PSP alphatest test

alphatest.c

#include <pspdisplay.h>
#include <pspgu.h>
#include <pspgum.h>
#include <common.h>
#include <pspkernel.h>
#include "commands.h"

#define BUF_WIDTH 512
#define SCR_WIDTH 480
#define SCR_HEIGHT 272

typedef u32 color_t;
typedef color_t __attribute__((aligned(16))) colorline_t[16];
typedef colorline_t __attribute__((aligned(16))) colorsquare_t[16];

unsigned int __attribute__((aligned(16))) list[262144];
unsigned int __attribute__((aligned(16))) clut[] = { 0xaaaaaaaa, 0x33ffffff, 0x00000000 };
unsigned char __attribute__((aligned(16))) bgData[] = {
	2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
unsigned char __attribute__((aligned(16))) imageData[] = {
	0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};

colorsquare_t boxImages[] = {
	{
		{0x80808080, 0x80808080, 0x80808080, 0x80808080},
		{0x80808080, 0x80808080, 0x80808080, 0x80808080},
		{0x80808080, 0x80808080, 0x80808080, 0x80808080},
		{0x80808080, 0x80808080, 0x80808080, 0x80808080},
	},
	{
		{0x80808080, 0x30808080, 0x80808080, 0x80808080},
		{0x30808080, 0x80808080, 0x80808080, 0x80808080},
		{0x80808080, 0x30808080, 0x80808080, 0x80808080},
		{0x30808080, 0x80808080, 0x80808080, 0x80808080},
	},
};

typedef struct __attribute__((aligned(16)))
{
	unsigned short a, b;
	unsigned long color;
	unsigned short x, y, z;
} VertexColor;

VertexColor bg[2] = { {0, 0, 0x33333333, 0, 0, 0}, {4, 4, 0x33333333, 479, 272, 0} };
VertexColor colorVertices[2 * 100];
int boxNum = 0;

void nextBox(int *x, int *y, u32 c)
{
	colorsquare_t *boxImage = &boxImages[boxNum];
	VertexColor *vtx = &colorVertices[boxNum * 2];
	boxNum++;

	vtx[0].a = 0;
	vtx[0].b = 0;
	vtx[0].color = c;
	vtx[0].x = *x;
	vtx[0].y = *y;
	vtx[0].a = 4;
	vtx[0].b = 4;
	vtx[1].color = c;
	vtx[1].x = *x + 40;
	vtx[1].y = *y + 20;

	*x += 47;
	if (*x >= 470) {
		*x = 10;
		*y += 26;
	}
	sceKernelDcacheWritebackRange(vtx, sizeof(VertexColor) * 2);

	sceGuBlendFunc(GU_ADD, GU_SRC_ALPHA, GU_ONE_MINUS_SRC_ALPHA, 0, 0);
	sceGuEnable(GU_TEXTURE_2D);
	sceGuTexMode(GU_PSM_8888, 0, 0, GU_FALSE);
	sceGuTexFunc(GU_TFX_REPLACE, GU_TCC_RGBA);
	sceGuTexImage(0, 4, 4, 16, boxImage);

	sceGuDrawArray(GU_SPRITES, GU_COLOR_8888 | GU_TEXTURE_16BIT | GU_VERTEX_16BIT | GU_TRANSFORM_2D, 2, NULL, vtx);
}

void drawBG()
{
	sceGuEnable(GU_TEXTURE_2D);
	sceGuTexMode(GU_PSM_T8, 0, 0, GU_FALSE);
	sceGuTexFunc(GU_TFX_DECAL, GU_TCC_RGBA);
	sceGuTexImage(0, 4, 4, 16, bgData);

	sceGuDrawArray(GU_SPRITES, GU_COLOR_8888 | GU_TEXTURE_16BIT | GU_VERTEX_16BIT | GU_TRANSFORM_2D, 2, NULL, bg);
}

void draw()
{
	int x = 10, y = 10;

	sceDisplaySetMode(0, SCR_WIDTH, SCR_HEIGHT);
	sceGuStart(GU_DIRECT, list);
	sceGuClear(GU_COLOR_BUFFER_BIT | GU_STENCIL_BUFFER_BIT);

	sceGuClutMode(GU_PSM_8888, 0, 0xFF, 0);
	sceGuClutLoad(1, clut);
	
	drawBG();
	boxNum = 0;

	// Reset things.
	sceGuSendCommandi(GE_CMD_ALPHATESTENABLE, 0);
	sceGuSendCommandi(GE_CMD_ALPHATEST, 0);

	//nextBox(&x, &y, 0x80FFFFFF);
	//nextBox(&x, &y, 0x80FF0000);
	//nextBox(&x, &y, 0xFFFF0000);

	nextBox(&x, &y, 0xFF000000);
	nextBox(&x, &y, 0x00FF0000);
	nextBox(&x, &y, 0x0000FF00);
	nextBox(&x, &y, 0x000000FF);

	nextBox(&x, &y, 0x80000000);
	nextBox(&x, &y, 0x00800000);
	nextBox(&x, &y, 0x00008000);
	nextBox(&x, &y, 0x00000080);

	sceGuFinish();
	sceGuSync(GU_SYNC_LIST, GU_SYNC_WHAT_DONE);
	sceGuSync(0, 0);

	sceDisplayWaitVblankStart();
}

void init()
{
	void *fbp0 = 0;
 
	sceGuInit();
	sceGuStart(GU_DIRECT, list);
	sceGuDrawBuffer(GU_PSM_8888, fbp0, BUF_WIDTH);
	sceGuDispBuffer(SCR_WIDTH, SCR_HEIGHT, fbp0, BUF_WIDTH);
	sceGuScissor(0, 0, SCR_WIDTH, SCR_HEIGHT);
	sceGuEnable(GU_SCISSOR_TEST);
	sceGuFinish();
	sceGuSync(0, 0);
 
	sceDisplayWaitVblankStart();
	sceGuDisplay(1);
}

int main(int argc, char *argv[])
{
	int i;
	init();
	for (i = 0; i < 120; ++i) {
		draw();
	}

	emulatorEmitScreenshot();

	sceGuTerm();

	return 0;
}