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...

2 files changed, 8 insertions, 9 deletions

diff --git a/src/mesa/drivers/dri/nouveau/nouveau_driver.c b/src/mesa/drivers/dri/nouveau/nouveau_driver.c
index 8b76779002b..1135817fe9a 100644
--- a/src/mesa/drivers/dri/nouveau/nouveau_driver.c
+++ b/src/mesa/drivers/dri/nouveau/nouveau_driver.c
@@ -149,12 +149,12 @@ static void nouveauClear( GLcontext *ctx, GLbitfield mask )
 		clear_value = PACK_COLOR_8888(c[3],c[0],c[1],c[2]);
 
 		if (ctx->DrawBuffer) {
-			/* FIXME: find correct color buffer, instead of [0][0] */
-			if (ctx->DrawBuffer->_ColorDrawBuffers[0][0]) {
-				color_bits = ctx->DrawBuffer->_ColorDrawBuffers[0][0]->RedBits;
-				color_bits += ctx->DrawBuffer->_ColorDrawBuffers[0][0]->GreenBits;
-				color_bits += ctx->DrawBuffer->_ColorDrawBuffers[0][0]->BlueBits;
-				color_bits += ctx->DrawBuffer->_ColorDrawBuffers[0][0]->AlphaBits;
+			/* FIXME: find correct color buffer, instead of [0] */
+			if (ctx->DrawBuffer->_ColorDrawBuffers[0]) {
+				color_bits = ctx->DrawBuffer->_ColorDrawBuffers[0]->RedBits;
+				color_bits += ctx->DrawBuffer->_ColorDrawBuffers[0]->GreenBits;
+				color_bits += ctx->DrawBuffer->_ColorDrawBuffers[0]->BlueBits;
+				color_bits += ctx->DrawBuffer->_ColorDrawBuffers[0]->AlphaBits;
 			}
 		}
 
diff --git a/src/mesa/drivers/dri/nouveau/nouveau_fbo.c b/src/mesa/drivers/dri/nouveau/nouveau_fbo.c
index cc3da8b9bde..23525509d14 100644
--- a/src/mesa/drivers/dri/nouveau/nouveau_fbo.c
+++ b/src/mesa/drivers/dri/nouveau/nouveau_fbo.c
@@ -177,8 +177,7 @@ nouveau_window_moved(GLcontext * ctx)
 	nouveauContextPtr nmesa = NOUVEAU_CONTEXT(ctx);
 	nouveau_renderbuffer_t *nrb;
 
-	nrb = (nouveau_renderbuffer_t *)
-		ctx->DrawBuffer->_ColorDrawBuffers[0][0];
+	nrb = (nouveau_renderbuffer_t *) ctx->DrawBuffer->_ColorDrawBuffers[0];
 	if (!nrb)
 		return;
 
@@ -204,7 +203,7 @@ nouveau_build_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
 	_mesa_update_framebuffer(ctx);
 	_mesa_update_draw_buffer_bounds(ctx);
 
-	color[0] = (nouveau_renderbuffer_t *) fb->_ColorDrawBuffers[0][0];
+	color[0] = (nouveau_renderbuffer_t *) fb->_ColorDrawBuffers[0];
 	if (fb->_DepthBuffer && fb->_DepthBuffer->Wrapped)
 		depth = (nouveau_renderbuffer_t *) fb->_DepthBuffer->Wrapped;
 	else