gallium: move clear paths from rgba to a pointer to a color union (v2)

This moves the gallium interface for clears from using a pointer to 4 floats to a pointer to a union of float/unsigned/int values.

Notes:
1. the value is opaque.
2. only when the value is used should it be interpretered according to
the surface format it is going to be used with.
3. float clears on integer buffers and vice-versa are undefined.

v2: fixed up vega and graw, dropped hunks that shouldn't have been in
patch.

Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 11 insertions, 5 deletions

diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index 49c12ec64fb..b2d5f9543e6 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -63,7 +63,7 @@ struct pipe_vertex_element;
 struct pipe_video_buffer;
 struct pipe_video_decoder;
 struct pipe_viewport_state;
-
+union pipe_color_union;
 
 /**
  * Gallium rendering context.  Basically:
@@ -281,23 +281,23 @@ struct pipe_context {
     * The entire buffers are cleared (no scissor, no colormask, etc).
     *
     * \param buffers  bitfield of PIPE_CLEAR_* values.
-    * \param rgba  pointer to an array of one float for each of r, g, b, a.
+    * \param color  pointer to a union of fiu array for each of r, g, b, a.
     * \param depth  depth clear value in [0,1].
     * \param stencil  stencil clear value
     */
    void (*clear)(struct pipe_context *pipe,
                  unsigned buffers,
-                 const float *rgba,
+                 const union pipe_color_union *color,
                  double depth,
                  unsigned stencil);
 
    /**
     * Clear a color rendertarget surface.
-    * \param rgba  pointer to an array of one float for each of r, g, b, a.
+    * \param color  pointer to an union of fiu array for each of r, g, b, a.
     */
    void (*clear_render_target)(struct pipe_context *pipe,
                                struct pipe_surface *dst,
-                               const float *rgba,
+                               const union pipe_color_union *color,
                                unsigned dstx, unsigned dsty,
                                unsigned width, unsigned height);
 
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 777a177a90f..1773d9d3175 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -515,6 +515,12 @@ struct pipe_query_data_timestamp_disjoint
    boolean  disjoint;
 };
 
+union pipe_color_union
+{
+   float f[4];
+   int i[4];
+   unsigned int ui[4];
+};
 
 #ifdef __cplusplus
 }