s_fog.h File Reference

#include "swrast.h"

Functions
GLfloat	_swrast_z_to_fogfactor (GLcontext *ctx, GLfloat z)
	Used to convert current raster distance to a fog factor in [0,1].
void	_swrast_fog_rgba_span (const GLcontext *ctx, SWspan *span)
	Apply fog to a span of RGBA pixels.
void	_swrast_fog_ci_span (const GLcontext *ctx, SWspan *span)
	As above, but color index mode.

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Function Documentation

void _swrast_fog_ci_span	(	const GLcontext *	ctx,
		SWspan *	span
	)

As above, but color index mode.

void _swrast_fog_rgba_span	(	const GLcontext *	ctx,
		SWspan *	span
	)

Apply fog to a span of RGBA pixels.

The fog value are either in the span->array->fog array or interpolated from the fog/fogStep values. They fog values are either fog coordinates (Z) or fog blend factors. _PreferPixelFog should be in sync with that state!

GLfloat _swrast_z_to_fogfactor	(	GLcontext *	ctx,
		GLfloat	z
	)

Used to convert current raster distance to a fog factor in [0,1].

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