bloom2: Ensure draws/copies are pixel aligned

src/m_Do/m_Do_graphic.cpp

@@ -1311,6 +1311,12 @@ void mDoGph_gInf_c::bloom_c::draw2() {
         BlurPass0, BlurPassN = BlurPass0 + MaxDivNum,
         MaxTexNum,
     };
+    struct bloom_rect {
+        u16 x;
+        u16 y;
+        u16 w;
+        u16 h;
+    };
     scissor_class divPorts[MaxDivNum];
     divPorts[0] = {0.0f, 0.0f, 1.0f, 1.0f}; // full-size texture
     divPorts[1] = {0.0f, 0.0f, 0.5f, 0.5f}; // bloom texture (wide enough, half-tall)
@@ -1324,22 +1330,35 @@ void mDoGph_gInf_c::bloom_c::draw2() {
         port.height = prev.height * 0.5f;
     }
 
+    bloom_rect divRects[MaxDivNum];
+    for (int i = 0; i < ARRAY_SIZE(divPorts); i++) {
+        auto const& port = divPorts[i];
+        divRects[i] = {
+            static_cast<u16>(port.x_orig * width),
+            static_cast<u16>(port.y_orig * height),
+            static_cast<u16>(port.width * width),
+            static_cast<u16>(port.height * height),
+        };
+    }
+
     auto divCopySrc = [&](int divNo) {
-        auto const& port = divPorts[divNo];
-        GXSetTexCopySrc(port.x_orig * width, port.y_orig * height, port.width * width, port.height * height);
+        auto const& rect = divRects[divNo];
+        GXSetTexCopySrc(rect.x, rect.y, rect.w, rect.h);
     };
 
     TGXTexObj tmpTex[MaxTexNum];
     auto divCopyTex = [&](uintptr_t texNo, int divNo) -> GXTexObj * {
-        auto const& port = divPorts[divNo];
-        CopyToTexObj(&tmpTex[texNo], texNo, port.width * width, port.height * height);
+        auto const& rect = divRects[divNo];
+        CopyToTexObj(&tmpTex[texNo], texNo, rect.w, rect.h);
         return &tmpTex[texNo];
     };
     
     auto divQuad = [&](int divNo) {
-        auto const& port = divPorts[divNo];
-        f32 x0 = port.x_orig, y0 = port.y_orig;
-        f32 x1 = x0 + port.width, y1 = y0 + port.height;
+        auto const& rect = divRects[divNo];
+        f32 x0 = rect.x / width;
+        f32 y0 = rect.y / height;
+        f32 x1 = (rect.x + rect.w) / width;
+        f32 y1 = (rect.y + rect.h) / height;
         GXBegin(GX_QUADS, GX_VTXFMT0, 4);
         GXPosition3f32(x0, y0, -5);
         GXTexCoord2s8(0, 0);