1 files changed, 76 insertions, 0 deletions
diff --git a/vcl/inc/opengl/TextureState.hxx b/vcl/inc/opengl/TextureState.hxx
new file mode 100644
index 000000000..fbf2b9cee
--- /dev/null
+++ b/vcl/inc/opengl/TextureState.hxx
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_TEXTURE_STATE_H
+#define INCLUDED_VCL_INC_OPENGL_TEXTURE_STATE_H
+
+#include <vcl/opengl/OpenGLHelper.hxx>
+
+class TextureState
+{
+private:
+    GLuint mnCurrentTextureUnit;
+    std::vector<GLuint> maBoundTextures;
+
+public:
+    TextureState()
+        : mnCurrentTextureUnit(0)
+        , maBoundTextures(4, 0)
+    {}
+
+    static void generate(GLuint& nTexture)
+    {
+        glGenTextures(1, &nTexture);
+        CHECK_GL_ERROR();
+    }
+
+    void active(GLuint nTextureUnit)
+    {
+        if (mnCurrentTextureUnit != nTextureUnit)
+        {
+            glActiveTexture(GL_TEXTURE0 + nTextureUnit);
+            CHECK_GL_ERROR();
+            mnCurrentTextureUnit = nTextureUnit;
+        }
+
+    }
+
+    void bind(GLuint nTexture)
+    {
+        if (maBoundTextures[mnCurrentTextureUnit] != nTexture)
+        {
+            glBindTexture(GL_TEXTURE_2D, nTexture);
+            CHECK_GL_ERROR();
+            maBoundTextures[mnCurrentTextureUnit] = nTexture;
+        }
+    }
+
+    void unbindAndDelete(GLuint nTexture)
+    {
+        unbind(nTexture);
+        glDeleteTextures(1, &nTexture);
+    }
+
+    void unbind(GLuint nTexture)
+    {
+        for (size_t i = 0; i < maBoundTextures.size(); i++)
+        {
+            if (nTexture == maBoundTextures[i])
+                maBoundTextures[i] = 0;
+        }
+    }
+
+};
+
+
+
+#endif // INCLUDED_VCL_INC_OPENGL_TEXTURE_STATE_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */