Add an alpha channel flag to Pipeline

[libs/gl.git] / source / pipeline.cpp

diff --git a/source/pipeline.cpp b/source/pipeline.cpp
index 53b51d7924bc91cfeb6b8c4e84ef6cf24134061a..fa06fc5c0a985021a20353b1752cb849664e2a59 100644 (file)
--- a/source/pipeline.cpp
+++ b/source/pipeline.cpp
@@ -38,6 +38,7 @@ void Pipeline::init(unsigned w, unsigned h)
        width = w;
        height = h;
        hdr = false;
+       alpha = false;
        samples = 0;
        target_ms = 0;
        target[0] = 0;
@@ -69,6 +70,24 @@ void Pipeline::set_hdr(bool h)
        }
 }
 
+void Pipeline::set_alpha(bool a)
+{
+       if(a==alpha)
+               return;
+
+       bool old_alpha = alpha;
+       alpha = a;
+       try
+       {
+               create_targets(2);
+       }
+       catch(...)
+       {
+               alpha = old_alpha;
+               throw;
+       }
+}
+
 void Pipeline::set_multisample(unsigned s)
 {
        if(s==samples)
@@ -269,7 +288,7 @@ void Pipeline::create_targets(unsigned recreate)
                target_ms = 0;
        }
 
-       PixelFormat color_pf = (hdr ? RGB16F : RGB);
+       PixelFormat color_pf = (hdr ? (alpha ? RGBA16F : RGB16F) : (alpha ? RGBA : RGB));
        RenderTargetFormat fmt = (RENDER_COLOR,color_pf, RENDER_DEPTH);
        if(!postproc.empty() || samples)
        {