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[SDL] Bad math in SDL_RenderCopy Mason Wheeler to sdl When I tried to render an image using something other than NULL for srcrect, it got horribly distorted. I traced it down to the fact that the math in the rectangle adjustments performed just before the call to renderer->RenderCopy is written inside out. It should look like this: if (dstrect->w != real_dstrect.w) { int deltax = (dstrect->x - real_dstrect.x); int deltaw = (dstrect->w - real_dstrect.w); real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w; real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w; } if (dstrect->h != real_dstrect.h) { int deltay = (dstrect->y - real_dstrect.y); int deltah = (dstrect->h - real_dstrect.h); real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h; real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
author Sam Lantinga <slouken@libsdl.org>
date Sat, 03 Oct 2009 16:23:16 +0000
parents 94fb40a4a9a7
children
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SDL on Sony Playstation3
------------------------

Installation:
  First, you have to install the Cell SDK
  - Download the Cell SDK installer RPM and ISO images to
    a temporary directory such as /tmp/cellsdk.
  - Mount the image: mount -o loop CellSDK-Devel-Fedora_3.1.0.0.0.iso /tmp/cellsdk
  - Install the SDK installer: rpm -ivh cell-install-3.1.0-0.0.noarch.rpm
  - Install the SDK: cd /opt/cell && ./cellsdk --iso /tmp/cellsdkiso install

  You'll than need to install the SPU-libs
  - Run make ps3-libs && make ps3libs-install

  Finally, install SDL
  - Go to SDL-1.2/ and build SDL like any other GNU style package.
  e.g.
    - Build the configure-script with ./autogen.sh
    - Configure SDL for your needs: ./configure --enable-video-ps3 ...
    - Build and install it: make && make install


Todo:
  - Mouse & Keyboard support
  - On SPU-side the current scaler and converter restrictions are:
    - resolution has to be a multiple of 8 (will work on that)
    - scaler/converter only supports the YV12 and IYUV format
    - the scaler works only bilinear (lanzos would be nice)
  - Optimize the SPU-program handling on the PPE side
  - Integrate spumedia in SDL

Have fun!
  Dirk Herrendoerfer <d.herrendoerfer [at] de [dot ibm [dot] com>