mesa: implement GL_ARB_map_buffer_range

Only enabled for software drivers at this point.

Note that the gl_buffer_object::Access enum field has been replaced by
a gl_buffer_object::AccessFlags bitfield.  The new field is a mask of
the GL_MAP_x_BIT flags which is a superset of the old GL_READ_ONLY,
GL_WRITE_ONLY and GL_READ_WRITE modes.  When we query GL_BUFFER_ACCESS_ARB
we translate the bitfield into the conventional enum values.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 46020eb210..71a85a9db8 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1503,7 +1503,7 @@ struct gl_buffer_object
    GLubyte *Data;       /**< Location of storage either in RAM or VRAM. */
    /** Fields describing a mapped buffer */
    /*@{*/
-   GLenum Access;       /**< GL_READ_ONLY_ARB, GL_WRITE_ONLY_ARB, etc. */
+   GLbitfield AccessFlags; /**< Mask of GL_MAP_x_BIT flags */
    GLvoid *Pointer;     /**< User-space address of mapping */
    GLintptr Offset;     /**< Mapped offset */
    GLsizeiptr Length;   /**< Mapped length */
@@ -2443,6 +2443,7 @@ struct gl_extensions
    GLboolean ARB_framebuffer_object;
    GLboolean ARB_half_float_pixel;
    GLboolean ARB_imaging;
+   GLboolean ARB_map_buffer_range;
    GLboolean ARB_multisample;
    GLboolean ARB_multitexture;
    GLboolean ARB_occlusion_query;