Revert "xmesa: drop glide (FX) backend."

This reverts commit 2a2f8d806f74619f0a7cf97fdc7f7b3ad1cad81b.

3 files changed, 284 insertions, 6 deletions

diff --git a/src/mesa/drivers/x11/fakeglx.c b/src/mesa/drivers/x11/fakeglx.c
index b6569b1938..eecd52aa32 100644
--- a/src/mesa/drivers/x11/fakeglx.c
+++ b/src/mesa/drivers/x11/fakeglx.c
@@ -1440,7 +1440,7 @@ Fake_glXMakeContextCurrent( Display *dpy, GLXDrawable draw,
       }
       if (!drawBuffer) {
          /* drawable must be a new window! */
-         drawBuffer = XMesaCreateWindowBuffer( xmctx->xm_visual, draw );
+         drawBuffer = XMesaCreateWindowBuffer2( xmctx->xm_visual, draw, xmctx);
          if (!drawBuffer) {
             /* Out of memory, or context/drawable depth mismatch */
             return False;
@@ -1457,7 +1457,8 @@ Fake_glXMakeContextCurrent( Display *dpy, GLXDrawable draw,
       }
       if (!readBuffer) {
          /* drawable must be a new window! */
-         readBuffer = XMesaCreateWindowBuffer( xmctx->xm_visual, read );
+         readBuffer = XMesaCreateWindowBuffer2(glxCtx->xmesaContext->xm_visual,
+                                               read, xmctx);
          if (!readBuffer) {
             /* Out of memory, or context/drawable depth mismatch */
             return False;
@@ -1929,6 +1930,12 @@ Fake_glXWaitX( void )
 static const char *
 get_extensions( void )
 {
+#ifdef FX
+   const char *fx = _mesa_getenv("MESA_GLX_FX");
+   if (fx && fx[0] != 'd') {
+      return EXTENSIONS;
+   }
+#endif
    return EXTENSIONS + 23; /* skip "GLX_MESA_set_3dfx_mode" */
 }
 
@@ -2100,7 +2107,7 @@ Fake_glXCreateWindow( Display *dpy, GLXFBConfig config, Window win,
    if (!xmvis)
       return 0;
 
-   xmbuf = XMesaCreateWindowBuffer(xmvis, win);
+   xmbuf = XMesaCreateWindowBuffer2(xmvis, win, NULL);
    if (!xmbuf)
       return 0;
 
diff --git a/src/mesa/drivers/x11/xm_api.c b/src/mesa/drivers/x11/xm_api.c
index 6f671969fe..6439d13fa5 100644
--- a/src/mesa/drivers/x11/xm_api.c
+++ b/src/mesa/drivers/x11/xm_api.c
@@ -1557,6 +1557,12 @@ PUBLIC
 void XMesaDestroyContext( XMesaContext c )
 {
    GLcontext *mesaCtx = &c->mesa;
+#ifdef FX
+   XMesaBuffer xmbuf = XMESA_BUFFER(mesaCtx->DrawBuffer);
+
+   if (xmbuf && xmbuf->FXctx)
+      fxMesaDestroyContext(xmbuf->FXctx);
+#endif
    _swsetup_DestroyContext( mesaCtx );
    _swrast_DestroyContext( mesaCtx );
    _tnl_DestroyContext( mesaCtx );
@@ -1572,20 +1578,25 @@ void XMesaDestroyContext( XMesaContext c )
  * X window or pixmap.
  * \param v  the window's XMesaVisual
  * \param w  the window we're wrapping
+ * \param c  context used to initialize the buffer if 3Dfx mode in use.
  * \return  new XMesaBuffer or NULL if error
  */
-PUBLIC XMesaBuffer
-XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
+XMesaBuffer
+XMesaCreateWindowBuffer2(XMesaVisual v, XMesaWindow w, XMesaContext c)
 {
 #ifndef XFree86Server
    XWindowAttributes attr;
 #endif
+#ifdef FX
+   char *fxEnvVar;
+#endif
    int client = 0;
    XMesaBuffer b;
    XMesaColormap cmap;
 
    assert(v);
    assert(w);
+   (void) c;
 
    /* Check that window depth matches visual depth */
 #ifdef XFree86Server
@@ -1631,10 +1642,96 @@ XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
       return NULL;
    }
 
+#ifdef FX
+   fxEnvVar = _mesa_getenv("MESA_GLX_FX");
+   if (fxEnvVar) {
+     if (fxEnvVar[0]!='d') {
+       int attribs[100];
+       int numAttribs = 0;
+       int hw;
+       if (v->mesa_visual.depthBits > 0) {
+	 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
+	 attribs[numAttribs++] = v->mesa_visual.depthBits;
+       }
+       if (v->mesa_visual.doubleBufferMode) {
+	 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
+       }
+       if (v->mesa_visual.accumRedBits > 0) {
+	 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
+	 attribs[numAttribs++] = v->mesa_visual.accumRedBits;
+       }
+       if (v->mesa_visual.stencilBits > 0) {
+         attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
+         attribs[numAttribs++] = v->mesa_visual.stencilBits;
+       }
+       if (v->mesa_visual.alphaBits > 0) {
+         attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
+         attribs[numAttribs++] = v->mesa_visual.alphaBits;
+       }
+       if (1) {
+         attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
+         attribs[numAttribs++] = (int) &(c->mesa);
+       }
+       attribs[numAttribs++] = FXMESA_NONE;
+
+       /* [dBorca] we should take an envvar for `fxMesaSelectCurrentBoard'!!! */
+       hw = fxMesaSelectCurrentBoard(0);
+
+       /* if these fail, there's a new bug somewhere */
+       ASSERT(b->mesa_buffer.Width > 0);
+       ASSERT(b->mesa_buffer.Height > 0);
+
+       if ((hw == GR_SSTTYPE_VOODOO) || (hw == GR_SSTTYPE_Voodoo2)) {
+         b->FXctx = fxMesaCreateBestContext(0, b->mesa_buffer.Width,
+                                            b->mesa_buffer.Height, attribs);
+         if ((v->undithered_pf!=PF_Index) && (b->backxrb->ximage)) {
+	   b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
+	   if (b->FXctx && (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')) {
+	     b->FXwindowHack = GL_TRUE;
+	     FX_grSstControl(GR_CONTROL_DEACTIVATE);
+	   }
+           else {
+	     b->FXwindowHack = GL_FALSE;
+	   }
+         }
+       }
+       else {
+         if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
+	   b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
+					  GR_REFRESH_75Hz, attribs);
+         else
+	   b->FXctx = fxMesaCreateBestContext(0, b->mesa_buffer.Width,
+                                              b->mesa_buffer.Height, attribs);
+         b->FXisHackUsable = GL_FALSE;
+         b->FXwindowHack = GL_FALSE;
+       }
+       /*
+       fprintf(stderr,
+               "voodoo %d, wid %d height %d hack: usable %d active %d\n",
+               hw, b->mesa_buffer.Width, b->mesa_buffer.Height,
+	       b->FXisHackUsable, b->FXwindowHack);
+       */
+     }
+   }
+   else {
+      _mesa_warning(NULL, "WARNING: This Mesa Library includes the Glide driver but\n");
+      _mesa_warning(NULL, "         you have not defined the MESA_GLX_FX env. var.\n");
+      _mesa_warning(NULL, "         (check the README.3DFX file for more information).\n\n");
+      _mesa_warning(NULL, "         you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
+   }
+#endif
+
    return b;
 }
 
 
+PUBLIC XMesaBuffer
+XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
+{
+   return XMesaCreateWindowBuffer2( v, w, NULL );
+}
+
+
 /**
  * Create a new XMesaBuffer from an X pixmap.
  *
@@ -1760,6 +1857,15 @@ GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
       if (!drawBuffer || !readBuffer)
          return GL_FALSE;  /* must specify buffers! */
 
+#ifdef FX
+      if (drawBuffer->FXctx) {
+         fxMesaMakeCurrent(drawBuffer->FXctx);
+
+         c->xm_buffer = drawBuffer;
+
+         return GL_TRUE;
+      }
+#endif
       if (&(c->mesa) == _mesa_get_current_context()
           && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
           && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
@@ -1900,12 +2006,141 @@ GLboolean XMesaCopyContext( XMesaContext xm_src, XMesaContext xm_dst, GLuint mas
  */
 GLboolean XMesaSetFXmode( GLint mode )
 {
+#ifdef FX
+   const char *fx = _mesa_getenv("MESA_GLX_FX");
+   if (fx && fx[0] != 'd') {
+      GET_CURRENT_CONTEXT(ctx);
+      GrHwConfiguration hw;
+      if (!FX_grSstQueryHardware(&hw)) {
+         /*fprintf(stderr, "!grSstQueryHardware\n");*/
+         return GL_FALSE;
+      }
+      if (hw.num_sst < 1) {
+         /*fprintf(stderr, "hw.num_sst < 1\n");*/
+         return GL_FALSE;
+      }
+      if (ctx) {
+         /* [dBorca] Hack alert: 
+	  * oh, this is sooo wrong: ctx above is
+	  * really an fxMesaContext, not an XMesaContext
+	  */
+         XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
+         if (mode == XMESA_FX_WINDOW) {
+	    if (xmbuf->FXisHackUsable) {
+	       FX_grSstControl(GR_CONTROL_DEACTIVATE);
+	       xmbuf->FXwindowHack = GL_TRUE;
+	       return GL_TRUE;
+	    }
+	 }
+	 else if (mode == XMESA_FX_FULLSCREEN) {
+	    FX_grSstControl(GR_CONTROL_ACTIVATE);
+	    xmbuf->FXwindowHack = GL_FALSE;
+	    return GL_TRUE;
+	 }
+	 else {
+	    /* Error: Bad mode value */
+	 }
+      }
+   }
+   /*fprintf(stderr, "fallthrough\n");*/
+#else
    (void) mode;
+#endif
    return GL_FALSE;
 }
 
 
 
+#ifdef FX
+/*
+ * Read image from VooDoo frame buffer into X/Mesa's back XImage.
+ */
+static void FXgetImage( XMesaBuffer b )
+{
+   GET_CURRENT_CONTEXT(ctx);
+   static unsigned short pixbuf[MAX_WIDTH];
+   GLuint x, y;
+   GLuint width, height;
+   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+
+#ifdef XFree86Server
+   x = b->frontxrb->pixmap->x;
+   y = b->frontxrb->pixmap->y;
+   width = b->frontxrb->pixmap->width;
+   height = b->frontxrb->pixmap->height;
+   depth = b->frontxrb->pixmap->depth;
+#else
+   xmesa_get_window_size(b->display, b, &width, &height);
+   x = y = 0;
+#endif
+   if (b->mesa_buffer.Width != width || b->mesa_buffer.Height != height) {
+      b->mesa_buffer.Width = MIN2((int)width, b->FXctx->width);
+      b->mesa_buffer.Height = MIN2((int)height, b->FXctx->height);
+      if (b->mesa_buffer.Width & 1)
+         b->mesa_buffer.Width--;  /* prevent odd width */
+   }
+
+   /* [dBorca] we're always in the right GR_COLORFORMAT... aren't we? */
+   /* grLfbWriteColorFormat(GR_COLORFORMAT_ARGB); */
+   if (b->xm_visual->undithered_pf==PF_5R6G5B) {
+      /* Special case: 16bpp RGB */
+      grLfbReadRegion( GR_BUFFER_FRONTBUFFER,       /* src buffer */
+                       0, b->FXctx->height - b->mesa_buffer.Height,  /*pos*/
+                       b->mesa_buffer.Width, b->mesa_buffer.Height,  /* size */
+                       b->mesa_buffer.Width * sizeof(GLushort), /* stride */
+                       b->backxrb->ximage->data);         /* dest buffer */
+   }
+   else if (b->xm_visual->dithered_pf==PF_Dither
+	    && GET_VISUAL_DEPTH(b->xm_visual)==8) {
+      /* Special case: 8bpp RGB */
+      for (y=0;y<b->mesa_buffer.Height;y++) {
+         GLubyte *ptr = (GLubyte*) b->backxrb->ximage->data
+                        + b->backxrb->ximage->bytes_per_line * y;
+         XDITHER_SETUP(y);
+
+         /* read row from 3Dfx frame buffer */
+         grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
+                          0, b->FXctx->height-(b->mesa_buffer.Height-y),
+                          b->mesa_buffer.Width, 1,
+                          0,
+                          pixbuf );
+
+         /* write to XImage back buffer */
+         for (x=0;x<b->mesa_buffer.Width;x++) {
+            GLubyte r = (pixbuf[x] & 0xf800) >> 8;
+            GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
+            GLubyte b = (pixbuf[x] & 0x001f) << 3;
+            *ptr++ = XDITHER( x, r, g, b);
+         }
+      }
+   }
+   else {
+      /* General case: slow! */
+      for (y=0;y<b->mesa_buffer.Height;y++) {
+         /* read row from 3Dfx frame buffer */
+         grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
+                          0, b->FXctx->height-(b->mesa_buffer.Height-y),
+                          b->mesa_buffer.Width, 1,
+                          0,
+                          pixbuf );
+
+         /* write to XImage back buffer */
+         for (x=0;x<b->mesa_buffer.Width;x++) {
+            XMesaPutPixel(b->backxrb->ximage,x,y,
+			  xmesa_color_to_pixel(ctx,
+					       (pixbuf[x] & 0xf800) >> 8,
+					       (pixbuf[x] & 0x07e0) >> 3,
+					       (pixbuf[x] & 0x001f) << 3,
+					       0xff,
+                                               b->xm_visual->undithered_pf));
+         }
+      }
+   }
+   /* grLfbWriteColorFormat(GR_COLORFORMAT_ABGR); */
+}
+#endif
+
+
 /*
  * Copy the back buffer to the front buffer.  If there's no back buffer
  * this is a no-op.
@@ -1927,6 +2162,16 @@ void XMesaSwapBuffers( XMesaBuffer b )
       _mesa_notifySwapBuffers(ctx);
 
    if (b->db_mode) {
+#ifdef FX
+      if (b->FXctx) {
+         fxMesaSwapBuffers();
+
+         if (b->FXwindowHack)
+            FXgetImage(b);
+         else
+            return;
+      }
+#endif
      if (b->backxrb->ximage) {
 	 /* Copy Ximage (back buf) from client memory to server window */
 #if defined(USE_XSHM) && !defined(XFree86Server)
@@ -1993,6 +2238,15 @@ void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
 
    if (b->db_mode) {
       int yTop = b->mesa_buffer.Height - y - height;
+#ifdef FX
+      if (b->FXctx) {
+         fxMesaSwapBuffers();
+         if (b->FXwindowHack)
+            FXgetImage(b);
+         else
+            return;
+      }
+#endif
       if (b->backxrb->ximage) {
          /* Copy Ximage from host's memory to server's window */
 #if defined(USE_XSHM) && !defined(XFree86Server)
diff --git a/src/mesa/drivers/x11/xmesaP.h b/src/mesa/drivers/x11/xmesaP.h
index 7b72e6b2f9..98d03ccf62 100644
--- a/src/mesa/drivers/x11/xmesaP.h
+++ b/src/mesa/drivers/x11/xmesaP.h
@@ -29,7 +29,10 @@
 
 #include "GL/xmesa.h"
 #include "mtypes.h"
-
+#if defined(FX)
+#include "GL/fxmesa.h"
+#include "../glide/fxdrv.h"
+#endif
 #ifdef XFree86Server
 #include "xm_image.h"
 #endif
@@ -257,6 +260,13 @@ struct xmesa_buffer {
    unsigned long alloced_colors[256];
 #endif
 
+#if defined( FX )
+   /* For 3Dfx Glide only */
+   GLboolean FXisHackUsable;	/* Can we render into window? */
+   GLboolean FXwindowHack;	/* Are we rendering into a window? */
+   fxMesaContext FXctx;
+#endif
+
    struct xmesa_buffer *Next;	/* Linked list pointer: */
 };
 
@@ -557,6 +567,13 @@ extern void xmesa_choose_triangle( GLcontext *ctx );
 extern void xmesa_register_swrast_functions( GLcontext *ctx );
 
 
+
+/* XXX this is a hack to implement shared display lists with 3Dfx */
+extern XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v,
+					     XMesaWindow w,
+					     XMesaContext c );
+
+
 #define ENABLE_EXT_texure_compression_s3tc 0 /* SW texture compression */
 
 #ifdef XFree86Server