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

1 files changed, 159 insertions, 0 deletions

diff --git a/mesalib/src/mesa/main/clip.c b/mesalib/src/mesa/main/clip.c
new file mode 100644
index 000000000..96c80e6ef
--- /dev/null
+++ b/mesalib/src/mesa/main/clip.c
@@ -0,0 +1,159 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.3
+ *
+ * Copyright (C) 1999-2005  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 "clip.h"
+#include "context.h"
+#include "macros.h"
+#include "mtypes.h"
+
+#include "math/m_matrix.h"
+
+
+
+/**********************************************************************/
+/*                     Get/Set User clip-planes.                      */
+/**********************************************************************/
+
+
+
+void GLAPIENTRY
+_mesa_ClipPlane( GLenum plane, const GLdouble *eq )
+{
+   GET_CURRENT_CONTEXT(ctx);
+   GLint p;
+   GLfloat equation[4];
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   p = (GLint) plane - (GLint) GL_CLIP_PLANE0;
+   if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) {
+      _mesa_error( ctx, GL_INVALID_ENUM, "glClipPlane" );
+      return;
+   }
+
+   equation[0] = (GLfloat) eq[0];
+   equation[1] = (GLfloat) eq[1];
+   equation[2] = (GLfloat) eq[2];
+   equation[3] = (GLfloat) eq[3];
+
+   /*
+    * The equation is transformed by the transpose of the inverse of the
+    * current modelview matrix and stored in the resulting eye coordinates.
+    *
+    * KW: Eqn is then transformed to the current clip space, where user
+    * clipping now takes place.  The clip-space equations are recalculated
+    * whenever the projection matrix changes.
+    */
+   if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top))
+      _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
+
+   _mesa_transform_vector( equation, equation,
+                           ctx->ModelviewMatrixStack.Top->inv );
+
+   if (TEST_EQ_4V(ctx->Transform.EyeUserPlane[p], equation))
+      return;
+
+   FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
+   COPY_4FV(ctx->Transform.EyeUserPlane[p], equation);
+
+   /* Update derived state.  This state also depends on the projection
+    * matrix, and is recalculated on changes to the projection matrix by
+    * code in _mesa_update_state().
+    */
+   if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
+      if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top))
+         _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
+
+      _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
+			   ctx->Transform.EyeUserPlane[p],
+			   ctx->ProjectionMatrixStack.Top->inv );
+   }
+
+   if (ctx->Driver.ClipPlane)
+      ctx->Driver.ClipPlane( ctx, plane, equation );
+}
+
+
+void GLAPIENTRY
+_mesa_GetClipPlane( GLenum plane, GLdouble *equation )
+{
+   GET_CURRENT_CONTEXT(ctx);
+   GLint p;
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   p = (GLint) (plane - GL_CLIP_PLANE0);
+   if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) {
+      _mesa_error( ctx, GL_INVALID_ENUM, "glGetClipPlane" );
+      return;
+   }
+
+   equation[0] = (GLdouble) ctx->Transform.EyeUserPlane[p][0];
+   equation[1] = (GLdouble) ctx->Transform.EyeUserPlane[p][1];
+   equation[2] = (GLdouble) ctx->Transform.EyeUserPlane[p][2];
+   equation[3] = (GLdouble) ctx->Transform.EyeUserPlane[p][3];
+}
+
+void GLAPIENTRY 
+_mesa_CullParameterfvEXT (GLenum cap, GLfloat *v)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   switch (cap) {
+   case GL_CULL_VERTEX_EYE_POSITION_EXT:
+      FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
+      COPY_4FV(ctx->Transform.CullEyePos, v);
+      
+      _mesa_transform_vector( ctx->Transform.CullObjPos, 
+			      ctx->Transform.CullEyePos,
+			      ctx->ModelviewMatrixStack.Top->inv );
+      break;
+
+   case GL_CULL_VERTEX_OBJECT_POSITION_EXT:
+      FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
+      COPY_4FV(ctx->Transform.CullObjPos, v);
+
+      _mesa_transform_vector( ctx->Transform.CullEyePos, 
+			      ctx->Transform.CullObjPos,
+			      ctx->ModelviewMatrixStack.Top->m );
+     break;
+   default:
+      _mesa_error( ctx, GL_INVALID_ENUM, "glCullParameterfvEXT" );
+   }
+}
+
+void GLAPIENTRY 
+_mesa_CullParameterdvEXT (GLenum cap, GLdouble *v)
+{
+   GLfloat f[4];
+   
+   f[0] = (GLfloat)v[0];
+   f[1] = (GLfloat)v[1];
+   f[2] = (GLfloat)v[2];
+   f[3] = (GLfloat)v[3];
+
+   _mesa_CullParameterfvEXT(cap, f);
+}
+