Allow suppressing clear in a sequence by passing in a special tag

[libs/gl.git] / source / render / sequence.cpp

diff --git a/source/render/sequence.cpp b/source/render/sequence.cpp
index e0fb408fad95aa274d63171c5b8f5b012c56d50a..f7dea9bf617ebf1db173fec541408b0735b4989b 100644 (file)
--- a/source/render/sequence.cpp
+++ b/source/render/sequence.cpp
@@ -12,6 +12,8 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
+Tag Sequence::noclear_tag = "noclear";
+
 Sequence::Sequence(unsigned w, unsigned h, const FrameFormat &f):
        width(w),
        height(h),
@@ -105,7 +107,7 @@ void Sequence::finish_frame()
 
 void Sequence::render(Renderer &renderer, Tag tag) const
 {
-       if(tag.id)
+       if(tag.id && tag!=noclear_tag)
                return;
 
        Renderer::Push _push(renderer);
@@ -115,7 +117,7 @@ void Sequence::render(Renderer &renderer, Tag tag) const
        if(target[0])
                renderer.set_framebuffer(&(target_ms ? target_ms : target[0])->get_framebuffer());
 
-       if(clear_enabled)
+       if(clear_enabled && tag!=noclear_tag)
        {
                const Framebuffer *target_fbo = renderer.get_framebuffer();
                if(!target_fbo)