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Render: Allow empty cliprect.

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This fixes an issue where an empty cliprect is treated the same as a NULL
cliprect, causing the render backends to disable clipping.

Also adds a new API, SDL_RenderIsClipEnabled(render) that allows you to
differentiate between:
 - SDL_RenderSetClipRect(render, NULL)
 - SDL_Rect r = {0,0,0,0}; SDL_RenderSetClipRect(render, &r);

Fixes https://bugzilla.libsdl.org/show_bug.cgi?id=2504
This commit is contained in:
J?rgen P. Tjern?
2014-04-19 13:15:41 -07:00
parent 36e11d87c8
commit defd90b6f6
11 changed files with 43 additions and 18 deletions
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4
src/render/opengl/SDL_render_gl.c
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@@ -976,10 +976,10 @@ GL_UpdateViewport(SDL_Renderer * renderer)
static int
GL_UpdateClipRect(SDL_Renderer * renderer)
{
const SDL_Rect *rect = &renderer->clip_rect;
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
if (!SDL_RectEmpty(rect)) {
if (renderer->clipping_enabled) {
const SDL_Rect *rect = &renderer->clip_rect;
data->glEnable(GL_SCISSOR_TEST);
data->glScissor(rect->x, renderer->viewport.h - rect->y - rect->h, rect->w, rect->h);
} else {