From d563f38a0d77161e68ec89e4c2dd3fb3e3107777 Mon Sep 17 00:00:00 2001 From: Sam Lantinga Date: Sun, 5 Feb 2023 08:28:26 -0800 Subject: [PATCH] Note that the renderer will by default scale from window coordinates to pixels --- docs/README-migration.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/docs/README-migration.md b/docs/README-migration.md index f24c80bba4..b5b9a1ebeb 100644 --- a/docs/README-migration.md +++ b/docs/README-migration.md @@ -596,6 +596,13 @@ which index is the "opengl" or whatnot driver, you can just pass that string dir here, now. Passing NULL is the same as passing -1 here in SDL2, to signify you want SDL to decide for you. +When a renderer is created, it will automatically set the logical size to the size of +the window in screen coordinates. For high DPI displays, this will set up scaling from +window coordinates to pixels. You can disable this scaling with: +```c + SDL_SetRenderLogicalPresentation(renderer, 0, 0, SDL_LOGICAL_PRESENTATION_DISABLED, SDL_SCALEMODE_NEAREST); +``` + Mouse and touch events are no longer filtered to change their coordinates, instead you can call SDL_ConvertEventToRenderCoordinates() to explicitly map event coordinates into the rendering viewport.