4 files changed, 15 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_cb_readpixels.c b/src/mesa/state_tracker/st_cb_readpixels.c
index b524738ae29..bfed988701a 100644
--- a/src/mesa/state_tracker/st_cb_readpixels.c
+++ b/src/mesa/state_tracker/st_cb_readpixels.c
@@ -83,6 +83,10 @@ st_readpixels(struct gl_context *ctx, GLint x, GLint y,
    st_validate_state(st);
    st_flush_bitmap_cache(st);
 
+   if (!st->prefer_blit_based_texture_transfer) {
+      goto fallback;
+   }
+
    /* This must be done after state validation. */
    src = strb->texture;
 
diff --git a/src/mesa/state_tracker/st_cb_texture.c b/src/mesa/state_tracker/st_cb_texture.c
index 7307c6052c5..94fbbf7bed8 100644
--- a/src/mesa/state_tracker/st_cb_texture.c
+++ b/src/mesa/state_tracker/st_cb_texture.c
@@ -608,6 +608,10 @@ st_TexSubImage(struct gl_context *ctx, GLuint dims,
    unsigned bind;
    GLubyte *map;
 
+   if (!st->prefer_blit_based_texture_transfer) {
+      goto fallback;
+   }
+
    if (!dst) {
       goto fallback;
    }
@@ -860,6 +864,10 @@ st_GetTexImage(struct gl_context * ctx,
    ubyte *map = NULL;
    boolean done = FALSE;
 
+   if (!st->prefer_blit_based_texture_transfer) {
+      goto fallback;
+   }
+
    if (!stImage->pt) {
       goto fallback;
    }
diff --git a/src/mesa/state_tracker/st_context.c b/src/mesa/state_tracker/st_context.c
index e2d074d14a4..cc87f2bb38d 100644
--- a/src/mesa/state_tracker/st_context.c
+++ b/src/mesa/state_tracker/st_context.c
@@ -182,6 +182,8 @@ st_create_context_priv( struct gl_context *ctx, struct pipe_context *pipe,
    st->has_stencil_export =
       screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT);
    st->has_shader_model3 = screen->get_param(screen, PIPE_CAP_SM3);
+   st->prefer_blit_based_texture_transfer = screen->get_param(screen,
+                              PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER);
 
    st->needs_texcoord_semantic =
       screen->get_param(screen, PIPE_CAP_TGSI_TEXCOORD);
diff --git a/src/mesa/state_tracker/st_context.h b/src/mesa/state_tracker/st_context.h
index c6c68adcfb2..8786a036ff4 100644
--- a/src/mesa/state_tracker/st_context.h
+++ b/src/mesa/state_tracker/st_context.h
@@ -84,6 +84,7 @@ struct st_context
    boolean has_stencil_export; /**< can do shader stencil export? */
    boolean has_time_elapsed;
    boolean has_shader_model3;
+   boolean prefer_blit_based_texture_transfer;
 
    boolean needs_texcoord_semantic;