Linux Certif

Toute la documentation sur la certification Linux LPI

glslf.3Cg

NAME

glslf - OpenGL fragment profile for the OpenGL Shading Lanauge (GLSL)

SYNOPSIS

   glslf
 
 
 

DESCRIPTION

This OpenGL profile corresponds to the per-fragment functionality introduced by the OpenGL Shading Language.

The compiler output for this profile conforms to the language grammar defined by the OpenGL Shading Language specification.

3D API DEPENDENCIES

Requires support for OpenGL 2.0.

OpenGL Extension Specifications

  http://www.opengl.org/documentation/specs/version2.0/glspec20.pdf
  http://www.opengl.org/documentation/glsl/
  http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.20.8.pdf
 
 
 

PROFILE OPTIONS

None.

DATA TYPES

The Cg half and fixed data types are both mapped to float because GLSL lacks first-class half and fixed data types.

SEMANTICS

VARYING INPUT SEMANTICS

   Binding Semantics Name           Corresponding Data           GLSL Equivalent
 
 
 

   COLOR                            Primary color (float4)       gl_Color
   COLOR0
   COL0
   COL
 
 
 

   COLOR1                           Secondary color (float4)     gl_SecondaryColor
   COL1
 
 
 

   TEXCOORD                         Texture coordinate set 0     gl_TexCoord[0]
   TEXCOORD#                        Texture coordinate set #     gl_TexCoord[#]
   TEX#
 
 
 

   FACE                             Front/back facing (+1/-1)    gl_FrontFacing
 
 
 

UNIFORM INPUT SEMANTICS

Sixteen texture units are supported:

   Binding Semantic Name            Corresponding Data
 
 
 

   TEXUNIT0                         Texture unit 0
   TEXUNIT1                         Texture unit 1
   ...
   TEXUNIT15                        Texture unit 15
 
 
 

The Cg profiles for GLSL provide access to all the uniform constants and variables documented in Section 7.4 (Built-in Constants) and 7.5 (Built-in Uniform State) respectively of the OpenGL Shading Language specification found at:

   http://www.opengl.org/documentation/glsl/
   http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.20.8.pdf
 
 
 

Example:

   glslf void main(float4 color : COLOR,
                   out float4 ocol : COLOR)
   {
     ocol.xyz = mul(gl_NormalMatrix, color.xyz);
     ocol.w = 1;
   }
 
 
 

OUTPUT SEMANTICS

The following standard fragment output semantics are supported:

   Binding Semantics Name           Corresponding Data      GLSL Equivalent
 
 
 

   COLOR                            Output color (float4)   gl_FragColor
   COLOR0
   COL0
   COL
 
 
 

   COLOR0-COLOR7                    Output color (float4)   gl_FragData[n]
   COL0-COL7                        for draw buffers 0 to 7
 
 
 

   DEPTH                            Output depth (float)    gl_FragDepth
   DEPR
 
 
 

STANDARD LIBRARY ISSUES

Fragment program Cg standard library routines are available.

SEE ALSO

glslv, glslg