Add color correction to the gles shader

src/gles2_debayer.h

@@ -4,7 +4,23 @@
 #include <assert.h>
 #include <stdio.h>
 
-typedef struct _GLES2Debayer GLES2Debayer;
+typedef struct {
+        int format;
+        float forward_matrix[9];
+
+        GLuint frame_buffer;
+        GLuint program;
+        GLint uniform_transform;
+        GLint uniform_pixel_size;
+        GLint uniform_padding_ratio;
+        GLint uniform_texture;
+        GLint uniform_color_matrix;
+        GLint uniform_row_length;
+        GLint uniform_inv_gamma;
+        GLint uniform_blacklevel;
+
+        GLuint quad;
+} GLES2Debayer;
 
 GLES2Debayer *gles2_debayer_new(int format);
 
@@ -13,12 +29,17 @@ void gles2_debayer_free(GLES2Debayer *self);
 void gles2_debayer_use(GLES2Debayer *self);
 
 void gles2_debayer_configure(GLES2Debayer *self,
-                             const uint32_t dst_width,
-                             const uint32_t dst_height,
-                             const uint32_t src_width,
-                             const uint32_t src_height,
-                             const uint32_t rotation,
-                             const bool mirrored,
+                             uint32_t dst_width,
+                             uint32_t dst_height,
+                             uint32_t src_width,
+                             uint32_t src_height,
+                             uint32_t rotation,
+                             bool mirrored,
                              struct MPCameraCalibration calibration);
 
+void gles2_debayer_set_shading(GLES2Debayer *self,
+                               float red,
+                               float blue,
+                               float blacklevel);
+
 void gles2_debayer_process(GLES2Debayer *self, GLuint dst_id, GLuint source_id);