From 8e6ada7bc33e3cc4e1c17821ea171bf0815a505d Mon Sep 17 00:00:00 2001
From: Alam Arias <Alam.GBC@gmail.com>
Date: Tue, 1 Dec 2009 19:31:57 -0500
Subject: [PATCH] SDL GC hack

---
 configure.in                  |   17 ++
 include/SDL_config.h.in       |    1 +
 src/video/fbcon/SDL_fbgc.c    |  471 +++++++++++++++++++++++++++++++++++++++++
 src/video/fbcon/SDL_fbgc.h    |   35 +++
 src/video/fbcon/SDL_fbvideo.c |   10 +
 src/video/fbcon/SDL_fbvideo.h |   11 +
 6 files changed, 545 insertions(+), 0 deletions(-)
 create mode 100644 src/video/fbcon/SDL_fbgc.c
 create mode 100644 src/video/fbcon/SDL_fbgc.h

diff --git a/configure.in b/configure.in
index a7e9b18..a8961ba 100644
--- a/configure.in
+++ b/configure.in
@@ -1227,6 +1227,22 @@ AC_HELP_STRING([--enable-video-fbcon], [use framebuffer console video driver [[d
     fi
 }
 
+dnl See if we're running on Linux for the Nintendo GameCube/Wii
+dnl FIXME, perform a real test here...
+CheckGC()
+{
+    AC_ARG_ENABLE(video-gc,
+AC_HELP_STRING([--enable-video-gc], [enable GameCube video support in FB [[default=no]]]),
+                  , enable_video_gc=no)
+    if test x$enable_video = xyes -a x$enable_video_gc = xyes -a x$video_fbcon = xyes; then
+        video_gc=yes
+        AC_MSG_RESULT($video_gc)
+        if test x$video_gc = xyes; then
+            AC_DEFINE(SDL_VIDEO_DRIVER_GC)
+        fi
+    fi
+}
+
 dnl Find DirectFB
 CheckDirectFB()
 {
@@ -2322,6 +2338,7 @@ case "$host" in
         CheckX11
         CheckNANOX
         CheckFBCON
+        CheckGC
         CheckDirectFB
         CheckPS2GS
         CheckPS3
diff --git a/include/SDL_config.h.in b/include/SDL_config.h.in
index 58593ca..e523e9b 100644
--- a/include/SDL_config.h.in
+++ b/include/SDL_config.h.in
@@ -262,6 +262,7 @@
 #undef SDL_VIDEO_DRIVER_DUMMY
 #undef SDL_VIDEO_DRIVER_FBCON
 #undef SDL_VIDEO_DRIVER_GAPI
+#undef SDL_VIDEO_DRIVER_GC
 #undef SDL_VIDEO_DRIVER_GEM
 #undef SDL_VIDEO_DRIVER_GGI
 #undef SDL_VIDEO_DRIVER_IPOD
diff --git a/src/video/fbcon/SDL_fbgc.c b/src/video/fbcon/SDL_fbgc.c
new file mode 100644
index 0000000..b3b72bb
--- /dev/null
+++ b/src/video/fbcon/SDL_fbgc.c
@@ -0,0 +1,471 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#ifdef SDL_VIDEO_DRIVER_GC
+#include <errno.h>
+#include "SDL_video.h"
+#include "../SDL_blit.h"
+#include "SDL_fbgc.h"
+
+static Uint32 r_Yr[256];
+static Uint32 g_Yg_[256];
+static Uint32 b_Yb[256];
+static Uint32 r_Ur[256];
+static Uint32 g_Ug_[256];
+static Uint32 b_Ub[256];
+/* static Uint32 r_Vr[256]; // space and cache optimisation */
+#define r_Vr b_Ub
+static Uint32 g_Vg_[256];
+static Uint32 b_Vb[256];
+
+static Uint8 RGB16toY[1 << 16];
+static Uint8 RGB16toU[1 << 16];
+static Uint8 RGB16toV[1 << 16];
+
+#ifndef FBIOFLIPHACK
+#define FBIOFLIPHACK	0x4623 /* gc-linux */
+#endif
+
+#ifndef GC_BLACK
+#define GC_BLACK 0x00800080
+#endif
+
+#ifdef GC_DEBUG
+#  define GC_DPRINTF(fmt, args...) \
+	  fprintf(stderr,"DDD|%s: " fmt, __FUNCTION__ , ## args)
+#else
+#  define GC_DPRINTF(fmt, args...)
+#endif
+
+SDL_bool GC_Test(_THIS)
+{
+	int fliptest;
+	if (ioctl(console_fd, FBIOFLIPHACK, &fliptest))
+		return SDL_TRUE;
+	return SDL_FALSE;
+}
+
+SDL_bool GC_Available(void)
+{
+	if (access("/sys/bus/of_platform/drivers/gcn-vifb", 0) == 0)
+		return SDL_TRUE;
+
+	return SDL_FALSE;
+}
+
+/*
+ *
+ * Color space handling.
+ */
+
+#define RGB2YUV_SHIFT   16
+#define RGB2YUV_LUMA    16
+#define RGB2YUV_CHROMA 128
+
+#define Yr ((int)( 0.299*(1<<RGB2YUV_SHIFT)))
+#define Yg ((int)( 0.587*(1<<RGB2YUV_SHIFT)))
+#define Yb ((int)( 0.114*(1<<RGB2YUV_SHIFT)))
+
+#define Ur ((int)(-0.169*(1<<RGB2YUV_SHIFT)))
+#define Ug ((int)(-0.331*(1<<RGB2YUV_SHIFT)))
+#define Ub ((int)( 0.500*(1<<RGB2YUV_SHIFT)))
+
+#define Vr ((int)( 0.500*(1<<RGB2YUV_SHIFT)))	/* same as Ub */
+#define Vg ((int)(-0.419*(1<<RGB2YUV_SHIFT)))
+#define Vb ((int)(-0.081*(1<<RGB2YUV_SHIFT)))
+
+#define clamp(x, y, z) ((z < x) ? x : ((z > y) ? y : z))
+
+static void GC_InitRGB2YUVTables(void)
+{
+	unsigned int i;
+	unsigned int r, g, b;
+
+	for (i = 0; i < 256; i++) {
+		r_Yr[i] = Yr * i;
+		g_Yg_[i] = Yg * i + (RGB2YUV_LUMA << RGB2YUV_SHIFT);
+		b_Yb[i] = Yb * i;
+		r_Ur[i] = Ur * i;
+		g_Ug_[i] = Ug * i + (RGB2YUV_CHROMA << RGB2YUV_SHIFT);
+		b_Ub[i] = Ub * i;
+		r_Vr[i] = Vr * i;
+		g_Vg_[i] = Vg * i + (RGB2YUV_CHROMA << RGB2YUV_SHIFT);
+		b_Vb[i] = Vb * i;
+	}
+
+	for (i = 0; i < 1 << 16; i++) {
+		/* RGB565 */
+		r = ((i >> 8) & 0xf8);
+		g = ((i >> 3) & 0xfc);
+		b = ((i << 3) & 0xf8);
+		/* extend to 8bit */
+		r |= (r >> 5);
+		g |= (g >> 6);
+		b |= (b >> 5);
+
+		RGB16toY[i] =
+		    clamp(16, 235,
+			  (r_Yr[r] + g_Yg_[g] + b_Yb[b]) >> RGB2YUV_SHIFT);
+		RGB16toU[i] =
+		    clamp(16, 240,
+			  (r_Ur[r] + g_Ug_[g] + b_Ub[b]) >> RGB2YUV_SHIFT);
+		RGB16toV[i] =
+		    clamp(16, 240,
+			  (r_Vr[r] + g_Vg_[g] + b_Vb[b]) >> RGB2YUV_SHIFT);
+	}
+}
+
+static inline Uint32 rgbrgb16toyuy2(Uint16 rgb1, Uint16 rgb2)
+{
+	register int Y1, Cb, Y2, Cr;
+	Uint16 rgb;
+
+	/* fast path, thanks to bohdy */
+	if (!(rgb1 | rgb2)) {
+		return GC_BLACK;	/* black, black */
+	}
+
+	if (rgb1 == rgb2) {
+		/* fast path, thanks to isobel */
+		Y1 = Y2 = RGB16toY[rgb1];
+		Cb = RGB16toU[rgb1];
+		Cr = RGB16toV[rgb1];
+	} else {
+		Y1 = RGB16toY[rgb1];
+		Y2 = RGB16toY[rgb2];
+
+		/* RGB565 average */
+		rgb = ((rgb1 >> 1) & 0xFBEF) + ((rgb2 >> 1) & 0xFBEF) +
+		    ((rgb1 & rgb2) & 0x0821);
+
+		Cb = RGB16toU[rgb];
+		Cr = RGB16toV[rgb];
+	}
+
+	return (((char)Y1) << 24) | (((char)Cb) << 16) | (((char)Y2) << 8)
+	    | (((char)Cr) << 0);
+}
+
+/*
+ *
+ * Blitters.
+ */
+static void GC_UpdateRectRGB16(_THIS, SDL_Rect * rect, int pitch)
+{
+	int width, height, left, i, mod, mod32;
+	Uint8 *src, *dst;
+	Uint32 *src32, *dst32;
+	Uint16 *rgb;
+
+	/* XXX case width < 2 needs special treatment */
+
+	/* in pixel units */
+	left = rect->x & ~1;	/* 2 pixel align */
+	width = (rect->w + 1) & ~1;	/* 2 pixel align in excess */
+	height = rect->h;
+
+	/* in bytes, src and dest are 16bpp */
+	src = shadow_mem + (rect->y * pitch) + left * 2;
+	dst = flip_address[back_page] + page_offset +
+		 (rect->y * pitch) + left * 2;
+	mod = pitch - width * 2;
+
+	src32 = (Uint32 *) src;
+	dst32 = (Uint32 *) dst;
+	mod32 = mod / 4;
+
+	while (height--) {
+		i = width / 2;
+
+		while (i--) {
+			rgb = (Uint16 *) src32;
+			*dst32++ = rgbrgb16toyuy2(rgb[0], rgb[1]);
+			src32++;
+		}
+		src32 += mod32;
+		dst32 += mod32;
+	}
+}
+
+void GC_Init(_THIS, SDL_PixelFormat *vformat)
+{
+	GC_InitRGB2YUVTables();
+
+	/* 16 bits per pixel */
+	vformat->BitsPerPixel = 16;
+	vformat->BytesPerPixel = 2;
+	/* RGB565 */
+	vformat->Rmask = 0x0000f800;
+	vformat->Gmask = 0x000007e0;
+	vformat->Bmask = 0x0000001f;
+
+	shadow_fb = 1;
+}
+
+/*
+ *
+ * Video mode handling.
+ */
+
+/* only 640x480 16bpp is currently supported */
+const static SDL_Rect RECT_640x480 = { 0, 0, 640, 480 };
+const static SDL_Rect *vid_modes[] = {
+	&RECT_640x480,
+	NULL
+};
+
+static SDL_Rect **GC_ListModes(_THIS, SDL_PixelFormat * format, Uint32 flags)
+{
+	switch (format->BitsPerPixel) {
+	case 16:
+		return (SDL_Rect **) vid_modes;
+	default:
+		return NULL;
+	}
+}
+
+SDL_Surface *GC_SetVideoMode(_THIS, SDL_Surface * current,
+			     int width, int height, int bpp, Uint32 flags)
+{
+	struct fb_fix_screeninfo finfo;
+	struct fb_var_screeninfo vinfo;
+	int i;
+	Uint32 Rmask;
+	Uint32 Gmask;
+	Uint32 Bmask;
+	Uint32 *p, *q;
+	Uint32 yres;
+
+	GC_DPRINTF("Setting %dx%d %dbpp %smode\n", width, height, bpp,
+			(flags & SDL_DOUBLEBUF)?"(doublebuf) ":"");
+
+	/* Set the terminal into graphics mode */
+	if (FB_EnterGraphicsMode(this) < 0) {
+		return (NULL);
+	}
+
+	/* Restore the original palette */
+	//FB_RestorePalette(this);
+
+	/* Set the video mode and get the final screen format */
+	if (ioctl(console_fd, FBIOGET_VSCREENINFO, &vinfo) < 0) {
+		SDL_SetError("Couldn't get console screen info");
+		return (NULL);
+	}
+
+	yres = vinfo.yres;
+
+	/* hack to center 640x480 resolution on PAL cubes */
+	if (vinfo.xres == 640 && vinfo.yres == 576) {
+		page_offset = ((576 - 480) / 2) * 640 * ((bpp + 7) / 8);
+	} else {
+		page_offset = 0;
+	}
+
+	/* clear all video memory */
+	p = (Uint32 *)mapped_mem;
+	q = (Uint32 *)(mapped_mem + mapped_memlen);
+	while (p < q)
+		*p++ = GC_BLACK;
+
+	if ((vinfo.xres != width) || (vinfo.yres != height) ||
+	    (vinfo.bits_per_pixel != bpp)) {
+		vinfo.activate = FB_ACTIVATE_NOW;
+		vinfo.accel_flags = 0;
+		vinfo.bits_per_pixel = bpp;
+		vinfo.xres = width;
+		vinfo.xres_virtual = width;
+		/* do not modify yres*, we use a fake 640x480 mode in PAL */
+		//vinfo.yres = height;
+		//vinfo.yres_virtual = 2*height;
+		vinfo.xoffset = 0;
+		vinfo.yoffset = 0;
+		vinfo.red.length = vinfo.red.offset = 0;
+		vinfo.green.length = vinfo.green.offset = 0;
+		vinfo.blue.length = vinfo.blue.offset = 0;
+		vinfo.transp.length = vinfo.transp.offset = 0;
+
+		if (ioctl(console_fd, FBIOPUT_VSCREENINFO, &vinfo) < 0) {
+			SDL_SetError("Couldn't set console screen info");
+			return (NULL);
+		}
+	} else {
+		int maxheight;
+
+		/* Figure out how much video memory is available */
+		maxheight = 2*yres;
+		if (vinfo.yres_virtual > maxheight) {
+			vinfo.yres_virtual = maxheight;
+		}
+	}
+	cache_vinfo = vinfo;
+
+	Rmask = 0;
+	for (i = 0; i < vinfo.red.length; ++i) {
+		Rmask <<= 1;
+		Rmask |= (0x00000001 << vinfo.red.offset);
+	}
+	Gmask = 0;
+	for (i = 0; i < vinfo.green.length; ++i) {
+		Gmask <<= 1;
+		Gmask |= (0x00000001 << vinfo.green.offset);
+	}
+	Bmask = 0;
+	for (i = 0; i < vinfo.blue.length; ++i) {
+		Bmask <<= 1;
+		Bmask |= (0x00000001 << vinfo.blue.offset);
+	}
+	if (!SDL_ReallocFormat(current, bpp, Rmask, Gmask, Bmask, 0)) {
+		return (NULL);
+	}
+
+	/* Get the fixed information about the console hardware.
+	   This is necessary since finfo.line_length changes.
+	 */
+	if (ioctl(console_fd, FBIOGET_FSCREENINFO, &finfo) < 0) {
+		SDL_SetError("Couldn't get console hardware info");
+		return (NULL);
+	}
+
+	/* Save hardware palette, if needed */
+	//FB_SavePalette(this, &finfo, &vinfo);
+
+	/* Set up the new mode framebuffer */
+	current->flags = SDL_FULLSCREEN;
+	current->w = width;
+	current->h = height;
+	current->pitch = width * ((bpp + 7) / 8);
+	current->pixels = shadow_mem;
+
+	flip_address[0] = mapped_mem;
+	flip_address[1] = mapped_mem + current->pitch * yres;
+
+	back_page = 1;
+	if (flags & SDL_DOUBLEBUF) {
+		current->flags |= SDL_DOUBLEBUF;
+		flip_pending = 1;
+	} else {
+		flip_pending = 0;
+		/* make page 0 both the visible and back page */
+		back_page = ioctl(console_fd, FBIOFLIPHACK, &back_page);
+		if (back_page < 0)
+			back_page = 0;
+	}
+
+	/* Set the update rectangle function */
+	switch (bpp) {
+	case 16:
+		GC_DPRINTF("Using 16bpp blitter\n");
+		this->hidden->UpdateRect = GC_UpdateRectRGB16;
+		break;
+	default:
+		GC_DPRINTF("Using NO blitter\n");
+		this->hidden->UpdateRect = NULL;
+		break;
+	}
+
+	/* Handle OpenGL support */
+#ifdef HAVE_OPENGL
+	if (flags & SDL_OPENGL) {
+		if (GC_GL_CreateWindow(this, width, height) == 0) {
+			current->flags |= (SDL_OPENGL | SDL_FULLSCREEN);
+		} else {
+			current = NULL;
+		}
+	}
+#endif				/* HAVE_OPENGL */
+
+	/* We're done */
+	return (current);
+}
+
+static int GC_FlipHWSurface(_THIS, SDL_Surface * surface)
+{
+	if (flip_pending) {
+		/* SDL_UpdateRect was not called */
+		SDL_UpdateRect(this->screen, 0, 0, 0, 0);
+	}
+
+	/* flip video page as soon as possible */
+	ioctl(console_fd, FBIOFLIPHACK, NULL);
+	flip_pending = 1;
+
+	return (0);
+}
+
+static void GC_WaitForFlipCompletion(_THIS)
+{
+	int visible_page;
+	int result;
+
+	if (flip_pending) {
+		flip_pending = 0;
+		back_page ^= 1;
+		visible_page = back_page;
+		while (visible_page == back_page) {
+			/* wait until back_page is not visible */
+			result = ioctl(console_fd, FBIOFLIPHACK, &back_page);
+			if (result < 0) {
+				if ((errno == EINTR) || (errno == EAGAIN))
+					continue;
+				return; /* ioctl unsupported ... */
+			}
+			visible_page = result;
+		}
+		/*
+		 * At this point the back_page is not visible. We can safely
+		 * write to it without tearing.
+		 */
+	}
+}
+
+static void GC_UpdateRects(_THIS, int numrects, SDL_Rect * rects)
+{
+	SDL_Surface *screen;
+	int pitch;
+
+	/* external yuy2 fb is 16bpp */
+
+	screen = this->screen;
+	pitch = screen->pitch;	/* this is the pitch of the shadow buffer */
+
+	if (this->hidden->UpdateRect) {
+		GC_WaitForFlipCompletion(this);
+		while (numrects--) {
+			if (rects->w <= 0 || rects->h <= 0)
+				continue;
+			this->hidden->UpdateRect(this, rects, pitch);
+			rects++;
+		}
+	}
+}
+
+void GC_CreateDevice(SDL_VideoDevice *this)
+{
+	this->ListModes = GC_ListModes;
+	this->SetVideoMode = GC_SetVideoMode;
+	this->FlipHWSurface = GC_FlipHWSurface;
+	this->UpdateRects = GC_UpdateRects;
+}
+
+#endif
diff --git a/src/video/fbcon/SDL_fbgc.h b/src/video/fbcon/SDL_fbgc.h
new file mode 100644
index 0000000..534a73e
--- /dev/null
+++ b/src/video/fbcon/SDL_fbgc.h
@@ -0,0 +1,35 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+
+#ifdef SDL_VIDEO_DRIVER_GC
+/* Gamecube/Wii hardware setup for the SDL framebuffer console driver */
+
+#include "SDL_fbvideo.h"
+
+extern SDL_bool GC_Available(void);
+extern void GC_CreateDevice(SDL_VideoDevice *this);
+
+extern SDL_bool GC_Test(_THIS);
+extern void GC_Init(_THIS, SDL_PixelFormat *vformat);
+#endif
diff --git a/src/video/fbcon/SDL_fbvideo.c b/src/video/fbcon/SDL_fbvideo.c
index 81a89da..328790e 100644
--- a/src/video/fbcon/SDL_fbvideo.c
+++ b/src/video/fbcon/SDL_fbvideo.c
@@ -272,6 +272,11 @@ static SDL_VideoDevice *FB_CreateDevice(int devindex)
 
 	this->free = FB_DeleteDevice;
 
+#ifdef SDL_VIDEO_DRIVER_GC
+	if (GC_Available(this))
+		GC_CreateDevice(this);
+#endif
+
 	return this;
 }
 
@@ -784,6 +789,11 @@ static int FB_VideoInit(_THIS, SDL_PixelFormat *vformat)
 		}
 	}
 
+#ifdef SDL_VIDEO_DRIVER_GC
+	if (GC_Test(this))
+		GC_Init(this, vformat);
+#endif
+
 	if (shadow_fb) {
 		shadow_mem = (char *)SDL_malloc(mapped_memlen);
 		if (shadow_mem == NULL) {
diff --git a/src/video/fbcon/SDL_fbvideo.h b/src/video/fbcon/SDL_fbvideo.h
index 03b9e94..74d1460 100644
--- a/src/video/fbcon/SDL_fbvideo.h
+++ b/src/video/fbcon/SDL_fbvideo.h
@@ -106,6 +106,12 @@ struct SDL_PrivateVideoData {
 
 	void (*wait_vbl)(_THIS);
 	void (*wait_idle)(_THIS);
+#ifdef SDL_VIDEO_DRIVER_GC
+	void (*UpdateRect) (_THIS, SDL_Rect * rect, int pitch);
+	int back_page;
+	int page_offset;
+	int flip_pending;
+#endif
 };
 /* Old variable names */
 #define console_fd		(this->hidden->console_fd)
@@ -147,6 +153,11 @@ struct SDL_PrivateVideoData {
 #define screen_palette		(this->hidden->screen_palette)
 #define wait_vbl		(this->hidden->wait_vbl)
 #define wait_idle		(this->hidden->wait_idle)
+#ifdef SDL_VIDEO_DRIVER_GC
+#define back_page		(this->hidden->back_page)
+#define page_offset		(this->hidden->page_offset)
+#define flip_pending		(this->hidden->flip_pending)
+#endif
 
 /* Accelerator types that are supported by the driver, but are not
    necessarily in the kernel headers on the system we compile on.
-- 
1.6.5

