opengl: fix clearing the depth buffer.

src/modules/graphics/opengl/OpenGL.cpp

@@ -101,8 +101,8 @@ OpenGL::CleanClearState::CleanClearState(GLbitfield clearFlags)
 	if ((clearFlags & GL_COLOR_BUFFER_BIT) != 0 && colorWriteMask != LOVE_UINT32_MAX)
 		gl.setColorWriteMask(LOVE_UINT32_MAX);
 
-	if ((clearFlags & GL_DEPTH_BUFFER_BIT) != 0 && depthWrites)
-		gl.setDepthWrites(false);
+	if ((clearFlags & GL_DEPTH_BUFFER_BIT) != 0 && !depthWrites)
+		gl.setDepthWrites(true);
 
 	if ((clearFlags & GL_STENCIL_BUFFER_BIT) != 0 && (stencilWriteMask & 0xFF) != 0xFF)
 		gl.setStencilWriteMask(LOVE_UINT32_MAX);
@@ -116,7 +116,7 @@ OpenGL::CleanClearState::~CleanClearState()
 	if ((clearFlags & GL_COLOR_BUFFER_BIT) != 0 && colorWriteMask != LOVE_UINT32_MAX)
 		gl.setColorWriteMask(colorWriteMask);
 
-	if ((clearFlags & GL_DEPTH_BUFFER_BIT) != 0 && depthWrites)
+	if ((clearFlags & GL_DEPTH_BUFFER_BIT) != 0 && !depthWrites)
 		gl.setDepthWrites(depthWrites);
 
 	if ((clearFlags & GL_STENCIL_BUFFER_BIT) != 0 && (stencilWriteMask & 0xFF) != 0xFF)