libgui|GLTarget: Clearing buffers

skyjake · Apr 25, 2013 · d76d59d · d76d59d
1 parent 8cfc38d
commit d76d59d
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Showing 2 changed files with 35 additions and 0 deletions.
diff --git a/doomsday/libgui/include/de/gui/gltarget.h b/doomsday/libgui/include/de/gui/gltarget.h
@@ -110,6 +110,20 @@ class LIBGUI_PUBLIC GLTarget : public Asset
      */
     QImage toImage() const;
 
+    /**
+     * Sets the color for clearing the target (see clear()).
+     *
+     * @param color  Color for clearing.
+     */
+    void setClearColor(Vector4f const &color);
+
+    /**
+     * Clears the contents of the render target's attached buffers.
+     *
+     * @param attachments  Which ones to clear.
+     */
+    void clear(Flags const &attachments);
+
 private:
     DENG2_PRIVATE(d)
 };

diff --git a/doomsday/libgui/src/gltarget.cpp b/doomsday/libgui/src/gltarget.cpp
@@ -44,6 +44,7 @@ DENG2_OBSERVES(Asset, Deletion)
     Flags flags;
     GLTexture *texture;
     Vector2ui size;
+    Vector4f clearColor;
 
     Instance(Public *i)
         : Base(i), fbo(0), flags(DefaultFlags), texture(0)
@@ -229,6 +230,26 @@ QImage GLTarget::toImage() const
     return QImage();
 }
 
+void GLTarget::setClearColor(Vector4f const &color)
+{
+    d->clearColor = color;
+}
+
+void GLTarget::clear(Flags const &attachments)
+{
+    glBind();
+
+    // Only clear what we have.
+    Flags which = attachments & d->flags;
+
+    glClearColor(d->clearColor.x, d->clearColor.y, d->clearColor.z, d->clearColor.w);
+    glClear((which & Color?   GL_COLOR_BUFFER_BIT   : 0) |
+            (which & Depth?   GL_DEPTH_BUFFER_BIT   : 0) |
+            (which & Stencil? GL_STENCIL_BUFFER_BIT : 0));
+
+    GLState::top().target().glBind();
+}
+
 GLuint GLTarget::glName() const
 {
     return d->fbo;