OpenGL Programming/Shaders reference

Vertex shader1

Input variables

Output variables

  • vec4 gl_Position : vertex homogeneous coordinates in projection space
  • float gl_PointSize : using rendering points, size of the point

Fragment shader

Input variables

  • vec4 gl_FragCoord : pixel coordinates (x,y) + fragment depth (z)
  • bool gl_FrontFacing : is pixel facing the camera or the opposite direction? (used in two-sided lighting)
  • vec2 gl_PointCoord : when using Point Sprites, position within the point

Output variables

  • vec4 gl_FragColor : RGBA color to use
  • vec4 gl_FragData[gl_MaxDrawBuffers] : alternative to gl_FragColor when drawing to multiple buffers


References

  • "OpenGL ES Shading Language 1.0.17 Specification" (PDF). Khronos.org. 2009-05-12. Retrieved 2011-09-25.
- Comment on this page

- Recent stats

< OpenGL Programming

Browse & download complete code
This article is issued from Wikibooks. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.