st/dri: cleanup dri extension handling

Explicitly set the version that is implemented, as that may differ
from the one defined in dri_interface.h. Use designated initialisers
and constify whereever possible.

Note: __DRIimageExtension should not be made const as it's modified
at runtime. This patch should have no side effects on compilers that
do not support designated initialisers, as the existing code in
dri/common already uses them.

Signed-off-by: Emil Velikov <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>
Reviewed-by: Kristian Høgsberg <[email protected]>

2 files changed, 30 insertions, 25 deletions

diff --git a/src/gallium/state_trackers/dri/common/dri_drawable.c b/src/gallium/state_trackers/dri/common/dri_drawable.c
index a399938c879..b7df053594c 100644
--- a/src/gallium/state_trackers/dri/common/dri_drawable.c
+++ b/src/gallium/state_trackers/dri/common/dri_drawable.c
@@ -258,10 +258,11 @@ dri_set_tex_buffer(__DRIcontext *pDRICtx, GLint target,
 }
 
 const __DRItexBufferExtension driTexBufferExtension = {
-    { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
-   dri_set_tex_buffer,
-   dri_set_tex_buffer2,
-   NULL,
+   .base = { __DRI_TEX_BUFFER, 2 },
+
+   .setTexBuffer       = dri_set_tex_buffer,
+   .setTexBuffer2      = dri_set_tex_buffer2,
+   .releaseTexBuffer   = NULL,
 };
 
 /**
@@ -561,8 +562,9 @@ dri_throttle(__DRIcontext *cPriv, __DRIdrawable *dPriv,
 
 
 const __DRI2throttleExtension dri2ThrottleExtension = {
-    .base = { __DRI2_THROTTLE, __DRI2_THROTTLE_VERSION },
-    .throttle = dri_throttle,
+    .base = { __DRI2_THROTTLE, 1 },
+
+    .throttle          = dri_throttle,
 };
 
 
diff --git a/src/gallium/state_trackers/dri/drm/dri2.c b/src/gallium/state_trackers/dri/drm/dri2.c
index 4f2a87e86ce..7dccc5e0ef3 100644
--- a/src/gallium/state_trackers/dri/drm/dri2.c
+++ b/src/gallium/state_trackers/dri/drm/dri2.c
@@ -95,10 +95,11 @@ dri2_invalidate_drawable(__DRIdrawable *dPriv)
 }
 
 static const __DRI2flushExtension dri2FlushExtension = {
-    { __DRI2_FLUSH, __DRI2_FLUSH_VERSION },
-    dri2_flush_drawable,
-    dri2_invalidate_drawable,
-    dri_flush,
+    .base = { __DRI2_FLUSH, 4 },
+
+    .flush                = dri2_flush_drawable,
+    .invalidate           = dri2_invalidate_drawable,
+    .flush_with_flags     = dri_flush,
 };
 
 /**
@@ -110,7 +111,7 @@ dri2_drawable_get_buffers(struct dri_drawable *drawable,
                           unsigned *count)
 {
    __DRIdrawable *dri_drawable = drawable->dPriv;
-   struct __DRIdri2LoaderExtensionRec *loader = drawable->sPriv->dri2.loader;
+   const __DRIdri2LoaderExtension *loader = drawable->sPriv->dri2.loader;
    boolean with_format;
    __DRIbuffer *buffers;
    int num_buffers;
@@ -522,7 +523,7 @@ dri2_flush_frontbuffer(struct dri_context *ctx,
                        enum st_attachment_type statt)
 {
    __DRIdrawable *dri_drawable = drawable->dPriv;
-   struct __DRIdri2LoaderExtensionRec *loader = drawable->sPriv->dri2.loader;
+   const __DRIdri2LoaderExtension *loader = drawable->sPriv->dri2.loader;
    struct pipe_context *pipe = ctx->st->pipe;
 
    if (statt != ST_ATTACHMENT_FRONT_LEFT)
@@ -557,7 +558,7 @@ dri2_update_tex_buffer(struct dri_drawable *drawable,
 static __DRIimage *
 dri2_lookup_egl_image(struct dri_screen *screen, void *handle)
 {
-   __DRIimageLookupExtension *loader = screen->sPriv->dri2.image;
+   const __DRIimageLookupExtension *loader = screen->sPriv->dri2.image;
    __DRIimage *img;
 
    if (!loader->lookupEGLImage)
@@ -1035,18 +1036,20 @@ dri2_destroy_image(__DRIimage *img)
    FREE(img);
 }
 
-static struct __DRIimageExtensionRec dri2ImageExtension = {
-    { __DRI_IMAGE, 6 },
-    dri2_create_image_from_name,
-    dri2_create_image_from_renderbuffer,
-    dri2_destroy_image,
-    dri2_create_image,
-    dri2_query_image,
-    dri2_dup_image,
-    dri2_validate_usage,
-    dri2_from_names,
-    dri2_from_planar,
-    dri2_create_from_texture,
+/* The extension is modified during runtime if DRI_PRIME is detected */
+static __DRIimageExtension dri2ImageExtension = {
+    .base = { __DRI_IMAGE, 6 },
+
+    .createImageFromName          = dri2_create_image_from_name,
+    .createImageFromRenderbuffer  = dri2_create_image_from_renderbuffer,
+    .destroyImage                 = dri2_destroy_image,
+    .createImage                  = dri2_create_image,
+    .queryImage                   = dri2_query_image,
+    .dupImage                     = dri2_dup_image,
+    .validateUsage                = dri2_validate_usage,
+    .createImageFromNames         = dri2_from_names,
+    .fromPlanar                   = dri2_from_planar,
+    .createImageFromTexture       = dri2_create_from_texture,
 };
 
 /*