svn merge ^/branches/released . --username marha

1 files changed, 188 insertions, 0 deletions

diff --git a/mesalib/src/mesa/main/fog.c b/mesalib/src/mesa/main/fog.c
new file mode 100644
index 000000000..4323d3db8
--- /dev/null
+++ b/mesalib/src/mesa/main/fog.c
@@ -0,0 +1,188 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  5.1
+ *
+ * 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"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of 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
+ * 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.
+ */
+
+
+#include "glheader.h"
+#include "colormac.h"
+#include "context.h"
+#include "fog.h"
+#include "mtypes.h"
+
+
+
+void GLAPIENTRY
+_mesa_Fogf(GLenum pname, GLfloat param)
+{
+   _mesa_Fogfv(pname, &param);
+}
+
+
+void GLAPIENTRY
+_mesa_Fogi(GLenum pname, GLint param )
+{
+   GLfloat fparam = (GLfloat) param;
+   _mesa_Fogfv(pname, &fparam);
+}
+
+
+void GLAPIENTRY
+_mesa_Fogiv(GLenum pname, const GLint *params )
+{
+   GLfloat p[4];
+   switch (pname) {
+      case GL_FOG_MODE:
+      case GL_FOG_DENSITY:
+      case GL_FOG_START:
+      case GL_FOG_END:
+      case GL_FOG_INDEX:
+      case GL_FOG_COORDINATE_SOURCE_EXT:
+	 p[0] = (GLfloat) *params;
+	 break;
+      case GL_FOG_COLOR:
+	 p[0] = INT_TO_FLOAT( params[0] );
+	 p[1] = INT_TO_FLOAT( params[1] );
+	 p[2] = INT_TO_FLOAT( params[2] );
+	 p[3] = INT_TO_FLOAT( params[3] );
+	 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);
+}
+
+
+#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);
+   GLenum m;
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   switch (pname) {
+      case GL_FOG_MODE:
+         m = (GLenum) (GLint) *params;
+	 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) {
+	    _mesa_error( ctx, GL_INVALID_VALUE, "glFog" );
+            return;
+	 }
+	 if (ctx->Fog.Density == *params)
+	    return;
+	 FLUSH_VERTICES(ctx, _NEW_FOG);
+	 ctx->Fog.Density = *params;
+	 break;
+      case GL_FOG_START:
+         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;
+         UPDATE_FOG_SCALE(ctx);
+         break;
+      case GL_FOG_INDEX:
+ 	 if (ctx->Fog.Index == *params)
+	    return;
+	 FLUSH_VERTICES(ctx, _NEW_FOG);
+ 	 ctx->Fog.Index = *params;
+	 break;
+      case GL_FOG_COLOR:
+	 if (TEST_EQ_4V(ctx->Fog.Color, params))
+	    return;
+	 FLUSH_VERTICES(ctx, _NEW_FOG);
+	 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 (!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;
+      }
+      default:
+         _mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
+         return;
+   }
+
+   if (ctx->Driver.Fogfv) {
+      (*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;
+}