feat(gx): implement scene clear in d3d backend

src/gx/CGxDevice.hpp

@@ -75,6 +75,7 @@ class CGxDevice {
         int32_t intF5C = 0;
         int32_t m_windowVisible = 0;
         int32_t intF64 = 0;
+        int32_t intF6C = 1;
         CBoundingBox m_viewport;
         C44Matrix m_projection;
         C44Matrix m_projNative;

src/gx/d3d/CGxDeviceD3d.cpp

@@ -1595,6 +1595,30 @@ void CGxDeviceD3d::PoolSizeSet(CGxPool* pool, uint32_t size) {
     // TODO
 }
 
+void CGxDeviceD3d::SceneClear(uint32_t mask, CImVector color) {
+    CGxDevice::SceneClear(mask, color);
+
+    if (!this->m_context) {
+        return;
+    }
+
+    uint32_t flags = 0x0;
+    if (mask & 0x1) {
+        flags |= 0x1;
+    }
+    if (mask & 0x2) {
+        flags |= 0x2;
+    }
+
+    if (this->intF6C) {
+        // TODO
+    }
+
+    D3DCOLOR d3dColor = color.b | (color.g | (color.r << 8) << 8);
+
+    this->m_d3dDevice->Clear(0, nullptr, flags, d3dColor, 1.0f, 0);
+}
+
 void CGxDeviceD3d::ScenePresent() {
     if (this->m_context) {
         CGxDevice::ScenePresent();

src/gx/d3d/CGxDeviceD3d.hpp

@@ -244,6 +244,7 @@ class CGxDeviceD3d : public CGxDevice {
     virtual void CapsWindowSize(CRect& dst);
     virtual void CapsWindowSizeInScreenCoords(CRect& dst);
     virtual void ScenePresent();
+    virtual void SceneClear(uint32_t mask, CImVector color);
     virtual void Draw(CGxBatch* batch, int32_t indexed);
     virtual void PoolSizeSet(CGxPool* pool, uint32_t size);
     virtual char* BufLock(CGxBuf* buf);