Contents

• Dependencies
• Overview
• New Procedures and Functions
• New Tokens
• Errors
• New State

Dependencies

OpenGL 1.1 is required.

The extension is written against the OpenGL 1.2 Specification.

Overview

This extension allows specifying an explicit per-vertex fog coordinate to be used in fog computations, rather than using a fragment depth-based fog equation.

New Procedures and Functions

void FogCoord[fd]EXT(T coord) void FogCoord[fd]vEXT(T coord) void FogCoordPointerEXT(enum type, sizei stride, void *pointer)

New Tokens

Accepted by the

<pname>

parameter of Fogi and Fogf:

|FOG_COORDINATE_SOURCE_EXT |0x8450| |:----------------------------|:-----|

Accepted by the

<param>

parameter of Fogi and Fogf:

|FOG_COORDINATE_EXT | 0x8451| |:-----------------------|:------| |FRAGMENT_DEPTH_EXT | 0x8452|

Accepted by the

<pname>

parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetDoublev:

|CURRENT_FOG_COORDINATE_EXT | 0x8453| |:------------------------------------|:-------| |FOG_COORDINATE_ARRAY_TYPE_EXT | 0x8454| |FOG_COORDINATE_ARRAY_STRIDE_EXT | 0x8455|

Accepted by the

<pname>

parameter of GetPointerv:

|FOG_COORDINATE_ARRAY_POINTER_EXT | 0x8456| |:------------------------------------|:-------|

Accepted by the

<array>

parameter of EnableClientState and DisableClientState:

|FOG_COORDINATE_ARRAY_EXT | 0x8457| |:----------------------------|:------|

Errors

INVALID_ENUM is generated if FogCoordPointerEXT parameter

<type>

is not FLOAT or DOUBLE.

INVALID_VALUE is generated if FogCoordPointerEXT parameter

<stride>

is negative.

New State