vbo: pass only either uint32_t or uint64_t into ATTR_UNION

This makes the next commit possible.

Reviewed-by: Mathias Fröhlich <mathias.froehlich@web.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3766>

src/mesa/main/macros.h

@@ -194,6 +194,20 @@ static inline fi_type FLOAT_AS_UNION(GLfloat f)
    return tmp;
 }
 
+static inline uint64_t DOUBLE_AS_UINT64(double d)
+{
+   union {
+      double d;
+      uint64_t u64;
+   } tmp;
+   tmp.d = d;
+   return tmp.u64;
+}
+
+/* First sign-extend x, then return uint32_t. */
+#define INT_AS_UINT(x) ((uint32_t)((int32_t)(x)))
+#define FLOAT_AS_UINT(x) (FLOAT_AS_UNION(x).u)
+
 /**
  * Convert a floating point value to an unsigned fixed point value.
  *

src/mesa/vbo/vbo_attrib_tmp.h

@@ -32,16 +32,17 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 /* ATTR */
 #define ATTRI( A, N, V0, V1, V2, V3 ) \
-    ATTR_UNION(A, N, GL_INT, fi_type, INT_AS_UNION(V0), INT_AS_UNION(V1), \
-        INT_AS_UNION(V2), INT_AS_UNION(V3))
+    ATTR_UNION(A, N, GL_INT, uint32_t, INT_AS_UINT(V0), INT_AS_UINT(V1), \
+        INT_AS_UINT(V2), INT_AS_UINT(V3))
 #define ATTRUI( A, N, V0, V1, V2, V3 ) \
-    ATTR_UNION(A, N, GL_UNSIGNED_INT, fi_type, UINT_AS_UNION(V0), UINT_AS_UNION(V1), \
-        UINT_AS_UNION(V2), UINT_AS_UNION(V3))
+    ATTR_UNION(A, N, GL_UNSIGNED_INT, uint32_t, (uint32_t)(V0), (uint32_t)(V1), \
+        (uint32_t)(V2), (uint32_t)(V3))
 #define ATTRF( A, N, V0, V1, V2, V3 ) \
-    ATTR_UNION(A, N, GL_FLOAT, fi_type, FLOAT_AS_UNION(V0), FLOAT_AS_UNION(V1),\
-        FLOAT_AS_UNION(V2), FLOAT_AS_UNION(V3))
+    ATTR_UNION(A, N, GL_FLOAT, uint32_t, FLOAT_AS_UINT(V0), FLOAT_AS_UINT(V1),\
+        FLOAT_AS_UINT(V2), FLOAT_AS_UINT(V3))
 #define ATTRD( A, N, V0, V1, V2, V3 ) \
-    ATTR_UNION(A, N, GL_DOUBLE, double, V0, V1, V2, V3)
+    ATTR_UNION(A, N, GL_DOUBLE, uint64_t, DOUBLE_AS_UINT64(V0), \
+        DOUBLE_AS_UINT64(V1), DOUBLE_AS_UINT64(V2), DOUBLE_AS_UINT64(V3))
 #define ATTRUI64( A, N, V0, V1, V2, V3 ) \
     ATTR_UNION(A, N, GL_UNSIGNED_INT64_ARB, uint64_t, V0, V1, V2, V3)
 

src/mesa/vbo/vbo_exec_api.c

@@ -460,7 +460,7 @@ is_vertex_position(const struct gl_context *ctx, GLuint index)
  * \param A  VBO_ATTRIB_x attribute index
  * \param N  attribute size (1..4)
  * \param T  type (GL_FLOAT, GL_DOUBLE, GL_INT, GL_UNSIGNED_INT)
- * \param C  cast type (fi_type or double)
+ * \param C  cast type (uint32_t or uint64_t)
  * \param V0, V1, v2, V3  attribute value
  */
 #define ATTR_UNION(A, N, T, C, V0, V1, V2, V3)                          \