1 files changed, 64 insertions, 0 deletions
diff --git a/vcl/opengl/combinedTextureFragmentShader.glsl b/vcl/opengl/combinedTextureFragmentShader.glsl
new file mode 100644
index 000000000000..d8864cfe21c5
--- /dev/null
+++ b/vcl/opengl/combinedTextureFragmentShader.glsl
@@ -0,0 +1,64 @@
+/* -*- 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/.
+ */
+
+varying vec2 tex_coord;
+varying vec2 alpha_coord;
+varying vec2 mask_coord;
+
+uniform sampler2D texture;
+uniform sampler2D mask;
+uniform sampler2D alpha;
+
+uniform vec4 color;
+
+uniform int type;
+
+#define TYPE_NORMAL       0
+#define TYPE_BLEND        1
+#define TYPE_MASKED       2
+#define TYPE_DIFF         3
+#define TYPE_MASKED_COLOR 4
+
+void main()
+{
+    vec4 texelTexture = texture2D(texture, tex_coord);
+
+    if (type == TYPE_NORMAL)
+    {
+        gl_FragColor = texelTexture;
+    }
+    else if (type == TYPE_BLEND)
+    {
+        vec4 texelMask = texture2D(mask, mask_coord);
+        vec4 texelAlpha = texture2D(alpha, alpha_coord);
+        gl_FragColor = texelTexture;
+        gl_FragColor.a = 1.0 - (1.0 - floor(texelAlpha.r)) * texelMask.r;
+    }
+    else if (type == TYPE_MASKED)
+    {
+        vec4 texelMask = texture2D(mask, mask_coord);
+        gl_FragColor = texelTexture;
+        gl_FragColor.a = 1.0 - texelMask.r;
+    }
+    else if (type == TYPE_DIFF)
+    {
+        vec4 texelMask = texture2D(mask, mask_coord);
+        float alpha = 1.0 - abs(texelTexture.r - texelMask.r);
+        if (alpha > 0.0)
+            gl_FragColor = texelMask / alpha;
+        gl_FragColor.a = alpha;
+    }
+    else if (type == TYPE_MASKED_COLOR)
+    {
+        gl_FragColor = color;
+        gl_FragColor.a = 1.0 - texelTexture.r;
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */