frontend/gui refactor

src/graphics/GfxContext.cpp

@@ -9,8 +9,13 @@ GfxContext::GfxContext(const GfxContext* parent, Viewport& viewport, Batch2D* g2
 }
 
 GfxContext::~GfxContext() {
+    while (scissorsCount--) {
+        Window::popScissor();
+    }
+
     if (parent == nullptr)
         return;
+        
     if (depthMask_ != parent->depthMask_) {
         glDepthMask(parent->depthMask_);
     }
@@ -77,3 +82,8 @@ void GfxContext::blendMode(blendmode mode) {
     blendMode_ = mode;
     Window::setBlendMode(mode);
 }
+
+void GfxContext::scissors(glm::vec4 area) {
+    Window::pushScissor(area);
+    scissorsCount++;
+}

src/graphics/GfxContext.h

@@ -15,6 +15,7 @@ class GfxContext {
     bool depthTest_ = false;
     bool cullFace_ = false;
     blendmode blendMode_ = blendmode::normal;
+    int scissorsCount = 0;
 public:
     GfxContext(const GfxContext* parent, Viewport& viewport, Batch2D* g2d);
     ~GfxContext();
@@ -27,6 +28,7 @@ public:
     void depthTest(bool flag);
     void cullFace(bool flag);
     void blendMode(blendmode mode);
+    void scissors(glm::vec4 area);
 };
 
 #endif // GRAPHICS_GFX_CONTEXT_H_