Allow making extframebuffer and dmabufframebuffer with modifiers

Many GPUs use bandwidth compression or tiling, and this information
must be passed along to KMS when constructing the framebuffer object
around the GEM handle or prime filedescriptor.

Add an vector of modifiers as an optional parameter to both of these
classes.

Bump the minimum required version of libdrm to 2.4.17 to ensure
drmModeAddFB2WithModifiers() is available.

Signed-off-by: Matt Hoosier <matt.hoosier@garmin.com>

4 files changed, 32 insertions, 9 deletions

diff --git a/kms++/inc/kms++/dmabufframebuffer.h b/kms++/inc/kms++/dmabufframebuffer.h
index 2a9182d..a17b1f1 100644
--- a/kms++/inc/kms++/dmabufframebuffer.h
+++ b/kms++/inc/kms++/dmabufframebuffer.h
@@ -11,7 +11,7 @@ class DmabufFramebuffer : public Framebuffer
 {
 public:
 	DmabufFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format,
-			  std::vector<int> fds, std::vector<uint32_t> pitches, std::vector<uint32_t> offsets);
+			  std::vector<int> fds, std::vector<uint32_t> pitches, std::vector<uint32_t> offsets, std::vector<uint64_t> modifiers = {});
 	~DmabufFramebuffer() override;
 
 	uint32_t width() const override { return Framebuffer::width(); }
@@ -37,6 +37,7 @@ private:
 		uint32_t size;
 		uint32_t stride;
 		uint32_t offset;
+		uint64_t modifier;
 		uint8_t *map;
 	};
 
diff --git a/kms++/inc/kms++/extframebuffer.h b/kms++/inc/kms++/extframebuffer.h
index 5239a3d..f906fb2 100644
--- a/kms++/inc/kms++/extframebuffer.h
+++ b/kms++/inc/kms++/extframebuffer.h
@@ -11,7 +11,7 @@ class ExtFramebuffer : public Framebuffer
 {
 public:
 	ExtFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format,
-		       std::vector<uint32_t> handles, std::vector<uint32_t> pitches, std::vector<uint32_t> offsets);
+		       std::vector<uint32_t> handles, std::vector<uint32_t> pitches, std::vector<uint32_t> offsets, std::vector<uint64_t> modifiers = {});
 	~ExtFramebuffer() override;
 
 	uint32_t width() const override { return Framebuffer::width(); }
@@ -31,6 +31,7 @@ private:
 		uint32_t size;
 		uint32_t stride;
 		uint32_t offset;
+		uint64_t modifier;
 		uint8_t *map;
 	};
 
diff --git a/kms++/src/dmabufframebuffer.cpp b/kms++/src/dmabufframebuffer.cpp
index d36eb89..1e8c914 100644
--- a/kms++/src/dmabufframebuffer.cpp
+++ b/kms++/src/dmabufframebuffer.cpp
@@ -17,7 +17,7 @@ namespace kms
 {
 
 DmabufFramebuffer::DmabufFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format,
-				     vector<int> fds, vector<uint32_t> pitches, vector<uint32_t> offsets)
+				     vector<int> fds, vector<uint32_t> pitches, vector<uint32_t> offsets, vector<uint64_t> modifiers)
 	: Framebuffer(card, width, height)
 {
 	int r;
@@ -42,6 +42,7 @@ DmabufFramebuffer::DmabufFramebuffer(Card& card, uint32_t width, uint32_t height
 
 		plane.stride = pitches[i];
 		plane.offset = offsets[i];
+		plane.modifier = modifiers.empty() ? 0 : modifiers[i];
 		plane.size = plane.stride * height;
 		plane.map = 0;
 	}
@@ -50,10 +51,20 @@ DmabufFramebuffer::DmabufFramebuffer(Card& card, uint32_t width, uint32_t height
 	uint32_t bo_handles[4] = { m_planes[0].handle, m_planes[1].handle, m_planes[2].handle, m_planes[3].handle };
 	pitches.resize(4);
 	offsets.resize(4);
-	r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format,
-			  bo_handles, pitches.data(), offsets.data(), &id, 0);
-	if (r)
-		throw invalid_argument(string("drmModeAddFB2 failed: ") + strerror(errno));
+
+	if (modifiers.empty()) {
+		r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format,
+				  bo_handles, pitches.data(), offsets.data(), &id, 0);
+		if (r)
+			throw invalid_argument(string("drmModeAddFB2 failed: ") + strerror(errno));
+	}
+	else {
+		modifiers.resize(4);
+		r = drmModeAddFB2WithModifiers(card.fd(), width, height, (uint32_t)format,
+					       bo_handles, pitches.data(), offsets.data(), modifiers.data(), &id, DRM_MODE_FB_MODIFIERS);
+		if (r)
+			throw invalid_argument(string("drmModeAddFB2WithModifiers failed: ") + strerror(errno));
+	}
 
 	set_id(id);
 }
diff --git a/kms++/src/extframebuffer.cpp b/kms++/src/extframebuffer.cpp
index 23aed50..4ea563c 100644
--- a/kms++/src/extframebuffer.cpp
+++ b/kms++/src/extframebuffer.cpp
@@ -15,7 +15,7 @@ namespace kms
 {
 
 ExtFramebuffer::ExtFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format,
-			       vector<uint32_t> handles, vector<uint32_t> pitches, vector<uint32_t> offsets)
+			       vector<uint32_t> handles, vector<uint32_t> pitches, vector<uint32_t> offsets, vector<uint64_t> modifiers)
 	: Framebuffer(card, width, height)
 {
 	m_format = format;
@@ -33,6 +33,7 @@ ExtFramebuffer::ExtFramebuffer(Card& card, uint32_t width, uint32_t height, Pixe
 		plane.handle = handles[i];
 		plane.stride = pitches[i];
 		plane.offset = offsets[i];
+		plane.modifier = modifiers.empty() ? 0 : modifiers[i];
 		plane.size = plane.stride * height;
 		plane.map = 0;
 	}
@@ -41,7 +42,16 @@ ExtFramebuffer::ExtFramebuffer(Card& card, uint32_t width, uint32_t height, Pixe
 	handles.resize(4);
 	pitches.resize(4);
 	offsets.resize(4);
-	int r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format, handles.data(), pitches.data(), offsets.data(), &id, 0);
+	int r;
+
+	if (modifiers.empty()) {
+		r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format, handles.data(), pitches.data(), offsets.data(), &id, 0);
+	}
+	else {
+		modifiers.resize(4);
+		r = drmModeAddFB2WithModifiers(card.fd(), width, height, (uint32_t)format, handles.data(), pitches.data(), offsets.data(), modifiers.data(), &id, DRM_MODE_FB_MODIFIERS);
+	}
+
 	if (r)
 		throw std::invalid_argument(string("Failed to create ExtFramebuffer: ") + strerror(r));