1 files changed, 15 insertions, 1 deletions
diff --git a/src/mesa/main/clear.c b/src/mesa/main/clear.c
index ca0ecd95b8c..0a51a868bae 100644
--- a/src/mesa/main/clear.c
+++ b/src/mesa/main/clear.c
@@ -30,6 +30,7 @@
 
 
 
+#include "glformats.h"
 #include "glheader.h"
 #include "clear.h"
 #include "context.h"
@@ -589,7 +590,20 @@ clear_bufferfv(struct gl_context *ctx, GLenum buffer, GLint drawbuffer,
           * hook instead.
           */
          const GLclampd clearSave = ctx->Depth.Clear;
-         ctx->Depth.Clear = *value;
+
+         /* Page 263 (page 279 of the PDF) of the OpenGL 3.0 spec says:
+          *
+          *     "If buffer is DEPTH, drawbuffer must be zero, and value points
+          *     to the single depth value to clear the depth buffer to.
+          *     Clamping and type conversion for fixed-point depth buffers are
+          *     performed in the same fashion as for ClearDepth."
+          */
+         const struct gl_renderbuffer *rb =
+            ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+         const bool is_float_depth =
+            _mesa_has_depth_float_channel(rb->InternalFormat);
+         ctx->Depth.Clear = is_float_depth ? *value : SATURATE(*value);
+
          ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH);
          ctx->Depth.Clear = clearSave;
       }