1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <stddef.h>
20 #include <stdint.h>
21 
22 #include <memory>
23 
24 #include <xf86drmMode.h>
25 
26 #include "graphics.h"
27 #include "minui/minui.h"
28 
29 class GRSurfaceDrm : public GRSurface {
30  public:
31   ~GRSurfaceDrm() override;
32 
33   // Creates a GRSurfaceDrm instance.
34   static std::unique_ptr<GRSurfaceDrm> Create(int drm_fd, int width, int height);
35 
data()36   uint8_t* data() override {
37     return mmapped_buffer_;
38   }
39 
40  private:
41   friend class MinuiBackendDrm;
42 
GRSurfaceDrm(size_t width,size_t height,size_t row_bytes,size_t pixel_bytes,int drm_fd,uint32_t handle)43   GRSurfaceDrm(size_t width, size_t height, size_t row_bytes, size_t pixel_bytes, int drm_fd,
44                uint32_t handle)
45       : GRSurface(width, height, row_bytes, pixel_bytes), drm_fd_(drm_fd), handle(handle) {}
46 
47   const int drm_fd_;
48 
49   uint32_t fb_id{ 0 };
50   uint32_t handle{ 0 };
51   uint8_t* mmapped_buffer_{ nullptr };
52 };
53 
54 class MinuiBackendDrm : public MinuiBackend {
55  public:
56   MinuiBackendDrm() = default;
57   ~MinuiBackendDrm() override;
58 
59   GRSurface* Init() override;
60   GRSurface* Flip() override;
61   void Blank(bool) override;
62 
63  private:
64   void DrmDisableCrtc(int drm_fd, drmModeCrtc* crtc);
65   bool DrmEnableCrtc(int drm_fd, drmModeCrtc* crtc, const std::unique_ptr<GRSurfaceDrm>& surface);
66   void DisableNonMainCrtcs(int fd, drmModeRes* resources, drmModeCrtc* main_crtc);
67   drmModeConnector* FindMainMonitor(int fd, drmModeRes* resources, uint32_t* mode_index);
68 
69   std::unique_ptr<GRSurfaceDrm> GRSurfaceDrms[2];
70   int current_buffer{ 0 };
71   drmModeCrtc* main_monitor_crtc{ nullptr };
72   drmModeConnector* main_monitor_connector{ nullptr };
73   int drm_fd{ -1 };
74 };
75