Mesa (master): xlib: remove software alpha buffer support

[Brian Paul]

Module: Mesa
Branch: master
Commit: dff2394e08651304d924ef9df796ff0ac6b844c3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=dff2394e08651304d924ef9df796ff0ac6b844c3

Author: Brian Paul <brianp at vmware.com>
Date:   Sat Nov 12 11:50:31 2011 -0700

xlib: remove software alpha buffer support

Seldom used and this won't work when we move to using Map/UnmapRenderbuffer
everywhere.  This will let us remove a bunch of core Mesa code too.

Reviewed-by: Eric Anholt <eric at anholt.net>

---

 src/mesa/drivers/x11/xm_api.c  |   20 +-------------------
 src/mesa/drivers/x11/xm_line.c |    2 --
 src/mesa/drivers/x11/xm_tri.c  |    3 ---
 src/mesa/drivers/x11/xmesaP.h  |    2 --
 4 files changed, 1 insertions(+), 26 deletions(-)

diff --git a/src/mesa/drivers/x11/xm_api.c b/src/mesa/drivers/x11/xm_api.c
index 13b35c7..5513f68 100644
--- a/src/mesa/drivers/x11/xm_api.c
+++ b/src/mesa/drivers/x11/xm_api.c
@@ -391,21 +391,6 @@ create_xmesa_buffer(XMesaDrawable d, BufferType type,
    }
 
    /*
-    * Software alpha planes
-    */
-   if (vis->mesa_visual.alphaBits > 0
-       && vis->undithered_pf != PF_8A8B8G8R
-       && vis->undithered_pf != PF_8A8R8G8B) {
-      /* Visual has alpha, but pixel format doesn't support it.
-       * We'll use an alpha renderbuffer wrapper.
-       */
-      b->swAlpha = GL_TRUE;
-   }
-   else {
-      b->swAlpha = GL_FALSE;
-   }
-
-   /*
     * Other renderbuffer (depth, stencil, etc)
     */
    _mesa_add_soft_renderbuffers(&b->mesa_buffer,
@@ -413,7 +398,7 @@ create_xmesa_buffer(XMesaDrawable d, BufferType type,
                                 vis->mesa_visual.haveDepthBuffer,
                                 vis->mesa_visual.haveStencilBuffer,
                                 vis->mesa_visual.haveAccumBuffer,
-                                b->swAlpha,
+                                GL_FALSE,  /* software alpha buffer */
                                 vis->mesa_visual.numAuxBuffers > 0 );
 
    /* GLX_EXT_texture_from_pixmap */
@@ -1865,9 +1850,6 @@ void XMesaSwapBuffers( XMesaBuffer b )
 		      );
          /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
       }
-
-      if (b->swAlpha)
-         _mesa_copy_soft_alpha_renderbuffers(ctx, &b->mesa_buffer);
    }
    XSync( b->xm_visual->display, False );
 }
diff --git a/src/mesa/drivers/x11/xm_line.c b/src/mesa/drivers/x11/xm_line.c
index 04cedcd..5f60f4b 100644
--- a/src/mesa/drivers/x11/xm_line.c
+++ b/src/mesa/drivers/x11/xm_line.c
@@ -581,7 +581,6 @@ get_line_func(struct gl_context *ctx)
 #if CHAN_BITS == 8
    SWcontext *swrast = SWRAST_CONTEXT(ctx);
    XMesaContext xmesa = XMESA_CONTEXT(ctx);
-   XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
    const int depth = GET_VISUAL_DEPTH(xmesa->xm_visual);
    const struct xmesa_renderbuffer *xrb;
 
@@ -594,7 +593,6 @@ get_line_func(struct gl_context *ctx)
    if (ctx->Light.ShadeModel != GL_FLAT)  return (swrast_line_func) NULL;
    if (ctx->Line.StippleFlag)             return (swrast_line_func) NULL;
    if (swrast->_RasterMask & MULTI_DRAW_BIT) return (swrast_line_func) NULL;
-   if (xmbuf->swAlpha)                    return (swrast_line_func) NULL;
 
    xrb = xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]->Wrapped);
 
diff --git a/src/mesa/drivers/x11/xm_tri.c b/src/mesa/drivers/x11/xm_tri.c
index 98dece1..9fc19bb 100644
--- a/src/mesa/drivers/x11/xm_tri.c
+++ b/src/mesa/drivers/x11/xm_tri.c
@@ -1453,7 +1453,6 @@ get_triangle_func(struct gl_context *ctx)
 #if CHAN_BITS == 8
    SWcontext *swrast = SWRAST_CONTEXT(ctx);
    XMesaContext xmesa = XMESA_CONTEXT(ctx);
-   XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
    const int depth = GET_VISUAL_DEPTH(xmesa->xm_visual);
    const struct xmesa_renderbuffer *xrb;
 
@@ -1476,8 +1475,6 @@ get_triangle_func(struct gl_context *ctx)
    if (ctx->Polygon.CullFlag && 
        ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
       return (swrast_tri_func) NULL;
-   if (xmbuf->swAlpha)
-      return (swrast_tri_func) NULL;
 
    xrb = xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]->Wrapped);
 
diff --git a/src/mesa/drivers/x11/xmesaP.h b/src/mesa/drivers/x11/xmesaP.h
index 29f070a..81dc25d 100644
--- a/src/mesa/drivers/x11/xmesaP.h
+++ b/src/mesa/drivers/x11/xmesaP.h
@@ -219,8 +219,6 @@ struct xmesa_buffer {
    GLint db_mode;		/* 0 = single buffered */
 				/* BACK_PIXMAP = use Pixmap for back buffer */
 				/* BACK_XIMAGE = use XImage for back buffer */
-   GLboolean swAlpha;
-
    GLuint shm;			/* X Shared Memory extension status:	*/
 				/*    0 = not available			*/
 				/*    1 = XImage support available	*/