graw: Dynamically load graw libraries.

This allows to build multiple graws libs simultaneously and avoid
unnecessary rebuilds of the tests.

Also remove graw_util.c from inside the graw implementation -- it was
only being provided by one implementation, and graw tests were linking
against gallium anyway.

1 files changed, 152 insertions, 0 deletions

diff --git a/src/gallium/include/state_tracker/graw_dl.h b/src/gallium/include/state_tracker/graw_dl.h
new file mode 100644
index 0000000000..0b326ca9f1
--- /dev/null
+++ b/src/gallium/include/state_tracker/graw_dl.h
@@ -0,0 +1,152 @@
+#ifndef GALLIUM_RAW_DL_H
+#define GALLIUM_RAW_DL_H
+
+/* This is an API for exercising gallium functionality in a
+ * platform-neutral fashion.  Whatever platform integration is
+ * necessary to implement this interface is orchestrated by the
+ * individual target building this entity.
+ *
+ * For instance, the graw-xlib target includes code to implent these
+ * interfaces on top of the X window system.
+ *
+ * Programs using this interface may additionally benefit from some of
+ * the utilities currently in the libgallium.a library, especially
+ * those for parsing text representations of TGSI shaders.
+ */
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_format.h"
+#include "pipe/p_context.h"
+#include "util/u_dl.h"
+#include "tgsi/tgsi_text.h"
+#include  <stdio.h>
+
+
+struct pipe_screen;
+struct pipe_context;
+
+
+typedef void *
+(*pfn_graw_create_window_and_screen_t)( int x,
+                                        int y,
+                                        unsigned width,
+                                        unsigned height,
+                                        enum pipe_format format,
+			                void **handle );
+
+typedef void
+(*pfn_graw_set_display_func_t)( void (*func)( void ) );
+
+typedef void
+(*pfn_graw_main_loop_t)( void );
+
+
+static pfn_graw_create_window_and_screen_t
+pfn_graw_create_window_and_screen = NULL;
+
+static pfn_graw_set_display_func_t
+pfn_graw_set_display_func = NULL;
+
+static pfn_graw_main_loop_t
+pfn_graw_main_loop = NULL;
+
+
+static INLINE void *
+graw_create_window_and_screen( int x,
+                               int y,
+                               unsigned width,
+                               unsigned height,
+                               enum pipe_format format,
+                               void **handle )
+{
+   static struct util_dl_library *lib;
+   lib = util_dl_open(UTIL_DL_PREFIX "graw" UTIL_DL_EXT);
+   if (!lib)
+      goto error;
+   pfn_graw_create_window_and_screen = (pfn_graw_create_window_and_screen_t)
+      util_dl_get_proc_address(lib, "graw_create_window_and_screen");
+   if (!pfn_graw_create_window_and_screen)
+      goto error;
+   pfn_graw_set_display_func = (pfn_graw_set_display_func_t)
+      util_dl_get_proc_address(lib, "graw_set_display_func");
+   if (!pfn_graw_set_display_func)
+      goto error;
+   pfn_graw_main_loop = (pfn_graw_main_loop_t)
+      util_dl_get_proc_address(lib, "graw_main_loop");
+   if (!pfn_graw_main_loop)
+      goto error;
+   return pfn_graw_create_window_and_screen(x, y, width, height, format, handle );
+error:
+   fprintf(stderr, "failed to open " UTIL_DL_PREFIX "graw" UTIL_DL_EXT "\n");
+   return NULL;
+}
+
+static INLINE void 
+graw_set_display_func( void (*func)( void ) )
+{
+   if (!pfn_graw_set_display_func)
+      return;
+   pfn_graw_set_display_func(func);
+}
+
+static INLINE void 
+graw_main_loop( void )
+{
+   if (!pfn_graw_main_loop)
+      return;
+   pfn_graw_main_loop();
+}
+
+
+/* 
+ * Helper functions.  These are the same for all graw implementations.
+ *
+ * XXX: These aren't graw related. If they are useful then should go somwhere
+ * inside auxiliary/util.
+ */
+
+#define GRAW_MAX_NUM_TOKENS 1024
+
+static INLINE void *
+graw_parse_geometry_shader(struct pipe_context *pipe,
+                           const char *text)
+{
+   struct tgsi_token tokens[GRAW_MAX_NUM_TOKENS];
+   struct pipe_shader_state state;
+
+   if (!tgsi_text_translate(text, tokens, GRAW_MAX_NUM_TOKENS))
+      return NULL;
+
+   state.tokens = tokens;
+   return pipe->create_gs_state(pipe, &state);
+}
+
+static INLINE void *
+graw_parse_vertex_shader(struct pipe_context *pipe,
+                         const char *text)
+{
+   struct tgsi_token tokens[GRAW_MAX_NUM_TOKENS];
+   struct pipe_shader_state state;
+
+   if (!tgsi_text_translate(text, tokens, GRAW_MAX_NUM_TOKENS))
+      return NULL;
+
+   state.tokens = tokens;
+   return pipe->create_vs_state(pipe, &state);
+}
+
+static INLINE void *
+graw_parse_fragment_shader(struct pipe_context *pipe,
+                           const char *text)
+{
+   struct tgsi_token tokens[GRAW_MAX_NUM_TOKENS];
+   struct pipe_shader_state state;
+
+   if (!tgsi_text_translate(text, tokens, GRAW_MAX_NUM_TOKENS))
+      return NULL;
+
+   state.tokens = tokens;
+   return pipe->create_fs_state(pipe, &state);
+}
+
+#endif