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Howto:Shader programming in FlightGear: Difference between revisions
Howto:Shader programming in FlightGear (view source)
Revision as of 20:27, 26 March 2010
, 26 March 2010→Fragment Shaders
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Note: Loading a fragment shader turns off parts of the OpenGL pipeline (pixel shaders fully replace the "Texturing Unit") | Note: Loading a fragment shader turns off parts of the OpenGL pipeline (pixel shaders fully replace the "Texturing Unit") | ||
The other shader (the "Fragment shader" - also known (incorrectly) as the " | The other shader (the "Fragment shader" - also known (incorrectly) as the "pixel shader") takes one pixel from the rasterizer and generates one pixel to write or blend into the frame buffer. | ||
A fragment shader can write to the following special output variables: | |||
* gl_FragColor to set the color of the fragment | |||
* gl_FragData[n] to output to a specific render target | |||
* gl_FragDepth to set the fragment depth | |||
Common tasks of fragment shaders include: | Common tasks of fragment shaders include: | ||