gallium: implement bounds checking for constant buffers

Plumb the constant buffer sizes down into the tgsi interpreter where
we can do bounds checking.  Optional debug code warns upon out-of-bounds
reading.  Plus add a few other assertions in the TGSI interpreter.

1 files changed, 9 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/draw/draw_context.c b/src/gallium/auxiliary/draw/draw_context.c
index c127f74188..995b675b9a 100644
--- a/src/gallium/auxiliary/draw/draw_context.c
+++ b/src/gallium/auxiliary/draw/draw_context.c
@@ -288,12 +288,19 @@ draw_set_mapped_constant_buffer(struct draw_context *draw,
                 shader_type == PIPE_SHADER_GEOMETRY);
    debug_assert(slot < PIPE_MAX_CONSTANT_BUFFERS);
 
-   if (shader_type == PIPE_SHADER_VERTEX) {
+   switch (shader_type) {
+   case PIPE_SHADER_VERTEX:
       draw->pt.user.vs_constants[slot] = buffer;
+      draw->pt.user.vs_constants_size[slot] = size;
       draw_vs_set_constants(draw, slot, buffer, size);
-   } else if (shader_type == PIPE_SHADER_GEOMETRY) {
+      break;
+   case PIPE_SHADER_GEOMETRY:
       draw->pt.user.gs_constants[slot] = buffer;
+      draw->pt.user.gs_constants_size[slot] = size;
       draw_gs_set_constants(draw, slot, buffer, size);
+      break;
+   default:
+      assert(0 && "invalid shader type in draw_set_mapped_constant_buffer");
    }
 }