gallium: basic and initial implementation of the stream output interface

aka transform feedback

3 files changed, 21 insertions, 0 deletions

diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index 3e082bef2ff..0267ed8fa4a 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -186,6 +186,11 @@ struct pipe_context {
    void   (*bind_vertex_elements_state)(struct pipe_context *, void *);
    void   (*delete_vertex_elements_state)(struct pipe_context *, void *);
 
+   void * (*create_stream_output_state)(struct pipe_context *,
+                                        const struct pipe_stream_output_state *);
+   void   (*bind_stream_output_state)(struct pipe_context *, void *);
+   void   (*delete_stream_output_state)(struct pipe_context*, void*);
+
    /*@}*/
 
    /**
@@ -232,6 +237,13 @@ struct pipe_context {
                                unsigned num_buffers,
                                const struct pipe_vertex_buffer * );
 
+   void (*set_stream_output_buffers)(struct pipe_context *,
+                                     struct pipe_resource **buffers,
+                                     int *offsets, /*array of offsets
+                                                     from the start of each
+                                                     of the buffers */
+                                     int num_buffers);
+
    /*@}*/
 
 
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index b00677425ce..be42c272221 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -288,6 +288,7 @@ enum pipe_transfer_usage {
 #define PIPE_BIND_DISPLAY_TARGET       (1 << 8) /* flush_front_buffer */
 #define PIPE_BIND_TRANSFER_WRITE       (1 << 9) /* get_transfer */
 #define PIPE_BIND_TRANSFER_READ        (1 << 10) /* get_transfer */
+#define PIPE_BIND_STREAM_OUTPUT        (1 << 11) /* set_stream_output_buffers */
 #define PIPE_BIND_CUSTOM               (1 << 16) /* state-tracker/winsys usages */
 
 /* The first two flags above were previously part of the amorphous
@@ -322,6 +323,7 @@ enum pipe_transfer_usage {
 #define PIPE_USAGE_STATIC         2 /* same as immutable?? */
 #define PIPE_USAGE_IMMUTABLE      3 /* no change after first upload */
 #define PIPE_USAGE_STREAM         4 /* upload, draw, upload, draw */
+#define PIPE_USAGE_STAGING        5 /* supports data transfers from the GPU to the CPU */
 
 
 /* These are intended to be used in calls to is_format_supported, but
diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 5255b2003f8..33ee066c0c9 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -63,6 +63,7 @@ extern "C" {
 #define PIPE_MAX_SHADER_INPUTS    16
 #define PIPE_MAX_SHADER_OUTPUTS   16
 #define PIPE_MAX_TEXTURE_LEVELS   16
+#define PIPE_MAX_SO_BUFFERS        4
 
 
 struct pipe_reference
@@ -345,6 +346,12 @@ struct pipe_resource
    unsigned flags;	     /**< bitmask of PIPE_RESOURCE_FLAG_x */
 };
 
+struct pipe_stream_output_state
+{
+   /**< format for each output */
+   enum pipe_format format[PIPE_MAX_SHADER_OUTPUTS];
+   int num_outputs;
+};
 
 /**
  * Extra indexing info for (cube) texture resources.