Transition: Add Wedge transition

Signed-off-by: Javiya Vivekkumar Dineshbhai <vivek.javiya@collabora.com>
Change-Id: I6fa0c053976fb8dcfe67095aaa584ae5ca1e977e

3 files changed, 92 insertions, 0 deletions

diff --git a/browser/Makefile.am b/browser/Makefile.am
index 98f5f7c5e5..5f255478da 100644
--- a/browser/Makefile.am
+++ b/browser/Makefile.am
@@ -416,6 +416,7 @@ COOL_JS_LST =\
 	src/slideshow/transition/FadeTransition.ts \
 	src/slideshow/transition/PlusTransition.ts \
 	src/slideshow/transition/CircleTransition.ts \
+	src/slideshow/transition/WedgeTransition.ts \
 	src/slideshow/transition/OvalTransition.ts \
 	src/slideshow/transition/BoxTransition.ts \
 	src/slideshow/transition/DiamondTransition.ts\
@@ -862,6 +863,7 @@ pot:
 		src/slideshow/transition/FadeTransition.ts \
 		src/slideshow/transition/PlusTransition.ts \
 		src/slideshow/transition/CircleTransition.ts \
+		src/slideshow/transition/WedgeTransition.ts \
 		src/slideshow/transition/BoxTransition.ts \
 		src/slideshow/transition/OvalTransition.ts\
 		src/slideshow/transition/DiamondTransition.ts\
diff --git a/browser/src/slideshow/PerformTransition.ts b/browser/src/slideshow/PerformTransition.ts
index 443cd33a5f..ee76265c73 100644
--- a/browser/src/slideshow/PerformTransition.ts
+++ b/browser/src/slideshow/PerformTransition.ts
@@ -104,6 +104,14 @@ SlideShow.PerformTransition = function (
             ).start(1);
             break;
 
+        case 'WEDGE':
+            new WedgeTransition(
+                canvas,
+                image1,
+                image2,
+            ).start();
+            break;
+
 
 
 
diff --git a/browser/src/slideshow/transition/WedgeTransition.ts b/browser/src/slideshow/transition/WedgeTransition.ts
new file mode 100644
index 0000000000..cebb7a2b96
--- /dev/null
+++ b/browser/src/slideshow/transition/WedgeTransition.ts
@@ -0,0 +1,82 @@
+/*
+ * Copyright the Collabora Online contributors.
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * 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/.
+ */
+
+declare var SlideShow: any;
+
+class WedgeTransition extends SlideShow.Transition2d {
+	constructor(
+		canvas: HTMLCanvasElement,
+		image1: HTMLImageElement,
+		image2: HTMLImageElement,
+	) {
+		super(canvas, image1, image2);
+		this.prepareTransition();
+		this.animationTime = 2000;
+	}
+
+
+	public start(): void {
+		this.startTransition();
+	}
+
+	public getVertexShader(): string {
+		return `#version 300 es
+				in vec4 a_position;
+				in vec2 a_texCoord;
+				out vec2 v_texCoord;
+
+				void main() {
+					gl_Position = a_position;
+					v_texCoord = a_texCoord;
+				}
+				`;
+	}
+
+	public getFragmentShader(): string {
+		return `#version 300 es
+                precision mediump float;
+
+                #define M_PI 3.14159265359
+
+
+                uniform sampler2D leavingSlideTexture;
+                uniform sampler2D enteringSlideTexture;
+                uniform float time;
+
+                in vec2 v_texCoord;
+                out vec4 outColor;
+
+                void main() {
+                    vec2 uv = v_texCoord;
+                    float progress = time;
+
+                    vec2 center = vec2(0.5, 0.5);
+
+                    vec2 dist = uv - center;
+                    float angle = atan(dist.x, dist.y); 
+
+                    if (angle < 0.0) {
+                        angle += 2.0 * M_PI;
+                    }
+
+                    float wedgeAngle = M_PI * progress; 
+
+                    float mask = step(angle, wedgeAngle) + step(2.0 * M_PI - wedgeAngle, angle);
+
+                    mask = min(mask, 1.0);
+
+                    vec4 color1 = texture(leavingSlideTexture, uv);
+                    vec4 color2 = texture(enteringSlideTexture, uv);
+
+                    outColor = mix(color1, color2, mask);
+                }
+                `;
+	}
+}