Fixed the logical size for rendering to texture, thanks to Mason Wheeler.

Mason Wheeler

The SDL_RenderGetLogicalSize function should always return the amount of pixels that are currently available for rendering to. But after updating to the latest SDL2, I started getting crashes because it was returning (0,0) as the logical size! After a bit of debugging, I tracked it down to the following code in SDL_SetRenderTarget:

if (texture) {
renderer->viewport.x = 0;
renderer->viewport.y = 0;
renderer->viewport.w = texture->w;
renderer->viewport.h = texture->h;
renderer->scale.x = 1.0f;
renderer->scale.y = 1.0f;
renderer->logical_w = 0;
renderer->logical_h = 0;
}

This is obviously wrong; 0 is never the correct value for a valid renderer. Those last two lines should read:

renderer->logical_w = texture->w;
renderer->logical_h = texture->h;

     1.1 --- a/src/render/SDL_render.c	Sat Jun 29 22:08:38 2013 +0200
     1.2 +++ b/src/render/SDL_render.c	Sat Jun 29 14:40:55 2013 -0700
     1.3 @@ -950,8 +950,8 @@
     1.4          renderer->viewport.h = texture->h;
     1.5          renderer->scale.x = 1.0f;
     1.6          renderer->scale.y = 1.0f;
     1.7 -        renderer->logical_w = 0;
     1.8 -        renderer->logical_h = 0;
     1.9 +        renderer->logical_w = texture->w;
    1.10 +        renderer->logical_h = texture->h;
    1.11      } else {
    1.12          renderer->viewport = renderer->viewport_backup;
    1.13          renderer->clip_rect = renderer->clip_rect_backup;