From b58c5ad7b0a2c3ed3ecf189f284e23118091fa68 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Mon, 10 Jun 2002 15:16:44 +0000
Subject: GGI driver updates (Filip Spacek)

---
 src/mesa/drivers/ggi/include/ggi/mesa/ggimesa.h    | 58 +++++++++-------------
 .../drivers/ggi/include/ggi/mesa/ggimesa_int.h     | 31 ++++++++++--
 2 files changed, 50 insertions(+), 39 deletions(-)

(limited to 'src/mesa/drivers/ggi/include')

diff --git a/src/mesa/drivers/ggi/include/ggi/mesa/ggimesa.h b/src/mesa/drivers/ggi/include/ggi/mesa/ggimesa.h
index a1e67fcbbf..5596e765d4 100644
--- a/src/mesa/drivers/ggi/include/ggi/mesa/ggimesa.h
+++ b/src/mesa/drivers/ggi/include/ggi/mesa/ggimesa.h
@@ -45,50 +45,40 @@
 #include <ggi/ggi.h>
 #include "GL/ggimesa.h"
 
-struct ggi_mesa_info;
+/*
+ * GGIMesa visual configuration.
+ * 
+ * This structure "derives" from Mesa's GLvisual and extends it by
+ * GGI's visual. Combination of these two structures is enough to fully
+ * describe the mode the application is currently running in.  GGI
+ * visual provides information about color configuration and buffering
+ * method, GLvisual fills the rest.
+ */
+struct ggi_mesa_visual {
+	GLvisual gl_visual;
+	ggi_visual_t ggi_visual;
+};
 
+/*
+ * GGIMesa context.
+ *
+ * GGIMesa context expands the Mesa's context (it doesn't actualy derive
+ * from it, but this ability isn't needed, and it is best if GL context
+ * creation is left up to Mesa). It also contains a reference to the GGI
+ * visual it is attached to, which is very useful for all Mesa callbacks.
+ */
 struct ggi_mesa_context
 {
 	GLcontext *gl_ctx;
-	GLvisual *gl_vis;
-	GLframebuffer *gl_buffer;
+	ggi_visual_t ggi_visual;
 	
-	ggi_visual_t ggi_vis;
-	ggi_coord origin;
-	int flip_y;
-	int width, height, stride;	/* Stride is in pixels */
 	ggi_pixel color;		/* Current color or index*/
 	ggi_pixel clearcolor;
-	void *lfb[2];			/* Linear frame buffers	*/
-	int active_buffer;
-	int bufsize;
-	int viewport_init;
-};
-
-struct ggi_mesa_info
-{
-	GLboolean rgb_flag;
-	GLboolean db_flag;
-	GLboolean alpha_flag;
-	GLint index_bits;
-	GLint red_bits, green_bits, blue_bits, alpha_bits;
-	GLint depth_bits, stencil_bits, accum_bits;
+	
+	void *private;
 };
 
-extern GGIMesaContext GGIMesa;	/* The current context */
-
 #define SHIFT (GGI_COLOR_PRECISION - 8)
 
-#define GGICTX ((GGIMesaContext)ctx->DriverCtx)
-#define VIS (GGICTX->ggi_vis)
-#define FLIP(y) (GGICTX->flip_y-(y))
-
-#define LFB(type,x,y) ((type *)GGICTX->lfb[0] + (x) + (y) * GGICTX->stride)
-
-#define CTX_OPMESA(ctx) \
-((struct mesa_ext *)LIBGGI_EXT(((GGIMesaContext)ctx->DriverCtx)->ggi_vis, \
-	ggiMesaID))
-
-	
 #endif
 
diff --git a/src/mesa/drivers/ggi/include/ggi/mesa/ggimesa_int.h b/src/mesa/drivers/ggi/include/ggi/mesa/ggimesa_int.h
index ae4a3c5825..da8b10f2ff 100644
--- a/src/mesa/drivers/ggi/include/ggi/mesa/ggimesa_int.h
+++ b/src/mesa/drivers/ggi/include/ggi/mesa/ggimesa_int.h
@@ -11,14 +11,35 @@ extern ggi_extid ggiMesaID;
 ggifunc_setmode GGIMesa_setmode;
 ggifunc_getapi GGIMesa_getapi;
 
-typedef struct mesa_ext
+typedef struct ggi_mesa_ext
 {
-	void (*update_state)(GLcontext *ctx);
-	int (*setup_driver)(GGIMesaContext ctx, struct ggi_mesa_info *info);
+	/*
+	 * How mesa extends this visual; i.e., size of the depth buffer etc.
+	 *
+	 * By default (upon attaching) this structure is initialized to what
+	 * libggi is guaranteed to handle without any help: single buffered
+	 * visual without any ancilary buffers.
+	 */
+	struct ggi_mesa_visual mesa_visual;
+
+	/*
+	 * Mesa framebuffer is a collection of all ancilary buffers required.
+	 *
+	 * This structure contains the ancilary buffers provided in in
+	 * software. On each mode change it is loaded with the list of
+	 * required buffers and the target is expected to clear the ones
+	 * it can provide in hw. The remaining ones are then provided in sw.
+	 *
+	 */
+	GLframebuffer mesa_buffer;
+
+	void (*update_state)(ggi_mesa_context_t ctx);
+	int (*setup_driver)(ggi_mesa_context_t ctx);
+	
 	void *private;
-} mesaext;
+} ggi_mesa_ext_t;
 
-#define LIBGGI_MESAEXT(vis) ((mesaext *)LIBGGI_EXT(vis,ggiMesaID))
+#define LIBGGI_MESAEXT(vis) ((ggi_mesa_ext_t *)LIBGGI_EXT(vis,ggiMesaID))
 #define GGIMESA_PRIVATE(vis) ((LIBGGI_MESAEXT(vis)->private))
 
 #endif /* _GGI_MISC_INT_H */
-- 
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