vo_opengl: be explicit about IMG_RW

Both vulkan and opengl distinguish between rendering to an image and
using an image as a storage attachment. So make this an explicit
capability instead of lumping it in with render_dst. (That way we could
support, for example, using an image as a storage attachment without
requiring a framebuffer)

The real reason for this change is that you can directly use the output
FBO as a storage attachment on vulkan but you can't on opengl, which
makes this param structly separate from render_dst.

1 files changed, 2 insertions, 0 deletions

diff --git a/video/out/opengl/ra.h b/video/out/opengl/ra.h
index f2b41256db..f09fa6c861 100644
--- a/video/out/opengl/ra.h
+++ b/video/out/opengl/ra.h
@@ -90,6 +90,7 @@ struct ra_tex_params {
     const struct ra_format *format;
     bool render_src;        // must be useable as source texture in a shader
     bool render_dst;        // must be useable as target texture in a shader
+    bool storage_dst;       // must be usable as a storage image (RA_VARTYPE_IMG_W)
     bool blit_src;          // must be usable as a blit source
     bool blit_dst;          // must be usable as a blit destination
     bool host_mutable;      // texture may be updated with tex_upload
@@ -170,6 +171,7 @@ enum ra_vartype {
                                 // ra_tex.params.render_src must be true
     RA_VARTYPE_IMG_W,           // C: ra_tex*, GLSL: various image types
                                 // write-only (W) image for compute shaders
+                                // ra_tex.params.storage_dst must be true
     RA_VARTYPE_BYTE_UNORM,      // C: uint8_t, GLSL: int, vec* (vertex data only)
     RA_VARTYPE_BUF_RW,          // C: ra_buf*, GLSL: buffer block
 };