egl: add initial EGL_MESA_image_dma_buf_export v2.4

At the moment to get an EGL image to a dma-buf file descriptor,
you have to use EGL_MESA_drm_image, and then use libdrm to
convert this to a file descriptor.

This extension just provides an API modelled on EGL_MESA_drm_image,
to return a dma-buf file descriptor.

v2: update spec for new API proposal
add internal queries to get the fourcc back from intel driver.

v2.1: add gallium pieces.

v2.2: add offsets to spec and API, rename fd->fds, stride->strides
in API. rewrite spec a bit more, add some q/a

v2.3:
add modifiers to query interface and 64-bit type for that (Daniel Stone)
specifiy what happens to num fds vs num planes differences. (Chad Versace)

v2.4:
fix grammar (Daniel Stone)

Signed-off-by: Dave Airlie <[email protected]>

4 files changed, 67 insertions, 0 deletions

diff --git a/src/egl/main/eglapi.c b/src/egl/main/eglapi.c
index 6031a7ad8dc..ea2ee734a21 100644
--- a/src/egl/main/eglapi.c
+++ b/src/egl/main/eglapi.c
@@ -423,6 +423,8 @@ _eglCreateExtensionsString(_EGLDisplay *dpy)
    _EGL_CHECK_EXTENSION(EXT_image_dma_buf_import);
 
    _EGL_CHECK_EXTENSION(NV_post_sub_buffer);
+
+   _EGL_CHECK_EXTENSION(MESA_image_dma_buf_export);
 #undef _EGL_CHECK_EXTENSION
 }
 
@@ -1239,6 +1241,10 @@ eglGetProcAddress(const char *procname)
       { "eglCreatePlatformWindowSurfaceEXT", (_EGLProc) eglCreatePlatformWindowSurfaceEXT },
       { "eglCreatePlatformPixmapSurfaceEXT", (_EGLProc) eglCreatePlatformPixmapSurfaceEXT },
       { "eglGetSyncValuesCHROMIUM", (_EGLProc) eglGetSyncValuesCHROMIUM },
+#ifdef EGL_MESA_drm_buf_image_export
+      { "eglExportDMABUFImageQueryMESA", (_EGLProc) eglExportDMABUFImageQueryMESA },
+      { "eglExportDMABUFImageMESA", (_EGLProc) eglExportDMABUFImageMESA },
+#endif
       { NULL, NULL }
    };
    EGLint i;
@@ -1926,3 +1932,47 @@ eglGetSyncValuesCHROMIUM(EGLDisplay display, EGLSurface surface,
 
    RETURN_EGL_EVAL(disp, ret);
 }
+
+#ifdef EGL_MESA_image_dma_buf_export
+EGLBoolean EGLAPIENTRY
+eglExportDMABUFImageQueryMESA(EGLDisplay dpy, EGLImageKHR image,
+                              EGLint *fourcc, EGLint *nplanes,
+                              EGLuint64MESA *modifiers)
+{
+   _EGLDisplay *disp = _eglLockDisplay(dpy);
+   _EGLImage *img = _eglLookupImage(image, disp);
+   _EGLDriver *drv;
+   EGLBoolean ret;
+
+   _EGL_CHECK_DISPLAY(disp, EGL_FALSE, drv);
+   assert(disp->Extensions.MESA_image_dma_buf_export);
+
+   if (!img)
+      RETURN_EGL_ERROR(disp, EGL_BAD_PARAMETER, EGL_FALSE);
+
+   ret = drv->API.ExportDMABUFImageQueryMESA(drv, disp, img, fourcc, nplanes,
+                                             modifiers);
+
+   RETURN_EGL_EVAL(disp, ret);
+}
+
+EGLBoolean EGLAPIENTRY
+eglExportDMABUFImageMESA(EGLDisplay dpy, EGLImageKHR image,
+                         int *fds, EGLint *strides, EGLint *offsets)
+{
+   _EGLDisplay *disp = _eglLockDisplay(dpy);
+   _EGLImage *img = _eglLookupImage(image, disp);
+   _EGLDriver *drv;
+   EGLBoolean ret;
+
+   _EGL_CHECK_DISPLAY(disp, EGL_FALSE, drv);
+   assert(disp->Extensions.MESA_image_dma_buf_export);
+
+   if (!img)
+      RETURN_EGL_ERROR(disp, EGL_BAD_PARAMETER, EGL_FALSE);
+
+   ret = drv->API.ExportDMABUFImageMESA(drv, disp, img, fds, strides, offsets);
+
+   RETURN_EGL_EVAL(disp, ret);
+}
+#endif
diff --git a/src/egl/main/eglapi.h b/src/egl/main/eglapi.h
index 0626719ae70..eb5f58e6fa9 100644
--- a/src/egl/main/eglapi.h
+++ b/src/egl/main/eglapi.h
@@ -140,6 +140,11 @@ typedef EGLBoolean (*SwapBuffersWithDamageEXT_t) (_EGLDriver *drv, _EGLDisplay *
 
 typedef EGLBoolean (*GetSyncValuesCHROMIUM_t) (_EGLDisplay *dpy, _EGLSurface *surface, EGLuint64KHR *ust, EGLuint64KHR *msc, EGLuint64KHR *sbc);
 
+#ifdef EGL_MESA_image_dma_buf_export
+typedef EGLBoolean (*ExportDMABUFImageQueryMESA_t)(_EGLDriver *drv, _EGLDisplay *disp, _EGLImage *img, EGLint *fourcc, EGLint *stride, EGLuint64MESA *modifiers);
+typedef EGLBoolean (*ExportDMABUFImageMESA_t)(_EGLDriver *drv, _EGLDisplay *disp, _EGLImage *img, EGLint *fds, EGLint *strides, EGLint *offsets);
+#endif
+
 /**
  * The API dispatcher jumps through these functions
  */
@@ -226,6 +231,11 @@ struct _egl_api
 
    QueryBufferAge_t QueryBufferAge;
    GetSyncValuesCHROMIUM_t GetSyncValuesCHROMIUM;
+
+#ifdef EGL_MESA_image_dma_buf_export
+   ExportDMABUFImageQueryMESA_t ExportDMABUFImageQueryMESA;
+   ExportDMABUFImageMESA_t ExportDMABUFImageMESA;
+#endif
 };
 
 #endif /* EGLAPI_INCLUDED */
diff --git a/src/egl/main/egldisplay.h b/src/egl/main/egldisplay.h
index d7f5dbacde6..4a1fb4ab15c 100644
--- a/src/egl/main/egldisplay.h
+++ b/src/egl/main/egldisplay.h
@@ -123,6 +123,8 @@ struct _egl_extensions
    EGLBoolean EXT_buffer_age;
    EGLBoolean EXT_swap_buffers_with_damage;
    EGLBoolean EXT_image_dma_buf_import;
+
+   EGLBoolean MESA_image_dma_buf_export;
 };
 
 
diff --git a/src/egl/main/eglfallbacks.c b/src/egl/main/eglfallbacks.c
index be596430684..c108ca7687c 100644
--- a/src/egl/main/eglfallbacks.c
+++ b/src/egl/main/eglfallbacks.c
@@ -118,4 +118,9 @@ _eglInitDriverFallbacks(_EGLDriver *drv)
 #ifdef EGL_NOK_swap_region
    drv->API.SwapBuffersRegionNOK = NULL;
 #endif
+
+#ifdef EGL_MESA_dma_buf_image_export
+   drv->API.ExportDMABUFImageQueryMESA = NULL;
+   drv->API.ExportDMABUFImageMESA = NULL;
+#endif
 }