[Mesa-dev] [PATCH 2/8] gallium: add helper to use as a replacement for the MIXED_COLOR cap

[Ilia Mirkin]

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
 src/gallium/auxiliary/util/u_format.c | 20 ++++++++++++++++++++
 src/gallium/auxiliary/util/u_format.h | 11 +++++++++++
 2 files changed, 31 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_format.c b/src/gallium/auxiliary/util/u_format.c
index a8aa571..8b9fb15 100644
--- a/src/gallium/auxiliary/util/u_format.c
+++ b/src/gallium/auxiliary/util/u_format.c
@@ -208,6 +208,26 @@ util_format_is_supported(enum pipe_format format, unsigned bind)
 }
 
 
+boolean
+util_format_same_cbuf_formats(
+      const struct pipe_screen *screen,
+      int num_color_formats,
+      const enum pipe_format *color_formats,
+      enum pipe_format zsformat)
+{
+   enum pipe_format color = PIPE_FORMAT_NONE;
+   int i;
+
+   for (i = 0; i < num_color_formats; i++) {
+      if (color == PIPE_FORMAT_NONE)
+         color = color_formats[i];
+      if (color != color_formats[i])
+         return FALSE;
+   }
+
+   return TRUE;
+}
+
 void
 util_format_read_4f(enum pipe_format format,
                     float *dst, unsigned dst_stride,
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 84f16d5..49b5656 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -35,6 +35,7 @@
 #include "util/u_debug.h"
 
 union pipe_color_union;
+struct pipe_screen;
 
 
 #ifdef __cplusplus
@@ -665,6 +666,16 @@ boolean
 util_format_is_supported(enum pipe_format format, unsigned bind);
 
 /**
+ * Whether all the color buffers are the same.
+ */
+boolean
+util_format_same_cbuf_formats(
+      const struct pipe_screen *screen,
+      int num_color_formats,
+      const enum pipe_format *color_formats,
+      enum pipe_format zsformat);
+
+/**
  * Whether this format is a rgab8 variant.
  *
  * That is, any format that matches the
-- 
1.8.1.5