vo_opengl: make compute shaders more flexible

This allows users to do their own custom sample writing, mainly meant to
address use cases such as RAVU. Also clean up the compute shader code a
bit.

1 files changed, 8 insertions, 2 deletions

diff --git a/video/out/opengl/user_shaders.h b/video/out/opengl/user_shaders.h
index 888422608c..5f3f1d0d93 100644
--- a/video/out/opengl/user_shaders.h
+++ b/video/out/opengl/user_shaders.h
@@ -55,6 +55,13 @@ struct szexp {
     } val;
 };
 
+struct compute_info {
+    bool active;
+    int block_w, block_h;     // Block size (each block corresponds to one WG)
+    int threads_w, threads_h; // How many threads form a working group
+    bool directly_writes;     // If true, shader is assumed to imageStore(out_image)
+};
+
 struct gl_user_shader_hook {
     struct bstr pass_desc;
     struct bstr hook_tex[SHADER_MAX_HOOKS];
@@ -66,8 +73,7 @@ struct gl_user_shader_hook {
     struct szexp height[MAX_SZEXP_SIZE];
     struct szexp cond[MAX_SZEXP_SIZE];
     int components;
-    int compute_w;
-    int compute_h;
+    struct compute_info compute;
 };
 
 struct gl_user_shader_tex {