transition: add wheel transition with variants

Signed-off-by: Javiya Vivekkumar Dineshbhai <vivek.javiya@collabora.com>
Change-Id: Ic72da9383f30f395d07021cd860acb44f2494e13

3 files changed, 84 insertions, 0 deletions

diff --git a/browser/Makefile.am b/browser/Makefile.am
index eaacad46be..8d84ea720e 100644
--- a/browser/Makefile.am
+++ b/browser/Makefile.am
@@ -414,6 +414,7 @@ COOL_JS_LST =\
 	src/slideshow/Transition2d.ts \
 	src/slideshow/PerformTransition.ts \
 	src/slideshow/transition/FadeTransition.ts \
+	src/slideshow/transition/WheelTransition.ts \
 	src/slideshow/transition/WipeTransition.ts \
 	src/dom/PosAnimation.js \
 	src/map/anim/Map.PanAnimation.js \
@@ -851,6 +852,7 @@ pot:
 		src/slideshow/Transition2d.ts \
 		src/slideshow/PerformTransition.ts \
 		src/slideshow/transition/FadeTransition.ts \
+		src/slideshow/transition/WheelTransition.ts \
 		src/core/Socket.js \
 		src/core/Debug.js \
 		src/docstate.js \
diff --git a/browser/src/slideshow/PerformTransition.ts b/browser/src/slideshow/PerformTransition.ts
index 1d858f142e..c61ddbce22 100644
--- a/browser/src/slideshow/PerformTransition.ts
+++ b/browser/src/slideshow/PerformTransition.ts
@@ -20,6 +20,14 @@ app.definitions.PerformTransition = function (
                 image2,
             ).start(1);
             break;
+        case 'WHEEL':
+            // 1,2,3, 4, 8
+            new WheelTransition(
+                canvas,
+                image1,
+                image2,
+            ).start(2);
+            break;
         default:
             console.error('Unknown transition type');
             break;
diff --git a/browser/src/slideshow/transition/WheelTransition.ts b/browser/src/slideshow/transition/WheelTransition.ts
new file mode 100644
index 0000000000..eb0aeec070
--- /dev/null
+++ b/browser/src/slideshow/transition/WheelTransition.ts
@@ -0,0 +1,74 @@
+/*
+ * 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/.
+ */
+
+class WheelTransition extends Transition2d {
+    private stocks: number = 0;
+	constructor(
+		canvas: HTMLCanvasElement,
+		image1: HTMLImageElement,
+		image2: HTMLImageElement,
+	) {
+		super(canvas, image1, image2);
+		this.prepareTransition();
+		this.animationTime = 1500;
+	}
+
+	public renderUniformValue(): void {
+		this.gl.uniform1i(
+			this.gl.getUniformLocation(this.program, 'stocks'),
+			this.stocks,
+		);
+	}
+
+	public start(stocks: number): void {
+		this.stocks = stocks;
+		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;
+
+                uniform sampler2D leavingSlideTexture;
+                uniform sampler2D enteringSlideTexture;
+                uniform float time;
+                uniform int stocks; // Number of stocks
+
+                in vec2 v_texCoord;
+                out vec4 outColor;
+
+                void main() {
+                    vec2 uv = v_texCoord;
+                    float angle = atan(uv.y - 0.5, uv.x - 0.5) + 3.14159265359;
+                    float slice = 6.28318530718 / float(stocks); // 2 * PI divided by number of stocks
+                    float progress = time;
+
+                    if (mod(angle , slice) < slice * progress) {
+                        outColor = texture(enteringSlideTexture, uv);
+                    } else {
+                        outColor = texture(leavingSlideTexture, uv);
+                    }
+                }
+                `;
+	}
+}