-/* $Id: fog.c,v 1.30 2000/11/22 07:32:17 joukj Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 3.5
+ * Version: 5.1
*
- * Copyright (C) 1999-2000 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"),
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
-#ifdef PC_HEADER
-#include "all.h"
-#else
#include "glheader.h"
#include "colormac.h"
#include "context.h"
#include "fog.h"
+#include "macros.h"
#include "mtypes.h"
-#endif
-void
+void GLAPIENTRY
_mesa_Fogf(GLenum pname, GLfloat param)
{
- _mesa_Fogfv(pname, ¶m);
+ GLfloat fparam[4];
+ fparam[0] = param;
+ fparam[1] = fparam[2] = fparam[3] = 0.0F;
+ _mesa_Fogfv(pname, fparam);
}
-void
+void GLAPIENTRY
_mesa_Fogi(GLenum pname, GLint param )
{
- GLfloat fparam = (GLfloat) param;
- _mesa_Fogfv(pname, &fparam);
+ GLfloat fparam[4];
+ fparam[0] = (GLfloat) param;
+ fparam[1] = fparam[2] = fparam[3] = 0.0F;
+ _mesa_Fogfv(pname, fparam);
}
-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
+/**
+ * Update the gl_fog_attrib::_Scale field.
+ */
+static void
+update_fog_scale(struct gl_context *ctx)
+{
+ if (ctx->Fog.End == ctx->Fog.Start)
+ ctx->Fog._Scale = 1.0f;
+ else
+ ctx->Fog._Scale = 1.0f / (ctx->Fog.End - ctx->Fog.Start);
+}
+
+
+void GLAPIENTRY
_mesa_Fogfv( GLenum pname, const GLfloat *params )
{
GET_CURRENT_CONTEXT(ctx);
GLenum m;
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glFog");
-
switch (pname) {
case GL_FOG_MODE:
m = (GLenum) (GLint) *params;
- if (m==GL_LINEAR || m==GL_EXP || m==GL_EXP2) {
- ctx->Fog.Mode = m;
- }
- else {
- gl_error( ctx, GL_INVALID_ENUM, "glFog" );
+ switch (m) {
+ case GL_LINEAR:
+ case GL_EXP:
+ case GL_EXP2:
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
return;
}
+ if (ctx->Fog.Mode == m)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.Mode = m;
break;
case GL_FOG_DENSITY:
if (*params<0.0) {
- gl_error( ctx, GL_INVALID_VALUE, "glFog" );
+ _mesa_error( ctx, GL_INVALID_VALUE, "glFog" );
return;
}
- else {
- ctx->Fog.Density = *params;
- }
+ if (ctx->Fog.Density == *params)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.Density = *params;
break;
case GL_FOG_START:
- 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:
- 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:
- ctx->Fog.Index = *params;
+ if (ctx->API != API_OPENGL_COMPAT)
+ goto invalid_pname;
+ if (ctx->Fog.Index == *params)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.Index = *params;
break;
case GL_FOG_COLOR:
- ctx->Fog.Color[0] = params[0];
- ctx->Fog.Color[1] = params[1];
- ctx->Fog.Color[2] = params[2];
- ctx->Fog.Color[3] = params[3];
+ if (TEST_EQ_4V(ctx->Fog.Color, params))
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.ColorUnclamped[0] = params[0];
+ ctx->Fog.ColorUnclamped[1] = params[1];
+ ctx->Fog.ColorUnclamped[2] = params[2];
+ ctx->Fog.ColorUnclamped[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;
- if (p == GL_FOG_COORDINATE_EXT || p == GL_FRAGMENT_DEPTH_EXT)
- ctx->Fog.FogCoordinateSource = p;
- else
- gl_error( ctx, GL_INVALID_ENUM, "glFog" );
+ GLenum p = (GLenum) (GLint) *params;
+ if (ctx->API != API_OPENGL_COMPAT || !ctx->Extensions.EXT_fog_coord ||
+ (p != GL_FOG_COORDINATE_EXT && p != GL_FRAGMENT_DEPTH_EXT)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glFog");
+ return;
+ }
+ if (ctx->Fog.FogCoordinateSource == p)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.FogCoordinateSource = p;
+ break;
+ }
+ case GL_FOG_DISTANCE_MODE_NV: {
+ GLenum p = (GLenum) (GLint) *params;
+ if (ctx->API != API_OPENGL_COMPAT || !ctx->Extensions.NV_fog_distance ||
+ (p != GL_EYE_RADIAL_NV && p != GL_EYE_PLANE && p != GL_EYE_PLANE_ABSOLUTE_NV)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glFog");
+ return;
+ }
+ if (ctx->Fog.FogDistanceMode == p)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.FogDistanceMode = p;
break;
}
default:
- gl_error( ctx, GL_INVALID_ENUM, "glFog" );
- return;
+ goto invalid_pname;
}
if (ctx->Driver.Fogfv) {
(*ctx->Driver.Fogfv)( ctx, pname, params );
}
- ctx->NewState |= _NEW_FOG;
+ return;
+
+invalid_pname:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
+ return;
}
+/**********************************************************************/
+/***** Initialization *****/
+/**********************************************************************/
+
+void _mesa_init_fog( struct gl_context * 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 );
+ ASSIGN_4V( ctx->Fog.ColorUnclamped, 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;
+ ctx->Fog.FogDistanceMode = GL_EYE_PLANE_ABSOLUTE_NV;
+}
projects / mesa.git / blobdiff