Add poke z 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 pokez         pokez.cpp)

gxtest/pokez.cpp

@@ -0,0 +1,181 @@
+// 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>
+
+GXRModeObj *screenMode;
+static void *frameBuffer;
+static vu8 readyForCopy;
+static u32 depthTest;
+#define FIFO_SIZE (256*1024)
+
+// Amount of pixels to poke z values to each frame.
+// Increase this value to speed up the test.
+#define WORKERS 1000
+
+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);
+
+int main(void) {
+    Mtx view;
+    Mtx projection;
+    GXColor backgroundColor = {0, 0, 0, 255};
+    void *fifoBuffer = NULL;
+    depthTest = 0;
+
+    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");
+
+    printf("Testing Z pokes: %d %%\n", (100 * depthTest) / 0xFFFFFF);
+
+    // Poke z values
+    u32 i;
+    for (i = 0; i < WORKERS && depthTest + i <= 0xFFFFFF; i++) {
+        u32 x = i % screenMode->fbWidth;
+        u32 y = i / screenMode->fbWidth;
+        GX_PokeZ(x, y, depthTest + i);
+    }
+
+    u32 z;
+    for (i = 0; i < WORKERS && depthTest + i <= 0xFFFFFF; i++) {
+        u32 x = i % screenMode->fbWidth;
+        u32 y = i / screenMode->fbWidth;
+        GX_PeekZ(x, y, &z);
+        if (z != depthTest + i) {
+            printf("The Z value is INACCURATE!\n");
+            printf("Z Poke: %d -> %d\n", depthTest + i, z);
+            break;
+        }
+    }
+
+    if (depthTest > 0xFFFFFF)
+        printf("The Z values are accurate.\n");
+    else
+        depthTest += i;
+
+    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;
+    }
+}