diff -r 1619292eec30 src/render/opengl/SDL_render_gl.c
--- a/src/render/opengl/SDL_render_gl.c	Fri May 10 10:33:15 2013 -0300
+++ b/src/render/opengl/SDL_render_gl.c	Sat May 11 08:01:20 2013 +0200
@@ -794,7 +794,8 @@
 
     if (!SDL_RectEmpty(rect)) {
         data->glEnable(GL_SCISSOR_TEST);
-        data->glScissor(rect->x, rect->h - rect->y, rect->w, rect->h);
+        const int lowerLeft = renderer->viewport.h - rect->y - rect->h;
+        data->glScissor(rect->x, lowerLeft, rect->w, rect->h);
     } else {
         data->glDisable(GL_SCISSOR_TEST);
     }
diff -r 1619292eec30 src/render/opengles/SDL_render_gles.c
--- a/src/render/opengles/SDL_render_gles.c	Fri May 10 10:33:15 2013 -0300
+++ b/src/render/opengles/SDL_render_gles.c	Sat May 11 08:01:20 2013 +0200
@@ -645,7 +645,8 @@
 
     if (!SDL_RectEmpty(rect)) {
         data->glEnable(GL_SCISSOR_TEST);
-        data->glScissor(rect->x, rect->h - rect->y, rect->w, rect->h);
+        const int lowerLeft = renderer->viewport.h - rect->y - rect->h;
+        data->glScissor(rect->x, lowerLeft, rect->w, rect->h);
     } else {
         data->glDisable(GL_SCISSOR_TEST);
     }
diff -r 1619292eec30 src/render/opengles2/SDL_render_gles2.c
--- a/src/render/opengles2/SDL_render_gles2.c	Fri May 10 10:33:15 2013 -0300
+++ b/src/render/opengles2/SDL_render_gles2.c	Sat May 11 08:01:20 2013 +0200
@@ -288,7 +288,8 @@
 
     if (!SDL_RectEmpty(rect)) {
         rdata->glEnable(GL_SCISSOR_TEST);
-        rdata->glScissor(rect->x, rect->h - rect->y, rect->w, rect->h);
+        const int lowerLeft = renderer->viewport.h - rect->y - rect->h;
+        rdata->glScissor(rect->x, lowerLeft, rect->w, rect->h);
     } else {
         rdata->glDisable(GL_SCISSOR_TEST);
     }