From 89bfd9d567ced945bf2f4b3a927426c1ad2ee762 Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@iki.fi>
Date: Fri, 2 Oct 2015 21:27:43 +0300
Subject: Add DumbFramebuffer

Move the current Framebuffer to DumbFramebuffer, and make a simple
Framebuffer as its super class.
---
 libkms++/dumbframebuffer.cpp | 167 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 167 insertions(+)
 create mode 100644 libkms++/dumbframebuffer.cpp

(limited to 'libkms++/dumbframebuffer.cpp')

diff --git a/libkms++/dumbframebuffer.cpp b/libkms++/dumbframebuffer.cpp
new file mode 100644
index 0000000..8e77604
--- /dev/null
+++ b/libkms++/dumbframebuffer.cpp
@@ -0,0 +1,167 @@
+
+#include <cstring>
+#include <stdexcept>
+#include <sys/mman.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+#include <drm_fourcc.h>
+#include <drm.h>
+#include <drm_mode.h>
+
+#include "kms++.h"
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+using namespace std;
+
+namespace kms
+{
+
+DumbFramebuffer::DumbFramebuffer(Card &card, uint32_t width, uint32_t height, const char* fourcc)
+	:Framebuffer(card, width, height)
+{
+	uint32_t a, b, c, d;
+	a = fourcc[0];
+	b = fourcc[1];
+	c = fourcc[2];
+	d = fourcc[3];
+
+	uint32_t code = ((uint32_t)(a) | ((uint32_t)(b) << 8) | ((uint32_t)(c) << 16) | ((uint32_t)(d) << 24));
+
+	Create(width, height, code);
+}
+
+DumbFramebuffer::~DumbFramebuffer()
+{
+	Destroy();
+}
+
+void DumbFramebuffer::print_short() const
+{
+	printf("DumbFramebuffer %d\n", id());
+}
+
+struct FormatPlaneInfo
+{
+	uint8_t bitspp;	/* bits per (macro) pixel */
+	uint8_t xsub;
+	uint8_t ysub;
+};
+
+struct FormatInfo
+{
+	uint32_t format;
+	uint8_t num_planes;
+	struct FormatPlaneInfo planes[4];
+};
+
+static const FormatInfo format_info_array[] = {
+	/* YUV packed */
+	{ DRM_FORMAT_UYVY, 1, { { 32, 2, 1 } }, },
+	{ DRM_FORMAT_YUYV, 1, { { 32, 2, 1 } }, },
+	/* YUV semi-planar */
+	{ DRM_FORMAT_NV12, 2, { { 8, 1, 1, }, { 16, 2, 2 } }, },
+	/* RGB16 */
+	{ DRM_FORMAT_RGB565, 1, { { 16, 1, 1 } }, },
+	/* RGB32 */
+	{ DRM_FORMAT_XRGB8888, 1, { { 32, 1, 1 } }, },
+};
+
+static const FormatInfo& find_format(uint32_t format)
+{
+	for (uint i = 0; i < ARRAY_SIZE(format_info_array); ++i) {
+		if (format == format_info_array[i].format)
+			return format_info_array[i];
+	}
+
+	throw std::invalid_argument("foo");
+}
+
+void DumbFramebuffer::Create(uint32_t width, uint32_t height, uint32_t format)
+{
+	int r;
+
+	m_format = format;
+
+	const FormatInfo& format_info = find_format(format);
+
+	m_num_planes = format_info.num_planes;
+
+	for (int i = 0; i < format_info.num_planes; ++i) {
+		const FormatPlaneInfo& pi = format_info.planes[i];
+		FramebufferPlane& plane = m_planes[i];
+
+		/* create dumb buffer */
+		struct drm_mode_create_dumb creq = drm_mode_create_dumb();
+		creq.width = width / pi.xsub;
+		creq.height = height / pi.ysub;
+		creq.bpp = pi.bitspp;
+		r = drmIoctl(card().fd(), DRM_IOCTL_MODE_CREATE_DUMB, &creq);
+		if (r)
+			throw std::invalid_argument("foo");
+
+		plane.handle = creq.handle;
+		plane.stride = creq.pitch;
+		plane.size = creq.height * creq.pitch;
+
+		/*
+		printf("buf %d: %dx%d, bitspp %d, stride %d, size %d\n",
+			i, creq.width, creq.height, pi->bitspp, plane->stride, plane->size);
+		*/
+
+		/* prepare buffer for memory mapping */
+		struct drm_mode_map_dumb mreq = drm_mode_map_dumb();
+		mreq.handle = plane.handle;
+		r = drmIoctl(card().fd(), DRM_IOCTL_MODE_MAP_DUMB, &mreq);
+		if (r)
+			throw std::invalid_argument("foo");
+
+		/* perform actual memory mapping */
+		m_planes[i].map = (uint8_t *)mmap(0, plane.size, PROT_READ | PROT_WRITE, MAP_SHARED,
+						  card().fd(), mreq.offset);
+		if (plane.map == MAP_FAILED)
+			throw std::invalid_argument("foo");
+
+		/* clear the framebuffer to 0 */
+		memset(plane.map, 0, plane.size);
+	}
+
+	/* create framebuffer object for the dumb-buffer */
+	uint32_t bo_handles[4] = { m_planes[0].handle, m_planes[1].handle };
+	uint32_t pitches[4] = { m_planes[0].stride, m_planes[1].stride };
+	uint32_t offsets[4] = { 0 };
+	uint32_t id;
+	r = drmModeAddFB2(card().fd(), width, height, format,
+			  bo_handles, pitches, offsets, &id, 0);
+	if (r)
+		throw std::invalid_argument("foo");
+
+	m_id = id;
+}
+
+void DumbFramebuffer::Destroy()
+{
+	/* delete framebuffer */
+	drmModeRmFB(card().fd(), id());
+
+	for (uint i = 0; i < m_num_planes; ++i) {
+		FramebufferPlane& plane = m_planes[i];
+
+		/* unmap buffer */
+		munmap(plane.map, plane.size);
+
+		/* delete dumb buffer */
+		struct drm_mode_destroy_dumb dreq = drm_mode_destroy_dumb();
+		dreq.handle = plane.handle;
+		drmIoctl(card().fd(), DRM_IOCTL_MODE_DESTROY_DUMB, &dreq);
+
+	}
+}
+
+void DumbFramebuffer::clear()
+{
+	for (unsigned i = 0; i < m_num_planes; ++i)
+		memset(m_planes[i].map, 0, m_planes[i].size);
+}
+
+}
-- 
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