main: Refactor _mesa_update_framebuffer.

_mesa_update_framebuffer now operates on arbitrary read and draw framebuffers.
This allows BlitNamedFramebuffer to update the state of its arbitrary read and
draw framebuffers.

Reviewed-by: Fredrik Höglund <fredrik@kde.org>
Signed-off-by: Fredrik Höglund <fredrik@kde.org>

src/mesa/drivers/dri/i915/i830_vtbl.c

@@ -730,7 +730,7 @@ i830_update_draw_buffer(struct intel_context *intel)
     */
    if (ctx->NewState & _NEW_BUFFERS) {
       /* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */
-      _mesa_update_framebuffer(ctx);
+      _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
       /* this updates the DrawBuffer's Width/Height if it's a FBO */
       _mesa_update_draw_buffer_bounds(ctx);
    }

src/mesa/drivers/dri/i915/i915_vtbl.c

@@ -732,7 +732,7 @@ i915_update_draw_buffer(struct intel_context *intel)
     */
    if (ctx->NewState & _NEW_BUFFERS) {
       /* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */
-      _mesa_update_framebuffer(ctx);
+      _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
       /* this updates the DrawBuffer's Width/Height if it's a FBO */
       _mesa_update_draw_buffer_bounds(ctx);
    }

src/mesa/drivers/dri/r200/r200_state.c

@@ -2215,7 +2215,7 @@ GLboolean r200ValidateState( struct gl_context *ctx )
    GLuint new_state = rmesa->radeon.NewGLState;
 
    if (new_state & _NEW_BUFFERS) {
-      _mesa_update_framebuffer(ctx);
+      _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
       /* this updates the DrawBuffer's Width/Height if it's a FBO */
       _mesa_update_draw_buffer_bounds(ctx);
 

src/mesa/drivers/dri/radeon/radeon_common.c

@@ -220,7 +220,7 @@ void radeon_draw_buffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 	 */
 	if (ctx->NewState & (_NEW_BUFFERS | _NEW_COLOR | _NEW_PIXEL)) {
 		/* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */
-		_mesa_update_framebuffer(ctx);
+		_mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
 		/* this updates the DrawBuffer's Width/Height if it's a FBO */
 		_mesa_update_draw_buffer_bounds(ctx);
 	}

src/mesa/drivers/dri/radeon/radeon_state.c

@@ -1994,7 +1994,7 @@ GLboolean radeonValidateState( struct gl_context *ctx )
    GLuint new_state = rmesa->radeon.NewGLState;
 
    if (new_state & _NEW_BUFFERS) {
-     _mesa_update_framebuffer(ctx);
+     _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
      /* this updates the DrawBuffer's Width/Height if it's a FBO */
      _mesa_update_draw_buffer_bounds(ctx);
      RADEON_STATECHANGE(rmesa, ctx);

src/mesa/main/framebuffer.c

@@ -678,17 +678,14 @@ update_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 
 
 /**
- * Update state related to the current draw/read framebuffers.
+ * Update state related to the draw/read framebuffers.
  */
 void
-_mesa_update_framebuffer(struct gl_context *ctx)
+_mesa_update_framebuffer(struct gl_context *ctx,
+                         struct gl_framebuffer *readFb,
+                         struct gl_framebuffer *drawFb)
 {
-   struct gl_framebuffer *drawFb;
-   struct gl_framebuffer *readFb;
-
    assert(ctx);
-   drawFb = ctx->DrawBuffer;
-   readFb = ctx->ReadBuffer;
 
    update_framebuffer(ctx, drawFb);
    if (readFb != drawFb)

src/mesa/main/framebuffer.h

@@ -84,7 +84,9 @@ _mesa_update_framebuffer_visual(struct gl_context *ctx,
 				struct gl_framebuffer *fb);
 
 extern void
-_mesa_update_framebuffer(struct gl_context *ctx);
+_mesa_update_framebuffer(struct gl_context *ctx,
+                         struct gl_framebuffer *readFb,
+                         struct gl_framebuffer *drawFb);
 
 extern GLboolean
 _mesa_source_buffer_exists(struct gl_context *ctx, GLenum format);

src/mesa/main/state.c

@@ -389,7 +389,7 @@ _mesa_update_state_locked( struct gl_context *ctx )
       update_frontbit( ctx );
 
    if (new_state & _NEW_BUFFERS)
-      _mesa_update_framebuffer(ctx);
+      _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
 
    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
       _mesa_update_draw_buffer_bounds( ctx );