mesa/main: add USAGE_TRANSFORM_FEEDBACK_BUFFER flag to buffer UsageHistory

We will want to disable minmax index caching for buffers that are used in this
way.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/mesa/main/mtypes.h

@@ -1253,6 +1253,7 @@ typedef enum {
    USAGE_TEXTURE_BUFFER = 0x2,
    USAGE_ATOMIC_COUNTER_BUFFER = 0x4,
    USAGE_SHADER_STORAGE_BUFFER = 0x8,
+   USAGE_TRANSFORM_FEEDBACK_BUFFER = 0x10,
 } gl_buffer_usage;
 
 

src/mesa/main/transformfeedback.h

@@ -145,6 +145,9 @@ _mesa_set_transform_feedback_binding(struct gl_context *ctx,
    tfObj->BufferNames[index]   = bufObj->Name;
    tfObj->Offset[index]        = offset;
    tfObj->RequestedSize[index] = size;
+
+   if (bufObj != ctx->Shared->NullBufferObj)
+      bufObj->UsageHistory |= USAGE_TRANSFORM_FEEDBACK_BUFFER;
 }
 
 /*** GL_ARB_direct_state_access ***/