE4,
+  kClipDistance5 = GL_CLIP_DISTANCE5,
+  kColorLogicOp = GL_COLOR_LOGIC_OP,
+  kCullFace = GL_CULL_FACE,
+  kDepthClamp = GL_DEPTH_CLAMP,
+  kDepthTest = GL_DEPTH_TEST,
+  kDither = GL_DITHER,
+  kFramebufferSrgb = GL_FRAMEBUFFER_SRGB,
+  kLineSmooth = GL_LINE_SMOOTH,
+  kMultisample = GL_MULTISAMPLE,
+  kPolygonOffsetFill = GL_POLYGON_OFFSET_FILL,
+  kPolygonOffsetLine = GL_POLYGON_OFFSET_LINE,
+  kPolygonOffsetPoint = GL_POLYGON_OFFSET_POINT,
+  kPolygonSmooth = GL_POLYGON_SMOOTH,
+  kRasterizerDiscard = GL_RASTERIZER_DISCARD,
+  kSampleAlphaToCoverage = GL_SAMPLE_ALPHA_TO_COVERAGE,
+  kSampleAlphaToOne = GL_SAMPLE_ALPHA_TO_ONE,
+  kSampleCoverage = GL_SAMPLE_COVERAGE,
+  kSampleShading = GL_SAMPLE_SHADING,
+  kSampleMask = GL_SAMPLE_MASK,
+  kScissorTest = GL_SCISSOR_TEST,
+  kStencilTest = GL_STENCIL_TEST,
+  kProgramPointSize = GL_PROGRAM_POINT_SIZE,
+
+  // Added in GL 3.1
+  kPrimitiveRestart = GL_PRIMITIVE_RESTART,
+
+  // Added in GL 3.2
+  kTextureCubeMapSeamless = GL_TEXTURE_CUBE_MAP_SEAMLESS,
+};
+
+// Initializes the OpenGL state machine in the current thread. The current
+// thread must have an OpenGL context bound.
+//
+// You must call this function exactly once in your program. Once you do so, you
+// may not call any other function in this namespace from any other thread.
+void InitializeForThisThread();
+
+// Enables the specified OpenGL capability.
+inline void Enable(Capability cap) noexcept(
+    !(gl_internal::kThreadSafetyChecks ||
+      gl_internal::kAggressiveErrorChecking)) {
+  gl_internal::CheckThreadSafety();
+  glEnable(FromEnum(cap));
+  gl_internal::UnnecessaryErrorCheck();
+}
+
+// Sets the clear color for the active framebuffer. Color coordinates should be
+// in the range [0, 1].
+void SetClearColor(float red, float green, float blue, float alpha);
+
+}  // namespace gl
+
+#endif  // GLPLANET_SRC_GL_INIT_H_