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/*! \file display.hcc
*
* \section generic Message build up information and more
*
* \section project Project information.
* Project Graphic Equalizer\n
* \author O.M. Schinagl
* \date 20041011
* \version 0.1
*
* \section copyright Copyright
* Copyright ©2004 Koninklijke Philips Electronics N.V. All rights reserved
*
* \section history Change history
* 20041011: O.M. Schinagl\n Initial version
*
********************************************************************/
/******** System Includes *************/
#include <stdlib.hch>
#include "pal_master.hch"
/******** Application Includes ********/
#include "display.hch"
/*! \fn void display_main(RAM_BANK0, RAM_BANK1);
* \brief This routine handles all drawing of pixels. It never returns!
*
* \param PL2RAM RAM_BANK0 Handle to the first rambank.
* \param PL2RAM RAM_BANK1 Handle to the second rambank.
*
* \return Never Returns.
* \retval void
*/
macro void display_main(RAM_BANK0, RAM_BANK1) {
/*
* Setup macro's to coordinate pixel writing.
*/
macro expr VideoOut = PalVideoOutOptimalCT(ClockRate);
macro expr VisibleX = PalVideoOutGetVisibleX (VideoOut, ClockRate);
macro expr TotalX = PalVideoOutGetTotalX (VideoOut, ClockRate);
macro expr TotalY = PalVideoOutGetTotalY (VideoOut);
macro expr X = PalVideoOutGetX (VideoOut);
macro expr Y = PalVideoOutGetY (VideoOut);
unsigned 32 pixeldata;
unsigned AW nextaddr;
unsigned DW pixeldata;
unsigned 1 SwitchData, help;
/*
* Prime Rendering Pipeline to start at bank 0 address 0.
*/
PalPL2RAMSetReadAddress(RAM_BANK0, 0);
/*
* Run the following tasks indefinatly and in parallel
*/
par (;;) {
/*
* We write only the last 24 bits of pixeldata as it also
* contains information about the mask.
*/
PalVideoOutWrite(VideoOut, pixeldata <- 24);
/* FIXME this needs to be replaced by a global state array */
PalSwitchRead(PalSwitchCT(0), &help);
/*
* When 'help' is activated, we display data from rambank 1
* otherwise we draw from rambank 0.
*/
if (help) {
PalPL2RAMRead(RAM_BANK1, &Data);
PalPL2RAMSetReadAddress(RAM_BANK1, nextaddr);
} else {
PalPL2RAMRead(PL2RAM_BANK0, &Data);
PalPL2RAMSetReadAddress(RAM_BANK0, nextaddr);
}
/*
* The current position of the screen can lay in an area called
* the blanking area. We don't have data for this area as it is
* not drawn. We therefor have to determin wether we are beyond
* the visible area of the screen, but before the end of the
* total width of the screen.
* Our pipeline consists of 5 total stages. Therefor we have to
* substract 5 pixels.
*/
if ((X > (VisibleX - 5)) && (X <= (TotalX - 5))) {
/*
* We are in the blanking area of the screen. If we are
* on the last line, and thus last pixel we reset our
* address counter.
*/
if (Y == (TotalY -1)) {
nextaddr = 0;
}
} else {
/*
* Increase the memory counter for each pixel drawn
* thus keeping the memory location in sync with
* the current pixel position.
*/
nextaddr++;
}
} /* --- display_main() --- */
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