20 Years of OpenGL. Kurt Akeley. Copyright Khronos Group, Page 1

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1 20 Years of OpenGL Kurt Akeley Copyright Khronos Group, Page 1

2 So many deprecations! Application-generated object names Color index mode SL versions 1.10 and 1.20 Begin / End primitive specification Edge flags Client vertex arrays Rectangles Current raster position Two-sided color selection Non-sprite points Wide lines and line stipple Quad and polygon primitives Separate polygon draw mode Polygon stipple Pixel transfer modes and operation Pixel drawing Bitmaps Legacy pixel formats Depth texture mode Texture wrap mode Texture borders Automatic mipmap generation Fixed-function fragment processing Alpha test Accumulation buffers Pixel copying Auxiliary color buffers Context framebuffer size queries Evaluators Selection and feedback modes Display lists Hints Attribute stacks Unified text string Token names and queries Copyright Khronos Group, Page 2

3 Technology and culture Copyright Khronos Group, Page 3

4 Technology Copyright Khronos Group, Page 4

5 OpenGL is an architecture Different implementations Compatibility Intentional design Configuration Speed Validity of inputs Enforcement Blaauw/Brooks IBM /40/50/65/75 Amdahl Code runs equivalently on all implementations It s an architecture, whether it was planned or not. Can vary amount of resource (e.g., memory) Not a formal aspect of architecture No undefined operation When implementation errors are found, they are fixed. OpenGL SGI Indy/Indigo/InfiniteReality NVIDIA GeForce, ATI Radeon, Top-level goal Conformance tests, Carefully planned, though mistakes were made No feature subsetting Config attributes (e.g., FB) No performance queries All errors specified No side effects Little undefined operation Specification rules! SIGGRAPH ASIA 2008 OpenGL course Copyright Khronos Group, Page 5

6 OpenGL is specified at the right level Imperative API - Follows IRIS GL - Not network protocol (PEX) - Not Pixar collaboration (RM) - Not scene graph (Inventor) Cross-platform - OS specifics compartmentalized - Omitted IRIS GL u/i glclear(gl_color_buffer_bit); // black background glloadidentity(); // allow multipass glortho(0, 4, 0, 4, -1, 1); // int cast to double glbegin(gl_polygon); // draw white square glvertex2i(1, 1); glvertex2i(3, 1); glvertex2i(3, 3); glvertex2i(1, 3); glend(); glflush(); // force completion Copyright Khronos Group, Page 6

7 OpenGL is specified at the right level Imperative API - Follows IRIS GL - Not network protocol (PEX) - Not Pixar collaboration (RM) - Not scene graph (Inventor) Cross-platform - OS specifics compartmentalized - Omitted IRIS GL u/i Above CPU ISA level - Nurtured IHV innovation (CAGRs) - Nurtured data-parallel computing NVIDIA GeForce Performance Improvement Year Product Mtri/sec Yr rate Mfrag/sec Yr rate 1998 Riva ZX Riva TNT GeForce2 GTS GeForce GeForce4 TI GeForce FX yrs 67x x 2.3 Copyright Khronos Group, Page 7

8 Culture Copyright Khronos Group, Page 9

9 OpenGL culture is specification driven From the start - Mark Segal - State tables - Invariance - Extension templates - Extension indexes - Copyright Khronos Group, Page 10

10 OpenGL culture is specification driven From the start - Mark Segal - State tables - Invariance - Extension templates - Extension indexes - As we went - Austin, TX 1.1 review - Extension specifications - Issues and usage examples - Publications Lines Words Chars 56 ARB Extensions 48, ,908 2,221,347 All 442 Extensions 209,426 1,076,008 9,079,063 King James Bible 114, ,647 5,214,085 New Testament 27, ,430 1,197,812 Old Testament 86, ,515 3,998,303 SIGGRAPH ASIA 2008 OpenGL course Copyright Khronos Group, Page 11

11 OpenGL culture is specification driven From the start - Mark Segal - State tables - Invariance - Extension templates - Extension indexes - As we went - Austin, TX 1.1 review - Extension specifications - Issues and usage examples - Publications Copyright Khronos Group, Page 12

12 OpenGL culture does the right thing Copyright Khronos Group, Page 13

13 End Copyright Khronos Group, Page 14

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