mesa/i965: Refactor brw_is_front_buffer_{drawing,reading} to common code

There are multiple similar implementations of these functions, and a
later patch was going to add another.

v2: Move removing intel_framebuffer to a different patch.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Iago Toral Quiroga <[email protected]>

2 files changed, 25 insertions, 0 deletions

diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
index 5b6b3f64581..d18166d528e 100644
--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -964,3 +964,22 @@ _mesa_print_framebuffer(const struct gl_framebuffer *fb)
       }
    }
 }
+
+bool
+_mesa_is_front_buffer_reading(const struct gl_framebuffer *fb)
+{
+   if (!fb || _mesa_is_user_fbo(fb))
+      return false;
+
+   return fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT;
+}
+
+bool
+_mesa_is_front_buffer_drawing(const struct gl_framebuffer *fb)
+{
+   if (!fb || _mesa_is_user_fbo(fb))
+      return false;
+
+   return (fb->_NumColorDrawBuffers >= 1 &&
+           fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT);
+}
diff --git a/src/mesa/main/framebuffer.h b/src/mesa/main/framebuffer.h
index 08e43222045..bfc8a0836e7 100644
--- a/src/mesa/main/framebuffer.h
+++ b/src/mesa/main/framebuffer.h
@@ -139,4 +139,10 @@ _mesa_get_read_renderbuffer_for_format(const struct gl_context *ctx,
 extern void
 _mesa_print_framebuffer(const struct gl_framebuffer *fb);
 
+extern bool
+_mesa_is_front_buffer_reading(const struct gl_framebuffer *fb);
+
+extern bool
+_mesa_is_front_buffer_drawing(const struct gl_framebuffer *fb);
+
 #endif /* FRAMEBUFFER_H */