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The set of APIs used to compile, link, and pass parameters to GLSL programs are specified in three OpenGL extensions, and became part of core OpenGL as of OpenGL Version 2.0. The API was expanded with geometry shaders in OpenGL 3.2, tessellation shaders in OpenGL 4.0 and compute shaders in OpenGL 4.3. These OpenGL APIs are found in the extensions:
Geometry shaders were introduced in Direct3D 10 and OpenGL 3.2; formerly available in OpenGL 2.0+ with the use of extensions. [7] This type of shader can generate new graphics primitives, such as points, lines, and triangles, from those primitives that were sent to the beginning of the graphics pipeline. [8] Geometry shader programs are ...
The GL 2.1 object model was built upon the state-based design of OpenGL. That is, to modify an object or to use it, one needs to bind the object to the state system, then make modifications to the state or perform function calls that use the bound object. Because of OpenGL's use of a state system, objects must be mutable.
The vertex buffer object specification has been standardized by the OpenGL Architecture Review Board Archived 2011-11-24 at the Wayback Machine as of OpenGL Version 1.5 (in 2003). Similar functionality was available before the standardization of VBOs via the Nvidia -created extension "vertex array range" [ 1 ] or ATI 's "vertex array object ...
It is a direct representation of the intermediate shader bytecode which is passed to the graphics driver for execution. The shader assembly language cannot be directly used to program unified Shader Model 4.0, 4.1, 5.0, and 5.1, although it retains its function as a representation of the intermediate bytecode for debug purposes. [6]
The ARB Vertex Program extension provides APIs to load ARBvp1.0 assembly instructions, enable selected programs, and to set various GPU parameters. Vertex programs are used to modify vertex properties, such as position, normals and texture coordinates, that are passed to the next pipeline process: often a fragment shader; more recently, a ...
Cg programs are merely vertex and pixel shaders, and they need supporting programs that handle the rest of the rendering process. Cg can be used with two graphics APIs : OpenGL or DirectX . Each has its own set of Cg functions to communicate with the Cg program, like setting the current Cg shader, passing parameters, and such tasks.
This pixel shader then renders to all render targets with a single draw command. A common use of MRT is deferred shading, a shading process which, unlike forward shading, performs lighting calculations on an entire 3D scene at once instead of on each individual object. To do this in real-time, MRT is used to store the required information for ...