mesa: Make enable.c and get.c properly range check clip flags.

This is a follow-up to commit
2d686fe911a89fa477ee3848da41ebfb100500bf, which added decoding of
GL_CLIP_DISTANCE[67] to the _mesa_set_enable() function.  This patch
makes the following additional fixes:

- Uses GL_CLIP_DISTANCEi enums consistently within enable.c rather
  than the deprecated GL_CLIP_PLANEi enums.

- Generates an error if the user tries to access a clip flag that is
  unsupported by the hardware.

- Applies the same change to _mesa_IsEnabled(), so that querying clip
  flags using glIsEnabled() works properly.

- Applies corresponding changes to get.c, so that querying clip flags
  using glGet*() works properly.

Fixes piglit test clip-flag-behavior.

Reviewed-by: Brian Paul <brianp@vmware.com>

src/mesa/main/enable.c

@@ -304,7 +304,10 @@ _mesa_set_enable(struct gl_context *ctx, GLenum cap, GLboolean state)
       case GL_CLIP_DISTANCE6:
       case GL_CLIP_DISTANCE7:
          {
-            const GLuint p = cap - GL_CLIP_PLANE0;
+            const GLuint p = cap - GL_CLIP_DISTANCE0;
+
+            if (p >= ctx->Const.MaxClipPlanes)
+               goto invalid_enum_error;
 
             if ((ctx->Transform.ClipPlanesEnabled & (1 << p))
                 == ((GLuint) state << p))
@@ -1084,13 +1087,21 @@ _mesa_IsEnabled( GLenum cap )
 	 return ctx->Eval.AutoNormal;
       case GL_BLEND:
          return ctx->Color.BlendEnabled & 1;  /* return state for buffer[0] */
-      case GL_CLIP_PLANE0:
-      case GL_CLIP_PLANE1:
-      case GL_CLIP_PLANE2:
-      case GL_CLIP_PLANE3:
-      case GL_CLIP_PLANE4:
-      case GL_CLIP_PLANE5:
-	 return (ctx->Transform.ClipPlanesEnabled >> (cap - GL_CLIP_PLANE0)) & 1;
+      case GL_CLIP_DISTANCE0:
+      case GL_CLIP_DISTANCE1:
+      case GL_CLIP_DISTANCE2:
+      case GL_CLIP_DISTANCE3:
+      case GL_CLIP_DISTANCE4:
+      case GL_CLIP_DISTANCE5:
+      case GL_CLIP_DISTANCE6:
+      case GL_CLIP_DISTANCE7: {
+         const GLuint p = cap - GL_CLIP_DISTANCE0;
+
+         if (p >= ctx->Const.MaxClipPlanes)
+            goto invalid_enum_error;
+
+	 return (ctx->Transform.ClipPlanesEnabled >> p) & 1;
+      }
       case GL_COLOR_MATERIAL:
 	 return ctx->Light.ColorMaterialEnabled;
       case GL_CULL_FACE:

src/mesa/main/get.c

@@ -102,6 +102,8 @@ enum value_type {
    TYPE_BIT_3,
    TYPE_BIT_4,
    TYPE_BIT_5,
+   TYPE_BIT_6,
+   TYPE_BIT_7,
    TYPE_FLOAT,
    TYPE_FLOAT_2,
    TYPE_FLOAT_3,
@@ -134,6 +136,7 @@ enum value_extra {
    EXTRA_NEW_FRAG_CLAMP,
    EXTRA_VALID_DRAW_BUFFER,
    EXTRA_VALID_TEXTURE_UNIT,
+   EXTRA_VALID_CLIP_DISTANCE,
    EXTRA_FLUSH_CURRENT,
 };
 
@@ -189,6 +192,8 @@ union value {
 #define CONTEXT_BIT3(field) CONTEXT_FIELD(field, TYPE_BIT_3)
 #define CONTEXT_BIT4(field) CONTEXT_FIELD(field, TYPE_BIT_4)
 #define CONTEXT_BIT5(field) CONTEXT_FIELD(field, TYPE_BIT_5)
+#define CONTEXT_BIT6(field) CONTEXT_FIELD(field, TYPE_BIT_6)
+#define CONTEXT_BIT7(field) CONTEXT_FIELD(field, TYPE_BIT_7)
 #define CONTEXT_FLOAT(field) CONTEXT_FIELD(field, TYPE_FLOAT)
 #define CONTEXT_FLOAT2(field) CONTEXT_FIELD(field, TYPE_FLOAT_2)
 #define CONTEXT_FLOAT3(field) CONTEXT_FIELD(field, TYPE_FLOAT_3)
@@ -239,6 +244,11 @@ static const int extra_valid_texture_unit[] = {
    EXTRA_END
 };
 
+static const int extra_valid_clip_distance[] = {
+   EXTRA_VALID_CLIP_DISTANCE,
+   EXTRA_END
+};
+
 static const int extra_flush_current_valid_texture_unit[] = {
    EXTRA_FLUSH_CURRENT,
    EXTRA_VALID_TEXTURE_UNIT,
@@ -515,12 +525,14 @@ static const struct value_desc values[] = {
    { GL_ALPHA_TEST_FUNC, CONTEXT_ENUM(Color.AlphaFunc), NO_EXTRA },
    { GL_ALPHA_TEST_REF, LOC_CUSTOM, TYPE_FLOATN, 0, extra_new_frag_clamp },
    { GL_BLEND_DST, CONTEXT_ENUM(Color.Blend[0].DstRGB), NO_EXTRA },
-   { GL_CLIP_PLANE0, CONTEXT_BIT0(Transform.ClipPlanesEnabled), NO_EXTRA },
-   { GL_CLIP_PLANE1, CONTEXT_BIT1(Transform.ClipPlanesEnabled), NO_EXTRA },
-   { GL_CLIP_PLANE2, CONTEXT_BIT2(Transform.ClipPlanesEnabled), NO_EXTRA },
-   { GL_CLIP_PLANE3, CONTEXT_BIT3(Transform.ClipPlanesEnabled), NO_EXTRA },
-   { GL_CLIP_PLANE4, CONTEXT_BIT4(Transform.ClipPlanesEnabled), NO_EXTRA },
-   { GL_CLIP_PLANE5, CONTEXT_BIT5(Transform.ClipPlanesEnabled), NO_EXTRA },
+   { GL_CLIP_DISTANCE0, CONTEXT_BIT0(Transform.ClipPlanesEnabled), extra_valid_clip_distance },
+   { GL_CLIP_DISTANCE1, CONTEXT_BIT1(Transform.ClipPlanesEnabled), extra_valid_clip_distance },
+   { GL_CLIP_DISTANCE2, CONTEXT_BIT2(Transform.ClipPlanesEnabled), extra_valid_clip_distance },
+   { GL_CLIP_DISTANCE3, CONTEXT_BIT3(Transform.ClipPlanesEnabled), extra_valid_clip_distance },
+   { GL_CLIP_DISTANCE4, CONTEXT_BIT4(Transform.ClipPlanesEnabled), extra_valid_clip_distance },
+   { GL_CLIP_DISTANCE5, CONTEXT_BIT5(Transform.ClipPlanesEnabled), extra_valid_clip_distance },
+   { GL_CLIP_DISTANCE6, CONTEXT_BIT6(Transform.ClipPlanesEnabled), extra_valid_clip_distance },
+   { GL_CLIP_DISTANCE7, CONTEXT_BIT7(Transform.ClipPlanesEnabled), extra_valid_clip_distance },
    { GL_COLOR_MATERIAL, CONTEXT_BOOL(Light.ColorMaterialEnabled), NO_EXTRA },
    { GL_CURRENT_COLOR,
      CONTEXT_FIELD(Current.Attrib[VERT_ATTRIB_COLOR0][0], TYPE_FLOATN_4),
@@ -1798,6 +1810,13 @@ check_extra(struct gl_context *ctx, const char *func, const struct value_desc *d
 	    return GL_FALSE;
 	 }
 	 break;
+      case EXTRA_VALID_CLIP_DISTANCE:
+	 if (d->pname - GL_CLIP_DISTANCE0 >= ctx->Const.MaxClipPlanes) {
+	    _mesa_error(ctx, GL_INVALID_ENUM, "%s(clip distance %u)",
+			func, d->pname - GL_CLIP_DISTANCE0);
+	    return GL_FALSE;
+	 }
+	 break;
       case EXTRA_END:
 	 break;
       default: /* *e is a offset into the extension struct */
@@ -1986,6 +2005,8 @@ _mesa_GetBooleanv(GLenum pname, GLboolean *params)
    case TYPE_BIT_3:
    case TYPE_BIT_4:
    case TYPE_BIT_5:
+   case TYPE_BIT_6:
+   case TYPE_BIT_7:
       shift = d->type - TYPE_BIT_0;
       params[0] = (*(GLbitfield *) p >> shift) & 1;
       break;
@@ -2073,6 +2094,8 @@ _mesa_GetFloatv(GLenum pname, GLfloat *params)
    case TYPE_BIT_3:
    case TYPE_BIT_4:
    case TYPE_BIT_5:
+   case TYPE_BIT_6:
+   case TYPE_BIT_7:
       shift = d->type - TYPE_BIT_0;
       params[0] = BOOLEAN_TO_FLOAT((*(GLbitfield *) p >> shift) & 1);
       break;
@@ -2166,6 +2189,8 @@ _mesa_GetIntegerv(GLenum pname, GLint *params)
    case TYPE_BIT_3:
    case TYPE_BIT_4:
    case TYPE_BIT_5:
+   case TYPE_BIT_6:
+   case TYPE_BIT_7:
       shift = d->type - TYPE_BIT_0;
       params[0] = (*(GLbitfield *) p >> shift) & 1;
       break;
@@ -2260,6 +2285,8 @@ _mesa_GetInteger64v(GLenum pname, GLint64 *params)
    case TYPE_BIT_3:
    case TYPE_BIT_4:
    case TYPE_BIT_5:
+   case TYPE_BIT_6:
+   case TYPE_BIT_7:
       shift = d->type - TYPE_BIT_0;
       params[0] = (*(GLbitfield *) p >> shift) & 1;
       break;
@@ -2348,6 +2375,8 @@ _mesa_GetDoublev(GLenum pname, GLdouble *params)
    case TYPE_BIT_3:
    case TYPE_BIT_4:
    case TYPE_BIT_5:
+   case TYPE_BIT_6:
+   case TYPE_BIT_7:
       shift = d->type - TYPE_BIT_0;
       params[0] = (*(GLbitfield *) p >> shift) & 1;
       break;
@@ -2618,6 +2647,8 @@ _mesa_GetFixedv(GLenum pname, GLfixed *params)
    case TYPE_BIT_3:
    case TYPE_BIT_4:
    case TYPE_BIT_5:
+   case TYPE_BIT_6:
+   case TYPE_BIT_7:
       shift = d->type - TYPE_BIT_0;
       params[0] = BOOLEAN_TO_FIXED((*(GLbitfield *) p >> shift) & 1);
       break;