Simplify ctx->_NumColorDrawBuffers, _ColorDrawBuffers and fix bug 13835.

These fields are no longer indexed by shader output.  Now, we just have
a simple array of renderbuffer pointers.

If the shader writes to gl_FragData[i], send those colors to the N
_ColorDrawBuffers.  Otherwise, replicate the single gl_FragColor (or
the fixed-function color) to the N _ColorDrawBuffers.

A few more changes and simplifications can follow from this...

3 files changed, 8 insertions, 8 deletions

diff --git a/src/mesa/drivers/x11/xm_dd.c b/src/mesa/drivers/x11/xm_dd.c
index 4c8bf5f656d..e7d41401f9a 100644
--- a/src/mesa/drivers/x11/xm_dd.c
+++ b/src/mesa/drivers/x11/xm_dd.c
@@ -435,7 +435,7 @@ xmesa_DrawPixels_8R8G8B( GLcontext *ctx,
                          const GLvoid *pixels )
 {
    const SWcontext *swrast = SWRAST_CONTEXT( ctx );
-   struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0][0];
+   struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
    struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb->Wrapped);
 
    if (swrast->NewState)
@@ -544,7 +544,7 @@ xmesa_DrawPixels_5R6G5B( GLcontext *ctx,
                          const GLvoid *pixels )
 {
    struct xmesa_renderbuffer *xrb
-      = xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0][0]->Wrapped);
+      = xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]->Wrapped);
    const XMesaContext xmesa = XMESA_CONTEXT(ctx);
    const SWcontext *swrast = SWRAST_CONTEXT( ctx );
    XMesaDisplay *dpy = xmesa->xm_visual->display;
@@ -654,7 +654,7 @@ xmesa_CopyPixels( GLcontext *ctx,
    struct xmesa_renderbuffer *srcXrb
       = xmesa_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer->Wrapped);
    struct xmesa_renderbuffer *dstXrb
-      = xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0][0]->Wrapped);
+      = xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]->Wrapped);
 
    ASSERT(dpy);
    ASSERT(gc);
diff --git a/src/mesa/drivers/x11/xm_line.c b/src/mesa/drivers/x11/xm_line.c
index deeae5019c4..7109c439157 100644
--- a/src/mesa/drivers/x11/xm_line.c
+++ b/src/mesa/drivers/x11/xm_line.c
@@ -121,7 +121,7 @@ void xmesa_choose_point( GLcontext *ctx )
 
 
 #define GET_XRB(XRB)  struct xmesa_renderbuffer *XRB = \
-   xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0][0]->Wrapped)
+   xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]->Wrapped)
 
 
 /*
@@ -598,7 +598,7 @@ get_line_func(GLcontext *ctx)
    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][0]->Wrapped);
+   xrb = xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]->Wrapped);
 
    if (xrb->ximage
        && swrast->_RasterMask==DEPTH_BIT
@@ -661,7 +661,7 @@ get_line_func(GLcontext *ctx)
    }
 
 #ifndef XFree86Server
-   if (ctx->DrawBuffer->_NumColorDrawBuffers[0] == 1
+   if (ctx->DrawBuffer->_NumColorDrawBuffers == 1
        && ctx->DrawBuffer->_ColorDrawBufferMask[0] == BUFFER_BIT_FRONT_LEFT
        && swrast->_RasterMask == LOGIC_OP_BIT
        && ctx->Color.LogicOp == GL_XOR
diff --git a/src/mesa/drivers/x11/xm_tri.c b/src/mesa/drivers/x11/xm_tri.c
index 95c6d7c1d20..a3978abdd07 100644
--- a/src/mesa/drivers/x11/xm_tri.c
+++ b/src/mesa/drivers/x11/xm_tri.c
@@ -45,7 +45,7 @@
 
 
 #define GET_XRB(XRB)  struct xmesa_renderbuffer *XRB = \
-   xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0][0]->Wrapped)
+   xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]->Wrapped)
 
 
 /**********************************************************************/
@@ -1479,7 +1479,7 @@ get_triangle_func(GLcontext *ctx)
    if (xmbuf->swAlpha)
       return (swrast_tri_func) NULL;
 
-   xrb = xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0][0]->Wrapped);
+   xrb = xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]->Wrapped);
 
    if (xrb->ximage) {
       if (   ctx->Light.ShadeModel==GL_SMOOTH