vo_opengl: move self-contained shader routines to a separate file

This is mostly to cut down somewhat on the amount of code bloat in
video.c by moving out helper functions (including scaler kernels and
color management routines) to a separate file.

It would certainly be possible to move out more functions (eg. dithering
or CMS code) with some extra effort/refactoring, but this is a start.

Signed-off-by: wm4 <wm4@nowhere>

1 files changed, 25 insertions, 0 deletions

diff --git a/video/out/opengl/video.h b/video/out/opengl/video.h
index a52f35c424..65fdb6c3ab 100644
--- a/video/out/opengl/video.h
+++ b/video/out/opengl/video.h
@@ -22,6 +22,16 @@
 #include "options/m_option.h"
 #include "sub/osd.h"
 #include "common.h"
+#include "utils.h"
+#include "video/out/filter_kernels.h"
+
+// Texture units 0-5 are used by the video, and for free use by the passes
+#define TEXUNIT_VIDEO_NUM 6
+
+// Other texture units are reserved for specific purposes
+#define TEXUNIT_SCALERS  TEXUNIT_VIDEO_NUM
+#define TEXUNIT_3DLUT    (TEXUNIT_SCALERS+4)
+#define TEXUNIT_DITHER   (TEXUNIT_3DLUT+1)
 
 struct lut3d {
     uint16_t *data;
@@ -42,6 +52,21 @@ struct scaler_config {
     int clamp;
 };
 
+struct scaler {
+    int index;
+    struct scaler_config conf;
+    double scale_factor;
+    bool initialized;
+    struct filter_kernel *kernel;
+    GLuint gl_lut;
+    GLenum gl_target;
+    struct fbotex sep_fbo;
+    bool insufficient;
+
+    // kernel points here
+    struct filter_kernel kernel_storage;
+};
+
 struct gl_video_opts {
     int dumb_mode;
     struct scaler_config scaler[4];