gallium: add void *user_buffer to pipe_constant_buffer

This reduces CPU overhead when updating constants.

3 files changed, 22 insertions, 3 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_context.h b/src/gallium/drivers/llvmpipe/lp_context.h
index 438fc887083..d4750705b43 100644
--- a/src/gallium/drivers/llvmpipe/lp_context.h
+++ b/src/gallium/drivers/llvmpipe/lp_context.h
@@ -155,6 +155,12 @@ extern unsigned llvmpipe_variant_count;
 struct pipe_context *
 llvmpipe_create_context( struct pipe_screen *screen, void *priv );
 
+struct pipe_resource *
+llvmpipe_user_buffer_create(struct pipe_screen *screen,
+                            void *ptr,
+                            unsigned bytes,
+			    unsigned bind_flags);
+
 
 static INLINE struct llvmpipe_context *
 llvmpipe_context( struct pipe_context *pipe )
diff --git a/src/gallium/drivers/llvmpipe/lp_state_fs.c b/src/gallium/drivers/llvmpipe/lp_state_fs.c
index 7a6c1ab5bc7..ec94190649c 100644
--- a/src/gallium/drivers/llvmpipe/lp_state_fs.c
+++ b/src/gallium/drivers/llvmpipe/lp_state_fs.c
@@ -1173,8 +1173,17 @@ llvmpipe_set_constant_buffer(struct pipe_context *pipe,
 {
    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
    struct pipe_resource *constants = cb ? cb->buffer : NULL;
-   unsigned size = constants ? constants->width0 : 0;
-   const void *data = constants ? llvmpipe_resource_data(constants) : NULL;
+   unsigned size;
+   const void *data;
+
+   if (cb && cb->user_buffer) {
+      constants = llvmpipe_user_buffer_create(pipe->screen, cb->user_buffer,
+                                              cb->buffer_size,
+                                              PIPE_BIND_CONSTANT_BUFFER);
+   }
+
+   size = constants ? constants->width0 : 0;
+   data = constants ? llvmpipe_resource_data(constants) : NULL;
 
    assert(shader < PIPE_SHADER_TYPES);
    assert(index < PIPE_MAX_CONSTANT_BUFFERS);
@@ -1194,6 +1203,10 @@ llvmpipe_set_constant_buffer(struct pipe_context *pipe,
    }
 
    llvmpipe->dirty |= LP_NEW_CONSTANTS;
+
+   if (cb && cb->user_buffer) {
+      pipe_resource_reference(&constants, NULL);
+   }
 }
 
 
diff --git a/src/gallium/drivers/llvmpipe/lp_texture.c b/src/gallium/drivers/llvmpipe/lp_texture.c
index f6a1ec26bc5..958a8127b89 100644
--- a/src/gallium/drivers/llvmpipe/lp_texture.c
+++ b/src/gallium/drivers/llvmpipe/lp_texture.c
@@ -748,7 +748,7 @@ llvmpipe_is_resource_referenced( struct pipe_context *pipe,
 /**
  * Create buffer which wraps user-space data.
  */
-static struct pipe_resource *
+struct pipe_resource *
 llvmpipe_user_buffer_create(struct pipe_screen *screen,
                             void *ptr,
                             unsigned bytes,