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# ====================================================================
#
#      framebuf.cdl
#
#      Generic framebuffer package configuration data
#
# ====================================================================
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# ====================================================================
######DESCRIPTIONBEGIN####
#
# Author(s):     bartv
# Date:          2005-03-29
#
#####DESCRIPTIONEND####
#========================================================================

cdl_package CYGPKG_IO_FRAMEBUF {
    display             "Framebuffer support"
    doc         ref/io-framebuf.html
    requires    CYGPKG_INFRA CYGPKG_HAL CYGPKG_ERROR
    include_dir cyg/io
    compile             framebuf.c linear.c palette.c

    # A custom build step to generate a single header with details of all
    # the framebuffers for this target. The dependency on <pkgconf/system.h>
    # copes with the case of a framebuffer device driver package being removed
    make -priority 2 {
        $(PREFIX)/include/cyg/io/framebufs/framebufs.h : $(REPOSITORY)/$(PACKAGE)/src/gen_framebufs.tcl \
            $(PREFIX)/include/pkgconf/system.h \
            $(subst $(PREFIX)/include/cyg/io/framebufs/framebufs.h,,$(wildcard $(PREFIX)/include/cyg/io/framebufs/*.h*))
        tclsh $< $(dir $@)
    }
    
    description "
        The generic framebuffer package provides an API for accessing
        one or more framebuffers, plus support for appropriate device
        drivers."

    cdl_interface CYGINT_IO_FRAMEBUF_DEVICES {
        display         "Number of available framebuffer devices"
        flavor          data
        description "
            This interface specifies the number of framebuffer devices
            supported by device driver(s) on this platform."
    }

    cdl_option CYGDAT_IO_FRAMEBUF_DEVICES {
        display         "Names of available framebuffer devices"
        default_value   { "" }
        flavor          data
        description "
            This option provides a list of the framebuffer devices available
            on the current platform. It is controlled by the appropriate
            device driver(s) and should not be edited by users."
    }

    cdl_option CYGDAT_IO_FRAMEBUF_TEST_DEVICE {
        display         "Framebuffer device to use for testing"
        active_if       CYGINT_IO_FRAMEBUF_DEVICES
        flavor          booldata
        default_value   0
        requires        { is_substr(CYGDAT_IO_FRAMEBUF_DEVICES, " " . CYGDAT_IO_FRAMEBUF_TEST_DEVICE . " ") }
        description "
            This option determines the framebuffer device to be used for running
          the testcases. By default the build system will automatically select
          the first entry in CYGDAT_IO_FRAMEBUF_DEVICES, which will be the
          only entry if there is only framebuffer device in the system."
    }
    
    cdl_component CYGPKG_IO_FRAMEBUF_FUNCTIONALITY {
        display         "Functionality supported by the platform's framebuffer(s)"
        flavor          none
        description "
            This component holds details of the functionality provided by the
            framebuffer device driver(s) for the current platform."

        cdl_interface CYGHWR_IO_FRAMEBUF_FUNCTIONALITY_32BPP {
            display     "32bpp pixel support required"
            flavor      booldata
            description "
                This interface will be implemented if any of the framebuffer
                device drivers for the current platform provides a 32 bits
                per pixel display. This constrains the cyg_colour data type
                to be at least 32 bits."
        }
        
        cdl_interface CYGHWR_IO_FRAMEBUF_FUNCTIONALITY_TRUE_COLOUR {
            display     "Framebuffer supports true colour mode"
            flavor      booldata
            define      CYGHWR_IO_FRAMEBUF_FUNCTIONALITY_TRUE_COLOR
            description "
                This interface will be implemented if any of the framebuffer
                device drivers for the current platform support true colour
                operation. In other words the contents of the framebuffer
                defines the colours directly and there is no indirection via
                a palette."
        }

        cdl_interface CYGHWR_IO_FRAMEBUF_FUNCTIONALITY_PALETTE {
            display     "Framebuffer uses a palette for colours"
            flavor      booldata
            description "
                This interface will be implemented if any of the framebuffer
                device drivers for the current platform use a palette. In
                other words the contents of the framebuffer's memory do not
                represent colours directly, but instead are treated as indices
                into a separate table known as the palette."
        }
        
        cdl_interface CYGHWR_IO_FRAMEBUF_FUNCTIONALITY_WRITEABLE_PALETTE {
            display     "Framebuffer uses a writeable palette for colours"
            flavor      booldata
            description "
                This interface will be implemented if any of the framebuffer
                device drivers for the current platform use a palette, and this
                palette can be modified at run-time. In other words the contents
                of the framebuffer's memory do not represent colours directly,
                but instead are treated as indices into a separate table known
                as the palette."
        }
        
        cdl_interface CYGHWR_IO_FRAMEBUF_FUNCTIONALITY_VIEWPORT {
            display     "Framebuffer provides viewport support"
            flavor      booldata
            description "
              This interface will be implemented if any of the framebuffer
              device drivers for the current platform provide viewport support.
              In other words only a subset of the framebuffer, the viewport,
              is actually visible on the display and application code can move
              this viewport."
        }

        cdl_interface CYGHWR_IO_FRAMEBUF_FUNCTIONALITY_DOUBLE_BUFFER {
            display     "Framebuffer provides double buffering support"
            flavor      booldata
            description "
              This interface will be implemented if any of the framebuffer
              device drivers for the current platform provide support for
              double buffering. In other words the framebuffer memory that
              is updated by graphics operations is not what actually gets
              displayed. Instead there is a separate hidden area of memory
              used for the display, and when drawing is complete a flush
              operation is needed to move the framebuffer contents to that
              hidden area. This makes it possible to update the display more
              smoothly, at the cost of potentially expensive memory copy
              operations."
        }
    }

    cdl_option CYGFUN_IO_FRAMEBUF_INSTALL_DEFAULT_PALETTE {
        display         "Framebuffers should install a default palette"
        flavor          bool
        default_value   1
        active_if       CYGHWR_IO_FRAMEBUF_FUNCTIONALITY_WRITEABLE_PALETTE
        description "
          Framebuffer devices which involve a writeable palette may set this
          to a default palette when activated by cyg_fb_on() or equivalent
          functionality. This is useful when the application will access the
          framebuffer directly. It is less useful if a higher-level graphics
          library is in use because typically that will install its own
          palette, and typically there is a code/data overhead of approximately 1K."
    }
    
    cdl_component CYGPKG_IO_FRAMEBUF_OPTIONS {
        display "Framebuffer build options"
        flavor  none
        description   "
            Package specific build options including control over
            compiler flags used only in building the generic frame
            buffer package, and details of which tests are built."

        cdl_option CYGPKG_IO_FRAMEBUF_CFLAGS_ADD {
            display "Additional compiler flags"
            flavor  data
            no_define
            default_value { "" }
            description   "
                This option modifies the set of compiler flags for
                building the generic framebuffer package. These flags
                are used in addition to the set of global flags."
        }

        cdl_option CYGPKG_IO_FRAMEBUF_CFLAGS_REMOVE {
            display "Suppressed compiler flags"
            flavor  data
            no_define
            default_value { "" }
            description   "
                This option modifies the set of compiler flags for
                building the generic framebuffer package. These flags
                are removed from the set of global flags if present."
        }

        cdl_option CYGPKG_IO_FRAMEBUF_TESTS {
            display         "Framebuffer tests"
            active_if   CYGINT_IO_FRAMEBUF_DEVICES
            flavor          booldata
            calculated  { "tests/fb tests/fbmacro" }
            description "
                This option specifies the set of tests for the framebuffer package"
        }
    }
}