mesa: replace for loop with bitshifting in supported_buffer_bitmask()

Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index 70c2a21b473110c8a7cbfc0ca298d404275cc64d..26dafd1b786ac07e4576414ab5d2f407dccb9216 100644 (file)
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -58,10 +58,7 @@ supported_buffer_bitmask(const struct gl_context *ctx,
 
    if (_mesa_is_user_fbo(fb)) {
       /* A user-created renderbuffer */
-      GLuint i;
-      for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
-         mask |= (BUFFER_BIT_COLOR0 << i);
-      }
+      mask = ((1 << ctx->Const.MaxColorAttachments) - 1) << BUFFER_COLOR0;
    }
    else {
       /* A window system framebuffer */