gallium: WIP: Introduce sampler views.

3 files changed, 45 insertions, 6 deletions

diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index f82b77903e9..0c265484e9a 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -208,13 +208,13 @@ struct pipe_context {
    void (*set_viewport_state)( struct pipe_context *,
                                const struct pipe_viewport_state * );
 
-   void (*set_fragment_sampler_textures)(struct pipe_context *,
-                                         unsigned num_textures,
-                                         struct pipe_texture **);
+   void (*set_fragment_sampler_views)(struct pipe_context *,
+                                      unsigned num_views,
+                                      struct pipe_sampler_view **);
 
-   void (*set_vertex_sampler_textures)(struct pipe_context *,
-                                       unsigned num_textures,
-                                       struct pipe_texture **);
+   void (*set_vertex_sampler_views)(struct pipe_context *,
+                                    unsigned num_views,
+                                    struct pipe_sampler_view **);
 
    void (*set_vertex_buffers)( struct pipe_context *,
                                unsigned num_buffers,
@@ -303,6 +303,16 @@ struct pipe_context {
     */
    unsigned int (*is_buffer_referenced)(struct pipe_context *pipe,
 					struct pipe_buffer *buf);
+
+   /**
+    * Create a view on a texture to be used by a shader stage.
+    */
+   struct pipe_sampler_view * (*create_sampler_view)(struct pipe_context *ctx,
+                                                     struct pipe_texture *texture,
+                                                     const struct pipe_sampler_view *templat);
+
+   void (*sampler_view_destroy)(struct pipe_context *ctx,
+                                struct pipe_sampler_view *view);
 };
 
 
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 5cebd43ace2..73c70b2fe40 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -369,6 +369,17 @@ enum pipe_transfer_usage {
 
 
 /**
+ * Texture swizzles
+ */
+#define PIPE_SWIZZLE_RED   0
+#define PIPE_SWIZZLE_GREEN 1
+#define PIPE_SWIZZLE_BLUE  2
+#define PIPE_SWIZZLE_ALPHA 3
+#define PIPE_SWIZZLE_ZERO  4
+#define PIPE_SWIZZLE_ONE   5
+
+
+/**
  * Implementation capabilities/limits which are queried through
  * pipe_screen::get_param() and pipe_screen::get_paramf().
  */
diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 5ac5c878135..603848b11f4 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -310,6 +310,24 @@ struct pipe_surface
 
 
 /**
+ * A view into a texture that can be bound to a shader stage.
+ */
+struct pipe_sampler_view
+{
+   struct pipe_reference reference;
+   enum pipe_format format;      /**< typed PIPE_FORMAT_x */
+   struct pipe_texture *texture; /**< texture into which this is a view  */
+   struct pipe_context *context; /**< context this view belongs to */
+   unsigned first_level:8;       /**< first mipmap level */
+   unsigned num_levels:8;        /**< number of mipamp levels */
+   unsigned swizzle_r:3;         /**< PIPE_SWIZZLE_x for red component */
+   unsigned swizzle_g:3;         /**< PIPE_SWIZZLE_x for green component */
+   unsigned swizzle_b:3;         /**< PIPE_SWIZZLE_x for blue component */
+   unsigned swizzle_a:3;         /**< PIPE_SWIZZLE_x for alpha component */
+};
+
+
+/**
  * Transfer object.  For data transfer to/from a texture.
  */
 struct pipe_transfer