glFog

Description

GL_FOG_MODE

params is a single integer or floating-point value that specifies the equation to be used to compute the fog blend factor, $\mathit{f}$ . Three symbolic constants are accepted: GL_LINEAR , GL_EXP , and GL_EXP2 . The equations corresponding to these symbolic constants are defined below. The initial fog mode is GL_EXP .

GL_FOG_DENSITY

params is a single integer or floating-point value that specifies $\mathit{density}$ , the fog density used in both exponential fog equations. Only nonnegative densities are accepted. The initial fog density is 1.

GL_FOG_START

params is a single integer or floating-point value that specifies $\mathit{start}$ , the near distance used in the linear fog equation. The initial near distance is 0.

GL_FOG_END

params is a single integer or floating-point value that specifies $\mathit{end}$ , the far distance used in the linear fog equation. The initial far distance is 1.

GL_FOG_INDEX

params is a single integer or floating-point value that specifies ${\mathit{i}}_{\mathit{f}}$ , the fog color index. The initial fog index is 0.

GL_FOG_COLOR

params contains four integer or floating-point values that specify ${\mathit{C}}_{\mathit{f}}$ , the fog color. Integer values are mapped linearly such that the most positive representable value maps to 1.0, and the most negative representable value maps to $-1.0$ . Floating-point values are mapped directly. After conversion, all color components are clamped to the range $\left[0,1\right]$ . The initial fog color is (0, 0, 0, 0).

GL_FOG_COORD_SRC

params contains either of the following symbolic constants: GL_FOG_COORD or GL_FRAGMENT_DEPTH . GL_FOG_COORD specifies that the current fog coordinate should be used as distance value in the fog color computation. GL_FRAGMENT_DEPTH specifies that the current fragment depth should be used as distance value in the fog computation.

Notes

Errors

Associated Gets

See Also

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