#include <pspkernel.h>
#include <pspdisplay.h>
#include <pspctrl.h>
#include <pspgu.h>
#include <pspgum.h>

PSP_MODULE_INFO("Graphic", 0, 1, 0);
static unsigned int __attribute__((aligned(16))) list[262144]; // Für was stehen die 262144?
#define RGB(r, g, b) ((r)|((g)<<8)|((b)<<16)) // Make Colors easier
#define RGBA(r, g, b,a) ((r)|((g)<<8)|((b)<<16)|((a)<<24)) // // Make Colors + alphachannel easier

struct Vertex {
	float u, v;
	unsigned int color;
	float x,y,z;
};

/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
          sceKernelExitGame();
          return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
          int cbid;

          cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
          sceKernelRegisterExitCallback(cbid);

          sceKernelSleepThreadCB();

          return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
          int thid = 0;

          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }

          return thid;
}


/* RESULTAT: *freu* ich konnte oben links inner Ecke nen Pixel rot färben, toll...
   Normalerweise sollte das ganze Teil dank/durch sceGuClearColor(RGBA(255,0,0,255)); Rot sein.
*/


int initGU() {
	SetupCallbacks();
	sceGuInit();
	sceGuStart(GU_DIRECT, list); // Create new displaylist
	// zonk nach bedeutung der void pointer fragen, was ist der VRAM, warum setzen ein paar samples vom SDK den pointer anders? (haben ne vram.h included)
	sceGuDrawBuffer(GU_PSM_8888,(void*)0,512); // Create backbuffer with 24bit color, 512bit buffer width
	sceGuDispBuffer(480,272,(void*)0x88000,512); // Create displaybuffer @ 480x272, 512bit buffer width
	sceGuDepthBuffer((void*)0x110000,512); // Create depthbuffer @ 0x110000, 512bit buffer width  <-- zonk nach bedeutung fragen
	sceGuOffset(2048-(480/2),2048-(480/2));  // Center the screen
	sceGuViewport(2048,2048,480,272); // Set viewport to 2048,2048 @ 480x272px
	sceGuDepthRange(65535,0); // Set depthrange <-- zonk nach bedeutung fragen

//	sceGuScissor(0,0,480,272);  // Set the clipping area
//	sceGuEnable(GU_CLIPPING_PLANES); // Enable clipping

	sceGuEnable(GU_DEPTH_TEST);
	sceGuShadeModel(GU_SMOOTH); // Smooth shaden <-- vielleicht auch nochmal erklärn :)
	sceGuTexFilter(GU_NEAREST, GU_NEAREST);
	sceGuFinish(); // Finish displaylist
	sceGuSync(0,0); // Synch displaylist

	sceDisplayWaitVblankStart(); // Wait 1 frame
	sceGuDisplay(GU_TRUE);  // Enable display
	return 0;
}

int main() {
	SceCtrlData pad;
	initGU();
	while(1) {
		sceCtrlReadBufferPositive(&pad,1);

		sceGuStart(GU_DIRECT,list); // Open displaylist
		sceGuClearColor(RGBA(255,0,0,255)); // Set clear color
		sceGuClearDepth(0); // Clear Depthbuffer ??
		sceGuClear(GU_COLOR_BUFFER_BIT|GU_DEPTH_BUFFER_BIT);  // Clear Drawbuffer, Depth Buffer Bit??

		                           // PROJECTION MATRIX
/*---------------------------------------------------------------------------*/
		sceGumMatrixMode(GU_PROJECTION);
		sceGumLoadIdentity();
		sceGumPerspective(75.0f,16.0f/9.0f,0.5f,1000.0f);

		                           // VIEWPORT
/*---------------------------------------------------------------------------*/
		sceGumMatrixMode(GU_VIEW); 
		sceGumLoadIdentity();
                                    
		                           // MODELVIEW
/*---------------------------------------------------------------------------*/
		sceGumMatrixMode(GU_MODEL); 
		sceGumLoadIdentity();
		sceGuAmbientColor(0xffffffff);

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


		sceGuFinish();  // Finish displaylist
		sceGuSync(0,0); // Synch displaylist

		sceDisplayWaitVblankStart(); // Wait 1 frame;
		sceGuSwapBuffers();  // Switch Front and Backbuffer
	}
	sceGuDisplay(GU_FALSE); // Disable display
	sceGuTerm(); // Terminate the GU
	return 0;
}