6 files changed, 13 insertions, 8 deletions
diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index 2189b3173e7..ad6096baac8 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -697,6 +697,11 @@ find_custom_value(struct gl_context *ctx, const struct value_desc *d, union valu
       v->value_int_4[3] = ctx->Viewport.Height;
       break;
 
+   case GL_DEPTH_RANGE:
+      v->value_double_2[0] = ctx->Viewport.Near;
+      v->value_double_2[1] = ctx->Viewport.Far;
+      break;
+
    case GL_ACTIVE_STENCIL_FACE_EXT:
       v->value_enum = ctx->Stencil.ActiveFace ? GL_BACK : GL_FRONT;
       break;
diff --git a/src/mesa/main/get_hash_params.py b/src/mesa/main/get_hash_params.py
index 6fcd4f622cd..8e2fdaec956 100644
--- a/src/mesa/main/get_hash_params.py
+++ b/src/mesa/main/get_hash_params.py
@@ -11,7 +11,7 @@ descriptor=[
   [ "DEPTH_BITS", "BUFFER_INT(Visual.depthBits), extra_new_buffers" ],
   [ "DEPTH_CLEAR_VALUE", "CONTEXT_FIELD(Depth.Clear, TYPE_DOUBLEN), NO_EXTRA" ],
   [ "DEPTH_FUNC", "CONTEXT_ENUM(Depth.Func), NO_EXTRA" ],
-  [ "DEPTH_RANGE", "CONTEXT_FIELD(Viewport.Near, TYPE_FLOATN_2), NO_EXTRA" ],
+  [ "DEPTH_RANGE", "LOC_CUSTOM, TYPE_DOUBLEN_2, 0, NO_EXTRA" ],
   [ "DEPTH_TEST", "CONTEXT_BOOL(Depth.Test), NO_EXTRA" ],
   [ "DEPTH_WRITEMASK", "CONTEXT_BOOL(Depth.Mask), NO_EXTRA" ],
   [ "DITHER", "CONTEXT_BOOL(Color.DitherFlag), NO_EXTRA" ],
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 9dbfa6bfbc6..1d5dd4816a7 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1434,7 +1434,7 @@ struct gl_viewport_attrib
 {
    GLint X, Y;			/**< position */
    GLsizei Width, Height;	/**< size */
-   GLfloat Near, Far;		/**< Depth buffer range */
+   GLdouble Near, Far;		/**< Depth buffer range */
    GLmatrix _WindowMap;		/**< Mapping transformation as a matrix. */
 };
 
diff --git a/src/mesa/main/viewport.c b/src/mesa/main/viewport.c
index 3bc89ab030a..8eede518f9d 100644
--- a/src/mesa/main/viewport.c
+++ b/src/mesa/main/viewport.c
@@ -127,8 +127,8 @@ _mesa_DepthRange(GLclampd nearval, GLclampd farval)
        ctx->Viewport.Far == farval)
       return;
 
-   ctx->Viewport.Near = (GLfloat) CLAMP(nearval, 0.0, 1.0);
-   ctx->Viewport.Far = (GLfloat) CLAMP(farval, 0.0, 1.0);
+   ctx->Viewport.Near = CLAMP(nearval, 0.0, 1.0);
+   ctx->Viewport.Far = CLAMP(farval, 0.0, 1.0);
    ctx->NewState |= _NEW_VIEWPORT;
 
 #if 1
diff --git a/src/mesa/math/m_matrix.c b/src/mesa/math/m_matrix.c
index 274f969d2e4..38fa51ec1b7 100644
--- a/src/mesa/math/m_matrix.c
+++ b/src/mesa/math/m_matrix.c
@@ -1111,14 +1111,14 @@ _math_matrix_translate( GLmatrix *mat, GLfloat x, GLfloat y, GLfloat z )
  */
 void
 _math_matrix_viewport(GLmatrix *m, GLint x, GLint y, GLint width, GLint height,
-                      GLfloat zNear, GLfloat zFar, GLfloat depthMax)
+                      GLdouble zNear, GLdouble zFar, GLdouble depthMax)
 {
    m->m[MAT_SX] = (GLfloat) width / 2.0F;
    m->m[MAT_TX] = m->m[MAT_SX] + x;
    m->m[MAT_SY] = (GLfloat) height / 2.0F;
    m->m[MAT_TY] = m->m[MAT_SY] + y;
-   m->m[MAT_SZ] = depthMax * ((zFar - zNear) / 2.0F);
-   m->m[MAT_TZ] = depthMax * ((zFar - zNear) / 2.0F + zNear);
+   m->m[MAT_SZ] = (GLfloat) (depthMax * ((zFar - zNear) / 2.0));
+   m->m[MAT_TZ] = (GLfloat) (depthMax * ((zFar - zNear) / 2.0 + zNear));
    m->flags = MAT_FLAG_GENERAL_SCALE | MAT_FLAG_TRANSLATION;
    m->type = MATRIX_3D_NO_ROT;
 }
diff --git a/src/mesa/math/m_matrix.h b/src/mesa/math/m_matrix.h
index 2b097cb3130..fc65f84dcf4 100644
--- a/src/mesa/math/m_matrix.h
+++ b/src/mesa/math/m_matrix.h
@@ -123,7 +123,7 @@ _math_matrix_frustum( GLmatrix *mat,
 
 extern void
 _math_matrix_viewport(GLmatrix *m, GLint x, GLint y, GLint width, GLint height,
-                      GLfloat zNear, GLfloat zFar, GLfloat depthMax);
+                      GLdouble zNear, GLdouble zFar, GLdouble depthMax);
 
 extern void
 _math_matrix_set_identity( GLmatrix *dest );