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-rw-r--r--include/GL/internal/dri_interface.h23
-rw-r--r--src/mesa/drivers/dri/common/dri_util.c11
-rw-r--r--src/mesa/drivers/dri/i915/intel_screen.c2
-rw-r--r--src/mesa/drivers/dri/radeon/radeon_screen.c4
4 files changed, 32 insertions, 8 deletions
diff --git a/include/GL/internal/dri_interface.h b/include/GL/internal/dri_interface.h
index 1efae11d62..e7fbf8e8b8 100644
--- a/include/GL/internal/dri_interface.h
+++ b/include/GL/internal/dri_interface.h
@@ -74,20 +74,38 @@ typedef struct __DRItexOffsetExtensionRec __DRItexOffsetExtension;
* structs and the loader can use the extensions it knows about by
* casting it to a more specific extension and optionally advertising
* the GLX extension. See below for examples.
+ *
+ * We never break API in for a DRI extension. If we need to change
+ * the way things work in a non-backwards compatible manner, we
+ * introduce a new extension. During a transition period, we can
+ * leave both the old and the new extension in the driver, which
+ * allows us to move to the new interface without having to update the
+ * loader(s) in lock step.
+ *
+ * However, we can add entry points to an extension over time as long
+ * as we don't break the old ones. As we add entry points to an
+ * extension, we increase the version number. The corresponding
+ * #define can be used to guard code that accesses the new entry
+ * points at compile time and the version field in the extension
+ * struct can be used at run-time to determine how to use the
+ * extension.
*/
struct __DRIextensionRec {
const char *name;
+ int version;
};
/**
* Used by drivers to indicate support for setting the read drawable.
*/
#define __DRI_READ_DRAWABLE "DRI_ReadDrawable"
+#define __DRI_READ_DRAWABLE_VERSION 1
/**
* Used by drivers that implement the GLX_MESA_copy_sub_buffer extension.
*/
#define __DRI_COPY_SUB_BUFFER "DRI_CopySubBuffer"
+#define __DRI_COPY_SUB_BUFFER_VERSION 1
struct __DRIcopySubBufferExtensionRec {
__DRIextension base;
void (*copySubBuffer)(__DRIdrawable *drawable, int x, int y, int w, int h);
@@ -98,6 +116,7 @@ struct __DRIcopySubBufferExtensionRec {
* GLX_MESA_swap_control extension.
*/
#define __DRI_SWAP_CONTROL "DRI_SwapControl"
+#define __DRI_SWAP_CONTROL_VERSION 1
struct __DRIswapControlExtensionRec {
__DRIextension base;
void (*setSwapInterval)(__DRIdrawable *drawable, unsigned int inteval);
@@ -108,6 +127,7 @@ struct __DRIswapControlExtensionRec {
* Used by drivers that implement the GLX_MESA_allocate_memory.
*/
#define __DRI_ALLOCATE "DRI_Allocate"
+#define __DRI_ALLOCATE_VERSION 1
struct __DRIallocateExtensionRec {
__DRIextension base;
@@ -124,6 +144,7 @@ struct __DRIallocateExtensionRec {
* Used by drivers that implement the GLX_MESA_swap_frame_usage extension.
*/
#define __DRI_FRAME_TRACKING "DRI_FrameTracking"
+#define __DRI_FRAME_TRACKING_VERSION 1
struct __DRIframeTrackingExtensionRec {
__DRIextension base;
@@ -149,6 +170,7 @@ struct __DRIframeTrackingExtensionRec {
* Used by drivers that implement the GLX_SGI_video_sync extension.
*/
#define __DRI_MEDIA_STREAM_COUNTER "DRI_MediaStreamCounter"
+#define __DRI_MEDIA_STREAM_COUNTER_VERSION 1
struct __DRImediaStreamCounterExtensionRec {
__DRIextension base;
@@ -171,6 +193,7 @@ struct __DRImediaStreamCounterExtensionRec {
#define __DRI_TEX_OFFSET "DRI_TexOffset"
+#define __DRI_TEX_OFFSET_VERSION 1
struct __DRItexOffsetExtensionRec {
__DRIextension base;
diff --git a/src/mesa/drivers/dri/common/dri_util.c b/src/mesa/drivers/dri/common/dri_util.c
index 2209321978..d59ea0ddad 100644
--- a/src/mesa/drivers/dri/common/dri_util.c
+++ b/src/mesa/drivers/dri/common/dri_util.c
@@ -51,7 +51,7 @@ static const int empty_attribute_list[1] = { None };
* supports setting a read drawable.
*/
const __DRIextension driReadDrawableExtension = {
- __DRI_READ_DRAWABLE
+ __DRI_READ_DRAWABLE, __DRI_READ_DRAWABLE_VERSION
};
/**
@@ -393,7 +393,7 @@ static int driWaitForMSC(__DRIdrawable *drawable, int64_t target_msc,
}
const __DRImediaStreamCounterExtension driMediaStreamCounterExtension = {
- { __DRI_MEDIA_STREAM_COUNTER },
+ { __DRI_MEDIA_STREAM_COUNTER, __DRI_MEDIA_STREAM_COUNTER_VERSION },
driGetMSC,
driWaitForMSC,
};
@@ -406,7 +406,8 @@ static void driCopySubBuffer(__DRIdrawable *drawable,
}
const __DRIcopySubBufferExtension driCopySubBufferExtension = {
- { __DRI_COPY_SUB_BUFFER }, driCopySubBuffer
+ { __DRI_COPY_SUB_BUFFER, __DRI_COPY_SUB_BUFFER_VERSION },
+ driCopySubBuffer
};
static void driSetSwapInterval(__DRIdrawable *drawable, unsigned int interval)
@@ -424,7 +425,7 @@ static unsigned int driGetSwapInterval(__DRIdrawable *drawable)
}
const __DRIswapControlExtension driSwapControlExtension = {
- { __DRI_SWAP_CONTROL },
+ { __DRI_SWAP_CONTROL, __DRI_SWAP_CONTROL_VERSION },
driSetSwapInterval,
driGetSwapInterval
};
@@ -819,7 +820,7 @@ driQueryFrameTracking(__DRIdrawable *drawable,
}
const __DRIframeTrackingExtension driFrameTrackingExtension = {
- { __DRI_FRAME_TRACKING },
+ { __DRI_FRAME_TRACKING, __DRI_FRAME_TRACKING_VERSION },
driFrameTracking,
driQueryFrameTracking
};
diff --git a/src/mesa/drivers/dri/i915/intel_screen.c b/src/mesa/drivers/dri/i915/intel_screen.c
index 191d26e84b..b5eab5ba00 100644
--- a/src/mesa/drivers/dri/i915/intel_screen.c
+++ b/src/mesa/drivers/dri/i915/intel_screen.c
@@ -420,7 +420,7 @@ intelUpdateScreenFromSAREA(intelScreenPrivate * intelScreen,
}
static const __DRIallocateExtension intelAllocateExtension = {
- { __DRI_ALLOCATE },
+ { __DRI_ALLOCATE, __DRI_ALLOCATE_VERSION },
intelAllocateMemoryMESA,
intelFreeMemoryMESA,
intelGetMemoryOffsetMESA
diff --git a/src/mesa/drivers/dri/radeon/radeon_screen.c b/src/mesa/drivers/dri/radeon/radeon_screen.c
index 84c6885d50..10d3c2b27c 100644
--- a/src/mesa/drivers/dri/radeon/radeon_screen.c
+++ b/src/mesa/drivers/dri/radeon/radeon_screen.c
@@ -334,7 +334,7 @@ radeonFillInModes( unsigned pixel_bits, unsigned depth_bits,
#if RADEON_COMMON && defined(RADEON_COMMON_FOR_R200)
static const __DRIallocateExtension r200AllocateExtension = {
- { __DRI_ALLOCATE },
+ { __DRI_ALLOCATE, __DRI_ALLOCATE_VERSION },
r200AllocateMemoryMESA,
r200FreeMemoryMESA,
r200GetMemoryOffsetMESA
@@ -343,7 +343,7 @@ static const __DRIallocateExtension r200AllocateExtension = {
#if RADEON_COMMON && defined(RADEON_COMMON_FOR_R300)
static const __DRItexOffsetExtension r300texOffsetExtension = {
- { __DRI_TEX_OFFSET },
+ { __DRI_TEX_OFFSET, __DRI_TEX_OFFSET_VERSION },
r300SetTexOffset,
};
#endif