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What changed in OpenGL 4.4?
The release’s additions focus on managing GPU resources and reducing overhead in common API operations. The main features are:
- Immutable buffer storage (
GL_ARB_buffer_storage): Allocate buffer storage with specified placement and cache behavior controls, including options for CPU mapping while the GPU uses the resource. - Query-buffer objects (
GL_ARB_query_buffer_object): Write query results into buffer objects, which can avoid a CPU wait when the GPU will consume those results. - Enhanced layout qualifiers (
GL_ARB_enhanced_layouts): Add layout controls for interface blocks, packing, transform feedback, and shader-variable locations. - Multi-bind (
GL_ARB_multi_bind): Bind or unbind arrays of objects of the same type in one call, rather than making repeated calls. - Direct texture clearing (
GL_ARB_clear_texture): Clear texture images directly. - Mirror-clamp-to-edge (
GL_ARB_texture_mirror_clamp_to_edge): Adds a texture sampling mode that mirrors coordinates at the edge. - Stencil8 textures (
GL_ARB_texture_stencil8): Requires support for an 8-bit stencil texture format. - Packed vertex attributes (
GL_ARB_vertex_type_10f_11f_11f_rev): Adds a packed three-component vertex attribute format with 11F/11F/10F components.
These additions address different concerns: buffer lifetime and mapping, repeated binding calls, query synchronization, texture operations, and compact vertex data. Khronos’ OpenGL 4.4 release announcement and Core Profile specification provide the primary descriptions.
Which extensions became core, and which remain optional?
The feature list above describes OpenGL 4.4 core additions. The 4.4 materials also document other ARB and Khronos extensions, including bindless textures, sparse textures, and shader group vote. Their appearance alongside the specification does not make them universally available: extension support depends on the implementation and its driver. Check the actual context’s supported extensions before using one.
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Khronos’ OpenGL version history summarizes version changes and related extensions. The OpenGL Registry indexes extension specifications and version documents.
Where can you download the OpenGL 4.4 specification?
Use Khronos’ official documents, selecting the one that matches the question you need to answer:
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- OpenGL 4.4 Core Profile specification — the reference for core API behavior.
- OpenGL 4.4 Compatibility Profile specification — use when legacy fixed-function compatibility matters.
- OpenGL Shading Language 4.40 specification — the shader-language rules for this version.
- OpenGL Registry — the official index for specifications, extension documents, and reference materials.
- OpenGL 4.4 API Reference Card — a concise lookup aid, not a substitute for the full specifications.
What is the difference between Core and Compatibility profiles?
The two PDFs describe different profiles of the same OpenGL version. The Core Profile is the appropriate reference for modern core API behavior. The Compatibility Profile is relevant when an application depends on legacy fixed-function behavior. Choose based on the API your program targets; the documents are not interchangeable when compatibility features matter.
Does my driver support ARB_buffer_storage?
The existence of GL_ARB_buffer_storage and its inclusion as an OpenGL 4.4 feature do not establish that a particular GPU and driver expose it. At runtime, inspect the OpenGL context’s version and extension list, using the mechanism appropriate to the API and context you created. If the extension is listed, use its extension entry points and rules as applicable; if the feature is exposed through a 4.4-or-newer core context, consult that version’s specification. Do not infer support from a GPU model name or from the installed SDK alone.
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Khronos said OpenGL 4.4 maintained full backward compatibility. The release announcement also described the first formal OpenGL conformance tests since OpenGL 2.0 and made full certification mandatory for OpenGL 4.4 and later, with the aim of reducing differences among vendor drivers and improving portability. Certification requirements set an expectation for implementations; they do not remove the need to test an application on the drivers and systems it supports.
Khronos summarized the release as: “OpenGL 4.4 unlocks capabilities of today’s leading-edge graphics hardware while maintaining full backwards compatibility.” — Khronos Group, July 22, 2013.
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