extract shaders to own file and use shared shader loading

Change-Id: I1af7e03a3e46f3cb49162be9351ce22f54d08c52

canvas/Library_oglcanvas.mk

@@ -20,6 +20,7 @@ $(eval $(call gb_Library_use_libraries,oglcanvas,\
 	cppuhelper \
 	comphelper \
 	vcl \
+	vclopengl \
 	tk \
 	tl \
 	i18nlangtag \

canvas/Module_canvas.mk

@@ -24,6 +24,7 @@ $(eval $(call gb_Module_add_targets,canvas,\
 	Library_canvastools \
 	Library_simplecanvas \
 	Library_vclcanvas \
+	Package_opengl \
 ))
 
 ifeq ($(ENABLE_CAIRO_CANVAS),TRUE)

canvas/Package_opengl.mk

+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# 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/.
+#
+
+$(eval $(call gb_Package_Package,canvas_opengl_shader,$(SRCDIR)/canvas/opengl))
+
+$(eval $(call gb_Package_add_files,canvas_opengl_shader,$(LIBO_BIN_FOLDER)/opengl,\
+	dummyVertexShader.glsl \
+	linearMultiColorGradientFragmentShader.glsl \
+	linearTwoColorGradientFragmentShader.glsl \
+	radialMultiColorGradientFragmentShader.glsl \
+	radialTwoColorGradientFragmentShader.glsl \
+	rectangularMultiColorGradientFragmentShader.glsl \
+	rectangularTwoColorGradientFragmentShader.glsl \
+))
+
+# vim: set noet sw=4 ts=4:

canvas/opengl/dummyVertexShader.glsl

+/* -*- 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 v_textureCoords2d;
+void main(void)
+{
+    gl_Position = ftransform();
+    v_textureCoords2d = gl_MultiTexCoord0.st;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

canvas/opengl/linearMultiColorGradientFragmentShader.glsl

+/* -*- 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/.
+ */
+
+#version 120
+
+uniform int       i_nColors;
+uniform sampler1D t_colorArray4d;
+uniform sampler1D t_stopArray1d;
+uniform mat3x2    m_transform;
+varying vec2      v_textureCoords2d;
+
+int findBucket(float t)
+{
+    int nMinBucket=0;
+    while( nMinBucket < i_nColors &&
+            texture1D(t_stopArray1d, nMinBucket).s < t )
+        ++nMinBucket;
+    return max(nMinBucket-1,0);
+}
+
+void main(void)
+{
+    const float fAlpha =
+        clamp( (m_transform * vec3(v_textureCoords2d,1)).s,
+                0.0, 1.0 );
+
+    const int nMinBucket=findBucket( fAlpha );
+
+    const float fLerp =
+        (fAlpha-texture1D(t_stopArray1d, nMinBucket).s) /
+        (texture1D(t_stopArray1d, nMinBucket+1).s -
+         texture1D(t_stopArray1d, nMinBucket).s);
+
+    gl_FragColor = mix(texture1D(t_colorArray4d, nMinBucket),
+            texture1D(t_colorArray4d, nMinBucket+1),
+            fLerp);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

canvas/opengl/linearTwoColorGradientFragmentShader.glsl

+/* -*- 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/.
+ */
+
+#version 120
+
+uniform vec4   v_startColor4d;
+uniform vec4   v_endColor4d;
+uniform mat3x2 m_transform;
+varying vec2   v_textureCoords2d;
+
+void main(void)
+{
+    gl_FragColor = mix(v_startColor4d,
+            v_endColor4d,
+            clamp(
+                (m_transform * vec3(v_textureCoords2d,1)).s,
+                0.0, 1.0));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

canvas/opengl/radialMultiColorGradientFragmentShader.glsl

+/* -*- 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/.
+ */
+
+#version 120
+
+uniform int       i_nColors;
+uniform sampler1D t_colorArray4d;
+uniform sampler1D t_stopArray1d;
+uniform mat3x2    m_transform;
+varying vec2      v_textureCoords2d;
+const vec2        v_center2d = vec2(0,0);
+
+int findBucket(float t)
+{
+    int nMinBucket=0;
+    while( nMinBucket < i_nColors &&
+            texture1D(t_stopArray1d, nMinBucket).s < t )
+        ++nMinBucket;
+    return max(nMinBucket-1,0);
+}
+
+void main(void)
+{
+    const float fAlpha =
+        clamp( 1.0 - distance(
+                    vec2( m_transform * vec3(v_textureCoords2d,1)),
+                    v_center2d),
+                0.0, 1.0 );
+
+    const int nMinBucket=findBucket( fAlpha );
+
+    const float fLerp =
+        (fAlpha-texture1D(t_stopArray1d, nMinBucket).s) /
+        (texture1D(t_stopArray1d, nMinBucket+1).s -
+         texture1D(t_stopArray1d, nMinBucket).s);
+
+    gl_FragColor = mix(texture1D(t_colorArray4d, nMinBucket),
+            texture1D(t_colorArray4d, nMinBucket+1),
+            fLerp);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

canvas/opengl/radialTwoColorGradientFragmentShader.glsl

+/* -*- 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/.
+ */
+
+#version 120
+
+uniform vec4   v_startColor4d;
+uniform vec4   v_endColor4d;
+uniform mat3x2 m_transform;
+varying vec2   v_textureCoords2d;
+const vec2     v_center2d = vec2(0,0);
+
+void main(void)
+{
+    gl_FragColor = mix(v_startColor4d,
+            v_endColor4d,
+            1.0 - distance(
+                vec2(
+                    m_transform * vec3(v_textureCoords2d,1)),
+                v_center2d));
+    }
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

canvas/opengl/rectangularMultiColorGradientFragmentShader.glsl

+/* -*- 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/.
+ */
+
+#version 120
+
+uniform int       i_nColors;
+uniform sampler1D t_colorArray4d;
+uniform sampler1D t_stopArray1d;
+uniform mat3x2    m_transform;
+varying vec2      v_textureCoords2d;
+
+int findBucket(float t)
+{
+    int nMinBucket=0;
+    while( nMinBucket < i_nColors &&
+            texture1D(t_stopArray1d, nMinBucket).s < t )
+        ++nMinBucket;
+    return max(nMinBucket-1,0);
+}
+
+void main(void)
+{
+    const vec2  v = abs( vec2(m_transform * vec3(v_textureCoords2d,1)) );
+    const float fAlpha = 1 - max(v.x, v.y);
+
+    const int nMinBucket=findBucket( fAlpha );
+
+    const float fLerp =
+        (fAlpha-texture1D(t_stopArray1d, nMinBucket).s) /
+        (texture1D(t_stopArray1d, nMinBucket+1).s -
+         texture1D(t_stopArray1d, nMinBucket).s);
+
+    gl_FragColor = mix(texture1D(t_colorArray4d, nMinBucket),
+            texture1D(t_colorArray4d, nMinBucket+1),
+            fLerp);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

canvas/opengl/rectangularTwoColorGradientFragmentShader.glsl

+/* -*- 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/.
+ */
+
+#version 120
+
+uniform vec4   v_startColor4d;
+uniform vec4   v_endColor4d;
+uniform mat3x2 m_transform;
+varying vec2   v_textureCoords2d;
+void main(void)
+{
+    const vec2 v = abs( vec2(m_transform * vec3(v_textureCoords2d,1)) );
+    const float t = max(v.x, v.y);
+    gl_FragColor = mix(v_startColor4d,
+            v_endColor4d,
+            1.0-t);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */