OpenGL着色器语法写法注意

最新推荐文章于 2025-03-15 16:37:00 发布

原创最新推荐文章于 2025-03-15 16:37:00 发布 · 839 阅读

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#OpenGL #顶点着色器语法

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static const char *vert_str =
"precision mediump float;                                  \n"
"attribute vec3 g_vPosition;                                \n"
"uniform highp mat4 g_matModelView;            \n"
"uniform highp mat4 g_matProj;                        \n"
"uniform vec2 g_viscar;                                       \n"
"varying vec2 v_iscar;                                          \n"
"void main(){                                                        \n"
"   **vec3 g_vgragePosition = g_vPosition**;            \n" //假如需要对传入的顶点操作，不能直接对g_vPosition进行操作，需要定义一个新的变量对变量进行操作
"   if(sqrt(g_vgragePosition.x  + (g_vgragePosition.y - 6685.0) * g_vgragePosition.z) ) > 2.0*7154.0){                                                      \n" //常数的精度需要是浮点数，不能是整数
"    g_vgragePosition.x = 0.0;                               \n"
"    g_vgragePosition.y = 0.0;                               \n"
"    g_vgragePosition.z = 0.0;}                              \n"
" **vec4 vPostion = vec4(g_vgragePosition, 1.0);**   \n"

//" vec4 vPostion = vec4(g_vPosition, 1.0);          \n"

"   vec4 vPositionES = g_matModelView * vPostion; \n"
"   gl_Position  = g_matProj * vPositionES;          \n"
"   v_iscar = g_viscar;                                           \n"
"}                                                                         \n";