opengl colorspace + BT2020

[goodguy/history.git] / cinelerra-5.1 / plugins / swapchannels / swapchannels.C

diff --git a/cinelerra-5.1/plugins/swapchannels/swapchannels.C b/cinelerra-5.1/plugins/swapchannels/swapchannels.C
index 99e36b744f04fc555c52f1eb5e635934653581f4..3ea0f90067eee9481f2d385607c46d648f2b7d67 100644 (file)
--- a/cinelerra-5.1/plugins/swapchannels/swapchannels.C
+++ b/cinelerra-5.1/plugins/swapchannels/swapchannels.C
@@ -497,13 +497,13 @@ int SwapMain::handle_opengl()
        get_output()->clear_pbuffer();
        get_output()->bind_texture(0);
 
-       unsigned int shader_id = VFrame::make_shader(0,
-               output_frag,
-               0);
-       glUseProgram(shader_id);
-       glUniform1i(glGetUniformLocation(shader_id, "tex"), 0);
-       glUniform1f(glGetUniformLocation(shader_id, "chroma_offset"),
-               BC_CModels::is_yuv(get_output()->get_color_model()) ? 0.5 : 0.0);
+       unsigned int shader = VFrame::make_shader(0, output_frag, 0);
+       if( shader > 0 ) {
+               glUseProgram(shader);
+               glUniform1i(glGetUniformLocation(shader, "tex"), 0);
+               glUniform1f(glGetUniformLocation(shader, "chroma_offset"),
+                       BC_CModels::is_yuv(get_output()->get_color_model()) ? 0.5 : 0.0);
+       }
 
        get_output()->draw_texture();
        glUseProgram(0);