dri: add __DRIimageLoaderExtension and __DRIimageDriverExtension

These provide an interface between the driver and the loader to allocate
color buffers through the DRIimage extension interface rather than through a
loader-specific extension (as is used by DRI2, for instance).

The driver uses the loader 'getBuffers' interface to allocate color buffers.

The loader uses the createNewScreen2, createNewDrawable, createNewContext,
getAPIMask and createContextAttribs APIS (mostly shared with DRI2).

This interface will work with the DRI3 loader, and should also work with GBM
and other loaders so that drivers need not be customized for each new loader
interface, as long as they provide this image interface.

v2: Fix build of i915 and i965 together (by anholt)

Signed-off-by: Keith Packard <[email protected]>
Reviewed-by: Kristian Høgsberg <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>

2 files changed, 19 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/common/dri_util.c b/src/mesa/drivers/dri/common/dri_util.c
index 46a2da4cb59..86cf24cb881 100644
--- a/src/mesa/drivers/dri/common/dri_util.c
+++ b/src/mesa/drivers/dri/common/dri_util.c
@@ -78,6 +78,8 @@ setupLoaderExtensions(__DRIscreen *psp,
 	    psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
 	if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
 	    psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
+        if (strcmp(extensions[i]->name, __DRI_IMAGE_LOADER) == 0)
+           psp->image.loader = (__DRIimageLoaderExtension *) extensions[i];
     }
 }
 
@@ -859,3 +861,14 @@ driImageFormatToGLFormat(uint32_t image_format)
       return MESA_FORMAT_NONE;
    }
 }
+
+/** Image driver interface */
+const __DRIimageDriverExtension driImageDriverExtension = {
+    .base = { __DRI_IMAGE_DRIVER, __DRI_IMAGE_DRIVER_VERSION },
+
+    .createNewScreen2           = driCreateNewScreen2,
+    .createNewDrawable          = driCreateNewDrawable,
+    .createNewContext           = driCreateNewContext,
+    .getAPIMask                 = driGetAPIMask,
+    .createContextAttribs       = driCreateContextAttribs,
+};
diff --git a/src/mesa/drivers/dri/common/dri_util.h b/src/mesa/drivers/dri/common/dri_util.h
index 7fab3e5f720..79a8564ad51 100644
--- a/src/mesa/drivers/dri/common/dri_util.h
+++ b/src/mesa/drivers/dri/common/dri_util.h
@@ -176,6 +176,10 @@ struct __DRIscreenRec {
 	__DRIuseInvalidateExtension *useInvalidate;
     } dri2;
 
+    struct {
+        __DRIimageLoaderExtension *loader;
+    } image;
+
     driOptionCache optionInfo;
     driOptionCache optionCache;
 
@@ -285,4 +289,6 @@ dri2InvalidateDrawable(__DRIdrawable *drawable);
 extern void
 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv);
 
+extern const __DRIimageDriverExtension driImageDriverExtension;
+
 #endif /* _DRI_UTIL_H_ */