Add depth test to gxtest.

gxtest/CMakeLists.txt

@@ -7,3 +7,4 @@ add_hwtest(gxtest clipping      clipping.cpp)
 add_hwtest(gxtest lighting      lighting.cpp)
 add_hwtest(gxtest rasterization rasterization.cpp)
 add_hwtest(gxtest tev           tev.cpp)
+add_hwtest(gxtest depth         depth.cpp)

gxtest/depth.cpp

@@ -0,0 +1,176 @@
+// adapted from	the	original acube demo	by tkcne.
+
+// enjoy
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <malloc.h>
+#include <math.h>
+#include <gccore.h>
+#include <wiiuse/wpad.h>
+
+#define HW_PEEK 13884592
+
+GXRModeObj	*screenMode;
+static void	*frameBuffer;
+static vu8	readyForCopy;
+#define	FIFO_SIZE (256*1024)
+
+s16	vertices[] ATTRIBUTE_ALIGN(32) = {
+	0, 15, 0,
+	-15, -15, 0,
+	15,	-15, 0};
+
+u8 colors[]	ATTRIBUTE_ALIGN(32)	= {
+	255, 0,	0, 255,		// red
+	0, 255,	0, 255,		// green
+	0, 0, 255, 255};	// blue
+
+void update_screen(Mtx viewMatrix);
+static void	copy_buffers(u32 unused);
+static void	test_peek(u16 x, u16 y);
+
+int	main(void) {
+	Mtx	view;
+	Mtx	projection;
+	GXColor	backgroundColor	= {0, 0, 0,	255};
+	void *fifoBuffer = NULL;
+
+	VIDEO_Init();		
+	WPAD_Init();
+
+	screenMode = VIDEO_GetPreferredMode(NULL);
+
+	frameBuffer	= MEM_K0_TO_K1(SYS_AllocateFramebuffer(screenMode));
+
+	// Initialise the console, required for printf
+	console_init(frameBuffer,20,20,screenMode->fbWidth,screenMode->xfbHeight,screenMode->fbWidth*VI_DISPLAY_PIX_SZ);
+
+	VIDEO_Configure(screenMode);
+	VIDEO_SetNextFramebuffer(frameBuffer);
+	VIDEO_SetPostRetraceCallback(copy_buffers);
+	VIDEO_SetBlack(FALSE);
+	VIDEO_Flush();
+
+
+
+	fifoBuffer = MEM_K0_TO_K1(memalign(32,FIFO_SIZE));
+	memset(fifoBuffer,	0, FIFO_SIZE);
+
+	GX_Init(fifoBuffer, FIFO_SIZE);
+	GX_SetCopyClear(backgroundColor, 0x00ffffff);
+	GX_SetViewport(0,0,screenMode->fbWidth,screenMode->efbHeight,0,1);
+	GX_SetDispCopyYScale((f32)screenMode->xfbHeight/(f32)screenMode->efbHeight);
+	GX_SetScissor(0,0,screenMode->fbWidth,screenMode->efbHeight);
+	GX_SetDispCopySrc(0,0,screenMode->fbWidth,screenMode->efbHeight);
+	GX_SetDispCopyDst(screenMode->fbWidth,screenMode->xfbHeight);
+	GX_SetCopyFilter(screenMode->aa,screenMode->sample_pattern,
+					 GX_TRUE,screenMode->vfilter);
+	GX_SetFieldMode(screenMode->field_rendering,
+					((screenMode->viHeight==2*screenMode->xfbHeight)?GX_ENABLE:GX_DISABLE));
+
+	GX_SetCullMode(GX_CULL_NONE);
+	GX_CopyDisp(frameBuffer,GX_TRUE);
+	GX_SetDispCopyGamma(GX_GM_1_0);
+
+	guVector camera =	{0.0F, 0.0F, 0.0F};
+	guVector up =	{0.0F, 1.0F, 0.0F};
+	guVector look	= {0.0F, 0.0F, -1.0F};
+
+	guPerspective(projection, 60, 1.33F, 10.0F,	300.0F);
+	GX_LoadProjectionMtx(projection, GX_PERSPECTIVE);
+
+	GX_ClearVtxDesc();
+	GX_SetVtxDesc(GX_VA_POS, GX_INDEX8);
+	GX_SetVtxDesc(GX_VA_CLR0, GX_INDEX8);
+	GX_SetVtxAttrFmt(GX_VTXFMT0, GX_VA_POS,	GX_POS_XYZ,	GX_S16,	0);
+	GX_SetVtxAttrFmt(GX_VTXFMT0, GX_VA_CLR0, GX_CLR_RGBA, GX_RGBA8,	0);
+	GX_SetArray(GX_VA_POS, vertices, 3*sizeof(s16));
+	GX_SetArray(GX_VA_CLR0,	colors,	4*sizeof(u8));
+	GX_SetNumChans(1);
+	GX_SetNumTexGens(0);
+	GX_SetTevOrder(GX_TEVSTAGE0, GX_TEXCOORDNULL, GX_TEXMAP_NULL, GX_COLOR0A0);
+	GX_SetTevOp(GX_TEVSTAGE0, GX_PASSCLR);
+
+	while (1)
+	{
+		guLookAt(view, &camera,	&up, &look);
+		GX_SetViewport(0,0,screenMode->fbWidth,screenMode->efbHeight,0,1);
+		GX_InvVtxCache();
+		GX_InvalidateTexAll();
+		update_screen(view);
+
+		WPAD_ScanPads();
+		if (WPAD_ButtonsDown(0) & WPAD_BUTTON_HOME) exit(0);
+	}
+	return 0;
+}
+
+void update_screen(	Mtx	viewMatrix )
+{
+	Mtx	modelView;
+
+	guMtxIdentity(modelView);
+	guMtxTransApply(modelView, modelView, 0.0F,	0.0F, -50.0F);
+	guMtxConcat(viewMatrix,modelView,modelView);
+
+	GX_LoadPosMtxImm(modelView,	GX_PNMTX0);
+
+	GX_Begin(GX_TRIANGLES, GX_VTXFMT0, 3);
+
+	GX_Position1x8(0);
+	GX_Color1x8(0);
+	GX_Position1x8(1);
+	GX_Color1x8(1);
+	GX_Position1x8(2);
+	GX_Color1x8(2);
+
+	GX_End();
+
+	GX_DrawDone();
+	readyForCopy = GX_TRUE;
+
+	// The console understands VT terminal escape codes
+	// This positions the cursor on row 2, column 0
+	// we can use variables for this with format codes too
+	// e.g. printf ("\x1b[%d;%dH", row, column );
+	printf("\x1b[2;0H");
+
+	test_peek(320, 264);
+
+	VIDEO_WaitVSync();
+	return;
+}
+
+static void	copy_buffers(u32 count __attribute__ ((unused)))
+{
+	if (readyForCopy==GX_TRUE) {
+		GX_PokeZMode(GX_TRUE, GX_ALWAYS, GX_TRUE);
+		GX_SetColorUpdate(GX_TRUE);
+		GX_CopyDisp(frameBuffer,GX_TRUE);
+		GX_Flush();
+		readyForCopy = GX_FALSE;
+	}
+}
+
+static void	test_peek(u16 x, u16 y)
+{
+	u32 z = 0;
+
+	// Test a peek
+	GX_PeekZ(x, y, &z);
+	printf("Z Peek: %d\n",z);
+
+	// Compare to hardware
+	if (z != HW_PEEK)
+		printf("The Z value is INACCURATE!\n");
+	else
+		printf("The Z value is accurate.\n");
+
+	// Mark the location
+	GX_PokeBlendMode(GX_BM_LOGIC, 1, 0, GX_LO_COPY);
+	GX_PokeColorUpdate(GX_TRUE);
+	GXColor color = { 255, 255, 0, 255 };
+	GX_PokeARGB(x, y, color);
+}