mesa: Make a Mesa core function for sRGB render encoding handling.

v2: const-qualify ctx, and add a comment about the function (recommended
    by Brian and Kenneth).

Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]> (v1)

2 files changed, 21 insertions, 0 deletions

diff --git a/src/mesa/main/blend.c b/src/mesa/main/blend.c
index 7413b156233..0c28352b236 100644
--- a/src/mesa/main/blend.c
+++ b/src/mesa/main/blend.c
@@ -856,6 +856,23 @@ _mesa_update_clamp_vertex_color(struct gl_context *ctx)
    ctx->Light._ClampVertexColor = _mesa_get_clamp_vertex_color(ctx);
 }
 
+/**
+ * Returns an appropriate gl_format for color rendering based on the
+ * GL_FRAMEBUFFER_SRGB state.
+ *
+ * Some drivers implement GL_FRAMEBUFFER_SRGB using a flag on the blend state
+ * (which GL_FRAMEBUFFER_SRGB maps to reasonably), but some have to do so by
+ * overriding the format of the surface.  This is a helper for doing the
+ * surface format override variant.
+ */
+gl_format
+_mesa_get_render_format(const struct gl_context *ctx, gl_format format)
+{
+   if (ctx->Color.sRGBEnabled)
+      return format;
+   else
+      return _mesa_get_srgb_format_linear(format);
+}
 
 /**********************************************************************/
 /** \name Initialization */
diff --git a/src/mesa/main/blend.h b/src/mesa/main/blend.h
index 5b7a0259102..b43b3ccb315 100644
--- a/src/mesa/main/blend.h
+++ b/src/mesa/main/blend.h
@@ -35,6 +35,7 @@
 
 
 #include "glheader.h"
+#include "formats.h"
 
 struct gl_context;
 
@@ -115,6 +116,9 @@ _mesa_update_clamp_fragment_color(struct gl_context *ctx);
 extern void
 _mesa_update_clamp_vertex_color(struct gl_context *ctx);
 
+extern gl_format
+_mesa_get_render_format(const struct gl_context *ctx, gl_format format);
+
 extern void  
 _mesa_init_color( struct gl_context * ctx );