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/* Copyright (c) 2001, Stanford University
* All rights reserved
*
* See the file LICENSE.txt for information on redistributing this software.
*/
#include <stdio.h>
#include "state.h"
#include "state/cr_statetypes.h"
#include "state_internals.h"
void crStateFogInit (CRContext *ctx)
{
CRFogState *f = &ctx->fog;
CRStateBits *sb = GetCurrentBits();
CRFogBits *fb = &(sb->fog);
GLcolorf black = {0.0f, 0.0f, 0.0f, 0.0f};
f->color = black;
RESET(fb->color, ctx->bitid);
f->density = 1.0f;
RESET(fb->density, ctx->bitid);
f->end = 1.0f;
RESET(fb->end, ctx->bitid);
f->start = 0.0f;
RESET(fb->start, ctx->bitid);
f->mode = GL_EXP;
RESET(fb->mode, ctx->bitid);
f->index = 0;
RESET(fb->index, ctx->bitid);
f->enable = GL_FALSE;
RESET(fb->enable, ctx->bitid);
#ifdef CR_NV_fog_distance
f->fogDistanceMode = GL_EYE_PLANE_ABSOLUTE_NV;
RESET(fb->fogDistanceMode, ctx->bitid);
#endif
#ifdef CR_EXT_fog_coord
f->fogCoordinateSource = GL_FRAGMENT_DEPTH_EXT;
RESET(fb->fogCoordinateSource, ctx->bitid);
#endif
RESET(fb->dirty, ctx->bitid);
}
void STATE_APIENTRY crStateFogf(GLenum pname, GLfloat param)
{
crStateFogfv( pname, ¶m );
}
void STATE_APIENTRY crStateFogi(GLenum pname, GLint param)
{
GLfloat f_param = (GLfloat) param;
crStateFogfv( pname, &f_param );
}
void STATE_APIENTRY crStateFogiv(GLenum pname, const GLint *param)
{
GLcolor f_color;
GLfloat f_param;
switch (pname)
{
case GL_FOG_MODE:
case GL_FOG_DENSITY:
case GL_FOG_START:
case GL_FOG_END:
case GL_FOG_INDEX:
f_param = (GLfloat) (*param);
crStateFogfv( pname, &f_param );
break;
case GL_FOG_COLOR:
f_color.r = ((GLfloat) param[0]) / ((GLfloat) CR_MAXINT);
f_color.g = ((GLfloat) param[1]) / ((GLfloat) CR_MAXINT);
f_color.b = ((GLfloat) param[2]) / ((GLfloat) CR_MAXINT);
f_color.a = ((GLfloat) param[3]) / ((GLfloat) CR_MAXINT);
crStateFogfv( pname, (GLfloat *) &f_color );
break;
#ifdef CR_NV_fog_distance
case GL_FOG_DISTANCE_MODE_NV:
f_param = (GLfloat) (*param);
crStateFogfv( pname, &f_param );
break;
#endif
#ifdef CR_EXT_fog_coord
case GL_FOG_COORDINATE_SOURCE_EXT:
f_param = (GLfloat) (*param);
crStateFogfv( pname, &f_param );
break;
#endif
default:
crStateError(__LINE__, __FILE__, GL_INVALID_VALUE, "Invalid glFog Param: %d", param);
return;
}
}
void STATE_APIENTRY crStateFogfv(GLenum pname, const GLfloat *param)
{
CRContext *g = GetCurrentContext();
CRFogState *f = &(g->fog);
CRStateBits *sb = GetCurrentBits();
CRFogBits *fb = &(sb->fog);
if (g->current.inBeginEnd)
{
crStateError(__LINE__, __FILE__, GL_INVALID_OPERATION, "glFogfv called in Begin/End");
return;
}
FLUSH();
switch (pname)
{
case GL_FOG_MODE:
{
GLenum e = (GLenum) *param;
if (e != GL_LINEAR && e != GL_EXP && e != GL_EXP2)
{
crStateError(__LINE__, __FILE__, GL_INVALID_ENUM, "Invalid param for glFog: %d", e);
return;
}
f->mode = e;
DIRTY(fb->mode, g->neg_bitid);
}
break;
case GL_FOG_DENSITY:
f->density = *param;
if (f->density < 0.0f)
{
f->density = 0.0f;
}
DIRTY(fb->density, g->neg_bitid);
break;
case GL_FOG_START:
f->start = *param;
DIRTY(fb->start, g->neg_bitid);
break;
case GL_FOG_END:
f->end = *param;
DIRTY(fb->end, g->neg_bitid);
break;
case GL_FOG_INDEX:
f->index = (GLint) *param;
DIRTY(fb->index, g->neg_bitid);
break;
case GL_FOG_COLOR:
f->color.r = param[0];
f->color.g = param[1];
f->color.b = param[2];
f->color.a = param[3];
DIRTY(fb->color, g->neg_bitid);
break;
#ifdef CR_NV_fog_distance
case GL_FOG_DISTANCE_MODE_NV:
if (g->extensions.NV_fog_distance)
{
if (param[0] != GL_EYE_RADIAL_NV &&
param[0] != GL_EYE_PLANE &&
param[0] != GL_EYE_PLANE_ABSOLUTE_NV )
{
crStateError(__LINE__, __FILE__, GL_INVALID_ENUM,
"Fogfv: GL_FOG_DISTANCE_MODE_NV called with illegal parameter: 0x%x", (GLenum) param[0]);
return;
}
f->fogDistanceMode = (GLenum) param[0];
DIRTY(fb->fogDistanceMode, g->neg_bitid);
}
else
{
crStateError(__LINE__, __FILE__, GL_INVALID_VALUE, "Invalid glFog Param: %d", param);
return;
}
break;
#endif
#ifdef CR_EXT_fog_coord
case GL_FOG_COORDINATE_SOURCE_EXT:
if (g->extensions.EXT_fog_coord)
{
if ((GLenum) param[0] != GL_FOG_COORDINATE_EXT &&
(GLenum) param[0] != GL_FRAGMENT_DEPTH_EXT)
{
crStateError(__LINE__, __FILE__, GL_INVALID_ENUM,
"Fogfv: GL_FOG_COORDINATE_SOURCE_EXT called with illegal parameter: 0x%x", (GLenum) param[0]);
return;
}
f->fogCoordinateSource = (GLenum) param[0];
DIRTY(fb->fogCoordinateSource, g->neg_bitid);
}
else
{
crStateError(__LINE__, __FILE__, GL_INVALID_VALUE, "Invalid glFog Param: 0x%x", (GLint) param[0]);
return;
}
break;
#endif
default:
crStateError(__LINE__, __FILE__, GL_INVALID_VALUE, "Invalid glFog Param: %d", param);
return;
}
DIRTY(fb->dirty, g->neg_bitid);
}
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