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-rw-r--r--src/gallium/drivers/nv50/nv50_shader_state.c3
-rw-r--r--src/gallium/drivers/r600/r600_state.c7
2 files changed, 10 insertions, 0 deletions
diff --git a/src/gallium/drivers/nv50/nv50_shader_state.c b/src/gallium/drivers/nv50/nv50_shader_state.c
index 6c41e8f4561..306aa81d985 100644
--- a/src/gallium/drivers/nv50/nv50_shader_state.c
+++ b/src/gallium/drivers/nv50/nv50_shader_state.c
@@ -39,6 +39,9 @@ nv50_transfer_constbuf(struct nv50_context *nv50,
uint32_t *map;
unsigned count, start;
+ if (buf == NULL)
+ return;
+
map = pipe_buffer_map(pipe, buf, PIPE_TRANSFER_READ, &transfer);
if (!map)
return;
diff --git a/src/gallium/drivers/r600/r600_state.c b/src/gallium/drivers/r600/r600_state.c
index b3e0d493217..ccd74210b78 100644
--- a/src/gallium/drivers/r600/r600_state.c
+++ b/src/gallium/drivers/r600/r600_state.c
@@ -1018,6 +1018,13 @@ static void r600_set_constant_buffer(struct pipe_context *ctx, uint shader, uint
struct r600_pipe_context *rctx = (struct r600_pipe_context *)ctx;
struct r600_resource *rbuffer = (struct r600_resource*)buffer;
+ /* Note that the state tracker can unbind constant buffers by
+ * passing NULL here.
+ */
+ if (buffer == NULL) {
+ return;
+ }
+
switch (shader) {
case PIPE_SHADER_VERTEX:
rctx->vs_const_buffer.nregs = 0;