X-Git-Url: https://git.cinelerra-gg.org/git/?a=blobdiff_plain;f=cinelerra-5.1%2Fplugins%2Fswapchannels%2Fswapchannels.C;h=3ea0f90067eee9481f2d385607c46d648f2b7d67;hb=9a91a25bfcf0a01f410f2a27584c8a6c524d37d1;hp=99e36b744f04fc555c52f1eb5e635934653581f4;hpb=21c2e6b36d6a96c2f662a89459d607b5a387f4eb;p=goodguy%2Fhistory.git

diff --git a/cinelerra-5.1/plugins/swapchannels/swapchannels.C b/cinelerra-5.1/plugins/swapchannels/swapchannels.C
index 99e36b74..3ea0f900 100644
--- 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);