targets/dri: Add __driDriverGetExtensions_(r300|r600|radeonsi) symbols

The symbol is introduced by the mesa megadrivers, and
adding gallium support for it will allow us to merge
st/dri/drm and st/dri/sw. Resulting in a single dri library
across all of gallium.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Tested-by: Rob Clark <robclark@freedesktop.org>
Tested-by: Thomas Helland <thomashelland90 at gmail.com>
Acked-by: Tom Stellard <thomas.stellard@amd.com>

src/gallium/auxiliary/target-helpers/inline_drm_helper.h

@@ -106,6 +106,18 @@ pipe_nouveau_create_screen(int fd)
 #endif
 
 #if defined(GALLIUM_R300)
+#if defined(DRI_TARGET)
+#include "dri_screen.h"
+
+const __DRIextension **__driDriverGetExtensions_r300(void);
+
+PUBLIC const __DRIextension **__driDriverGetExtensions_r300(void)
+{
+   globalDriverAPI = &galliumdrm_driver_api;
+   return galliumdrm_driver_extensions;
+}
+#endif
+
 static struct pipe_screen *
 pipe_r300_create_screen(int fd)
 {
@@ -117,6 +129,18 @@ pipe_r300_create_screen(int fd)
 #endif
 
 #if defined(GALLIUM_R600)
+#if defined(DRI_TARGET)
+#include "dri_screen.h"
+
+const __DRIextension **__driDriverGetExtensions_r600(void);
+
+PUBLIC const __DRIextension **__driDriverGetExtensions_r600(void)
+{
+   globalDriverAPI = &galliumdrm_driver_api;
+   return galliumdrm_driver_extensions;
+}
+#endif
+
 static struct pipe_screen *
 pipe_r600_create_screen(int fd)
 {
@@ -128,6 +152,18 @@ pipe_r600_create_screen(int fd)
 #endif
 
 #if defined(GALLIUM_RADEONSI)
+#if defined(DRI_TARGET)
+#include "dri_screen.h"
+
+const __DRIextension **__driDriverGetExtensions_radeonsi(void);
+
+PUBLIC const __DRIextension **__driDriverGetExtensions_radeonsi(void)
+{
+   globalDriverAPI = &galliumdrm_driver_api;
+   return galliumdrm_driver_extensions;
+}
+#endif
+
 static struct pipe_screen *
 pipe_radeonsi_create_screen(int fd)
 {

src/gallium/targets/dri/Makefile.am

@@ -18,6 +18,11 @@ AM_CPPFLAGS += \
 	-DDRI_TARGET
 endif
 
+if NEED_RADEON_DRM_WINSYS
+AM_CPPFLAGS += \
+	-DDRI_TARGET
+endif
+
 dridir = $(DRI_DRIVER_INSTALL_DIR)
 dri_LTLIBRARIES = gallium_dri.la