27 lines
1.2 KiB
Bash
27 lines
1.2 KiB
Bash
uniform mat4 uMVPMatrix; //总变换矩阵
|
|
uniform float uStartAngle;//本帧起始角度
|
|
uniform float uWidthSpan;//横向长度总跨度
|
|
attribute vec3 aPosition; //顶点位置
|
|
attribute vec2 aTexCoor; //顶点纹理坐标
|
|
varying vec2 vTextureCoord; //用于传递给片元着色器的变量
|
|
void main()
|
|
{
|
|
//计算X向角度
|
|
float angleSpanH=4.0*3.14159265;//横向角度总跨度
|
|
float startX=-uWidthSpan/2.0;//起始X坐标
|
|
//根据横向角度总跨度、横向长度总跨度及当前点X坐标折算出当前点X坐标对应的角度
|
|
float currAngleH=uStartAngle+((aPosition.x-startX)/uWidthSpan)*angleSpanH;
|
|
|
|
//计算出随Y向发展起始角度的扰动值
|
|
float angleSpanZ=4.0*3.14159265;//纵向角度总跨度
|
|
float uHeightSpan=0.75*uWidthSpan;//纵向长度总跨度
|
|
float startY=-uHeightSpan/2.0;//起始Y坐标
|
|
//根据纵向角度总跨度、纵向长度总跨度及当前点Y坐标折算出当前点Y坐标对应的角度
|
|
float currAngleZ=((aPosition.y-startY)/uHeightSpan)*angleSpanZ;
|
|
|
|
//计算斜向波浪
|
|
float tzH=sin(currAngleH-currAngleZ)*0.1;
|
|
//根据总变换矩阵计算此次绘制此顶点位置
|
|
gl_Position = uMVPMatrix * vec4(aPosition.x,aPosition.y,tzH,1);
|
|
vTextureCoord = aTexCoor;//将接收的纹理坐标传递给片元着色器
|
|
} |