With triangle fan, you need 3 vertices for the first triangle and then only 1 additional vertex for every additional segment, with regular triangles you will need the full 3 vertices for every segment of the circle. The number of vertices, needed to draw the circle will grow. glGetProgramInfoLog returns in infoLog as much of the information log as it can, up to a maximum. SPARTAN SGI, version 5.1.3 OpenGL Wavefunction P.D.E., E.P.A.N. The string that is returned will be null terminated. The information log for a program object is modified when the program object is linked or validated.
It supports OpenGL versions from 3.3 to 4.3, only forward compatible contexts.
Xenia opengl 4.3 code#
The code needed to create, setup and use objects is reduced and made intuitive. New functionality includes: compute shaders that harness GPU parallelism for advanced computation, shader storage buffers, improved debug message output, high. glGetProgramInfoLog returns the information log for the specified program object. All extensions needed to expose features for requested OpenGL version are loaded automatically. But if you convert the circle primitive to a polygonal mesh, you could render regular triangles. An anonymous reader writes 'The Khronos Group has released the specification for OpenGL 4.3 at the SIGGRAPH 2012 conference in Los Angeles.
Combined with instancing and adaptive LOD you can get significant performance improvements.įor the circle - in primitive mode the most efficient way to draw it is using a triangle fan. It is a good idea to sort the different scene objects in such an order to allow minimizing the number of draw calls, which is the typical bottleneck 3D graphics struggles with. OpenGL 4.3 API Reference Card OpenGL Operation Floating-Point Numbers 2.3.3 16-Bit 1-bit sign, 5-bit exponent, 10-bit mantissa Unsigned 11-Bit no sign bit, 5-bit exponent, 6-bit mantissa Unsigned 10-Bit no sign bit, 5-bit exponent, 5-bit mantissa Command LettersTable 2.2 Letters are used in commands to denote types. You can also chose to convert the cube primitive to another compatible object, for example a box primitive where you have 3 properties - height, width and depth, or even an arbitrary polygonal mesh that is made of faces, which are made of edges which are made of vertices. From that single property you generate the full set of vertices required to render a cube. Objects are responsible for generating their vertex data and corresponding drawing calls and schedule them appropriately.įor example, you can have a cube object that has a single property - edge length. In a real world application you will have scene management, with multiple objects in the scene and multiple sub-objects for each object.
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