main.c File Reference

#include <kernel.h>
#include <libgs.h>

Include dependency graph for main.c:

Go to the source code of this file.

Data Structures
struct	MAVING_SPRITE

Macros
#define	MAX_SPRITES   1000
#define	SCREEN_WIDTH   640
#define	SCREEN_HEIGHT   448
#define	GIF_PACKET_MAX   10

Functions
static int	InitGraphics (void)
static int	InitSprites (void)
static int	MoveSprites (void)
static int	DrawSprites (GS_PACKET_TABLE *table)
int	main (int argc, char *argv[])

Variables
static const char	x_randspeeds [10] = {1,4,6,5,2,3,8,6,6,7}
static const GS_RGBAQ	randcolor [10]
static short int	ScreenOffsetX
static short int	ScreenOffsetY
static GS_DRAWENV	draw_env
static GS_DISPENV	disp_env
static GS_GIF_PACKET	packets [GIF_PACKET_MAX]
static GS_PACKET_TABLE	giftable
static MAVING_SPRITE	sprites [MAX_SPRITES]

Macro Definition Documentation

GIF_PACKET_MAX

#define GIF_PACKET_MAX   10

Definition at line 50 of file main.c.

MAX_SPRITES

#define MAX_SPRITES   1000

Definition at line 43 of file main.c.

SCREEN_HEIGHT

#define SCREEN_HEIGHT   448

Definition at line 46 of file main.c.

SCREEN_WIDTH

#define SCREEN_WIDTH   640

Definition at line 45 of file main.c.

Function Documentation

DrawSprites()

static int DrawSprites ( GS_PACKET_TABLE *  table )

static

Definition at line 213 of file main.c.

{
        int i;
        QWORD *p;
 
        for(i=0;i<MAX_SPRITES;i++)
        {
                //Use the uncached segment, to avoid needing to flush the data cache.
                p = (QWORD*)UNCACHED_SEG(GsGifPacketsAlloc(table, 5)); //Allocate 5 qword for 1 untextured strite
 
                /*      For this GIF packet, the EOP flag is set to 1.
                        Rightfully, it should only be set for only the final packet so that the GIF knows when it can safely switch paths,
                        but to keep things simple, it's set to 1 for every packet.
 
                        The packets are all in the PACKED format.       */
                gs_setGIF_TAG(((GS_GIF_TAG      *)&p[0]), 4,1,0,0,GS_GIF_PACKED,1,gif_rd_ad);
                gs_setR_PRIM(((GS_R_PRIM        *)&p[1]), GS_PRIM_SPRITE,0, 0, 0, 1, 0, 0, 0, 0);
                gs_setR_RGBAQ(((GS_R_RGBAQ      *)&p[2]), sprites[i].color.r, sprites[i].color.g, sprites[i].color.b, sprites[i].color.a, sprites[i].color.q);
                gs_setR_XYZ2(((GS_R_XYZ         *)&p[3]), (ScreenOffsetX+sprites[i].x_pos)<<4,  (ScreenOffsetY+sprites[i].y_pos)<<4, 0x00000000);
                gs_setR_XYZ2(((GS_R_XYZ         *)&p[4]), (ScreenOffsetX+sprites[i].x_pos+10)<<4,       (ScreenOffsetY+sprites[i].y_pos+10)<<4, 0x00000000);
        }
 
        return 0;
 
}

References GS_RGBAQ::a, GS_RGBAQ::b, MAVING_SPRITE::color, GS_RGBAQ::g, gif_rd_ad, GS_GIF_PACKED, GS_PRIM_SPRITE, gs_setGIF_TAG, gs_setR_PRIM, gs_setR_RGBAQ, gs_setR_XYZ2, GsGifPacketsAlloc(), MAX_SPRITES, GS_RGBAQ::q, ScreenOffsetX, ScreenOffsetY, sprites, and UNCACHED_SEG.

Referenced by main().

InitGraphics()

int InitGraphics ( void  )

static

Definition at line 88 of file main.c.

{
        unsigned int FrameBufferVRAMAddress;
 
        GsResetGraph(GS_INIT_RESET, GS_INTERLACED, GS_MODE_NTSC, GS_FFMD_FIELD);
 
        FrameBufferVRAMAddress=GsVramAllocFrameBuffer(SCREEN_WIDTH, SCREEN_HEIGHT, GS_PIXMODE_32);
        GsSetDefaultDrawEnv(&draw_env, GS_PIXMODE_32, SCREEN_WIDTH, SCREEN_HEIGHT);
        //Retrieve screen offset parameters.
        ScreenOffsetX=draw_env.offset_x;
        ScreenOffsetY=draw_env.offset_y;
        GsSetDefaultDrawEnvAddress(&draw_env, FrameBufferVRAMAddress);
 
        GsSetDefaultDisplayEnv(&disp_env, GS_PIXMODE_32, SCREEN_WIDTH, SCREEN_HEIGHT, 0, 0);
        GsSetDefaultDisplayEnvAddress(&disp_env, FrameBufferVRAMAddress);
 
        //execute draw/display environment(s)  (context 1)
        GsPutDrawEnv1(&draw_env);
        GsPutDisplayEnv1(&disp_env);
 
        //Set common primitive-drawing settings (Refer to documentation on PRMODE and PRMODECONT registers).
        GsOverridePrimAttributes(GS_DISABLE, 0, 0, 0, 0, 0, 0, 0, 0);
 
        //Set transparency settings for context 1 (Refer to documentation on TEST and TEXA registers).
        //Alpha test = enabled, pass if >= alpha reference, alpha reference = 1, fail method = no update
        GsEnableAlphaTransparency1(GS_ENABLE, GS_ALPHA_GEQUAL, 0x01, GS_ALPHA_NO_UPDATE);
        //Enable global alpha blending
        GsEnableAlphaBlending1(GS_ENABLE);
 
        //set transparency settings for context 2 (Refer to documentation on TEST and TEXA registers).
        //Alpha test = enabled, pass if >= alpha reference, alpha reference = 1, fail method = no update
        GsEnableAlphaTransparency2(GS_ENABLE, GS_ALPHA_GEQUAL, 0x01, GS_ALPHA_NO_UPDATE);
        //Enable global alpha blending
        GsEnableAlphaBlending2(GS_ENABLE);
 
        return 0;
}

References disp_env, draw_env, GS_ALPHA_GEQUAL, GS_ALPHA_NO_UPDATE, GS_DISABLE, GS_ENABLE, GS_FFMD_FIELD, GS_INIT_RESET, GS_INTERLACED, GS_MODE_NTSC, GS_PIXMODE_32, GsEnableAlphaBlending1(), GsEnableAlphaBlending2(), GsEnableAlphaTransparency1(), GsEnableAlphaTransparency2(), GsOverridePrimAttributes(), GsPutDisplayEnv1(), GsPutDrawEnv1(), GsResetGraph(), GsSetDefaultDisplayEnv(), GsSetDefaultDisplayEnvAddress(), GsSetDefaultDrawEnv(), GsSetDefaultDrawEnvAddress(), GsVramAllocFrameBuffer(), GS_DRAWENV::offset_x, GS_DRAWENV::offset_y, SCREEN_HEIGHT, SCREEN_WIDTH, ScreenOffsetX, and ScreenOffsetY.

Referenced by main().

InitSprites()

static int InitSprites ( void  )

static

Definition at line 128 of file main.c.

{
        int i,j;
 
        for(i=0,j=0;i<MAX_SPRITES;i++,j++)
        {
                if(j>9)j=0;
 
                sprites[i].x_pos        =i;
                sprites[i].y_pos        =i/2;
 
                sprites[i].x_dir        =0;
                sprites[i].y_dir        =0;
 
                sprites[i].x_speed      =i/x_randspeeds[j];
                sprites[i].y_speed      =x_randspeeds[j]+1;
 
                if(sprites[i].x_speed<=0)sprites[i].x_speed=2;
                if(sprites[i].y_speed<=0)sprites[i].y_speed=1;
 
 
                //set color
                sprites[i].color = randcolor[j];
        }
 
        return 0;
}

References MAVING_SPRITE::color, MAX_SPRITES, randcolor, sprites, MAVING_SPRITE::x_dir, MAVING_SPRITE::x_pos, x_randspeeds, MAVING_SPRITE::x_speed, MAVING_SPRITE::y_dir, MAVING_SPRITE::y_pos, and MAVING_SPRITE::y_speed.

Referenced by main().

main()

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 63 of file main.c.

{
        InitGraphics();
 
        giftable.packet_count   = GIF_PACKET_MAX;
        giftable.packets        = packets;
 
        InitSprites();
 
        while(1)
        {
                GsGifPacketsClear(&giftable);           // clear the area that we are going to put the sprites/triangles/....
 
                MoveSprites();
                DrawSprites(&giftable);                 //add stuff to the packet area
 
                GsDrawSync(0);
                GsVSync(0);
                GsClearDrawEnv1(&draw_env);             // clear the draw environment before we draw stuff on it
                GsGifPacketsExecute(&giftable, 1);      // set to '1' becuse we want to wait for drawing to finish. if we dont wait we will write on packets that is currently writing to the gif
        }
 
        return 0;
}

References draw_env, DrawSprites(), GIF_PACKET_MAX, giftable, GsClearDrawEnv1(), GsDrawSync(), GsGifPacketsClear(), GsGifPacketsExecute(), GsVSync(), InitGraphics(), InitSprites(), MoveSprites(), GS_PACKET_TABLE::packet_count, GS_PACKET_TABLE::packets, and packets.

MoveSprites()

static int MoveSprites ( void  )

static

Definition at line 156 of file main.c.

{
        int i;
 
        for(i=0;i<MAX_SPRITES;i++)
        {
                // mod a little
        //      sprites[i].x_speed++;
        //      sprites[i].y_speed++;
 
                if(sprites[i].x_speed>10)sprites[i].x_speed             =sprites[i].x_speed-10;
                if(sprites[i].y_speed>10)sprites[i].y_speed             =sprites[i].y_speed-10;
 
                //x
                if(sprites[i].x_dir==0)
                {
                        sprites[i].x_pos        -= sprites[i].x_speed;
                        if(sprites[i].x_pos<0)
                        {
                                sprites[i].x_pos=0;
                                sprites[i].x_dir=1;
                        }
                }
                else if(sprites[i].x_dir==1)
                {
                        sprites[i].x_pos        += sprites[i].x_speed;
                        if(sprites[i].x_pos>SCREEN_WIDTH)
                        {
                                sprites[i].x_pos = SCREEN_WIDTH;
                                sprites[i].x_dir=0;
                        }
                }
 
                //y
                if(sprites[i].y_dir==0)
                {
                        sprites[i].y_pos        -= sprites[i].y_speed;
                        if(sprites[i].y_pos<0)
                        {
                                sprites[i].y_pos=0;
                                sprites[i].y_dir=1;
                        }
                }
                else if(sprites[i].y_dir==1)
                {
                        sprites[i].y_pos        += sprites[i].y_speed;
                        if(sprites[i].y_pos>SCREEN_HEIGHT)
                        {
                                sprites[i].y_pos=SCREEN_HEIGHT;
                                sprites[i].y_dir=0;
                        }
                }
        }
 
        return 0;
}

References MAX_SPRITES, SCREEN_HEIGHT, SCREEN_WIDTH, sprites, MAVING_SPRITE::x_dir, MAVING_SPRITE::x_pos, MAVING_SPRITE::x_speed, MAVING_SPRITE::y_dir, MAVING_SPRITE::y_pos, and MAVING_SPRITE::y_speed.

Referenced by main().

Variable Documentation

disp_env

GS_DISPENV disp_env

static

Definition at line 53 of file main.c.

Referenced by InitGraphics().

draw_env

GS_DRAWENV draw_env

static

Definition at line 52 of file main.c.

Referenced by InitGraphics(), and main().

giftable

GS_PACKET_TABLE giftable

static

Definition at line 56 of file main.c.

Referenced by main().

packets

GS_GIF_PACKET packets[GIF_PACKET_MAX]

static

Definition at line 55 of file main.c.

Referenced by main().

randcolor

const GS_RGBAQ randcolor[10]

static

Initial value:

={      {28 ,200,200,0x80,0.0f},
                                        {255,  0,128,0x80,0.0f},
                                        {255,128,0,0x80,0.0f},
                                        {255,255,255,0x80,0.0f},
                                        {0  ,128,255,0x80,0.0f},
                                        {255,255,128,0x80,0.0f},
                                        {128,128,255,0x80,0.0f},
                                        {226,137,245,0x80,0.0f},
                                        {172,177,210,0x80,0.0f},
                                        {221,180,162,0x80,0.0f}
                                }

Definition at line 30 of file main.c.

Referenced by InitSprites().

ScreenOffsetX

short int ScreenOffsetX

static

Definition at line 48 of file main.c.

Referenced by DrawSprites(), and InitGraphics().

ScreenOffsetY

short int ScreenOffsetY

static

Definition at line 48 of file main.c.

Referenced by DrawSprites(), and InitGraphics().

sprites

MAVING_SPRITE sprites[MAX_SPRITES]

static

Definition at line 126 of file main.c.

Referenced by DrawSprites(), InitSprites(), and MoveSprites().

x_randspeeds

const char x_randspeeds[10] = {1,4,6,5,2,3,8,6,6,7}

static

Definition at line 28 of file main.c.

Referenced by InitSprites().