1 files changed, 116 insertions, 0 deletions
diff --git a/slideshow/opengl/vortexGeometryShader.glsl b/slideshow/opengl/vortexGeometryShader.glsl
new file mode 100644
index 000000000..5d64a1249
--- /dev/null
+++ b/slideshow/opengl/vortexGeometryShader.glsl
@@ -0,0 +1,116 @@
+/* -*- 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 150
+
+layout(triangles) in;
+layout(triangle_strip, max_vertices=11) out;
+
+uniform float shadow;
+uniform mat4 u_projectionMatrix;
+uniform mat4 orthoProjectionMatrix;
+uniform mat4 orthoViewMatrix;
+
+in vec2 g_texturePosition[];
+in vec3 g_normal[];
+in mat4 modelViewMatrix[];
+in mat4 transform[];
+in float nTime[];
+in float startTime[];
+in float endTime[];
+
+out vec2 v_texturePosition;
+out vec3 v_normal;
+out vec4 shadowCoordinate;
+
+mat4 identityMatrix(void)
+{
+    return mat4(1.0, 0.0, 0.0, 0.0,
+                0.0, 1.0, 0.0, 0.0,
+                0.0, 0.0, 1.0, 0.0,
+                0.0, 0.0, 0.0, 1.0);
+}
+
+mat4 scaleMatrix(vec3 axis)
+{
+    mat4 matrix = identityMatrix();
+    matrix[0][0] = axis.x;
+    matrix[1][1] = axis.y;
+    matrix[2][2] = axis.z;
+    return matrix;
+}
+
+mat4 translationMatrix(vec3 axis)
+{
+    mat4 matrix = identityMatrix();
+    matrix[3] = vec4(axis, 1.0);
+    return matrix;
+}
+
+void emitHexagonVertex(int index, vec3 translation, float fdsq)
+{
+    mat4 projectionMatrix;
+    mat4 shadowMatrix;
+
+    if (shadow < 0.5) {
+        projectionMatrix = u_projectionMatrix;
+        shadowMatrix = orthoProjectionMatrix * orthoViewMatrix;
+    } else {
+        projectionMatrix = orthoProjectionMatrix * orthoViewMatrix;
+        shadowMatrix = mat4(0.0);
+    }
+
+    mat4 normalMatrix = transpose(inverse(modelViewMatrix[index]));
+
+    vec4 pos = gl_in[index].gl_Position + vec4(translation, 0.0);
+
+    // Apply our transform operations.
+    pos = transform[index] * pos;
+
+    v_normal = normalize(vec3(normalMatrix * transform[index] * vec4(g_normal[index], 0.0)));
+    v_normal.z *= fdsq;
+
+    gl_Position = projectionMatrix * modelViewMatrix[index] * pos;
+    shadowCoordinate = translationMatrix(vec3(0.5, 0.5, 0.5)) * scaleMatrix(vec3(0.5, 0.5, 0.5)) * shadowMatrix * modelViewMatrix[index] * pos;
+    v_texturePosition = g_texturePosition[index];
+    EmitVertex();
+}
+
+void main()
+{
+    const vec4 invalidPosition = vec4(-256.0, -256.0, -256.0, -256.0);
+    const vec3 noTranslation = vec3(0.0, 0.0, 0.0);
+
+    if (gl_in[0].gl_Position == invalidPosition)
+        return;
+
+    // Draw “walls” to the hexagons.
+    if (nTime[0] > startTime[0] && nTime[0] <= endTime[0]) {
+        const vec3 translation = vec3(0.0, 0.0, -0.02);
+
+        emitHexagonVertex(2, noTranslation, 0.3);
+        emitHexagonVertex(2, translation, 0.3);
+
+        for (int i = 0; i < 3; ++i) {
+            emitHexagonVertex(i, noTranslation, 0.3);
+            emitHexagonVertex(i, translation, 0.3);
+        }
+
+        EndPrimitive();
+    }
+
+    // Draw the main quad part.
+    for (int i = 0; i < 3; ++i) {
+        emitHexagonVertex(i, noTranslation, 1.0);
+    }
+
+    EndPrimitive();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */