wexbasic.c

vxworks下windml的一些demo程序

/* wexbasic.c - WindML Basic Graphics Primitive example program */

/* Copyright 2000 Wind River Systems, Inc. All Rights Reserved */

/*
modification history
--------------------
01k,22feb02,msr  Backward compatability for input API.
01j,29jan02,rbp  Addition of support for Native Unix.
01i,05nov01,gav  Fixed misnamed devIds
01h,05nov01,gav  Change to new registry
01g,05nov01,gav  Change to new registry
01f,09oct01,msr  Ported to new UGL_Q_EVENT architecture.
01e,19dec00,gav  Entry point identical to filename w/o extension.
01d,20nov00,gav  Relative object positioning.
01c,27oct00,rfm  Added stdio usage
01b,26oct00,rfm  Modified entry point
01a,25oct00,rfm  Added modification history
*/

/**************************************************************
*  WindML Example - Basic Graphics Primitives
*
* This example program demonstrates how to draw basic primitives
* to the screen.
*
* To start the example:
*
* -> ld < wexbasic_ugl.o
* -> wexbasic
*
* To stop the example:
*
* -> wexbasicStop
*
**************************************************************/

/* This is included for a printf prototype. */

#include <stdio.h>

/* Include the UGL header file to use UGL functions, etc. */

#include <ugl/ugl.h>
#include <ugl/uglos.h>
#include <ugl/uglinput.h>

/* A forward declaration for this program. */

UGL_LOCAL int windMLExampleBasic (void);

/* Global variables */

/* Control variable to signal when to stop program */

UGL_LOCAL volatile UGL_BOOL stopWex;

/* Some graphics environment information */

UGL_LOCAL int displayHeight, displayWidth;

/* input service */

UGL_LOCAL UGL_INPUT_SERVICE_ID inputServiceId;

/*
* The color table is where we define the colors we want
* to have available.  The format is an array of
* ARGB values paired with their allocated uglColor.  As
* of this writing, we don't need to worry about Alpha
* ("A") values unless we are using video.
*/

UGL_LOCAL struct _colorStruct
    {
    UGL_ARGB rgbColor;
    UGL_COLOR uglColor;
    }
colorTable[] =
    {
    { UGL_MAKE_ARGB(0xff, 0, 0, 0), 0},    /* The color table uses ARGB's */
    { UGL_MAKE_ARGB(0xff, 0, 0, 168), 0},  /* (see uglColorAlloc).        */
    { UGL_MAKE_ARGB(0xff, 0, 168, 0), 0},  /* Initialize alpha to 255 for */
    { UGL_MAKE_ARGB(0xff, 0, 168, 168), 0},/* now (opaque).               */

    { UGL_MAKE_RGB(168, 0, 0), 0},         /* UGL_MAKE_RGB takes care of  */
    { UGL_MAKE_RGB(168, 0, 168), 0},       /* the alpha for us.           */
    { UGL_MAKE_RGB(168, 84, 0), 0},
    { UGL_MAKE_RGB(168, 168, 168), 0},

    { UGL_MAKE_RGB(84, 84, 84), 0},
    { UGL_MAKE_RGB(84, 84, 255), 0},
    { UGL_MAKE_RGB(84, 255, 84), 0},
    { UGL_MAKE_RGB(84, 255, 255), 0},

    { UGL_MAKE_RGB(255, 84, 84), 0},
    { UGL_MAKE_RGB(255, 84, 255), 0},
    { UGL_MAKE_RGB(255, 255, 84), 0},
    { UGL_MAKE_RGB(255, 255, 255), 0}
    };

/* Label the colors we defined */

#define BLACK			(0)
#define BLUE			(1)
#define GREEN			(2)
#define CYAN			(3)
#define RED			    (4)
#define MAGENTA			(5)
#define BROWN			(6)
#define LIGHTGRAY		(7)
#define DARKGRAY		(8)
#define LIGHTBLUE		(9)
#define LIGHTGREEN		(10)
#define LIGHTCYAN		(11)
#define LIGHTRED		(12)
#define LIGHTMAGENTA	(13)
#define YELLOW			(14)
#define WHITE			(15)

/* 
* This is the data for a user defined fill pattern that
* can be used with various drawing primitives.  This data
* will be used to create a monochrome DIB (MDIB), which
* will be used in turn to create a monochrome "bitmap".
* It is the bitmap that is used by the drawing primitives.
*
* Solid fills do not need to have a pattern defined, just
* pass an UGL_NULL value in the pattern parameter to
* revert (it is the default) to solid fills.
*/

UGL_LOCAL struct
    {
    int width;
    int height;
    unsigned char data[32];
    } patternData =
    {
    16, 16,
        { 
        0xFF, 0xFF, /* a brick pattern */
        0x00, 0x01,
        0x00, 0x01, /* 8 pixels per byte */
        0x00, 0x01,
        0x00, 0x01,
        0x00, 0x01,
        0x00, 0x01,
        0x00, 0x01,
        0xFF, 0xFF, 
        0x01, 0x00,
        0x01, 0x00,
        0x01, 0x00,
        0x01, 0x00,
        0x01, 0x00,
        0x01, 0x00,
        0x01, 0x00
        }
    };

/* Use this to make sure the frame buffer is clear */

UGL_LOCAL void ClearScreen(UGL_GC_ID gc)
    {
    uglBackgroundColorSet(gc, colorTable [BLACK].uglColor);
    uglForegroundColorSet(gc, colorTable [BLACK].uglColor);
    uglLineStyleSet(gc, UGL_LINE_STYLE_SOLID);
    uglLineWidthSet(gc, 1);
    uglRectangle(gc, 0, 0, displayWidth - 1, displayHeight - 1);
    }

/*
* Wait for the signal to stop.  This is the last function
* called before freeing resources and de-initializing UGL.
*/

UGL_LOCAL void wexPause(void)
    {
    while (!stopWex)
        {
        UGL_MSG msg;
        if ((uglInputMsgGet (inputServiceId, &msg, 140) != UGL_STATUS_Q_EMPTY) &&
            msg.type == MSG_KEYBOARD)
            stopWex = UGL_TRUE;
        }
    }

/*
* Start the example program.  This function and the basicStop function
* can be invoked from the host shell in order to control the program.
*/

#if defined(WINDML_NATIVE) && defined(__unix__)
int main (int argc, char *argv [])
    {
    windMLExampleBasic();
    return (0);
    }
#elif defined(WINDML_NATIVE) && defined(_WIN32)
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nShowCmd)
    {
    uglWin32Parameters(hInstance, hPrevInstance, lpCmdLine, nShowCmd);
    windMLExampleBasic();
    return (0);
    }
#else
void wexbasic (void)
    {
    stopWex = UGL_FALSE;
    printf("To stop wexbasic, type 'wexbasicStop'\n");
    uglOSTaskCreate("tWindMLbas", (UGL_FPTR)windMLExampleBasic, 110, 
		    0, 10240,0,0,0,0,0);
    }
#endif

/* Stop the example program; by signalling the wexPause function. */

void wexbasicStop (void)
    {
    stopWex = UGL_TRUE;
    }


/* The main function */

UGL_LOCAL int windMLExampleBasic (void)
    {

    /* An int for miscellaneous counters,etc. */

    int i;

    /* 
    * The UGL Graphics Context (GC) is an important concept in UGL.
    * The GC contains data that various UGL functions can use.
    * If there were no such thing as a GC, most function calls
    * would require several more parameters to communicate that
    * information.
    */

    UGL_GC_ID gc;

    /* 
    * This structure is filled in with data about the frame buffer
    * by the uglInfo() function.
    */
    
    UGL_MODE_INFO modeInfo;
    
    /*
    * The device ID is critical to the operation of UGL.  It
    * identifies individual "devices" (display adapter, keyboard,
    * font engine, etc.) to functions that may be able to work
    * with more than one device.
    */

    UGL_DEVICE_ID devId;

    /*
    * As mentioned in the comments to patternData, the fill pattern
    * is defined as a monochrome bitmap for certain drawing primitives.
    * To create the bitmap (UGL_MDDB_ID), a Device Independent Bitmap
    * (DIB) is used; in particular a monochrome DIB (UGL_MDIB).  The
    * "DDB" in UGL_MDDB_ID stands for Device Dependent Bitmap.  Often
    * the DDB is simply referred to as a "bitmap" and the DIB is
    * called a "dib" (it's easier to pronounce dib than ddb).
    */

    UGL_MDIB patternDib;
    UGL_MDDB_ID patternBitmap;

    /*
    * Initialize UGL.  Must do this before trying to do anything
    * else within UGL/WindML.
    */

    uglInitialize();

    /* Obtain the device identifier for the display */

    devId = (UGL_DEVICE_ID)uglRegistryFind (UGL_DISPLAY_TYPE,  0, 0,0)->id;
    inputServiceId = (UGL_INPUT_SERVICE_ID)uglRegistryFind (UGL_INPUT_SERVICE_TYPE,  0, 0,0)->id;

    /*
    * Obtain the dimensions of the display.  We will use these
    * to center some of our objects.
    */

    uglInfo(devId, UGL_MODE_INFO_REQ, &modeInfo);
    displayWidth = modeInfo.width;
    displayHeight = modeInfo.height;

    /*
    * Create a graphics context.  Default values are set during
    * the creation.
    */

    gc = uglGcCreate(devId);

    /* 
    * Initialize colors. UGL maintains a Color Look-Up Table (CLUT)
    * for devices that do not represent colors directly.  Essentially
    * some hardware is only able to represent a subset of colors at
    * any given time.  To manage which colors will be available for
    * rendering, UGL uses color allocation.  If the hardware is able
    * to represent colors directly, then the uglColorAlloc() function
    * still works, but it is then essentially a no-op.
    *
    * We have set up for 16 colors, so here we will "allocate" them
    * within UGL's CLUT (sometimes referred to as a "palette").  Colors
    * can also be de-allocated, or freed, with uglColorFree.
    *
    * Since the ARGB's are intermingled with the UGL_COLORs in
    * the colorTable, we must allocate each color individually.
    * If the ARGB's had a contiguous array of ARGBs, and likewise for
    * the UGL_COLORs, a single uglColorAlloc call could be made.
    * (see the windows example).