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CeedMath & CeedGL, Let's talk 3D...
- 1. CeedMath & CeedGL Let’s talk 3D... web: www.creaceed.com twitter: @rsebbe cocoaheads.be
- 2. Overview • CeedMath & CeedGL are libraries for easier computer graphics development on Mac & iOS • BSD license • Available on Github • https://github.com/rsebbe/CeedMath • https://github.com/rsebbe/CeedGL
- 3. Overview App Ceed3DGL Ceed3DRenderMan ... CeedGL Ceed3D GL CeedMath Foundation
- 4. CeedMath
- 5. Why? • CG math libs are generally written in C++ • C++ is cumbersome when developing in Objective-C • Need of a pure C library • Need for both float & double data type
- 6. Definition • Written in pure C • Macro-based templates, float & double • Simple types (float*) • Chain-able • C++ interoperable (polymorphic) • In C, use _f or _d suffixes • In C++, automatic based on param type
- 7. Types • vector (2D, 3D, 4D) • normal (3D) / plane (4D) • matrix (2D, 4D) • quaternion (4D) • ray • box • frustum • triangle
- 8. What? • vector: add, subtract, dot/vect product, norm, rotate, project, find angles, lerp... • matrix: add, subtract, multiply, transform, solve, invert... • quaternion: standard operations... • ray: intersections w/ plane/triangle/box... • box: union / intersection... • frustum: perspective transform... • triangle: normal computation
- 9. Xcode Project • Universal: Mac & iOS libs • Headers note • lib: PUBLIC_HEADERS_FOLDER_PATH = /usr/local/include/CeedMath • app: HEADER_SEARCH_PATHS = "$(DSTROOT)/usr/local/include" "$ (CONFIGURATION_BUILD_DIR)/usr/local/include" • #include <CeedMath/C3Math.h>
- 10. Demo • Demo #1: template mechanics • Demo #2: real world example (rounded rect) C3MeshGeometry+Primitives.mm • Demo #3: C++ templates for mouse picking C3StreamPrimitive+Picking.mm
- 11. Demo
- 12. Demo’s
- 13. CeedGL
- 14. Why? • OpenGL is a C API, most GL objects are int’s • Error prone, all function take int’s • Complex APIs, many functions • Not practical within Objective-C • Intimidating, hard to start • Higher level abstractions exist (scene graphs), but what if you only need standard OpenGL?
- 15. Old vs. Modern OpenGL OpenGL 1.x, 2.x OpenGL ES 1.x define camera position, define object position, choose a predefined illumination model, place the lights, draw some triangles, change position, draw some other... OpenGL >= 3.1 OpenGL ES 2.x + WebGL set vertices, indices, shading program & params, then draw
- 16. OpenGL • Modern OpenGL programming is hard. Especially the first time... • It’s a functional C API • Most “objects” are represented by handles (int) • Modern GL has removed many concepts • Light, shading, transforms • For the good, the old pipeline was limiting, and a hurdle for card makers • It is now more in sync w/ hardware capabilities
- 17. CeedGL • CeedGL does not define new concepts • But it helps in setting up and managing your OpenGL objects • Thin Objective-C Wrapper
- 18. CeedGL GLObject GLFramebuffer GLRenderbuffer GLBuffer GLTexture GLShader GLProgram GLValue GLDrawCommand
- 19. Draw (1/2) • Vertex Shader • 1 execution per vertex • inputs: uniform, attribute • output: varying • Fragment Shader • 1 execution per output pixel • input: uniform, varying • output: fragment color
- 20. Draw (2/2) GLDrawCommand GLFramebuffer GLProgram u GLValue GLRenderbuffer v GLShader a GLValue GLTexture f GLShader a GLBuffer i GLBuffer t GLTexture
- 21. Demo’s
- 22. GLKit? • GLKit’s Math • NEON optimized • Currently iOS5 only, definitely Apple only • Has an overlap with CeedMath • GLKit’s GL • Forces a GL coding style • Provides easier starting point • Mostly complementary to CeedGL • Permissive, forkable open source make sense in such projects
- 23. Happy 3D coding ! web: www.creaceed.com twitter: @rsebbe cocoaheads.be