History

Caolán McNamara 7bbe74b2be cid#1555789 COPY_INSTEAD_OF_MOVE and cid#1556865 COPY_INSTEAD_OF_MOVE cid#1556871 COPY_INSTEAD_OF_MOVE cid#1556939 COPY_INSTEAD_OF_MOVE cid#1556951 COPY_INSTEAD_OF_MOVE cid#1556964 COPY_INSTEAD_OF_MOVE cid#1556966 COPY_INSTEAD_OF_MOVE cid#1556968 COPY_INSTEAD_OF_MOVE cid#1556971 COPY_INSTEAD_OF_MOVE cid#1556989 COPY_INSTEAD_OF_MOVE cid#1557001 COPY_INSTEAD_OF_MOVE cid#1557011 COPY_INSTEAD_OF_MOVE cid#1557032 COPY_INSTEAD_OF_MOVE cid#1557038 COPY_INSTEAD_OF_MOVE cid#1557041 COPY_INSTEAD_OF_MOVE cid#1557055 COPY_INSTEAD_OF_MOVE cid#1557056 COPY_INSTEAD_OF_MOVE cid#1557057 COPY_INSTEAD_OF_MOVE cid#1557065 COPY_INSTEAD_OF_MOVE cid#1557068 COPY_INSTEAD_OF_MOVE cid#1557087 COPY_INSTEAD_OF_MOVE cid#1557090 COPY_INSTEAD_OF_MOVE cid#1557093 COPY_INSTEAD_OF_MOVE cid#1557113 COPY_INSTEAD_OF_MOVE cid#1557122 COPY_INSTEAD_OF_MOVE cid#1557126 COPY_INSTEAD_OF_MOVE cid#1557145 COPY_INSTEAD_OF_MOVE cid#1557151 COPY_INSTEAD_OF_MOVE cid#1557152 COPY_INSTEAD_OF_MOVE cid#1557197 COPY_INSTEAD_OF_MOVE cid#1557216 COPY_INSTEAD_OF_MOVE cid#1557245 COPY_INSTEAD_OF_MOVE cid#1557272 COPY_INSTEAD_OF_MOVE cid#1557310 COPY_INSTEAD_OF_MOVE cid#1557314 COPY_INSTEAD_OF_MOVE cid#1557318 COPY_INSTEAD_OF_MOVE cid#1557333 COPY_INSTEAD_OF_MOVE cid#1557340 COPY_INSTEAD_OF_MOVE cid#1557358 COPY_INSTEAD_OF_MOVE cid#1557359 COPY_INSTEAD_OF_MOVE cid#1557365 COPY_INSTEAD_OF_MOVE cid#1557367 COPY_INSTEAD_OF_MOVE cid#1557395 COPY_INSTEAD_OF_MOVE cid#1557418 COPY_INSTEAD_OF_MOVE cid#1557488 COPY_INSTEAD_OF_MOVE cid#1557493 COPY_INSTEAD_OF_MOVE cid#1557506 COPY_INSTEAD_OF_MOVE cid#1557514 COPY_INSTEAD_OF_MOVE cid#1557528 COPY_INSTEAD_OF_MOVE cid#1557534 COPY_INSTEAD_OF_MOVE cid#1557537 COPY_INSTEAD_OF_MOVE cid#1557562 COPY_INSTEAD_OF_MOVE cid#1557563 COPY_INSTEAD_OF_MOVE cid#1557592 COPY_INSTEAD_OF_MOVE cid#1557608 COPY_INSTEAD_OF_MOVE cid#1557615 COPY_INSTEAD_OF_MOVE cid#1557619 COPY_INSTEAD_OF_MOVE cid#1557637 COPY_INSTEAD_OF_MOVE cid#1557648 COPY_INSTEAD_OF_MOVE cid#1557712 COPY_INSTEAD_OF_MOVE cid#1557750 COPY_INSTEAD_OF_MOVE cid#1557762 COPY_INSTEAD_OF_MOVE cid#1557765 COPY_INSTEAD_OF_MOVE Change-Id: I10db1910627e04a26e25836c05ad5c2707abd18b Reviewed-on: https://gerrit.libreoffice.org/c/core/+/175696 Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com> Tested-by: Jenkins		2024-10-27 20:19:12 +01:00
..
inc/pch	simplify and modernise ScopedBitmapAccess	2023-12-07 09:32:14 +01:00
opengl	Remove unused 'numTiles' from glitter vertex shader	2024-06-03 15:18:08 +02:00
qa	loplugin:ostr in slideshow	2024-05-13 14:44:04 +02:00
source	cid#1555789 COPY_INSTEAD_OF_MOVE	2024-10-27 20:19:12 +01:00
test	c++20: use std::erase(_if) instead of std::remove(_if)+erase (part 11)	2023-11-19 13:41:30 +01:00
util
CppunitTest_slideshow.mk
CppunitTest_slideshow_engine.mk
IwyuFilter_slideshow.yaml
Library_OGLTrans.mk	Drop remaining boost/shared_pointer debug functionality	2024-03-21 12:28:32 +01:00
Library_slideshow.mk	Drop remaining boost/shared_pointer debug functionality	2024-03-21 12:28:32 +01:00
Makefile
manifest.txt
Module_slideshow.mk
Package_opengl.mk
README.md

README.md

Impress Slideshow Engine

3D Transitions

The 3D transitions are slideshow transition engine using OpenGL and are located in slideshow/source/engine/OGLTrans/. They were initially written by GSOC student Shane.M.Mathews. Radek has later polished the code a bit, added few new 3D transitions, added infrastructure for vertex and fragment shaders. Wrote few transitions with fragment shader too.

Physics Animation Effects

Physics animation effects are simulated by external 2d physics engine library Box2D. They don't directly call Box2D functions but instead use the wrapper in:

slideshow/source/inc/box2dtools.hxx
slideshow/source/engine/box2dtools.cxx

The wrapper has two corresponding classes to manage the Box2D world and Box2D bodies.

When a physics animation starts, a Box2DWorld is initiated and populated with every shape that is part of the foreground (which are shapes that do not belong to the master slide and not a background shape).

After creation until the end of the slide (not the whole slideshow) the Box2D World isn't destroyed and reused. But the bodies that represent the shapes in the slide get destroyed when there's a point in time that there's no physics animation in progress. And recreated when another physics animation starts.

If there are multiple physics animations in parallel only one of them takes the role of stepping through the simulation.

If there are other animation effects that go in parallel which change the shape position, rotation, or visibility - they also report the change to Box2DWorld. These updates are collected in a queue in Box2DWorld and processed before stepping through the simulation. To achieve convincing results these updates are performed by setting the Box2D body's linear velocity or angular velocity instead of setting directly it's position or rotation.