[Mesa-dev] [PATCH kmscube 5/6] common: Use libdrm AddFB with modifiers

[Ben Widawsky]

Note: nothing happens here yet since LINEAR == 0.
---
 configure.ac |  2 +-
 drm-common.c | 37 +++++++++++++++++++++++++++++++++----
 2 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index 33167e4..f564ef3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,7 +35,7 @@ AC_PROG_CC
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 # Obtain compiler/linker options for depedencies
-PKG_CHECK_MODULES(DRM, libdrm)
+PKG_CHECK_MODULES(DRM, [libdrm >= 2.4.71])
 PKG_CHECK_MODULES(GBM, gbm >= 13.0)
 PKG_CHECK_MODULES(EGL, egl)
 PKG_CHECK_MODULES(GLES2, glesv2)
diff --git a/drm-common.c b/drm-common.c
index b69ed70..eb460df 100644
--- a/drm-common.c
+++ b/drm-common.c
@@ -46,7 +46,7 @@ struct drm_fb * drm_fb_get_from_bo(struct gbm_bo *bo)
 {
        int drm_fd = gbm_device_get_fd(gbm_bo_get_device(bo));
        struct drm_fb *fb = gbm_bo_get_user_data(bo);
-       uint32_t width, height, stride, handle;
+       uint32_t width, height, strides[4]={0}, handles[4] = {0}, offsets[4] = 
{0}, flags = 0;
        int ret;
 
        if (fb)
@@ -57,10 +57,39 @@ struct drm_fb * drm_fb_get_from_bo(struct gbm_bo *bo)
 
        width = gbm_bo_get_width(bo);
        height = gbm_bo_get_height(bo);
-       stride = gbm_bo_get_stride(bo);
-       handle = gbm_bo_get_handle(bo).u32;
 
-       ret = drmModeAddFB(drm_fd, width, height, 24, 32, stride, handle, 
&fb->fb_id);
+#ifndef HAVE_GBM_MODIFIERS
+       strides[0] = gbm_bo_get_stride(bo);
+       handles[0] = gbm_bo_get_handle(bo).u32;
+       ret = -1;
+#else
+       uint64_t modifiers[4] = {0};
+       modifiers[0] = gbm_bo_get_modifier(bo);
+       const int num_planes = gbm_bo_get_plane_count(bo);
+       for (int i = 0; i < num_planes; i++) {
+               strides[i] = gbm_bo_get_stride_for_plane(bo, i);
+               handles[i] = gbm_bo_get_handle(bo).u32;
+               offsets[i] = gbm_bo_get_offset(bo, i);
+               modifiers[i] = modifiers[0];
+       }
+
+       if (modifiers[0]) {
+               flags = DRM_MODE_FB_MODIFIERS;
+               printf("Using modifier %lx\n", modifiers[0]);
+       }
+
+       ret = drmModeAddFB2WithModifiers(drm_fd, width, height,
+                       DRM_FORMAT_XRGB8888, handles, strides, offsets,
+                       modifiers, &fb->fb_id, flags);
+#endif
+       if (ret) {
+               if (flags)
+                       fprintf(stderr, "Modifiers failed!\n");
+               flags = 0;
+               ret = drmModeAddFB2(drm_fd, width, height, DRM_FORMAT_XRGB8888,
+                               handles, strides, offsets, &fb->fb_id, 0);
+       }
+
        if (ret) {
                printf("failed to create fb: %s\n", strerror(errno));
                free(fb);
-- 
2.12.2

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