Support rendering YUV formatted frames

src/gles2_debayer.h

@@ -4,8 +4,12 @@
 #include <assert.h>
 #include <stdio.h>
 
+#define SHADER_DEBAYER 1
+#define SHADER_YUV 2
+
 typedef struct {
         int format;
+        int shader;
         float forward_matrix[9];
 
         GLuint frame_buffer;