glthread: blit OSD manually

to help debugging of framebuffer issues, only blit the openGL
framebuffer after an explicit blit() call

src/driver/fbaccel.cpp

@@ -30,6 +30,9 @@
 #endif
 
 #include <driver/framebuffer.h>
+#ifdef USE_OPENGL
+#include "glthread.h"
+#endif
 
 #include <stdio.h>
 #include <fcntl.h>
@@ -821,6 +824,10 @@ void CFbAccel::blit()
 /* not azbox and not spark -> no blit() needed */
 void CFbAccel::blit()
 {
+#ifdef USE_OPENGL
+	if (fb->mpGLThreadObj)
+		fb->mpGLThreadObj->blit();
+#endif
 }
 #endif
 

src/driver/glthread.cpp

@@ -338,7 +338,12 @@ void GLThreadObj::render() {
 	}
 
 	// bltDisplayBuffer(); /* decoded video stream */
-	bltOSDBuffer(); /* OSD */
+	if (mState.blit) {
+		/* only blit manually after fb->blit(), this helps to find missed blit() calls */
+		mState.blit = false;
+		//fprintf(stderr, "blit!\n");
+		bltOSDBuffer(); /* OSD */
+	}
 
 	glBindTexture(GL_TEXTURE_2D, mState.osdtex);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

src/driver/glthread.h

@@ -29,6 +29,7 @@
 #include <GL/glew.h>
 #include <GL/freeglut.h>
 #include <GL/gl.h>
+#include "rcinput.h"
 
 //class SWDecoder;
 
@@ -51,6 +52,7 @@ public:
 
 	int getOSDWidth() { return mState.width; }
 	int getOSDHeight() { return mState.height; }
+	void blit() { mState.blit = true; }
 
 	void clear();
 
@@ -92,6 +94,7 @@ private:
 		// GLuint displaytex;	/* holds the display texture */
 		// GLuint displaypbo;
 		int go3d;
+		bool blit;
 	} mState;
 
 	// boost::shared_ptr<SWDecoder>mpSWDecoder; /* our Decoder-Object that runs in its own thread */