gistfile1.txt

/*---------------------------------------------------------------------------------

	nehe lesson 2 port to GX by WinterMute

---------------------------------------------------------------------------------*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <math.h>
#include <gccore.h>

 
#define DEFAULT_FIFO_SIZE	(256*1024)
 
static void *frameBuffer[2] = { NULL, NULL};
GXRModeObj *rmode;

//---------------------------------------------------------------------------------
int main( int argc, char **argv ){
//---------------------------------------------------------------------------------
	f32 yscale;

	u32 xfbHeight;
	Mtx44 proj;

	u32	fb = 0; 	// initial framebuffer index
	u32 i;
	GXColor background = {0x11, 0x22, 0x33, 0xff};

	// init the vi.
	VIDEO_Init();
 
	rmode = VIDEO_GetPreferredMode(NULL);
	PAD_Init();
	
	// allocate 2 framebuffers for double buffering
	frameBuffer[0] = MEM_K0_TO_K1(SYS_AllocateFramebuffer(rmode));
	frameBuffer[1] = MEM_K0_TO_K1(SYS_AllocateFramebuffer(rmode));

	VIDEO_Configure(rmode);
	VIDEO_SetNextFramebuffer(frameBuffer[fb]);
	VIDEO_SetBlack(FALSE);
	VIDEO_Flush();
	VIDEO_WaitVSync();
	if(rmode->viTVMode&VI_NON_INTERLACE) VIDEO_WaitVSync();

	// setup the fifo and then init the flipper
	void *gp_fifo = NULL;
	gp_fifo = memalign(32,DEFAULT_FIFO_SIZE);
	memset(gp_fifo,0,DEFAULT_FIFO_SIZE);
 
	GX_Init(gp_fifo,DEFAULT_FIFO_SIZE);
 
	// clears the bg to color and clears the z buffer
	GX_SetCopyClear(background, 0x00ffffff);
 
	// other gx setup
	GX_SetViewport(0,0,rmode->fbWidth,rmode->efbHeight,0,1);
	yscale = GX_GetYScaleFactor(rmode->efbHeight,rmode->xfbHeight);
	xfbHeight = GX_SetDispCopyYScale(yscale);
	GX_SetScissor(0,0,rmode->fbWidth,rmode->efbHeight);
	GX_SetDispCopySrc(0,0,rmode->fbWidth,rmode->efbHeight);
	GX_SetDispCopyDst(rmode->fbWidth,xfbHeight);
	GX_SetCopyFilter(rmode->aa,rmode->sample_pattern,GX_TRUE,rmode->vfilter);
	GX_SetFieldMode(rmode->field_rendering,((rmode->viHeight==2*rmode->xfbHeight)?GX_ENABLE:GX_DISABLE));
 
	GX_SetCullMode(GX_CULL_NONE);
	GX_CopyDisp(frameBuffer[fb],GX_TRUE);
	GX_SetDispCopyGamma(GX_GM_1_0);
 
	// setup the vertex descriptor
	// tells the flipper to expect direct data
	GX_ClearVtxDesc();
	GX_SetVtxDesc(GX_VA_POS, GX_DIRECT);
 
	// setup the vertex attribute table
	// describes the data
	// args: vat location 0-7, type of data, data format, size, scale
	// so for ex. in the first call we are sending position data with
	// 3 values X,Y,Z of size F32. scale sets the number of fractional
	// bits for non float data.
	GX_SetVtxAttrFmt(GX_VTXFMT0, GX_VA_POS, GX_POS_XYZ, GX_F32, 0);
 
	GX_SetNumChans(1);
	GX_SetNumTexGens(0);
	GX_SetTevOrder(GX_TEVSTAGE0, GX_TEXCOORDNULL, GX_TEXMAP_NULL, GX_COLOR0A0);
	GX_SetTevOp(GX_TEVSTAGE0, GX_PASSCLR);
 
	// setup our projection matrix
	// this creates a perspective matrix with a view angle of 90,
	// and aspect ratio based on the display resolution
    f32 w = rmode->viWidth;
    f32 h = rmode->viHeight;
	
	(void)w; (void)h;
	
	//guPerspective(proj, 45, (f32)w/h, 0.1F, 300.0F);
	
	guMtxIdentity(proj);
	//GX_LoadProjectionMtx(proj, GX_PERSPECTIVE);
	GX_LoadProjectionMtx(proj, GX_ORTHOGRAPHIC);
 
	while(1) {

		PAD_ScanPads();

		if ( PAD_ButtonsDown(0) & PAD_BUTTON_START) {
			exit(0);
		}

		// do this before drawing
		GX_SetViewport(0,0,rmode->fbWidth,rmode->efbHeight,0,1);

		Mtx model;
		guMtxTrans(model, 0.0f, 0.0f, -2.0f);
		guMtxScaleApply(model, model, 0.125f, 0.125f, 1.0f);
		guMtxTransApply(model, model, -0.5, 0.0f, 0.0f);
		for (i=0; i<5; ++i)
		{
			GX_LoadPosMtxImm(model, GX_PNMTX0);
			GX_Begin(GX_TRIANGLES, GX_VTXFMT0, 3);
				GX_Position3f32( 0.0f,  1.0f, 0.0f);
				GX_Position3f32(-1.0f, -1.0f, 0.0f);
				GX_Position3f32( 1.0f, -1.0f, 0.0f);
			GX_End();
			guMtxTransApply(model, model, 0.25f, 0.0f, 1.0f);
		}
		
		guMtxIdentity(model);
		GX_LoadPosMtxImm(model, GX_PNMTX0);
		GX_Begin(GX_QUADS, GX_VTXFMT0, 4);
			GX_Position3f32(-1.0f, 1.0f, -2.0f);
			GX_Position3f32( 1.0f, 1.0f, 2.0f);
			GX_Position3f32( 1.0f, 0.5f, 2.0f);
			GX_Position3f32(-1.0f, 0.5f, -2.0f);
		GX_End();

		// do this stuff after drawing
		GX_DrawDone();
		
		fb ^= 1;		// flip framebuffer
		GX_SetZMode(GX_TRUE, GX_LEQUAL, GX_TRUE);
		GX_SetColorUpdate(GX_TRUE);
		GX_CopyDisp(frameBuffer[fb],GX_TRUE);

		VIDEO_SetNextFramebuffer(frameBuffer[fb]);
 
		VIDEO_Flush();
 
		VIDEO_WaitVSync();


	}
	return 0;
}