mesa: Round the argument to PixelStoref instead of truncating.

From the GL 2.1 specification, page 114 (page 128 of the PDF):

    "The version of PixelStore that takes a floating-point value
     may be used to set any type of parameter; if the parameter is
     boolean, then it is set to FALSE if the passed value is 0.0
     and TRUE otherwise, while if the parameter is an integer, then
     the passed value is rounded to the nearest integer."

Fixes piglit roundmode-pixelstore.
Note: This is a candidate for the 7.11 branch.

Reviewed-by: Brian Paul <[email protected]>

2 files changed, 9 insertions, 1 deletions

diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index f9da54e73c0..c56062ac6a7 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -2486,6 +2486,7 @@ _mesa_GetFramebufferAttachmentParameterivEXT(GLenum target, GLenum attachment,
 void GLAPIENTRY
 _mesa_GenerateMipmapEXT(GLenum target)
 {
+   struct gl_texture_image *srcImage;
    struct gl_texture_object *texObj;
    GLboolean error;
 
@@ -2532,6 +2533,13 @@ _mesa_GenerateMipmapEXT(GLenum target)
    }
 
    _mesa_lock_texture(ctx, texObj);
+
+   srcImage = _mesa_select_tex_image(ctx, texObj, target, texObj->BaseLevel);
+   if (!srcImage) {
+      _mesa_unlock_texture(ctx, texObj);
+      return;
+   }
+
    if (target == GL_TEXTURE_CUBE_MAP) {
       GLuint face;
       for (face = 0; face < 6; face++)
diff --git a/src/mesa/main/pixelstore.c b/src/mesa/main/pixelstore.c
index d957950ed92..81474491dc5 100644
--- a/src/mesa/main/pixelstore.c
+++ b/src/mesa/main/pixelstore.c
@@ -214,7 +214,7 @@ _mesa_PixelStorei( GLenum pname, GLint param )
 void GLAPIENTRY
 _mesa_PixelStoref( GLenum pname, GLfloat param )
 {
-   _mesa_PixelStorei( pname, (GLint) param );
+   _mesa_PixelStorei( pname, IROUND(param) );
 }