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103 lines
3.3 KiB
Markdown
103 lines
3.3 KiB
Markdown
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# linux-fb 如何使用 egl
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## 1.配置默认支持的 egl 平台
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在 linux-fb 中默认适配了三种平台的 egl，分别是飞思卡尔（fsl）平台和支持 x11 平台以及树莓派，如果是默认已经适配的平台，直接在 awtk_config.py 中开启相关的配置就可以使用，如下：
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```python
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# awtk_config.py
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# lcd devices
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LCD_DEVICES='fb'
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# LCD_DEVICES='drm'
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# LCD_DEVICES='egl_for_fsl'
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# LCD_DEVICES='egl_for_x11'
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# LCD_DEVICES='egl_for_rpi'
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```
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### 2.适配其他 egl 平台
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这里假设需要适配的平台名字为 AAA。
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1. 在 egl_devices 目录下创建 AAA/egl_devices.c 文件重载实现 liunx-fb 的 egl 接口（egl_devices.h 文件），egl 接口（egl_devices.h 文件）如下：
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```h
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/* egl_devices.h */
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#ifndef TK_EGL_DEVICES_H
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#define TK_EGL_DEVICES_H
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#include "base/types_def.h"
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BEGIN_C_DECLS
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void* egl_devices_create(const char* filename);
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ret_t egl_devices_dispose(void* ctx);
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float_t egl_devices_get_ratio(void* ctx);
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int32_t egl_devices_get_width(void* ctx);
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int32_t egl_devices_get_height(void* ctx);
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ret_t egl_devices_make_current(void* ctx);
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ret_t egl_devices_swap_buffers(void* ctx);
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END_C_DECLS
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#endif /*TK_EGL_DEVICES_H*/
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```
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2. 修改 SConscript 文件，加入对应平台的适配文件（AAA/egl_devices.c 文件），如下：
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```python
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# SConscript
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if LCD_DEVICES =='egl_for_fsl' :
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SOURCES = Glob('egl_devices/fsl/*.c') + SOURCES;
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elif LCD_DEVICES =='egl_for_x11' :
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SOURCES = Glob('egl_devices/x11/*.c') + SOURCES;
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elif LCD_DEVICES =='egl_for_rpi' :
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SOURCES = Glob('egl_devices/rpi/*.c') + SOURCES;
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elif LCD_DEVICES =='egl_for_AAA' : # 这里加入适配文件代码
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SOURCES = Glob('egl_devices/AAA/*.c') + SOURCES;
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```
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3. 在 awtk_config.py 加入编译选项，如下：
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```python
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# awtk_config.py
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...
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# lcd devices
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# LCD_DEVICES='fb'
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# LCD_DEVICES='drm'
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# LCD_DEVICES='egl_for_fsl'
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# LCD_DEVICES='egl_for_x11'
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# LCD_DEVICES='egl_for_rpi'
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LCD_DEVICES='egl_for_AAA' # 这里让 LCD_DEVICES 等于 egl_for_AAA，因为 SConscript 中需要 LCD_DEVICES 来确定编译文件。
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...
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if LCD_DEVICES =='drm' :
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#for drm
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OS_FLAGS=OS_FLAGS + ' -DWITH_LINUX_DRM=1 -I/usr/include/libdrm '
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OS_LIBS=OS_LIBS + ['drm']
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elif LCD_DEVICES =='egl_for_fsl':
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#for egl for fsl
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OS_FLAGS=OS_FLAGS + ' -DEGL_API_FB '
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OS_LIBS=OS_LIBS + [ 'GLESv2', 'EGL']
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elif LCD_DEVICES =='egl_for_x11' :
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#for egl for fsl
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OS_FLAGS=OS_FLAGS + ' -fPIC '
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OS_LIBS=OS_LIBS + [ 'X11', 'EGL', 'GLESv2' ]
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elif LCD_DEVICES =='egl_for_rpi' :
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#for egl for rpi
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OS_LIBPATH += ['/opt/vc/lib']
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OS_CPPPATH += ['/opt/vc/include']
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OS_LIBS=OS_LIBS + [ 'brcmEGL', 'brcmGLESv2', 'bcm_host' ]
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COMMON_CCFLAGS += ' -DWITH_GLAD_SPECIAL_OPENGL_LIB=\\\"\"/opt/vc/lib/libbrcmGLESv2.so\\\"\" '
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elif LCD_DEVICES =='egl_for_AAA':
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# 这里添加链接相关的宏和链接类库以及头文件路径。
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# OS_FLAGS, OS_LIBPATH, OS_LIBS, COMMON_CCFLAGS
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```
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> 其中 WITH_GLAD_SPECIAL_OPENGL_LIB 宏是定义特殊链接的 egl 类库，提供给 glad 获取 OpenGLES 的相关函数使用的，如果调用默认的 libGLESv2.so 的话，则可以不需要设置，如 egl_for_x11 和 egl_for_fsl。
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