https://learnopengl-cn.github.io/
https://github.com/parallel101/opengltutor
https://github.com/ocornut/imgui
https://github.com/yocover/start-learning-opengl
检查 CMakeLists.txt 中的ASSIMP_BUILD_ZLIB
选项是否开启, ON
mkdir build && cd build
cmake ..
make -j9
获取 libassimp.a 和 libzlibstatic.a
target_link_libraries(main PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/lib/libassimp.a)
target_link_libraries(main PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/lib/libzlibstatic.a)
OpenGL仅当3D坐标在3个轴(x、y和z)上-1.0到1.0的范围内时才处理它。 所有在这个范围内的坐标叫做标准化设备坐标,此范围内的坐标最终显示在屏幕上。
一旦你的顶点坐标已经在顶点着色器中处理过,它们就应该是标准化设备坐标了, 标准化设备坐标是一个x、y和z值在-1.0到1.0的一小段空间。任何落在范围外的坐标都会被丢弃/裁剪,不会显示在你的屏幕上。
libfreetype.a 依赖于以下库
-
Brotli 库
sudo apt-get install libbrotli-dev
-
libpng 库
sudo apt-get install libpng-dev
-
zlib 库
sudo apt-get install zlib1g-dev
-
HarfBuzz 库
sudo apt-get install libharfbuzz-dev
aux_source_directory(./imgui DIR_SRCS)
aux_source_directory(./examples/text_rendering DIR_SRCS)
add_executable (text_rendering ${DIR_SRCS})
target_link_libraries(text_rendering PUBLIC glm)
target_link_libraries(text_rendering PUBLIC glfw)
target_link_libraries(text_rendering PUBLIC glad)
target_link_libraries(text_rendering PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/lib/libfreetype.a)
target_link_libraries(text_rendering PUBLIC brotlidec)
target_link_libraries(text_rendering PUBLIC png)
target_link_libraries(text_rendering PUBLIC z)
target_link_libraries(text_rendering PUBLIC harfbuzz)
float rotate = glfwGetTime() * 0.2f;
glm::qua<float> qu = glm::qua<float>(glm::vec3(rotate, rotate, rotate));
model = glm::mat4_cast(qu);
开启模板缓冲
glEnable(GL_STENCIL_TEST);
清除模板缓冲
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
模板掩码
glStencilMask(0xFF); // 每一位写入模板缓冲时都保持原样
glStencilMask(0x00); // 每一位在写入模板缓冲时都会变成0(禁用写入)
模板函数
glStencilFunc(GLenum func, GLint ref, GLuint mask)
glStencilOp(GLenum sfail, GLenum dpfail, GLenum dppass)