OpenGL Programming/Shaders reference

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Vertex shader

Output variables

vec4 gl_Position : vertex homegeneous 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". Khronos.org. 2009-05-12. http://www.khronos.org/registry/gles/specs/2.0/GLSL_ES_Specification_1.0.17.pdf. Retrieved 2011-09-25.

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