gallium/st: add pipe_context::generate_mipmap()

This patch adds a new interface to support hardware mipmap generation.
PIPE_CAP_GENERATE_MIPMAP is added to allow a driver to specify
if this new interface is supported; if not supported, the state tracker will
fallback to mipmap generation by rendering/texturing.

v2: add PIPE_CAP_GENERATE_MIPMAP to the disabled section for all drivers
v3: add format to the generate_mipmap interface to allow mipmap generation
    using a format other than the resource format
v4: fix return type of trace_context_generate_mipmap()

Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>
Reviewed-by: Jose Fonseca <[email protected]>

2 files changed, 13 insertions, 0 deletions

diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index 78155c05348..4b551ed0b41 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -677,6 +677,18 @@ struct pipe_context {
     */
    void (*dump_debug_state)(struct pipe_context *ctx, FILE *stream,
                             unsigned flags);
+
+   /**
+    * Generate mipmap.
+    * \return TRUE if mipmap generation succeeds, FALSE otherwise
+    */
+   boolean (*generate_mipmap)(struct pipe_context *ctx,
+                              struct pipe_resource *resource,
+                              enum pipe_format format,
+                              unsigned base_level,
+                              unsigned last_level,
+                              unsigned first_layer,
+                              unsigned last_layer);
 };
 
 
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 0655f080e42..cb837cd2597 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -643,6 +643,7 @@ enum pipe_cap
    PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL,
    PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT,
    PIPE_CAP_INVALIDATE_BUFFER,
+   PIPE_CAP_GENERATE_MIPMAP,
 };
 
 #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)