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Howto:Shader programming in FlightGear: Difference between revisions
Howto:Shader programming in FlightGear (view source)
Revision as of 20:25, 26 March 2010
, 26 March 2010→Vertex Shaders
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Vertex Shaders take application geometry and per-vertex attributes as input and transform the input data in some meaningful way. | Vertex Shaders take application geometry and per-vertex attributes as input and transform the input data in some meaningful way. | ||
* A vertex shader MUST write to gl_Position | |||
* A vertex shader CAN write to gl_PointSize, gl_ClipVertex | |||
* gl_Vertex is an attribute supplying the untransformed vertex coordinate | |||
* gl_Position is an special output variable for the transformed vertex coordinate | |||
Common tasks for a vertex shader include: | Common tasks for a vertex shader include: | ||