gallium: add void *user_buffer to pipe_constant_buffer

This reduces CPU overhead when updating constants.

1 files changed, 15 insertions, 2 deletions

diff --git a/src/gallium/drivers/softpipe/sp_state_shader.c b/src/gallium/drivers/softpipe/sp_state_shader.c
index af05d0d..4056d2d 100644
--- a/src/gallium/drivers/softpipe/sp_state_shader.c
+++ b/src/gallium/drivers/softpipe/sp_state_shader.c
@@ -346,8 +346,17 @@ softpipe_set_constant_buffer(struct pipe_context *pipe,
 {
    struct softpipe_context *softpipe = softpipe_context(pipe);
    struct pipe_resource *constants = cb ? cb->buffer : NULL;
-   unsigned size = constants ? constants->width0 : 0;
-   const void *data = constants ? softpipe_resource(constants)->data : NULL;
+   unsigned size;
+   const void *data;
+
+   if (cb && cb->user_buffer) {
+      constants = softpipe_user_buffer_create(pipe->screen, cb->user_buffer,
+                                              cb->buffer_size,
+                                              PIPE_BIND_CONSTANT_BUFFER);
+   }
+
+   size = constants ? constants->width0 : 0;
+   data = constants ? softpipe_resource(constants)->data : NULL;
 
    assert(shader < PIPE_SHADER_TYPES);
 
@@ -364,6 +373,10 @@ softpipe_set_constant_buffer(struct pipe_context *pipe,
    softpipe->const_buffer_size[shader][index] = size;
 
    softpipe->dirty |= SP_NEW_CONSTANTS;
+
+   if (cb && cb->user_buffer) {
+      pipe_resource_reference(&constants, NULL);
+   }
 }