Fix cursor flicker on nvidia when capturing monitor

Thanks to David Kleuker for bug testing

src/capture/v4l2.c

@@ -553,6 +553,9 @@ static int gsr_capture_v4l2_capture(gsr_capture *cap, gsr_capture_metadata *capt
     const vec2i target_pos = gsr_capture_get_target_position(output_size, capture_metadata);
 
     self->params.egl->glFlush();
+    // TODO: Use the minimal barrier required
+    self->params.egl->glMemoryBarrier(GL_ALL_BARRIER_BITS);
+    // TODO: Remove this?
     if(self->params.egl->gpu_info.vendor == GSR_GPU_VENDOR_NVIDIA)
         self->params.egl->glFinish();
 

src/color_conversion.c

@@ -781,7 +781,6 @@ static void gsr_color_conversion_draw_graphics(gsr_color_conversion *self, unsig
     self->params.egl->glBindBuffer(GL_ARRAY_BUFFER, self->vertex_buffer_object_id);
     self->params.egl->glBufferSubData(GL_ARRAY_BUFFER, 0, 24 * sizeof(float), vertices);
 
-    // TODO:
     switch(source_color) {
         case GSR_SOURCE_COLOR_RGB:
         case GSR_SOURCE_COLOR_BGR: {

src/egl.c

@@ -523,4 +523,7 @@ void gsr_egl_swap_buffers(gsr_egl *self) {
     self->glFlush();
     // TODO: Use the minimal barrier required
     self->glMemoryBarrier(GL_ALL_BARRIER_BITS); // GL_SHADER_IMAGE_ACCESS_BARRIER_BIT
+    // TODO: This is needed on nvidia because the cursor can flicker otherwise. Find a better solution
+    if(self->gpu_info.vendor == GSR_GPU_VENDOR_NVIDIA)
+        self->glFinish();
 }