-/* $Id: fog.c,v 1.35 2001/05/30 14:43:17 brianp Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 3.5
+ * Version: 5.1
*
- * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
*/
-#ifdef PC_HEADER
-#include "all.h"
-#else
#include "glheader.h"
#include "colormac.h"
#include "context.h"
#include "fog.h"
#include "mtypes.h"
-#endif
-void
+void GLAPIENTRY
_mesa_Fogf(GLenum pname, GLfloat param)
{
_mesa_Fogfv(pname, ¶m);
}
-void
+void GLAPIENTRY
_mesa_Fogi(GLenum pname, GLint param )
{
GLfloat fparam = (GLfloat) param;
}
-void
+void GLAPIENTRY
_mesa_Fogiv(GLenum pname, const GLint *params )
{
GLfloat p[4];
break;
default:
/* Error will be caught later in _mesa_Fogfv */
- ;
+ ASSIGN_4V(p, 0.0F, 0.0F, 0.0F, 0.0F);
}
_mesa_Fogfv(pname, p);
}
-void
+#define UPDATE_FOG_SCALE(ctx) do {\
+ if (ctx->Fog.End == ctx->Fog.Start)\
+ ctx->Fog._Scale = 1.0f;\
+ else\
+ ctx->Fog._Scale = 1.0f / (ctx->Fog.End - ctx->Fog.Start);\
+ } while(0)
+
+
+void GLAPIENTRY
_mesa_Fogfv( GLenum pname, const GLfloat *params )
{
GET_CURRENT_CONTEXT(ctx);
ctx->Fog.Density = *params;
break;
case GL_FOG_START:
- if (ctx->Fog.Start == *params)
- return;
- FLUSH_VERTICES(ctx, _NEW_FOG);
- ctx->Fog.Start = *params;
- break;
+ if (ctx->Fog.Start == *params)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.Start = *params;
+ UPDATE_FOG_SCALE(ctx);
+ break;
case GL_FOG_END:
- if (ctx->Fog.End == *params)
- return;
- FLUSH_VERTICES(ctx, _NEW_FOG);
- ctx->Fog.End = *params;
- break;
+ if (ctx->Fog.End == *params)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.End = *params;
+ UPDATE_FOG_SCALE(ctx);
+ break;
case GL_FOG_INDEX:
if (ctx->Fog.Index == *params)
return;
if (TEST_EQ_4V(ctx->Fog.Color, params))
return;
FLUSH_VERTICES(ctx, _NEW_FOG);
- ctx->Fog.Color[0] = params[0];
- ctx->Fog.Color[1] = params[1];
- ctx->Fog.Color[2] = params[2];
- ctx->Fog.Color[3] = params[3];
+ ctx->Fog.Color[0] = CLAMP(params[0], 0.0F, 1.0F);
+ ctx->Fog.Color[1] = CLAMP(params[1], 0.0F, 1.0F);
+ ctx->Fog.Color[2] = CLAMP(params[2], 0.0F, 1.0F);
+ ctx->Fog.Color[3] = CLAMP(params[3], 0.0F, 1.0F);
break;
case GL_FOG_COORDINATE_SOURCE_EXT: {
GLenum p = (GLenum) (GLint) *params;
(*ctx->Driver.Fogfv)( ctx, pname, params );
}
}
+
+
+/**********************************************************************/
+/***** Initialization *****/
+/**********************************************************************/
+
+void _mesa_init_fog( GLcontext * ctx )
+{
+ /* Fog group */
+ ctx->Fog.Enabled = GL_FALSE;
+ ctx->Fog.Mode = GL_EXP;
+ ASSIGN_4V( ctx->Fog.Color, 0.0, 0.0, 0.0, 0.0 );
+ ctx->Fog.Index = 0.0;
+ ctx->Fog.Density = 1.0;
+ ctx->Fog.Start = 0.0;
+ ctx->Fog.End = 1.0;
+ ctx->Fog.ColorSumEnabled = GL_FALSE;
+ ctx->Fog.FogCoordinateSource = GL_FRAGMENT_DEPTH_EXT;
+ ctx->Fog._Scale = 1.0f;
+}